I always offer flexible solutions to my customers. This reduces the period of time needed in case of design or features changes. Plans are just for getting you started, making a project awesome implies plan changes.
I developed software solutions for a variety of customers, from big corporations, to innovative companies that try to make a better world, to small startups.
I currently own 3 mobile applications, published on both apple's app store and google's play store, and another one for a customer is in process. It is a very feature rich application containing video streaming, YouTube streaming, complex download functionality, google casting, airplay and much more. All these apps were developed in React Native using, of course, third party libraries.
I also offered my full stack expertise on many projects. This involved back-end functionality, API development, database quarries on a MySQL server, automatic testing and front-end. I used Node.js for the back-end and API development, Mocha for automation and Angular for front-end.
SAP solutions are often used by big corporations. This was also the case for my customer for whom I developed two solutions for projects and resources management. I mostly worked on the front-end, using SAPUI5, but I was also involved in some work on the database and API.