Senior / Staff Full Stack Engineer

$160,000–$260,000 base + equity | New York City | Hybrid

About the Company

SODA is partnered with an early-stage, venture-backed fintech rebuilding the financial operations behind the world's leading investment firms. Their platform reads messy source documents, models complex financial structures and moves money between banks and investors, with AI doing the heavy lifting and deterministic checks making sure every number is right.Already live with paying clients, this is a small, deliberately senior engineering team that hires top down.

About the Role

You'll own whole verticals end to end: data model, API, interface and production, working alongside the finance specialists who use the product every day. Stack is TypeScript and React, with Python and FastAPI on the backend.This is a senior or staff-level opportunity with early equity upside at a company already serving clients and building a deep engineering bench. Sound like the kind of ownership you're after?

Responsibilities

• Own whole verticals end to end: data model, API, interface and production.
• Work alongside the finance specialists who use the product every day.
• Build and maintain systems using a stack of TypeScript and React, with Python and FastAPI on the backend.
• Contribute as part of a small, deliberately senior engineering team that hires top down.

Requirements

• A true full-stack generalist skillset across frontend, backend, data and infrastructure (6+ years for Senior, 12+ for Staff).
• A fintech background, ideally building systems that handle money: payments, billing, ledgers or lending.
• Prior startup experience and a stable career history, with tenures long enough to have lived with your decisions.
• Daily hands-on use of AI coding tools (Claude, Cursor, or similar) to ship production code.