Senior Python Backend Developer - API Design
Posted Today by IO Associates
£350 Per day
Outside
Remote
England, UK
Summary: The role of Senior Python Backend Developer focuses on designing, building, and operating scalable services and data pipelines for maritime geospatial and temporal analytics. This fully remote, part-time contract position requires strong expertise in API design and development, particularly using FastAPI, along with a hands-on approach to feature ownership. Candidates must be nationals of NATO member countries and possess advanced skills in Python and Domain-Driven Design. The position emphasizes leadership in feature development from discovery to deployment and monitoring.
Key Responsibilities:
- Developing asynchronous, production-grade APIs and microservices using FastAPI.
- Integrating and optimizing graph-centric use cases using Neo4j and Cypher query modeling.
- Leveraging Databricks for data engineering and ML workflows.
- Leading features end-to-end from technical discovery and design through implementation, testing, deployment, and monitoring.
Key Skills:
- Deep proficiency with asynchronous Python, type hints, and async best practices.
- Strong practical experience applying Domain-Driven Design (DDD) principles.
- Heavy hands-on experience with Neo4j and strong relational SQL (PostgreSQL/SQL Server).
- Experience modeling, processing, and querying geospatial and temporal datasets.
- Robust knowledge of Docker, event-driven systems, and secure coding practices.
Salary (Rate): £325 p/d
City: undetermined
Country: UK
Working Arrangements: remote
IR35 Status: outside IR35
Seniority Level: Senior
Industry: IT
Detailed Description From Employer:
Role: Senior Python Backend Developer - API Design (Fully remote Part-time contract)
Rate: £325 p/d (Outside IR35)
Duration: 15 June 2026 till end of December 2026
Workload: 110 days billable allowance (To be allocated during contract period)
Location: 100% Fully Remote (Cloud-based collaboration platform)
Eligibility: Candidates MUST be a national of a NATO member country.
The Role
We are seeking an expert Senior Python Backend Developer to design, build, and operate scalable services and data pipelines powering maritime geospatial and temporal analytics. This is a hands-on engineering role with strong end-to-end feature ownership, you will be translating complex domain models into clean, testable code using Domain-Driven Design (DDD), defining clear bounded contexts, and building production-grade APIs.
What You'll Be Doing:
- API & Microservices: Developing asynchronous, production-grade APIs and microservices using FastAPI.
- Graph Architecture: Integrating and optimizing graph-centric use cases using Neo4j and Cypher query modeling.
- Data Pipelines: Leveraging Databricks for data engineering and ML workflows.
- Feature Leadership: Leading features end-to-end-from technical discovery and design through implementation, testing, deployment, and monitoring.
What We Need From You:
- Advanced Python & FastAPI: Deep proficiency with asynchronous Python, type hints, and async best practices.
- Domain-Driven Design (DDD): Strong practical experience applying DDD principles (aggregates, bounded contexts, domain services).
- Database Expertise: Heavy hands-on experience with Neo4j (Cypher optimization) alongside strong relational SQL (PostgreSQL/SQL Server).
- Geospatial Data: Experience modeling, processing, and querying geospatial and temporal datasets.
- The Stack: Robust knowledge of Docker, event-driven systems (Kafka/MQTT), and secure coding practices (OWASP Top 10).