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NextWave Consulting Ltd

Backend Java Developer - Birmingham • Hybrid • £50–65k • Not London

NextWave Consulting Ltd London, England, United Kingdom · £50K–£65K/yr

Business Consulting and Services · 51-200 employees

Aug 30
java Senior (5-10 yrs) Contractor United Kingdom
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About the role

Build core backend services in Java for access control, query manipulation, and deterministic policy engines. Develop production-grade, testable pipelines while contributing to architecture decisions and observability.

What they look for

Java Spring JDBC SQL Query planning Data structures Algorithms JUnit 5 Mockito Clean architecture CI/CD Docker Maven Jenkins Apache Calcite Starburst

Requirements

Requires strong hands-on experience in Java 17/21, Spring, and deep understanding of SQL parsing and query optimization. Candidates should be comfortable with clean architecture, CI/CD, and distributed data platforms.

Full description

Backend Java Developer

Location: Birmingham (Hybrid) Employment: Fixed Term Contract Salary: £50,000 – £65,000 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

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