API stands for Application Programming Interface, and it is an layer of interface that allows programs to interact with each other. An experienced API developer can build complex interactions between applications, making them faster, more reliable, and accurate. Whether you need a second opinion on your existing application or you want to create an entirely new application for your business, an expert API Developer can do the job for you.

An API Developer's job does not stop at developing. They can also work on design and implementation testing, guide through the entire architect process from prototyping to implementation, create custom system integration solution based on the project requirements, and collaborate with other teams to develop systems that meet customer expectations.

When hiring an API Developer through Freelancer.com, rest assured that they are as competent as any hired onsite software engineer.

Here’s some projects our experts have worked on:

  • Building custom interfaces to move large amounts of data efficiently between applications
  • Working with Javascript to allow websites to access external information relating to weather conditions
  • Creating Grafana dashboards for quick and easy visualization of data points
  • Developing scripts to connect external APIs with more heavy-duty platforms like Microsoft Azure
  • Debugging mobile apps involving fishing
  • Integrating AI capabilities into online shops
  • Automating regression tests so developers can work faster and more accurately

No matter what your business needs are in terms of API development, our expert freelancers are ready to take on the challenge and provide support whenever you need it. With expertise in debugging applications and web development, you're guaranteed to find the right developer for your project! So why wait? Post your project today at Freelancers.com and reap the benefits of working with an expert API Developer now!

From 184,833 reviews, clients rate our API Developers 4.85 out of 5 stars.
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    I am looking for a freelancer who can develop a Popclip extension for MacOS that will automatically create Anki cards. The extension should have basic functionality and should be compatible with MacOS. Requirements: - Develop a Popclip extension for MacOS - The extension should automatically create an Anki card with the selected text on the front side of the new card; the back side stays blank - The card should be created in a fixed, predefined deck Skills and Experience: - Experience in MacOS development - Experience in developing Popclip extensions - Knowledge of the Popclip app - Knowledge of the macOS version of the latest Anki app - Familiarity with Anki card creation process via the AnkiConnect

    $13 (Avg Bid)
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    Small Python script 6 days left
    VERIFIED

    I am looking for a freelancer who can create a small Python script that focuses on talking to a private API. I need someone with experience in this area who can complete the project as soon as possible. Specific requirements for the project include: - Creating a Python script that can talk to a well documented API - Utilizing a preferred Python library or framework (Python 3 or higher) - Ensuring the script is efficient and reliable Ideal skills and experience for this job include: - Proficiency in Python programming - Experience with automation and scripting - Knowledge of various Python libraries and frameworks If you have the necessary skills and can complete the project quickly, please submit your proposal. Your work will be a small script that will talk to Bitvavo's API an...

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    Objective: To create a user-friendly website application that enables users to buy followers for various social media platforms. The app should be API-driven for seamless integration and functionality. Key Features & Requirements: API Integration: The app must work seamlessly with various APIs to enable the buying of followers. This includes integration with social media platforms and payment gateways. Admin Control Panel: A robust admin dashboard to manage the application, including features to: Add, edit, or delete categories (e.g., Instagram followers, Twitter followers, etc.). Manage packages, set prices, and update them as needed. Oversee user activity and transactions. User Account Creation and Management: Users should be able to create accounts, log in, and manage their prof...

    $245 (Avg Bid)
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    I am looking for a freelancer who can create a custom workflow action for my existing gohighlevel CRM. The specific action I need is to create appointments in the gohighlevel calendar. Ideal Skills and Experience: - Proficient in gohighlevel and its features - Familiarity with gohighlevel calendar functionality

    $20 (Avg Bid)
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    Help with CBR API 6 days left
    VERIFIED

    I want a developer who is VERY familiar with the Central Bank of Russia API to generate lists for all time series in each database at: For each database I need a 3 column list containing a). List of Symbols in each b). English description for each symbol c) full url's tro download historical data in XML for each symbol For example the database RUONIA ( URL: ) Has the columns: RUONIA % Transactions volume in the RUONIA, bln. rubles Number of transactions, units Number of the RUONIA participants who conducted transactions in the given day, units Minimum rate, % 25th percentile of rates, % 75th percentile of rates, % Maximum rate, % Status of calculation Date of publication The names above would be ...

