Full-Stack Software Engineer

San Francisco, CA · On-site (5 days/week) · Full-time Compensation: $130,000–$240,000 + equity About the Company We're a profitable, fast-growing data infrastructure platform serving the construction industry — one of the largest and least-digitized sectors in the world. We have 550+ paying customers on multi-year contracts, have been profitable and cash-flow positive for over two years, and are growing 10% month over month. Our product is a layered platform spanning data connectivity through fully automated financial workflows. Founded 2021 · ~36 people · Industry: Property Tech / Construction data infrastructure The Role We're hiring full-stack/backend engineers who love simplifying complex systems, unifying fragmented data, and building large-scale infrastructure. You'll be hands-on with core backend systems syncing financial data across fragmented legacy software in real time (work is roughly 80–90% backend). You'll own features end-to-end as an IC on a flat engineering team, talk directly to customers, and ship daily based on real feedback. What you'll be doing Build and maintain the unified API layer connecting construction ERPs to modern software (legacy SQL, DLL, and API-based systems from 20–40 years ago) Ship core backend systems for ERP sync, AP automation, expense management, and vendor management, with frontend work on apps that dog-food the API Solve real-time data sync challenges, including web-socket implementations for systems lacking native webhooks Build scalable testing frameworks to catch edge cases across 1,000+ endpoints Engage directly with customers and ship features daily based on real feedback Tech stack Not explicitly specified. Referenced technologies: AWS (cloud, preferred), SQL/DLL/API-based legacy systems, web-sockets, high-volume API infrastructure. Requirements 1-5 years backend or full-stack engineering CS degree from top 20-30 school Cloud infrastructure: AWS preferred Startup or founding engineering experience High-ownership, low-ego operator Why Join Profitable and cash-flow positive — a durable business, not a pre-revenue bet End-to-end ownership on a flat team with no traditional manager layer; direct customer contact Genuinely hard backend problems: unifying hundreds of fragmented legacy systems under one API, real-time sync, millions of API requests/day, testing across 1,000+ endpoints #J-18808-Ljbffr