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Senior Backend Developer, Python
Location
Poland
Posted
46 days ago
Salary
0
Seniority
Senior
Job Description
Senior Backend Developer, Python
Work Life Group
• building, and maintain robust server-side applications and APIs that power CMRE Data Management Program of Work • work in the design and development of CMRE Data Catalogue, Data Domain Model, Data Sharing Workflow • work within an Agile team under the guidance of the Software Architect, translating architectural designs into production-grade code while upholding high standards of quality, security, and performance • participate in code reviews, mentor junior developers, contribute to architectural discussions, and proactively flag technical risks or impediments to the team lead and project management
Job Requirements
- 7 years in back-end software development
- Python: Advanced proficiency; clean, idiomatic code; familiarity with the ecosystem (virtual environments, packaging, type hints, async/await)
- Production experience with FastAPI framework and async best practices
- Solid object-oriented design skills; familiarity with common design patterns (factory, strategy, repository, dependency injection)
- Profiling, caching strategies, connection pooling, async processing, background task queues (Celery, Dramatiq, or equivalent)
- RESTful APIs: Resource modelling, versioning, error handling, pagination, OpenAPI / Swagger documentation
- Strong SQL skills; experience with PostgreSQL and/or SQL Server; schema design, indexing, query optimisation, migrations
- Working knowledge of at least one document, key-value, or search store (MongoDB, Redis, Elasticsearch)
- Experience with ORMs (SQLAlchemy, Django ORM)
- Writing Dockerfiles (multi-stage builds), Docker Compose for local development, image optimisation
- Basic understanding of K8s concepts (pods, services, deployments, ConfigMaps)
- Comfortable with the command line; shell scripting, process management, file permissions, networking basics
- TDD, unit testing (pytest), integration testing, mocking, code coverage; awareness of contract testing
- Building and maintaining pipelines (GitHub Actions, GitLab CI, Azure DevOps, or equivalent); automated linting, testing, and deployment
- Advanced Git usage, branching strategies (GitFlow, trunk-based), pull/merge requests, rebasing, conflict resolution
- Static analysis, linting (Ruff, flake8, mypy), code review best practices, documentation (docstrings, ADRs)
- OWASP Top 10 awareness, input validation, output encoding, secrets management
- OAuth 2.0, OpenID Connect, JWT; experience integrating with identity providers (Keycloak, Entra ID, or equivalent)
- Rate limiting, CORS, TLS, API key management
- Ability to read and contribute to architectural documentation (C4, UML); understanding of microservices, event-driven, and layered patterns
- Active participation in sprint ceremonies, backlog refinement, estimation, and retrospectives
- Clear reporting of progress and blockers; collaboration with architects, front-end developers, QA, DevOps, and UX designers
- Excellent written and spoken English in a professional/international context.
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