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

Phaxis LLC | San Francisco, California, United States | Posted May 15, 2026

Job Description

Our client, a growing startup in the neobank space is adding two Senior Backend Engineers to join the team. You will work directly with the technical founders to architect, build, and ship a financial services platform across international markets. You will set standards and make decisions that will impact the systems WORKING IN A GREENFIELD ARCHITECTURE!

To be successful in this role you need to have experience shipping production fintech software before.

  • Core backend engineer powering the mobile and Web frontends via REST API

  • Handling integration with banking service providers, payment rails, ledger systems, and Cryptocurrency wallet

  • Create engineering standards and technical foundations for a system designed to scale internationally


Tech Stack


  • Python (FastAPI) monolith

  • PostgreSQL and Redis on AWS

  • Rust and/or Go...

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