    $74 (Avg Bid)
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    I am looking for a freelancer who can create a comprehensive workshop presentation and demonstration on AIOT (Artificial Intelligence of Things) technology in the two areas of the following; AI application area; Desired Outcome: - The primary goal of the workshop is to showcase the capabilities of AIOT technology to the participants. - The demonstration should provide a clear understanding of how AIOT technology works and its potential applications. Technical Knowledge Level: - The presentation and demonstration should be aimed at an advanced technical knowledge level. - The target audience should have a solid understanding of AIOT concepts and technologies. Focus: - The demonstration should primarily focus on Artificial Intelligence applications within the AIOT field. - Machine learnin...

    $116 (Avg Bid)
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    Project Description: Saudi Nphies CHI system integration We are seeking a skilled professional to integrate our current healthcare system with the Saudi Nphies CHI system. The ideal candidate should have experience in integrating third-party software with healthcare systems and be knowledgeable about the Saudi Nphies CHI system standards. Specific requirements for this project include: - Integration of patient records: We need to seamlessly integrate our current system with the Saudi Nphies CHI system to ensure accurate and efficient exchange of patient records. - Compliance with Saudi Nphies CHI system standards: We require assistance in ensuring our system meets the necessary standards set by the Saudi Nphies CHI system. Skills and experience required: - Strong knowledge and experie...

    $508 (Avg Bid)
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    I am looking for a developer to create an Amazon API affiliate product site with the following features: - Product comparison functionality - The ability for users to leave reviews and ratings The site should be built on the WordPress platform and needs to be completed in less than 1 month. Ideal skills and experience for this project include: - Proficiency in WordPress development - Experience with Amazon API integration - Knowledge of product comparison functionality Please provide examples of previous work that demonstrates your ability to create similar sites.

    $319 (Avg Bid)
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    19 bids

    I am looking for a freelancer to automate certain tasks and processes for my new clinic onboarding project. Specifically, I need assistance with the following tasks: - Providers Signup: I would like to automate the signup process for healthcare providers, making it more efficient and streamlined. Integration with Existing Systems: I already have specific systems in mind that I would like the automation to integrate with. This will ensure a seamless transition and compatibility with my current setup. Flexible Timeline: I am flexible with the timeline for the completion of this project. While it is not urgent, I would like it to be completed within a reasonable timeframe. Ideal Skills and Experience: - Experience with clinic onboarding and automation projects - Proficiency in integratin...

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    I am looking for a freelancer who is familiar with the Discogs API and can integrate and sync a few complete inventories to a new Shopify store. We don't want to use third party app like Disconnect or other... we want use free Discogs API all the time and everyday. The ideal candidate should have good and enough experience in creating Shopify stores and have a strong understanding of the Discogs API. Requirements: - Familiarity with the Discogs - Familiarity with the Discogs API - Full integration with the Discogs API - Ability to sync music records and cds inventories with the Shopify new store - Ability to import music records and cds inventories from excel/csv files with the Shopify new store Skills and experience: - Proficiency in using the Discogs API - Experience in creating a...

    $218 (Avg Bid)
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    Repetition in webhook 5 days left
    VERIFIED

    I am seeking a skilled and experienced webhook developer to assist with a recurring issue in my system. The problem involves receiving the same event multiple times, creating unnecessary duplicates.

    $21 / hr (Avg Bid)
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    54 bids

    I am looking for a freelancer who can create a custom workflow action for my existing gohighlevel CRM. The specific action I need is to create appointments in the gohighlevel calendar. Ideal Skills and Experience: - Proficient in gohighlevel and its features - Familiarity with gohighlevel calendar functionality

    $16 (Avg Bid)
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    3 bids

    I am looking for a MERN stack developer with frontend React design skills to join my team. Application template is already developed and requires additional functions/pages to complete the project. Specific MERN stack skills required: - React.js - API Frontend integration Experience: - SaaS Frontend experience is important Project completion timeframe: - Within a month Ideal skills and experience: - Strong knowledge and experience with MongoDB, , and React.js - Experience with frontend React design - Ability to work within a team and meet deadlines - Strong problem-solving skills and attention to detail If you have the necessary skills and experience and are able to complete the project within a month, please contact me with your portfolio and hourly rate. Thank you.

