Rowan Titlestad

A legacy medical insurance claims processing system was about to undergo a major, incremental rewrite and the client wanted to be confident that the changes being made were not going to adversely impact their business.

I worked on a team (that varied between 2-4 developers) to develop a system that could record all the important inputs and outputs for thousands of actual claims every day and then reprocess those claims against an unreleased version of the system at night.

I worked on a large portion of every part of this system. I also created a deployment pipeline which automatically built, deployed and tested the system (in a separate environment created for this purpose) and then allowed deployments to the test and production environments to be triggered on-demand.

The above-mentioned system produced a huge amount of data so I was tasked with building a user interface that allowed processing differences to be classified based on user-defined rules. I also developed the UI as well as the back-end batch processing necessary to extract, classify, and report on the differences found.

Due to my previous experience with the system for reprocessing medical insurance claims, I was assigned to lead the team for this project.

We built an interface which allowed the user to create a test case based on a sanitized production claim and then customize parts of it. The user could then trigger the test case to run against a completely isolated test environment consisting of the different parts of the claims processing system running in Docker containers.

The goal of this project was to enhance the existing software used for the opening of accounts at the branches of a major South African bank in order to reduce both identity fraud and paper usage. I worked on many parts of this system and also coached other developers in the use of test-driven development and identifying and refactoring away code problems in the legacy codebase.

I worked with one other developer in building a new system for a cash management company.

The system allowed the user to enter the amount of cash they had counted and automatically reconciled this with the count made by a machine at the business where the cash was received. I later enhanced the system to also reconcile these amounts with the cash management company’s bank statement.