Justin Eberlein

I implemented Tetris in Ruby 2D, using a specialized color scheme to help treat amblyopia. Instead of using colors based on the block shape, I used red for all the stationary blocks and blue for the falling blocks to force people's eyes to work together.

I also created a simple wireframe 3D graphics engine that could show things in anaglyph 3D (red-blue 3D glasses), then made a 3D version of Pong with a similar goal.

A developer at Motorola's Kraków office had created a Java library for interfacing with radios to enable automated testing. However, this came with the issue of QA needing to upskill in Java to be able to use it. Instead, I built an application around it, which used advanced Java concepts, such as reflection, to dynamically generate test cases from human-readable configuration files. This solution offered two key benefits. First, QA teams only needed to learn how to write and modify configuration files, eliminating the need for Java expertise. Second, it simplified test maintenance, as Jenkins tasks could be easily understood by reviewing the config files rather than digging into the source code of the JAR file.

Long story short, there was a weird test failure on master at Amount that we were able to trace back to a bug in an internally developed library for amortizing loans. However, despite multiple other senior engineers and I investigating, no one could even figure out how the code was *supposed* to work, much less how to fix it. So, because it was only failing on weirdly specific data that wouldn't actually appear in production, we decided to just cautiously comment the test out and keep an eye on it while working on a better solution in the background. We decided to monitor it while working on a better solution in parallel.

I took the initiative to develop that solution. Given my familiarity with the underlying math, I began building a replacement library as a side project during scheduled cooldown periods. When the company was transitioning to a microservice architecture, it decided to use the new amortization microservice as an opportunity to switch. So I was brought onto that team, and it became my actual job to work on this library and matching microservice.