    $566 (Avg Bid)
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    Incorporate Generative AI in e-Learning - Desired Outcome: Personalize learning experiences - Current e-Learning platform: Moodle - Open for discussion on specific AI features or functionalities to incorporate We are looking for a skilled developer experienced in incorporating Generative AI in e-Learning to enhance our platform. Our goal is to personalize learning experiences for students, ensuring they receive tailored content and support. Requirements: - Expertise in working with Moodle, our current e-Learning platform - Strong understanding of Generative AI and its application in e-Learning - Ability to analyze and interpret student data to create personalized learning experiences - Experience in developing and integrating AI features such as chatbots, recommendation systems, and au...

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    Make / Integromat automation 5 days left
    VERIFIED

    I have data coming in from a Webhook, that I need to sync into an another software using its API.

    $12 / hr (Avg Bid)
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    23 bids

    We are looking for support to make use of Pabbly connect shopify orders to zoho books for invoice.

    $113 (Avg Bid)
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    4 bids

    I am looking for people experienced with using Zapier/Active Pieces to automate API integration tasks. Specific tasks that need to be automated include email automation, data syncing, and social media posting. I have a specific list of applications and platforms that need to be integrated with, and I will provide this list to the freelancer. Ideal skills and experience for this job include: - Proficiency with Zapier/Active Pieces - Strong API integration skills

    $23 / hr (Avg Bid)
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    I am looking for a freelancer with experience in the sports betting industry and with hands-on experience in working with Delasport. Have you utilized Delasport in any casino/gaming organization? Do you possess knowledge of the setup, use cases, and all aspects related to its services? If so, we encourage you to apply. Experience with their API system is also crucial. Thank you."

    $1272 (Avg Bid)
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    28 bids
    Ai development 4 days left
    VERIFIED

    Project Title: AI Development - Chatbot I am looking for an experienced AI developer to create a chatbot using specific datasets that I already have. Ideal Skills and Experience: - Strong background in AI development, specifically in chatbot creation - Proficiency in natural language processing and machine learning algorithms - Familiarity with the specific datasets provided for training the AI model The chatbot should have the following functionalities and features based on my clear vision: - Ability to understand and respond to user queries in a conversational manner - Integration with various messaging platforms for seamless communication - Personalization capabilities to tailor responses based on user preferences - Integration with external APIs for retrieving relevant information ...

    $509 (Avg Bid)
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    Build out api integration 4 days left
    VERIFIED

    Arbor Gold has an open API. I can provide you with API documentation from our reviews collection platform, which currently connects to hundreds of CRM’s. I want to connect our reviews collection platform to Arbor Gold for the purpose of collecting reviews.

    $1108 (Avg Bid)
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    105 bids

    I am looking for a freelancer who can help me discover the endpoints of an existing app. I need someone who is experienced in using tools like Wireshark or any other tool to extract the endpoints. App is called XCWeather, just the the End points: ???????? Requirements: - Proficiency in using tools like Wireshark or any other tool to analyze network traffic and extract endpoints - Familiarity with API endpoints and database endpoints - Ability to work with limited access to the application's source code Ideal Skills and Experience: - Experience in discovering and extracting API endpoints and database endpoints - Strong understanding of network traffic analysis - Ability to work with limited access to source code Expected Outcome: - Provide a comprehensive list of discovered endpoi...

    $149 (Avg Bid)
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    I am looking for a TrustArc and cookie consent management expert developer who can work on an existing system. The project has a timeline of 1-3 months. Skills and Experience: - Expertise in TrustArc implementation and cookie consent management - Experience in working on existing systems - Strong understanding of data privacy regulations and cookie consent requirements - Familiarity with TrustArc platform and its implementation process - Ability to customize and integrate cookie consent management solutions - Strong problem-solving and troubleshooting skills - Excellent communication and collaboration skills to work with the existing team

    $27 / hr (Avg Bid)
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    61 bids
    app development 4 days left
    VERIFIED

    I am looking for a developer to create an app for both iOS and Android platforms. The primary function of the app will be informational and transactional. While I have a good idea of the features I want included, I am open to the developer's suggestions. Ideal Skills and Experience: - Experience in app development for both iOS and Android platforms - Strong understanding of informational and transactional app design and functionality - Creative thinking and ability to suggest innovative features based on client's rough idea - Ability to collaborate and communicate effectively with the client to refine the app concept

