Senior Python Backend Architect (Remote)

OnHires; Polska; Hybrid; PLN 306,000 - 481,000; Full time

Job summary

OnHires is seeking a Senior Python Software Engineer to design, build, and evolve the backend infrastructure powering an AI-first platform. You will own backend components end-to-end, from design through production, focusing on scalable Python services and distributed systems.

The role emphasizes architecture, performance tuning, and collaboration with product and engineering, in a fully remote Eastern Europe setting with core hours roughly 11:00-18:00 CET.

Qualifications

• 5+ years of commercial Python software development experience, primarily focused on backend systems.
• Strong object-oriented programming and core software engineering fundamentals.
• Proven experience designing and building production backend applications and services.
• Strong hands-on experience with system design and backend architecture.
• Experience designing and developing microservices and distributed systems.
• Practical experience with asynchronous and/or event-driven processing.
• Experience with Django, FastAPI, or comparable Python backend frameworks.
• Experience with RabbitMQ, Kafka, or similar messaging systems.
• Strong understanding of distributed-system concerns such as reliability, retries, idempotency, and failure handling.
• Experience solving production scalability and performance problems, including identifying system bottlenecks and reasoning about horizontal scaling.
• Strong relational database fundamentals and experience investigating query performance, transactions, concurrency, or database bottlenecks.
• Ability to reason clearly about architectural trade-offs, failure modes, scalability, and reliability.
• Experience taking meaningful technical ownership of systems, services, or substantial backend functionality.
• Experience with Docker and Kubernetes.
• Strong understanding of the complete Software Development Lifecycle (SDLC).
• Solid Git workflow and version control experience.
• Experience working in agile, cross-functional product teams.
• Good written and spoken English.

Responsibilities

• Design, build, and evolve scalable Python backend services and microservices.
• Own backend components end-to-end, from system design and technical decisions through implementation, testing, deployment, and production support.
• Design asynchronous and distributed workflows and real-time communication components.
• Work with messaging systems, event-driven processing, and distributed application patterns.
• Design systems with scalability, reliability, consistency, and failure handling in mind.
• Investigate and solve production performance and database bottlenecks.
• Make architectural decisions and evaluate trade-offs between different technical approaches.
• Collaborate closely with Product, QA, and Engineering throughout the SDLC.
• Write clean, maintainable, well-tested production code.
• Contribute to architecture reviews, code reviews, documentation, and engineering best practices.

Skills

Python

Django

FastAPI

Architecture

Distributed systems

Asynchronous

Docker

Kubernetes

PostgreSQL

NoSQL

RabbitMQ

Kafka

REST APIs

Git

SDLC

English

Tools

Docker

Kubernetes

RabbitMQ

Kafka

PostgreSQL

NoSQL

Job description

OnHires is seeking a Senior Python Software Engineer to design, build, and evolve the backend infrastructure powering an AI-first platform. You will own backend components end-to-end, from design through production, focusing on scalable Python services and distributed systems.

The role emphasizes architecture, performance tuning, and collaboration with product and engineering, in a fully remote Eastern Europe setting with core hours roughly 11:00-18:00 CET.