A Software Engineer’s Guide to Agentic Software Development
December 9, 2025

I’ve cracked the code on breaking the eternal cycle – features win, tech debt piles up, codebase becomes ‘legacy’, and an eventual rewrite. Using coding agents at GitHub, I now merge multiple tech debt PRs weekly while still delivering features. Tickets open for months get closed. ‘Too hard to change’ code actually improves. This is the story of the workflow.
Source: A Software Engineer’s Guide to Agentic Software Development
Brittany Ellich a software engineer at GitHub shares how she works with Agentic coding tools day-in-day-out in her job.