    $15 - $25 / hr
    Sealed
    $15 - $25 / hr
    102 bids

    I am looking for someone with skills with the GDS amadeus, saber and travelport APIs, I want to create a search engine for flights and affiliation concepts

    $1383 (Avg Bid)
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    80 bids
    Google cloud developers 4 days left
    VERIFIED

    Google Cloud Developers - I am looking for experienced Google Cloud Developers who can provide assistance with specific Google Cloud services such as Compute Engine, App Engine, and BigQuery. - Whether you have an existing project on Google Cloud or are starting a new one, I am open to working with you. - The timeframe for completing the Google Cloud development work is flexible, allowing for efficient collaboration between the client and developer. - Ideal candidates for this project should have a strong understanding of Google Cloud services, including experience with Compute Engine, App Engine, and BigQuery. - Proficiency in programming languages such as Python, Java, or Node.js is required. - The ability to design, develop, and deploy scalable applications on Google Cloud platform is e...

    $564 (Avg Bid)
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    Our requirement is to acquire historical live roulette wheel spin data from casino sites that are partnered with Evolution Gaming software, you will see that each wheel has a 500 number spin history. We wish to acquire the following: 1. The last winning number and spin Identification when published by any roulette table for any wheel on any site that has live roulette wheels powered by Evolution Gaming, 2. It must be working 100% with no missing numbers or skipping numbers. the roulette numbers must be in 100% chronological order. 3. The data scraper must be working with no down time. Normally 30 minutes log out. The data scraper must be logged in at all times and collect data with no breaks or logging out issues Code must be tested 100% before payment is made. A video can be done to...

    $184 (Avg Bid)
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    We are looking for a custom API solution development and therefore looking for a developer team that is highly experienced on google cloud solutions. The required solution is currently not available by google (just as a single function but not as an integratable AI) and we would like to change that for personal developments. Type GOOGLEDEV if read.

    $7819 (Avg Bid)
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    55 bids

    I am looking for a Java developer with experience in wildfly 30 app development. The project requires specific functionality for user authentication. Skills and experience: - Strong knowledge of Java programming language - Experience with wildfly 30 app development - Proficiency in user authentication implementation The client requires ongoing maintenance after the initial development. The timeline for this project is urgent, with a deadline of 1-2 weeks.

    $71 (Avg Bid)
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    10 bids

    I am looking for people experienced with using Zapier/Active Pieces to automate API integration tasks. Specific tasks that need to be automated include email automation, data syncing, and social media posting. I have a specific list of applications and platforms that need to be integrated with, and I will provide this list to the freelancer. Ideal skills and experience for this job include: - Proficiency with Zapier/Active Pieces - Strong API integration skills

    $5 / hr (Avg Bid)
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    23 bids

    Project Title: CloudOneX Customization and Bug Fixing Description: We are seeking a skilled developer to customize and fix bugs in our CloudOneX platform. The ideal candidate should have experience in web development and be familiar with the CloudOneX system. Unfortunately we tried to communicate with the original developers on more than 1 case but support is none-existent, so we're looking for long-term developer relationship. Additional Information: - If you have experience with CloudOneX or similar cloud-based platforms, it would be highly advantageous. - We are open to suggestions for additional features or functionalities that could enhance the platform, and we are willing to discuss these further. If you are a detail-oriented developer with experience in customization and bug...

    $24 (Avg Bid)
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    10 bids

    Hello, We have an existing wallet app for individuals with card issuing, we want to change from Stirpe to Wise for both accounts and cards, and looking for a developer to integrate wise API into the existing system for providing individual accounts and card issuing. Please mention the exact and full quote and time frame in your bid to be considered. Bids with no confirmation would not be contacted, no time wasters please, if you plan to change pricing and deadline after discussing please don't bid. Thank you,

    $540 (Avg Bid)
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    I am looking for a freelancer who can create a Google Sheet for my Shopify store with live updation. Specific data to be tracked in the Google Sheet: - Inventory Requirements: - The Google Sheet needs to be updated in real time - The Google Sheet should be updated every day Ideal Skills and Experience: - Proficiency in Google Sheets and data management - Experience with Shopify and inventory tracking - Knowledge of real-time data updation Please provide examples of similar projects you have worked on in the past.

