Saturday, October 31, 2026 · 7:00 pm – 9:00 pm
What it is Gronex Engineering Cup #1 is a free, online, two-hour engineering contest that moves beyond algorithm puzzles. Instead of LeetCode-style problems, participants solve three brand-new challenges inside real code repositories, directly in the browser, with every submission auto-graded against a real test suite.
Who it's for Students and working engineers who want to prove they can actually build and ship software - not just solve isolated puzzles. Individual participation only (team size: 1).
The three problems
Languages and environment Solve in Java, Python, Node.js or C++. Everything runs in Gronex's browser-based coding workspace with built-in auto-grading, so there is nothing to install.
How scoring works Each problem is scored by the percentage of tests passing on your best run inside the contest window. Your total is the sum across the three problems (maximum 300). Part of each test suite is hidden and only runs at grading, so the code has to be genuinely correct rather than merely passing the visible tests. Ties go to whoever reached their final total first, and you can run as often as you like during the contest. A live leaderboard is shown on Gronex during and after the contest.
Prizes
How to participate Register on Unstop, then register on the contest page with a verified Gronex account (free) at gronex.org/contest/engineering-cup-1. At 7:00 PM IST on 31 October, the problems unlock on Gronex for registered participants. To warm up, try any free problem on gronex.org - it is the same workspace and test runner used on contest night.
Rules Free entry. One account per person; duplicate or automated accounts are disqualified. Only runs inside the contest window count. Only the AI help built into the Gronex workspace is allowed - using outside AI tools (ChatGPT, Claude, Copilot, etc.) or sharing solutions during the contest is not, and may lead to disqualification after review. Swag kits ship within India; winners share a delivery address after results. Results are final after review, and Gronex may disqualify entries that break these rules.
About the organiser Gronex is an India-based engineering practice platform offering browser-based coding workspaces with built-in test runners and auto-grading, aimed at helping engineers build and validate real software skills rather than isolated algorithmic drills. The Engineering Cup is its flagship contest series.