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Phaxis·San Francisco, United States·onsite

Senior Backend Engineer – Fintech Start-Up (Digital Only Banking)

Posted 3 days ago
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Ruby on RailsAssociate

About the role

What you'll do

  • Join a small, high-ownership team working directly with technical founders to build a fintech platform.
  • Develop and maintain the backend powering mobile and web frontends via REST APIs in a greenfield architecture.
  • Integrate with banking service providers, payment rails, ledger systems, and cryptocurrency wallets.
  • Establish engineering standards and scalable technical foundations for international market expansion.
  • Work with a tech stack including Python (FastAPI), PostgreSQL, Redis, AWS, and Rust/Go for performance-critical services.

What you should know

  • Ideal candidates have 5+ years of backend experience shipping production fintech software.
  • Expect to work in a highly ambiguous, fast-paced startup environment requiring flexibility.
  • Opportunity to influence core system architecture and engineering standards from the ground up.
  • Requires familiarity with fintech, payments, stablecoins, or banking infrastructure.
  • Candidates should be comfortable with full-stack capabilities and stepping into frontend tasks if needed.

About the company

  • A fast-growing fintech startup focused on digital-only banking and neobanking solutions.
  • Operates in the financial services industry with an emphasis on international scalability.
  • Values innovation and technical excellence, working closely with founders on core architecture.
  • Likely a small, agile team with a startup culture emphasizing ownership and rapid iteration.
  • Uniquely positioned in the fintech space with cryptocurrency and payment rail integrations.

Key required skills

PythonFastAPIPostgreSQLRedisAWSRustGoREST APIFintech

Summary generated from the original posting.