Senior Backend Engineer - Fintech & Crypto (SF On-site)

Location: On-site, San Francisco, California, United States

Compensation: $200,000 $400,000 USD per year

About Us: We're building a next-generation consumer finance app for emerging markets, in partnership with major distribution players. Our platform combines a virtual bank and cryptocurrency wallet, enabling users across the globe to move seamlessly within a single financial ecosystem. Why now? Stablecoins are transforming cross-border payments. This is a rare chance to rebuild financial infrastructure for the 3 billion people who need better financial rails. We are a small, senior-only team led by proven founders with successful exits. Well-funded and moving fast, every new hire helps shape our technical direction and product strategy while driving Day 1 impact on global financial inclusion.

The Role: We're seeking a Senior Backend Engineer to lead core backend development. You'll design and scale the systems that power our iOS, Android, and Web applications, including: Integrations with cryptocurrency wallets and banking service providers. Critical services for authentication, ledgering, and payment rails. Building a secure and highly reliable platform for real-money transactions at international scale. Our early stack will likely be a Python (FastAPI/Pydantic) monolith with Postgres and Redis on AWS, with opportunities to introduce Go and/or Rust for services requiring higher performance or concurrency. This role is critical You'll work directly with technical founders to define engineering standards, shape architecture, and build a high-performance backend from the ground up. As we scale, this role has the potential to evolve into a backend lead or broader engineering leadership role.

What We Offer: Day 1 impact on partner products used by millions globally. The chance to own architecture and technical vision from the start. A ground-floor opportunity in the rapidly growing stablecoin ecosystem.

Requirements: 5+ years building and shipping web applications in Python, Go, or Rust. Proven ability to design secure, reliable, and performant systems at scale.

Bonus Points: Experience in financial technology or payments. Full-stack engineering skills and flexibility to contribute across the stack. Strong design instincts and product-oriented thinking.