Senior Full-Stack/Backend Engineer - Real-Time Data Sync & API Development

About 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. The work is roughly 80-90% backend. The engineering team is flat: one engineering lead, one being promoted internally to a second lead, and everyone else working across products. No specialization yet. You'll own features end-to-end as an IC with no traditional manager layer. You'll be closely intertwined with the product, talking directly to customers and shipping features they depend on.Technical challenges are substantial: unifying dozens-to-hundreds of fragmented systems under a single standard, connecting to on-prem systems (SQL-based, DLL-based, API-based) built 20-40 years ago, handling millions of API requests per day, building reliable APIs on top of legacy systems with SLA enforcement, and creating scalable testing frameworks across 1,000+ endpoints. The team ships daily based on real customer feedback.

What You'll Own

1. Build and maintain the unified API layer that connects construction ERPs to modern software (legacy SQL, DLL, and API-based systems from 20-40 years ago)
2. Ship core backend systems for ERP Sync, AP Automation, Expense Management, and Vendor Management, with frontend work on apps that dog-food the API
3. Solve real-time data sync challenges, including web-socket implementations for systems that lack native webhooks
4. Build scalable testing frameworks to catch edge cases across 1,000+ endpoints Engage directly with customers and ship features daily based on real feedback

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Requirements

Must-Have

1. 1-5 years of backend or full-stack engineering experience (exceptional new grads with strong intern/co-op experience considered)
2. CS degree from a strong engineering program
3. Familiarity with cloud infrastructure (AWS preferred)

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4. Self-motivated, high-ownership, low-ego operator who can ship in a fast-paced, intense team environment
5. Pumped to work in-person 5 days a week in SF (remote optional only for exceptional candidates outside the Bay Area)

Nice-to-Have

1. Prior startup or founding engineering experience at pre-Seed through Series C

2. Top 20-30 school CS background. UWaterloo is a particularly strong signal.

3. Serious athlete background (college or high school competitive sport)

4. Competitive academic background: high GPA, meaningful honors, debate, or other competitive extracurriculars Multi-year tenure at a previous role (signals depth and follow-through)

Benefits & Perks

1. 90% healthcare cost coverage with multiple plan options
2. 100% 401k match up to 4% of annual salary Sizable relocation bonus for candidates outside Bay Area
3. On-site gym with Peloton, squat rack, Tempo, and yoga setup
4. Visa sponsorship for H1B, TN, and other visa types