About Cosign

Cosign is revolutionizing the $4 trillion rental industry with a market-leading rent guarantee platform that’s expanding housing access for renters while boosting occupancy for landlords. We’re not just building another tech platform—we’re solving a massive social problem that affects 40% of renters who struggle to qualify for their dream apartments.

Backed by top VCs, Cosign is built by experienced landlords who deeply understand the rental market’s needs. We’re helping families, students, and young professionals secure housing when traditional screening falls short.

What You’ll Do

Build high-impact features that directly increase occupancy and help families secure housing
Scale our product to match rapid growth
Collaborate on product strategy and technical architecture decisions

Our Tech Stack

Backend + Database: Ruby on Rails, Ruby, PostgreSQL
Frontend: React, JavaScript, TypeScript, HTML, CSS
Infrastructure: Render.com (AWS/GCP migration planned)
Other Services: AppSignal, GitHub Actions, Resend, Cloudflare (R2)

What We’re Looking For

5+ years of engineering experience with strong Ruby on Rails skills
Strong React/JavaScript expertise – our frontend is React-focused
Full-stack mindset – you’re comfortable working across the entire stack
CS degree or equivalent engineering background

Compensation & Benefits

Base salary: $140K-$200K + Equity
Comprehensive health benefits – 100% medical, 90% dental/vision coverage
Laptop and equipment provided
Team offsites 2x per year

Why Join Cosign Now?

Mission-Driven Impact: Help solve the housing crisis affecting 40% of renters nationwide – from college students to hardworking families who deserve housing stability.
Founded by Industry Insiders: Built by landlords for landlords.
Growth Trajectory: Clear path to becoming the #1 guarantor platform in the US.
Early Team Member Benefits: Join as one of the first engineers with significant equity upside and the opportunity to shape our technical direction as we scale.

Cosign

New Jobs

Full Stack Engineer

Full-Stack Software Engineer (Proptech / Insurtech)