Staff Software Engineer - High-Growth AI / FinTech (Sonoma)

Staff Software Engineer (IC) High-Growth AI / FinTech Startup

Full-time Hybrid (San Francisco)

$220k$300k + equity

A well-funded, rapidly scaling startup in the AI-driven fintech space is looking for an experienced Staff Engineer to take ownership of reshaping the foundations of their core platform. After two years of fast iteration and customer growth, the product has evolved into a set of independently built services. They now need a senior IC who can bring coherence, scalability, and long-term architectural stability as the engineering team expands.

This is a high-impact individual contributor role working directly with the CTO. Youll set technical direction, oversee major system redesigns, and help prepare the platform to support significantly larger usage, customer demands, and a future 2040+ engineer organisation.

What Youll Be Doing

Lead architectural transformation

• Redesign major components into a unified, maintainable, scalable system.
• Remove legacy code, reduce fragmentation, and introduce sound architectural patterns.
• Define technical standards and guide the broader engineering team towards consistent, high-quality design.

Drive high-leverage engineering work

70% auto-approval / denial rate).

Influence and elevate the engineering culture

What Theyre Looking For

Tech Environment

Why This Role Is Exciting