    $84 (Avg Bid)
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    I am looking for a skilled web developer to create a website and web application for financial trading. The purpose of this project is to integrate trading bots specifically for derivatives (F&O - futures and options) into the web application. Skills and experience required for this project include: - Proficiency in web development languages such as Python, React.js, etc - Proficiency in API is must - Experience with financial trading and knowledge of derivatives will be a plus - Ability to create a page for admin to customise and create the trading bots - Ability to create a telegram BOT for trade notifications - Experience in dashboard creation The level of customisation required for the trading bots is intermediate, as we want to provide users with the ability to subscribe to and...

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    The project should elaborate and save information on a database and it should have an external graphic interface with user access. Here's a video loom on it: Here are some relevant experiences: - Previous experience with ChatGPT APIs and Assistant APIs (OpenAI) - Good knowledge of frontend development, able to build a full UX alone (preferably Laravel) - Good knowledge of different database systems like Mysql, MongoDB, BigQuery, or Airtable - Previous experience working with API and/or automation (Zapier, Integromat) - Must be experienced with Javascript (for frontend and backend)

    $19 / hr (Avg Bid)
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    63 bids

    I am looking for a freelancer who can create a comprehensive workshop presentation and demonstration on AIOT (Artificial Intelligence of Things) technology in the two areas of the following; AI application area; Desired Outcome: - The primary goal of the workshop is to showcase the capabilities of AIOT technology to the participants. - The demonstration should provide a clear understanding of how AIOT technology works and its potential applications. Technical Knowledge Level: - The presentation and demonstration should be aimed at an advanced technical knowledge level. - The target audience should have a solid understanding of AIOT concepts and technologies. Focus: - The demonstration should primarily focus on Artificial Intelligence applications within the AIOT field. - Machine learnin...

    $513 (Avg Bid)
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    17 bids

    I am looking for a skilled developer to build a custom website with API integration. The main functionality of the website will be an online store. Preferred Website Platform: - Custom-built API Integration: - The client has a specific API in mind for the integration. Ideal Skills and Experience: - Strong experience in custom website development - Proficiency in API integration - Knowledge of e-commerce and online store functionality - Ability to work with the client's chosen API Additional Details: - The website will require integration with the supplier's catalog, inventory, shipping, and payment systems. - The developer should be able to implement a user-friendly and secure online store interface. - The website should be responsive and compatible with different devices. - ...

    $427 (Avg Bid)
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    Project Description: E-Service Development I am looking to develop a recommendation system for courses within a month. I have some ideas for specific features and functionalities, but I am open to suggestions. Ideal Skills and Experience: - Strong knowledge and experience in e-service development - Proficiency in developing recommendation systems - Familiarity with course management systems - Ability to understand and implement client requirements - Creative thinking and problem-solving skills - Excellent communication and collaboration abilities

    $117 (Avg Bid)
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    2 bids

    I am looking for a freelancer who can help me with live data gathering using a website API, and enveloping it into a simple user interface. Specific data to gather: - Live data on item prices API to be used: - Public API Programming language preference: - No preference Skills and experience needed for the job: - Proficiency in working with APIs - Strong programming skills in Python or JavaScript - Experience in data gathering and manipulation - Attention to detail and accuracy in data collection - Ability to work independently and meet deadlines

    $25 (Avg Bid)
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    Google app script expert needed for stock price and data for world wide countries. Basically we have done for few countries we need you to replicate for more different countries, each country will consists about 8 google sheet types and some types may have dozen or up to few hundreds google sheets. Then some of the data needs be transferred and stored to SQL and taken from SQL by API also. This is team work, you will be working with bunch of server guys and python guys. So you need to possess these abilities and criteria : 1. Able to make google sheets fast, make editor for the GS fast and send all of the Google sheets ownership to me. 2. Able to work on SQL and API. 3. Able to collaborate as a team. 4. Agile, fast delivery, and responsive 5. Integrity, Honesty, Independently initiative...

    $48 (Avg Bid)
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    This project is remote. You have to work on my system using Anydesk or a similar tool. You have to authenticate and authorize Ring Central and Keap APIs using Postman or any tool whichever is suitable for you. I have an account on Ring Central and Keap and I want to get data from these applications to build custom reports. You do have not to build reports. You have just worked with APIs. If you find fit for this project and can complete it in 2 days. Please submit your proposal. More details will be shared with the shortlisted candidates.

