Senior Software Engineer (Backend)

About OnSite

OnSite is the messaging platform replacing WhatsApp for construction teams. We're building tools that turn construction site chaos into easy communication and structured documentation.

About the Role

We are seeking an experienced Back End Engineer to join our team. You’ll work on a modern serverless architecture, integrating with various SaaS platforms to deliver real-time collaboration tools for construction teams.

What we're looking for

You're experienced in building backend systems and can work across our stack:

• Proficient in TypeScript and Python
• Deep expertise in AWS serverless development (Lambda, API Gateway, RDS, Step Functions, etc.)
• Strong experience building and optimizing RESTful APIs and event-driven architectures
• Solid understanding of MySQL and Elasticsearch
• Comfortable integrating third-party APIs (Auth0, Jira, Sendbird, etc.)

Nice to haves

• Experience building platforms for construction, project management, or collaboration tools
• Understanding of real-time messaging and notification systems
• Knowledge of task tracking and project management concepts

What matters more than any of this

Can you ship fast? Debug independently? Learn what you don't know? Work well with a small team where everyone wears multiple hats?

We're looking for someone who can own features end-to-end and isn't afraid to get their hands dirty across the stack.

Comp

Competitive salary + meaningful equity. Every early hire has outsized impact and ownership.

Why this is exciting

You'll be working on developing a mission-driven, user-focused product, solving real problems in a $1.8T industry that desperately needs better tooling. We’re a small, laser-focused team, where your work ships fast and matters immediately.

Interested? Email hello@on-site.io with your background, links to projects/GitHub, and why construction tech excites you.

OnSite is an equal opportunity employer committed to diversity and inclusion.