[Hiring] Senior Backend Developer (API Design & Development) @WLG

Role Description

We are seeking a Senior Python Backend Developer to design, build, and operate scalable services and data pipelines that power maritime geospatial and temporal analytics across the platform. You will:

• Develop production-grade APIs and microservices
• Integrate with Neo4j for graph-centric use cases
• Leverage Databricks for data engineering and ML workflows
• Collaborate closely with architecture, data engineering, and product teams
• Translate domain models into clean, testable code using Domain-Driven Design
• Define clear bounded contexts, align contracts and schemas
• Ensure services reflect the ubiquitous language of the domain
• Lead features end-to-end—from technical discovery and design through implementation, testing, deployment, and runtime monitoring
• Prioritize reliability, performance, and security
• Participate in code reviews, mentor peers, and contribute to architectural decisions
• Proactively surface technical risks and trade-offs
• Communicate progress and blockers clearly and timely

Qualifications

• 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 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
• 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
• Graph databases: Strong hands-on experience designing and working with Neo4j graph databases
• Geospatial & temporal data: Strong experience modelling, processing, querying, and extending geospatial and temporal datasets
• Containerisation & Linux
• Docker: Writing Dockerfiles (multi-stage builds), Docker Compose for local development
• Kubernetes: Basic understanding of K8s concepts 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
• CI/CD: Building and maintaining pipelines (GitHub Actions, GitLab CI, Azure DevOps, or equivalent)
• Version control: Advanced Git usage, branching strategies
• Code quality: Static analysis, linting, code review best practices, documentation
• Security
• Secure coding: OWASP Top 10 awareness, input validation, output encoding, secrets management
• Authentication & authorisation: OAuth 2.0, OpenID Connect, JWT
• API security: Rate limiting, CORS, TLS, API key management
• Architecture Awareness & Collaboration
• Architecture literacy: Ability to read and contribute to architectural documentation
• Agile: Active participation in sprint ceremonies, backlog refinement, estimation, and retrospectives
• Communication: Clear reporting of progress and blockers
• English proficiency: Excellent written and spoken English in a professional/international context

Company Description