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NextWave is a boutique digital acceleration consultancy where the advertised roles are for client-facing billable projects rather than internal corporate functions.

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Posted 4mo ago

Backend Java Developer – Data Fabric / Platform Engineering

@ NextWave Consulting
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London, England, United Kingdom
£70k-£90k/yrHybridFull Time
Responsibilities:Build backend, Implement policy engines, Improve observability
Requirements Summary:Strong Java (17/21) with Spring, JDBC, SQL parsing/validation, query planning/optimization; experience with Docker, Maven, Jenkins; production-grade testing (JUnit 5, Mockito); CI/CD, observability; clean architecture.
Technical Tools Mentioned:Java, Spring, JDBC, SQL, Calcite, Maven, Jenkins, JUnit 5, Mockito, Docker, CI/CD
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Job Description

Backend Java Developer – Data Fabric / Platform Engineering


Location: London (Hybrid)
Employment: Permanent
Salary: £70,000 – £90,000 base (dependent on experience)


If your idea of backend engineering is more than CRUD APIs and microservices boilerplate — this role is for you.


We’re building the core backend services of a Data Fabric platform that governs data access, entitlements, and query policy enforcement across distributed enterprise data systems.
This is platform engineering: deterministic rule engines, SQL planning/interception, and high-throughput services that sit on the critical path of data access.

This is deep backend + data infrastructure work.

🚀 What You’ll Do

  • Build core backend services in Java (17/21) for access control and query manipulation
  • Implement deterministic policy / rule engines for data governance
  • Work on SQL parsing, planning, validation, and transformation (e.g., Calcite or similar planners)
  • Integrate with distributed data platforms / query engines (e.g., Starburst or similar)
  • Own API contracts with living documentation in CI/CD
  • Build production-grade, testable pipelines
  • Drive observability, reliability, and performance
  • Contribute to architecture decisions (modularity, DI, extensibility)

 What You Bring (Must-Have)

  • Strong hands-on experience in Java (17/21) + Spring
  • Deep understanding of JDBC, SQL parsing/validation, query planning/optimization
  • Experience with SQL planners or query transformation layers
  • Strong grounding in data structures, algorithms, and backend performance
  • Production-grade testing using JUnit 5, Mockito
  • Experience with clean architecture, DI, modular design
  • Comfortable owning CI/CD, code quality, observability
  • Familiarity with Docker, Maven, Jenkins

⭐ Nice to Have

  • Apache Calcite
  • Starburst or federated query engines
  • JVM performance tuning
  • High-throughput service interfaces (REST/gRPC)
  • Data governance or policy enforcement layers

👥 This Role Is Ideal If You’ve Worked On

  • Data platforms, governance layers, query engines, or SQL planners
  • Backend/platform services that sit in the critical path of data access
  • Systems where correctness, determinism, and performance matter