Staff Backend Engineer / International Payments

Seedscaler; San Francisco (CA); On-site; USD 120,000 - 160,000; Full time

Job summary

A forward-thinking fintech company is seeking a Staff Backend Engineer to lead the development of its backend platform for a consumer finance product. You'll work on critical systems that handle real money and help shape the engineering standards as the team grows. The role requires over 5 years of experience in backend development with a strong emphasis on security and reliability in financial technology environments, utilizing technologies such as Python, Postgres, Redis, and AWS.

Qualifications

• 5+ years of experience building and shipping backend web applications in Python, Go, or Rust.
• Strong understanding of backend systems including Postgres, Redis, and AWS.
• Proven experience in designing APIs and implementing production-grade systems.

Responsibilities

• Lead development of a backend platform that serves a REST API for mobile and web clients.
• Integrate with third-party providers across wallets, banking, and payment services.
• Establish backend standards for testing, observability, and security practices.

Skills

Backend web applications

Python

Go

Rust

Postgres

Redis

AWS

Job description

We’re looking for a Staff Backend Engineer to join a well‑funded, early‑stage fintech company building a consumer finance product for international users. You’ll own core backend systems powering iOS, Android, and web clients, and help set engineering standards as the team scales.

This is a senior, high‑ownership role. You will work closely with technical leadership to build secure, reliable systems that handle real money at scale.

Why consider this role

You want to work on modern financial infrastructure, including cross‑border payments.

You prefer senior, high‑agency teams that ship quickly and iterate in production.

You care about building robust systems with strong security and correctness.

You want meaningful influence on architecture and technical direction.

What you will do

• Lead development of a backend platform that serves a REST API for mobile and web clients.
• Integrate with third‑party providers across wallets, banking, authentication, ledgers, and payment rails.
• Own reliability and performance work, including scaling bottlenecks and improving system correctness.
• Establish backend standards (testing, observability, security practices, deployment patterns).
• Identify services worth splitting from the monolith for performance or isolation, and implement them.

Technologies

• Python (FastAPI) monolith
• Postgres and Redis
• AWS
• Openness to Rust and or Go for performance‑sensitive services

What we are looking for

• 5+ years building and shipping backend web applications in Python, Go, or Rust.
• Strong fundamentals across backend systems, including Postgres, Redis, and AWS.
• Experience designing APIs and shipping production‑grade systems that are reliable and secure.
• Experience in financial technology, payments, or regulated environments.
• Full‑stack capability, and a willingness to flex across the stack when needed.

If you are interested in learning more about this role, please reach out to us on LinkedIn!