How YC Hit 90 % Coverage on Its Mission‑Critical Applications Portal
Challenge
For an accelerator that reviews thousands of startup applications on tight deadlines, even a tiny glitch can block founders and erode YC's brand. The applications team faced major QA hurdles: branching multi-step logic with hundreds of unique applicant paths, lean engineering bandwidth with just two engineers, and surge-deadline volume with tens of thousands of founders submitting within the final 24 hours.
Solution
Spur's AI-powered agents simulate real applicants end-to-end, achieving 90% coverage in two weeks. The team uses a record-to-test workflow where they record a flow and Spur writes the test. Adaptive applicant agents handle every field and state change with zero script maintenance, and instant Slack alerts ensure issues are fixed before founders notice.
Results
90% Application-Flow Test Coverage
- 90%
Application-Flow Test Coverage - 100+
Manual QA Hours Saved per Batch
"Spur is shockingly easy to use—no coding, just plain English. Simply describe what you want to test, and Spur handles the rest. Onboarding was a breeze, and Anushka and Sneha are fantastic to work with."
High-Volume Deadlines, Lean Engineering Team
For an accelerator that reviews thousands of startup applications on tight deadlines, even a tiny glitch can block founders or flood support and erode YC's brand. The applications team faced three major QA hurdles:
• Branching, Multi-Step Logic: Dozens of conditional sections generate hundreds of unique applicant paths - far too many for manual test scripts.
• Lean Engineering Bandwidth: With just two engineers maintaining the portal and four batches a year, the team couldn't spare days for bug-bashes before every deadline.
• Surge-Deadline Volume: Tens of thousands of founders submit within the final 24 hours, so performance and reliability must hold up when traffic peaks.
Spur launches thousands of Agents each batch to emulate founders going through the flow
Spur's AI-powered agents simulate real applicants end-to-end:
• Rapid, comprehensive testing - 90% coverage in two weeks
• Record-to-test workflow - Ev records a flow, Spur writes the test
• Adaptive applicant agents that handle every field/state change with zero script maintenance
• Instant Slack alerts so issues are fixed before founders ever notice
Critical bug caught the Sunday night before peak submissions, preventing an outage for thousands of founders.
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