Builders Day

Builders Day by HackUnion is the culmination of the OpenBuild Week journey, a space where builders come together to collaborate, solve problems, build products, and compete.

From learning to building.
From ideas to prototypes.
From campus communities to one Builders Day.

This is where builders come to build.

Before You Join

Builders Day is not about starting your project from scratch on the final day.

Projects can be developed from 28 July to 26 September, with the final submission deadline at 3:00 PM IST on 26 September.

Whether you're bringing an MVP from the OBW Campus Series or building independently, come prepared with a working product. We recommend having your project ~95% complete before Builders Day.

Use the final day to improve, test, scale, polish, network, showcase your work, and celebrate what you've built.

Your project will be evaluated on:

• Accessibility
• Working Product
• Purpose & Scalability
• Pitching

Read the Hackathon Guide Before You Start

We've put together the Builders Day Participant Guide with everything you need to know — eligibility, project requirements, development timeline, judging criteria, submissions, AI and tool usage, team participation, prizes, final-day expectations, and the submission checklist.

📖 Read the complete Hackathon Guide → HACKATHON GUIDE LINK

Read it. Prepare your project. Then come ready to build.

Builders Day

26 September 2026

Build it. Ship it. Show what it can become.