Senior Python Microservices Engineer (Remote)

payabl.; United States; Remote; USD 51,000 - 82,000; Full time

Job summary

payabl. is seeking a Senior Python Backend Developer to expand and modernize its service layer architecture. You’ll design and deploy reliable microservices using FastAPI and AsyncIO, while extracting business logic from legacy systems for a scalable platform payabl.one.

Remote work from Poland with a contractor arrangement, reporting to the Engineering Lead. The role emphasizes reliability, maintainability, and end-to-end ownership in a fintech‑adjacent environment.

Qualifications

• 5+ years of backend development experience with strong Python expertise.
• Deep knowledge of AsyncIO and FastAPI.
• Experience building non‑blocking, high‑reliability microservices.
• Strong experience with relational databases (MySQL, PostgreSQL) or PostgreSQL.
• Solid understanding of API design and third‑party integrations.
• Experience implementing webhooks, callbacks, and retry strategies.
• Strong testing practices (unit and integration testing).
• Ability to work with legacy systems and migrate them into modern architectures.
• Ownership mindset and ability to work autonomously within a defined architecture.

Responsibilities

• Design, build, and maintain high-performance Python microservices (FastAPI, AsyncIO).
• Analyze legacy systems and extract business logic into modern architectures.
• Refactor and migrate existing modules into clean, scalable services.
• Ensure system reliability through idempotency, fault tolerance, and robust error handling.
• Design and integrate external APIs, handling edge cases, retries, and failures.
• Implement and manage webhooks, callbacks, and complex retry mechanisms.
• Write high-quality unit and integration tests.
• Collaborate with cross-functional teams to ensure service stability and performance.
• Contribute to architectural discussions and continuous system improvements.
• Take ownership of services end‑to‑end, from design to production.

Skills

Python

AsyncIO

FastAPI

Microservices

PostgreSQL

API design

Testing

Legacy migration

Ownership

Tools

Docker

Kubernetes

Kafka

Redis

CI/CD

Job description

payabl. is seeking a Senior Python Backend Developer to expand and modernize its service layer architecture. You’ll design and deploy reliable microservices using FastAPI and AsyncIO, while extracting business logic from legacy systems for a scalable platform payabl.one.

Remote work from Poland with a contractor arrangement, reporting to the Engineering Lead. The role emphasizes reliability, maintainability, and end-to-end ownership in a fintech‑adjacent environment.