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Senior/Staff Software Engineer, Core Product

fal.ai· Engineering
Apply on company site
San Francisco$180k - $250kFull-timePosted 3mo ago

About the role

Founding role on the team owning fal's core product systems (usage, billing, pricing, accounts, access, API keys, and model discovery). Design and evolve backend systems end-to-end with a first priority on billing, fraud, and pricing, then expand to accounts, access/identity, API keys, and model discovery. Focus on correctness, resilience, observability, and operational health in a revenue-critical platform.

Responsibilities

  • Own billing and pricing first — metering, usage roll-ups, pricing logic, and the customer/admin surfaces that make cost understandable and trustworthy.
  • Design APIs, data models, and product contracts other teams safely build on.
  • Grow into the broader portfolio — accounts, access/identity, API keys, and model discovery — and the surfaces that expose usage, cost, and access.
  • Engineer for correctness and resilience: source of truth, idempotency, auditability, permissions, observability, graceful failure.
  • Own operational health, including on-call for the systems you build.
  • Partner across product, infra, finance, revenue, security, and customer-facing teams — turning messy, manual workflows into durable systems.

Qualifications

  • 5+ years building reliable, production backend systems (Python and/or TypeScript).
  • Strong PostgreSQL — schema design, queries, migrations, performance.
  • API & data-model design for complex product or business domains.
  • Can ship product and internal surfaces in React / Next.js / TypeScript.
  • Strong systems judgment (source of truth, idempotency, auditability, permissions, observability) and product judgment (workflows, edge cases, customer trust).
  • Thrives in ambiguous, cross-functional work where product, business logic, and infra overlap; ships a pragmatic v1 that can evolve. Priorities move fast — you're comfortable with that.

Skills

Required:Backend development (Python, TypeScript)PostgreSQLAPI design
Nice to have:React / Next.js / TypeScript

Benefits

  • Interesting and challenging work
  • A lot of learning and growth opportunities
  • We offer visa sponsorship and will help you relocate to San Francisco.
  • Health, dental, and vision insurance (US)
  • Regular team events and offsites
Last updated Oct 17, 2026. Interested? Apply on the company site.

About fal.ai

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Company profileWebsite

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