Hamza Waleed

The Bitcoin Company allows users to earn Bitcoins back on every purchase and help them learn, earn, spend, save, borrow, and buy Bitcoin, all in one place. We've built a simple, private, and easy-to-use app with all the traditional financial tools expected in a bank but with Bitcoin at its core.

I got this freelance project from my previous client, Sifir.io, which is also a Bitcoin wallet but with different features. I joined the team in the initial phases, worked on converting mockups to responsive design using code, and integrated some APIs like auth and transaction verification. I also configured the project for the Detox end-to-end testing tool and wrote test cases for every edge case so that we could confidently release it to the public. It was in the beta version when I last worked on it.

Jobcase is a leading platform for blue-collar workers in the US, and I've been involved in developing their React Native-based app.

Taking part in the team as a senior software engineer, I've designed and shipped new features while maintaining the existing codebase. I also led a group of seven engineers to ensure we would get the expected results and not just meet the timeline but exceed the client's expectations in each sprint.

My technical achievements on this project include:
• Performing multiple code audit activities to identify the bottlenecks and inefficient coding patterns that can be improved
• Upgrading the React Native version from 0.64 to 0.68, thus fixing several breaking changes
• Improving the app performance by implementing memoization techniques
• Adding a feature that allows app users to connect
• Mentoring a team of junior developers on implementing a full-fledge chat feature, which increased app engagement significantly
• Integrating the Detox testing tool for end-to-end testing of the app over GitLab pipelines using a custom runner, which assures that our develop branch is always stable and ready to release

Sifir.io is a React Native-based Bitcoin wallet built on Cyphernode, which was lightning-enabled and featured the world's first Wasabi Mobile Wallet. Privacy and UX were not orthogonal.

It was an open-source project, and I got the opportunity to work on it as an internal contributor. My responsibility was converting a unique UI design to code with super-fluid animations without overloading the JavaScript thread in React Native.

We wanted it to be beautiful and intuitive, and we also rethought the user experience to optimize it for mobile and make it usable by everyone. It allows users to select the level of privacy and anonymity they want their coins to have and to set the privacy threshold and wallet to where they wish to send their mixed coins automatically.

The owner, an engineer from Canada, was thrilled with the results and raised my hourly rate twice in a week without my request.

Imparting wisdom to the masses, I write quality technical content regularly for my audience. Also republishing the articles on medium and my LinkedIn newsletter. All the articles are automatically listed on my GitHub profile via a CI pipeline that's triggered after every hour.