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# Software Engineer

- **Company:** AtoB Inc.
- **Location:** San Francisco, CA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Automation of Tests, Software as a Service, PostgreSQL, Ruby, ReactJS, Backend, Front End Software Development, Marketplace
- **Published:** September 4, 2026
- **Apply:** https://startup.jobs/senior-software-engineer-full-stack-_atob_-7666062

## About the Role

* Have 5+ years of professional experience building B2B or B2C SaaS products (FinTech, payments, or marketplace a plus).
 * Thrive in zero-bureaucracy, high-ownership environments.
 * Balance speed with rigor-automated tests, clean abstractions, clear docs.
 * Can participate in architecture discussions and still dive deep into code (we use React, Ruby, Postgres-but great engineers pick up tools fast).
 * Communicate crisply across time zones.
 * This role is required to be in office 4 days/week (Mon-Thurs) either in San Francisco Bay Area or New York

## Description

* Lead efforts for often ambiguous technical projects, laying the groundwork for early-stage products to iteratively evolve and scale.
 * Design, build, and maintain APIs, user-facing experiences, services, and systems.
 * Make effective tradeoffs between business priorities, user experience, and reliability.
 * Work with critical frontend, backend & platform projects end-to-end-from design to production ops.
 * Push architecture that scales to billions in annual payment volume and real-time risk controls.
 * Work closely with product and GTM leads to turn ambiguous problems into elegant code.


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