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 184,528 reviews, clients rate our API Developers 4.85 out of 5 stars.
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    28 jobs found, pricing in USD

    Looking to connect a SendPulse mailing list to Google Sheets without using a third service. Changes made to either would appear on the other. If this is something you can do, please start your message with jdfj and explain briefly how it can be done.

    $50 (Avg Bid)
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    I am looking for a freelancer to help me set up Chat GPT API to follow up with my leads via SMS using Twilio, to let them know about the real estate services I provide and get them to book appointments with me. Please don't place a bid before you watch my video

    $1287 (Avg Bid)
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    Bidders should be familiar with WHMCS, and ideally have previous experience building payment/gateway modules in WHMCS. Buyer must be able to speak good English. If you don't have WHMCS knowledge please or availability, please do not bid. We've wasted much time awarding the project to various freelancers who then say they aren't able to do the work. We have an existing tokenised payment gateway module. The module also allows customers to make payments, it also does repeat payments, however this has stopped working since updating WHMCS from WHMCS 7.x to 8.x, and nothing is being recorded in the gateway log or elsewhere, so we're unsure exactly what the issue is. Normal payments i.e. not repeat payments, are working ok. We'd also like to make some improvements sugg...

    $200 (Avg Bid)
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    I am seeking a talented blockchain developer with in-depth familiarity with Ethereum, for the creation of a Decentralized Application (DApp) primarily aimed at businesses. Key aspects of this project involve: - Extensive knowledge of Ethereum and its development architecture. - Wide experience in creating DApp on the Ethereum blockchain. - Understanding the specific needs of businesses related to blockchain applications. The developer should have a proven track record in designing, developing, and deploying DApps for business usage. Exceptional problem solving skills, coupled with strong programming abilities, would be essential to success in this role. A clear understanding of the latest blockchain trends in business will be highly beneficial.

    $96 (Avg Bid)
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    I am seeking an expert to automate the extraction of text from resumes uploaded to our board and populate the extracted data into a text column within the same item. This enhancement aims to make resume information easily searchable, improving our recruitment efficiency. Essential Skills: - Experience with API - Proficiency in document parsing API integration - Knowledge in automation tools (e.g., Zapier, Integromat) - Scripting skills in Python or JavaScript - Understanding of data privacy and security Deliverables: - Automated workflow for text extraction upon resume upload - Population of extracted text into a specified text column - Brief documentation on the setup and maintenance Ideal Candidate: Someone with a background in API integrations, particularly with and documen...

    $164 (Avg Bid)
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    I am in need of a highly skilled AI developer to automate content creation on my WordPress site and various social media platforms. The goal is to develop an AI solution that can: - Generate engaging Articles, text, video (with subtitles and voiceovers), and image content. - Perform automatic content posting (with editing option before distribution) My objective it to: 1. Create a blog Article/post on my site though: A list of articles names, Category, keywords, Meta description (Excel sheet). The article will consist of a 900 -1300 words, and will include: introduction, content, bullet points, quotes, and any SEO tricks to make it more appalling to google search engine, Including research and publications sources links. (we will add Images to the article ourselves) ✔Check point 1 :...

    $2465 (Avg Bid)
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    simple API provider that offers no-code solutions for data integration to avoid backend work. These providers offer a user-friendly interface and pre-built connectors for various data sources, including Google Analytics 4, Search Console, and social media platforms. Here are a couple of options: • NoCodeAPI: Offers connectors for Google Sheets, Airtable, Google Analytics, Twitter, and more, allowing you to manage APIs without any backend code • Apipheny: Provides a list of free APIs for testing and an API integrator for Google Sheets, which can be useful for connecting different data sources without the need for backend development These services simplify the process of integrating various data sources into your application, making it accessible even for those with limited c...

    $275 (Avg Bid)
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    Project Description: We are seeking a skilled developer to assist in deploying and testing a Python script on Google Colab that automates the translation of text files from English to Chinese. The script will need to handle multiple text files organized within different folders, translating each file's contents and saving the translated versions in corresponding folders while maintaining the original directory structure. Key Project Requirements: Script Development: Develop a Python script that can: Upload multiple English text files (.txt format) organized in different folders to Google Colab. Translate the content of each text file from English to Chinese using the OpenAI API. Save the translated text files in their corresponding folders with the same directory structure as the ...

    $22 / hr (Avg Bid)
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    Be able to prove current experience in this platform. Help set up: - Bots - Calendar - Social Media - Pipeline - WhatsApp to say business name, not the telephone provider's name - Activating the sub accounts - And more similar More...

