How Rectangle Health Built an AI Teammate That Writes Its Own Code

Rectangle Health, a healthcare payment technology company, has significantly enhanced its software development process by integrating a custom AI Teammate named Rex, powered by Oz, a cloud orchestration platform. Initially a personal project by Senior Software Engineer Matthew Chastain, Rex evolved into a pivotal tool for the company, capable of writing 54% of its own code and managing tasks across multiple repositories. This innovation addresses the challenge of scaling productivity and reducing tech debt by using specialized agents that automate workflows from ticket creation to pull requests, all initiated through Slack. In just 60 days, Rex contributed 139 commits and 97,000 lines of code, becoming essential to Rectangle Health's engineering operations. The platform has cultivated a culture of autonomous, efficient development, with plans for further integration with AWS Bedrock and the establishment of self-hosted infrastructure. The success of Rex has inspired other teams within Rectangle Health to explore building similar agents on the Oz platform, highlighting a shift towards an agentic development approach.

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