National Machine Coding, LLD and Production Debugging Contest

About the hackathon

LeetCode tests algorithms. Engineering Cup tests whether you can actually build software. Gronex Engineering Cup #1 is a free, online, 2-hour contest for students and working engineers. You solve three brand-new problems inside real code repositories, in your browser, and every submission is auto-graded against a real test suite. Platform: The contest is conducted entirely on Gronex, in its browser-based coding workspace with built-in auto-grading. Unstop is used for registration and announcements; the problems are solved and scored on Gronex at gronex.org/contest/engineering-cup-1. When: Saturday, 31 October 2026, 7:00 PM to 9:00 PM IST (2 hours, online). The Problems: Machine coding (Easy): build a working module against a real test suite. Low-level design (Hard): extend an existing codebase without breaking what already works. Production debugging (Hard): app, database and cache logs from a failing service. Find the root cause and fix the bug that took prod down. Solve in Java, Python, Node.js or C++ . Everything runs in the browser workspace, so there's nothing to install. How Scoring Works: Each problem is scored by the % of tests passing on your best run inside the contest window. Your total is the sum across the three problems (max 300). Part of each test suite is hidden and only runs at grading, so the code has to be correct, not just m…

Tracks & themes

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Timeline

1. Registration closes

   Sat, 31 October 2026

   5 days left

2. Hacking begins

   Sat, 31 October 2026

3. Submissions close

   Sat, 31 October 2026

Prizes & benefits

• Certificates

Eligibility & rules

Organizer

Official links

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