    $23 / hr (Avg Bid)
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    1. Who we are? We are building a new crypto hedge fund. We have already live trading strategies with a functioning back-end we built from scratch. You would be working alongside London-based hedge fund managers and under the supervision of a senior Python developer. 2. What are we offering? We are aiming to recruit a hard-working Python developer who is open to a full-time offer at a later stage. We are willing to increase substantially the salary later on with a potential bonus/equity that could multiply the base salary if the person and the strategies performs well. This means we could aim to multiply what you would be earning at the beginning. 3. What are we looking for? A Python developer who has experience working with Pandas and Numpy ideally. You will be assisting across ...

    $7 / hr (Avg Bid)
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    i am seeking an experienced XML developer to assist in integrating an X20 device equipped with encoder, decoder, and IP switch cards into our Network Monitoring System (NMS). The project entails optimizing real-time data retrieval from the device using XML API or protocol. Key Responsibilities: - Enhance XML parsing, processing, validation, and transformation capabilities for seamless integration. - Identify and rectify missing XML API code for the IP switch component. - Ensure accurate and consistent data retrieval from all three cards of the X20 device. - Collaborate with our team to refine XML processes and enhance the performance of our web application. Requirements: - Proficiency in XML parsing, processing, validation, and transformation. - Experience in integrating devices into N...

    $115 (Avg Bid)
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    I need a capable team to create a customisable workwear eCommerce site, similar in function to This site will primarily serve those in need of customised workwear or personalised product options, but should be universally appealing. Key Features: - Seamless API integration for real-time inventory tracking, keeping customers informed about availability - API should handle changes in product details for accurate and current descriptions - The system should automatically update the site with new products from the supplier’s feed Ideal Skills and Experience: - Proven experience with eCommerce site development, with a portfolio of attractive, user-friendly platforms. - Strong understanding of API integration, specifically relating to inventory management. - Experience developing and...

    $913 (Avg Bid)
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    Listing of New Companies profile which data taken from Ministry of Corporate Affairs MCA GST, PAN, and Other Govt Certificate search data directly taken from respective departments SCOPE OF WORK for Freelancer To enhance the visitors in website , consider the following scope of work: 1. Collection of API from Respective department: To reach our milestone our first job is collection data from various department like, • Ministry of Corporate Affairs [Register Companies data collection] • Goods and Service Tax [GST Register Companies data collection] • Income Tax [PAN Information Search] • Just Dial [All new business listing data collection] • Any other govt sites [all other available database collection] 2. Control Panel for Data Validation and edi...

    $1346 (Avg Bid)
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    I'm looking for a skilled and detailed-oriented R Shiny expert who can build a clean, user-friendly dashboard, connecting with multiple APIs. Your responsibility will include: • Connection to APIs, retrieving precise data regarding pollutant levels, historical data, specific date and time, sources of data and sensor locations from said APIs • Organizing these datasets into a neat and compelling layout within an R Shiny Dashboard application. • Extracting data and visualize it on the R Shiny dashboard You should have experience with charting libraries. Prerequisite Skills: • Significant experience working with R Shiny and API integration. • Competent in data visualization, comfortable handling line charts. I look forward to seeing your proposals and pas...

    $130 (Avg Bid)
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    I am on the lookout for proficient freelancers that are experienced in interacting with and troubleshooting Clover's PHP API. My main issue is that I'm finding it challenging to get my PHP application connected to the Clover API, and I need help resolving this. Successful completion involves understanding the problem, debugging the code, and ensuring seamless integration with my current systems. The primary purpose of this project is to facilitate payments processing via the Clover system. The right candidate for this role should have: - Strong proficiency in PHP, with specific experience in Clover API. - Proven track record in debugging and troubleshooting API issues. - Solid understanding of API integration into existing systems. - In-depth knowledge of payment systems...

    $52 / hr (Avg Bid)
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    We are looking to pull all information from all major ecommerce marketplaces' dashboards into one dashboard. We are a Dropshipping agency: We offer to setup and manage e-commerce businesses for our clients. So fear each client we want them to have their own dashboard where they will be able to see information that is already on the marketplaces we sold on' dashboard all accumulated into one dashboard. Example amazon $10k Sales, Walmart $10k Sales, TikTok Shop $10k Sales etc on our dashboard it should say $30k in sales.... We will also want a basic profile section where customer can setup their account profile like personal info (name, phone number, email etc), Business Information (Business name. Formation docs upload, EIN number etc) and Credit information (credit card info an...

