Senior Java Microservices Engineer – Payments (IKP | Service Mesh)

We are looking for a Senior Java Microservices Engineer to design and build high-throughput, low-latency payment systems using modern microservices architecture on IKP (Kubernetes-based platform). You will play a key role in developing scalable, secure, and resilient payment services, leveraging Service Mesh capabilities for enhanced communication, observability, and security across distributed systems.

Job Title

Senior Java Microservices Engineer – Payments (IKP | Service Mesh)

Location

Sheffield, UK

Duration

6-12 Months

Experience

5-10

Key Responsibilities

• Design, develop, and maintain Java-based microservices for end-to-end payment processing.
• Build REST/gRPC APIs and event-driven services supporting critical payment flows such as:
  • Payment initiation
  • Validation
  • Routing
  • Clearing & settlement
• Implement resilience patterns including timeouts, retries, circuit breakers, and bulkheads.
• Leverage Service Mesh capabilities (traffic routing, mTLS, observability, policy enforcement) to improve service reliability and security.
• Optimize systems for high performance and scalability (low latency, high throughput, concurrency handling).
• Ensure idempotency, fault tolerance, and safe retries in distributed systems.
• Implement payments-grade controls such as auditability, traceability, and non-repudiation.
• Collaborate with product, architecture, and SRE teams to deliver secure-by-design systems.
• Code reviews
• Automated testing

Required Technical Skills

• Strong hands‑on experience in Java (preferably Java 11+) and microservices architecture.
• Experience working on IKP or Kubernetes-based platforms.
• Solid understanding of Service Mesh concepts:
  • Traffic management
  • mTLS
  • Sidecars
• Strong knowledge of microservices design patterns:
  • Domain‑Driven Design (DDD)
  • Backward compatibility
• Experience with event‑driven architecture and messaging systems (e.g., Kafka).
• Understanding of message delivery guarantees (at‑least‑once vs exactly‑once).
• Experience implementing observability solutions:
  • Distributed tracing
  • Metrics
  • Structured logging (e.g., OpenTelemetry)

Preferred / Nice‑to‑Have Skills

• Frameworks: Spring Boot / Quarkus
• Build tools: Maven / Gradle
• Security: OAuth2, OIDC, JWT, mTLS, secrets management
• Testing: Unit, integration, contract testing (e.g., Pact), performance testing

Payments Domain Experience (Highly Preferred)

• Strong understanding of payment processing lifecycle:
  • STP (Straight Through Processing)
  • Routing
• Familiarity with payment standards/rails:
  • ISO 20022
  • SEPA
  • Faster Payments
  • ACH
• Knowledge of risk & compliance controls:

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