Profile 8.B Senior Backend Developer

Location: Off-site

Security Clearance N/A

Reference No RFQ VS/CMRE-56 / Off-site

Deadline For Application 12/08 /2026

Introduction This is a hands-on engineering role with strong ownership. You will lead features end-to-end—from technical discovery and design through implementation, testing, deployment, and runtime monitoring—prioritizing reliability, performance, and security. You will participate in code reviews, mentor peers, contribute to architectural decisions, and proactively surface technical risks and trade-offs. Clear, timely communication on progress and blockers is essential.

Skills, Knowledge, Experience Required

• Back-End Development & Programming

• Python: Advanced proficiency; clean, idiomatic code; familiarity with the ecosystem (virtual environments, packaging, type hints, async/await) ;

• Frameworks: Production experience with FastAPI famwork and async best practices ;

• OOP & design patterns: Solid object-oriented design skills; familiarity with common design patterns (factory, strategy, repository, dependency injection) ;

• Domain-Driven Design (DDD): Strong practical experience applying DDD principles, including bounded contexts, aggregates, repositories, domain services, ubiquitous language, and event-driven domain modelling ;

• Performance: Profiling, caching strategies, connection pooling, async processing, background task queues (Celery, Dramatiq , or equivalent) ;

• API Design & Development

• RESTful APIs: Resource modelling, versioning, error handling, pagination, OpenAPI /Swagger documentation ;

• Data formats: JSON, JSON Schema validation; familiarity with serialisation libraries ( Pydantic , Marshmallow) ;

• Event-driven systems: Message brokers (Kafka, MQTT, Azure Event Hubs etc.), pub/sub patterns, async task processing ;

• Databases & Data Persistence

• Relational databases: Strong SQL skills; experience with PostgreSQL and/or SQL Server; schema design, indexing, query optimisation, migrations ;

• Graph databases: Strong hands-on experience designing and working with Neo4j graph databases, including Cypher query optimisation and graph data modelling ;

• Geospatial & temporal data: Strong experience modelling, processing, querying, and extending geospatial and temporal datasets and services; familiarity with spatial indexing, time-series data, and geospatial standards/tools ;

• Containerisation & Linux

• Docker: Writing Dockerfiles (multi-stage builds), Docker Compose for local development, image optimisation ;

• Kubernetes: Basic understanding of K8s concepts (pods, services, deployments, ConfigMaps ) for deploying and debugging applications ;

• Linux: Comfortable with the command line; shell scripting, process management, file permissions, networking basics ;

• Software Engineering Practices

• Testing: TDD, unit testing ( pytest ), integration testing, mocking, code coverage; awareness of contract testing ;

• CI/CD: Building and maintaining pipelines (GitHub Actions, GitLab CI, Azure DevOps, or equivalent); automated linting, testing, and deployment ;

• Version control: Advanced Git usage, branching strategies ( GitFlow , trunk-based), pull/merge requests, rebasing, conflict resolution ;

• Code quality: Static analysis, linting (Ruff, flake8, mypy ), code review best practices, documentation (docstrings, ADRs) ;

• Security

• Secure coding: OWASP Top 10 awareness, input validation, output encoding, secrets management ;

• Authentication & authorisation: OAuth 2.0, OpenID Connect, JWT; experience integrating with identity providers ( Keycloak , Entra ID, or equivalent) ;

• API security: Rate limiting, CORS, TLS, API key management ;

• Architecture Awareness & Collaboration

• Architecture literacy: Ability to read and contribute to architectural documentation (C4, UML); understanding of microservices, event-driven, and layered patterns ;

• Agile: Active participation in sprint ceremonies, backlog refinement, estimation, and retrospectives ;

• Communication: Clear reporting of progress and blockers; collaboration with architects, front-end developers, QA, DevOps, and UX designers ;

• English proficiency: Excellent written and spoken English in a professional/international context .

Desirable :

• Cloud Platform Experience

• Microsoft Azure: Entra ID, Azure DevOps, Key Vault, etc. ;

• Cloud-native development: Managed databases, serverless functions, environment configuration, cloud logging and monitoring ;

• Observability & Reliability

• Logging & monitoring: Structured logging, centralised log aggregation, application metrics (Prometheus, Grafana, or equivalent) ;

• Distributed tracing: OpenTelemetry instrumentation for backend services .

Duties/role:

• Designing, building, and operating scalable services and data pipelines powering maritime geospatial and temporal analytics across the platform ;
• Developing production-grade APIs and microservices, integrating with Neo4j for graph-centric use cases, and leveraging Databricks for data engineering and ML workflows ;
• Collaborating closely with architecture, data engineering, and product teams to translate domain models into clean, testable code using Domain-Driven Design ;
• Defining clear bounded contexts, aligning contracts and schemas, and ensuring services reflect the ubiquitous language of the domain ;
• Leading features end-to-end, from technical discovery and design through implementation, testing, deployment, and runtime monitoring ;
• Prioritizing reliability, performance, and security throughout the software development lifecycle ;
• Participating in code reviews, mentoring peers, and contributing to architectural decisions ;
• Proactively identifying and communicating technical risks, dependencies, and trade-offs ;
• Providing clear, timely communication on progress, challenges, and blockers ;
• Taking ownership of solutions and continuously driving engineering excellence.

Additional information: If you are interested, for further information, please contact the point of contact for this offer. VECTOR SYNERGY sp. z o.o., ul. Marcelińska 90, 60-324 Poznań, NIP PL7811857270, REGON 301575740, KRS: 0000369575

Rejestr Przedsiębiorców KRS prowadzony przez Sąd Rejonowy Poznań – Nowe Miasto i Wilda w Poznaniu, VIII Wydział Gospodarczy KRS, kapitał zakładowy wynosi: 73.852,80 złotych wpłacony w całości, TEL +48 616684500, FAX +48 616684501, www.vectorsynergy.com , [email protected]