Junda Ai

Software Engineer III, iOS

Junda Ai is a Software Engineer III, iOS at Tinder, specializing in SwiftUI, mobile platform architecture, and developer tooling. He built the swipeable card in the Likes tab, developed testing and code coverage integrations for an internal VS Code extension, and led Team Undercover to win Tinder Hackathon 2025 by building local and CI-based agents that identify coverage gaps and generate missing unit tests.

Engineering

10 min

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Undercover Agent: How We Built an AI That Tests Coverage While We Sleep

We built an AI agent at a TinderⓇ hackathon that writes automated unit tests, won the engineering track, and deployed it straight into our CI pipeline. Here’s what we learned.