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    We are looking for a proficient Zoho developer to assist us integrating Zoho with Akiles via API. Key tasks & responsibilities: - Integration of our Zoho CRM with Akiles From Zoho I have to be able to communicate with Akiles API and: - Create an User - Give access to specific location for a period of time. You need to create an interface where an user can login and can press a button to open the door assigned in Akiles. Required Skills & Experience: - Proficiency in Zoho CRM - Experience integrating Zoho with other platforms. - Knowledge of Akiles platform. This role is not just about skills but timing as well, therefore we require someone who can accomplish these tasks within a strict 30-35 days timeframe.

    $709 (Avg Bid)
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    I require an expert in social media automation to create a unique, custom project for me. This system needs to manage actions for an unlimited number of Instagram accounts daily, autonomously handling the following: - Liking and commenting on posts. - Following and unfollowing users. - Sending automated Direct Messages. This platform is expected to be robust, effective, and user-friendly. Due to the scope of work, proficiency in programming, social media algorithms, Instagram API, and automation is necessary. Familiarity with pre-existing automation tools like Jarvee, FollowLiker, and Instazood is a plus, though this project requires a bespoke solution. The final deliverable should be a fully functional, easy to use system. The right freelancer will demonstrate a proven track re...

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    Frontend task 1 day left
    VERIFIED

    I need someone good with HTML CSS and JavaScript for a frontend task. It requires making an own very small website with 5 different HTML files and fetching data from an open API. The structure and the design are up to you and how to do it. Please message me and I will send the info. Looking forward to hearing from you. :)

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    I'm in need of someone who can rapidly develop a WebView application featuring a landing screen. The landing screen should prominently display my company's logo and name. I'd also like it to offer our contact information, specifically a phone number and physical address, to those who need it. Ideal candidate: - Must have experience with WebView applications - Be able to work quickly given the time-sensitive nature of the project - Have graphic design skills or the ability to incorporate provided images smoothly into the application's design.

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    I need a developer to build a program to automatically send a predefined, one-time message to all my WhatsApp contacts. This program should be capable of: - Fetching contacts from my WhatsApp - Sending the specific message to all contacts Ideal candidates should have strong programming skills and prior experience with WhatsApp API. An understanding of automation, especially in messaging applications, would also be beneficial. Please be prepared to demonstrate any relevant work or skills in this area when you bid.

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    In the quest to further enhance our customer experience, we are looking for a talented freelancer to help us develop an efficient customer support chatbot for our WhatsApp Business account. The successful candidate should also help us in the verification process of this account. Key tasks include: - Developing a chatbot tailored to offer customer support - Assisting in verifying WhatsApp Business account An Ideal freelancer should: - Have the acumen to write detailed and comprehensive project proposals - Have demonstrable experience in chatbot development, particularly on WhatsApp Business platform - Understand the dynamics of WhatsApp Business account verification - Be willing to provide support beyond project completion This is an opportunity to add a reputable brand to your portfoli...

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    offers form building and CRM with no code. When we discuss, you would indicate what the possibilities are, and I would provide you with a basic flow. You indicate the estimated time to put ittogether. Needed within Formaloo logic: - Advanced logic question flow - Scheduling a meeting right in the platform using Calendly or similar. - Pipeline - Email automatically sent - Chatbot?

    $16 / hr (Avg Bid)
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    I'm seeking an expert in Azure and Backend API development to build an API marketplace specifically for data processing services. We are building few API using Python and Microsoft. I need help for setting it up on azure in a way we can monetise it. 1) Customer should be able to purchase our API on pay as you go model or pre paid subscription 2) Unique key for each user 3) Restriction, security management of the API 4) Anything which you think we would need. Looking forward to hear from you. Regards, Akshay

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    Explicit Filtering Phase project as discussed in chat for phrase detection and resultant redirect.

    $470 (Avg Bid)
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    Developper mon site web 6 days left
    VERIFIED

    Je souhaite développer des fonctions qui vont permettre d’afficher des tableau de statistique en fonctions d’une liste de chiffre.

    $196 (Avg Bid)
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    Preciso de uma automação no N8N que leia uma tabela no Notion e crie campanhas de Pesquisa no Google ADS usando a API do Google. A automação deve atender os seguintes requisitos: - Ler uma tabela do Notion e carregar as linhas que tem a propriedade STATUS = “A Fazer” e Plataforma = "Pesquisa". Carregar os campos: Palavra Chave, Volume, Palavras Secundárias, Título, Subtítulos, ID_LP, Link da LP, ID_Artigo. - Criar via ChatGPT as variações de anúncios a partir das palavras chave, Título e Subtítulos trazidas do Notion - Criar as campanhas de Pesquisa no Google ADS com orçamento de R$20 - Enviar msg de WhatsApp informando quais campanhas foram criadas - Atualizar no Notion...

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    Necesito desarrollar una etensión gateway de spreecommerce para usar la pasarela de pagos payway.

    $156 (Avg Bid)
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