Engineering

How we built an automated unit test generation pipeline for iOS
June 24 Kush Agrawal

How a simple code change reduced CPU usage by 97%
June 22 Fabien Loudet

Triage, ship, debug—all from Slack
May 20 Aaron Wang

Seeing the future: frontend prediction in Duolingo’s mobile app
April 15 Xuanji Li

What I learned about incident management from search and rescue
March 25 Maggie Hewitt

Solving database contention with optimistic locking
December 22 Caleb Noble

Automating Golden Path upgrades at scale: a journey from manual upgrades to an AI-powered workflow
December 17 Guadalupe Aliseda-Canton

Agentic workflows: Scale AI prompts beyond cursor—no code required
December 11 Jesse Welch

2025 Duolingo Highlights: our biggest leaps in learning, play, and connection
December 10 Duolingo Team