Led mobile frontend development for an AI-powered sports betting app that generates personalized predictive models for users. Built and maintained key features using React Native in a fast-paced startup environment, significantly improving user experience and code scalability. Collaborated closely with product and design to rapidly ship updates and support a growing user base.

During my time at Evernote, I was a part of the mobile team and contributed significantly to the development and release of their latest app. As a front-end software engineer, my responsibilities included UI design, feature development, and API integration. Using my expertise in React and React Native, I focused on creating a smooth and intuitive user experience, while ensuring high levels of performance and reliability.

· Worked on several projects, some of which are listed below, others in publications.

· Developed a dialogue branching tool for sale on the the Unity Asset Store, written in C#. The tool allows users to create complex dialogue trees using a graphical interface.

· Provide technical support for customers of the asset.

· Created a role-playing game released on Steam.

· Developed Android apps with Android Studio including a trivia game and an app that plots nearby fire violations in San Francisco using Google maps.

https://christopherdoornbos.com/portfolio/little-john/

I worked on the back end of a stock trading web app. I decided on a relational database since stock data would benefit from transactional integrity, and I ended up going with PostgreSQL specifically.

After deploying the service on an AWS EC2 T2-micro server, I used Nginx to load balance between three instances increasing my throughput from 600 RPS to the goal of 1000 along with an average 150 ms latency.

A Mosaic Tale is a full stack web app I created that lets people write stories together one sentence at a time.

I used websockets to connect the users to the Express server, and Mongo to keep a database of all of the users and the rooms they were in. People could join private rooms and take turns writing a story from scratch. User sessions allowed them to remain logged in and save the stories they've created and to read them again at any time.