    $32 (Avg Bid)
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    Project Title: Download Eravana Details and Update to Google Sheet I am looking for a freelancer who can download Eravana details and update them to a Google sheet. Specific Details to Download and Update: - Contact Information - Product Details - Financial Data Access to Source Details: - Not sure if I have access to the source of the details that need to be downloaded Frequency of Google Sheet Updates: - The Google sheet needs to be updated every 15 minutes Ideal Skills and Experience: - Proficient in data entry and Google Sheets - Familiarity with Eravana details and data sources - Attention to detail and accuracy in data entry - Ability to work with frequent updates and meet deadlines

    $5 / hr (Avg Bid)
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    Shopify App for Shipment 16 hours left
    VERIFIED

    I am looking for a Shopify app developer to create a custom app for shipment. The app should have the following features: - Using Uber API - Tracking information: The app should allow customers to track their shipments easily. - This app will be on the shopify App Store - A way for a store to sign up for a monthly fee - To get paid when a customer checks out using our shipment option Effectively the app will need to be on the shopify store where someone can easily download it. Sign up to our service it will add us as an option for delivery. You can specify your time slot you would like the item delivered. It would use the Uber Direct API to facilitate the delivery. Tracking needs to work with the Uber Direct API Ideal skills and experience for the job: - Proficiency in Shopify app dev...

    $4006 (Avg Bid)
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    84 bids

    API Integration between HR-ON and Master Data System I am looking for a skilled developer who can help me integrate my HR-ON system with our Master Data System. The ideal candidate should have experience in API integration and be familiar with HR systems such as HR-ON. Specific Data Integration: - The main focus of this project is to integrate employee information between the HR-ON system and the Master Data System. This includes data such as employee details, contact information, and job roles. Real-time Data Synchronization: - The data synchronization between the two systems needs to be in real-time. Any changes made in the HR-ON system should be reflected immediately in the Master Data System. Skills and Experience: - Experience in API integration is a must, particularly wi...

    $1362 (Avg Bid)
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    General Overview: WEB APPLICATION DEVELOPMENT OPORTUNITY! We are looking for a skilled developer experienced with the following no code website application builders and platforms: - Flutterflow - Flutter - FireBase - Rowy - API connections to payment processors, CRM’s, etc. - Web hooks FOR A DETAILED SCOPE, PROPOSED SITEMAP, EXAMPLES AND INSTRUCTIONAL VIDEOS, PLEASE RESPOND TO THIS AD AND WE WILL SEND THESE TO YOU. PLEASE INCLUDE THE PHRASE “TIME IS OF THE ESSENCE “ IN YOUR RESPONCE SO WE WILL KNOW YOUR RESPONCE IS GENUINE AND NON-ROBOTIC Description our Service/Product: Our service helps contractors in the United States to complete certain requirements by allowing contractors to create advertisements. The advertisements are about construction projects that are req...

    $610 (Avg Bid)
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    Backend c# 10 hours left
    VERIFIED

    I need a backend developer proficient in c# for API integration. Also who can work remotely Functionality needed: - API integration with an existing API Data handling: - The API will be handling data other than personal user data or business analytics data. Skills and experience required: - Proficiency in c# - Experience with API integration

    $42 (Avg Bid)
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    Cerchiamo un esperto in WhatsApp API per sviluppare una soluzione che permetta la registrazione automatica dei nominativi in rubrica su WhatsApp Business. Richiesta esperienza nella programmazione e integrazione di sistemi. Requisiti: Esperienza con WhatsApp API e WhatsApp Business. Capacità di implementazione conforme alle normative sulla privacy. Offerta: Budget negoziabile. Durata del progetto: da definire. Candidatura: Inviare proposta e portfolio tramite la piattaforma.

    $589 (Avg Bid)
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    WordPress API Develoer 6 hours left
    VERIFIED

    Hi, I have a multivendor website developed using Dokan Plugin. I would like to integrate an API which connects another website for the vendors to upload product with a single admin control Only Experienced Candidates to post the bid Thanks

    $115 (Avg Bid)
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    29 bids

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