About OnSite

OnSite is the messaging platform replacing WhatsApp for teams in the built environment. We take field chaos and turn it into real-time collaboration — making work better for the people on the ground and the teams managing them. Backed by Tin Men Capital, Alter Global, Hustle Fund and Gondor Capital.

Why this is exciting

Construction is a $2T industry that has been underserved by software for decades. You'll be working on a mission-driven, user-focused product that solves real problems for real people — on a small, laser-focused team where your work ships fast and matters immediately.

About the Role

We're looking for an experienced Backend Engineer to own and evolve the core systems powering OnSite. You'll work on a modern serverless architecture to deliver the real-time collaboration tools that keep frontline teams connected.

What we're looking for technically

You're proficient in building backend system...