Java Developer - Payments

Java Microservices Payments JD

Job Title

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

Role Purpose

Build and evolve high-throughput, low-latency payment services using Java microservices on IKP, leveraging Service Mesh capabilities for secure, observable, resilient service-to-service communication. Deliver scalable APIs and event-driven components that support critical payment journeys (e.g., initiation, validation, routing, clearing/settlement, exceptions).

Key Responsibilities (Payments + Microservices Focus)

● Design, develop, and maintain Java-based microservices supporting payment processing and orchestration.

● Build REST/gRPC APIs and event-driven services for payment flows and downstream integrations.

● Implement resilience patterns (timeouts, retries, circuit breakers, bulkheads) aligned to platform standards.

● Use Service Mesh features (traffic management, mTLS, policy enforcement, observability) to improve reliability and security.

● Engineer for performance and scale: throughput, latency, idempotency, concurrency, back-pressure, and safe retries.

● Apply payments-grade controls: auditability, traceability, non-repudiation, and strong operational monitoring.

● Collaborate with product, architecture, SRE/platform teams to deliver secure-by-design services on IKP.

● Drive engineering excellence: code reviews, automated testing, CI/CD, and continuous improvement.

Required Technical Skills (Core)

● Strong hands-on Java (modern versions preferred) and microservices design.

● Experience building services on IKP (or equivalent internal Kubernetes-based platform).

● Solid understanding of Service Mesh concepts and implementation (traffic routing, mTLS, sidecars, service discovery).

● Microservices patterns: DDD, API versioning, contract-first development, backward compatibility.

● Data and messaging: Kafka (or equivalent), event schemas, exactly-once/at-least-once trade-offs, idempotency.

● Observability: distributed tracing, metrics, structured logging (e.g., OpenTelemetry patterns).

Preferred / Nice-to-Have (Common Adjacent Tech)

(Adjust to match your environment)

● Spring Boot / Quarkus, Maven/Gradle

● Containers & orchestration: Docker, Kubernetes

● API tooling: OpenAPI/Swagger, API gateways

● Security: OAuth2/OIDC, JWT, secrets management, mTLS

● CI/CD: pipelines, automated quality gates, SAST/DAST

● Testing: unit/integration/contract tests (e.g., Pact), performance testing

Payments Domain Experience

● Knowledge of payment processing concepts: STP, validation, enrichment, routing, reconciliation, exception handling

● Familiarity with payment rails/standards: ISO 20022, SEPA, Faster Payments, ACH

● Understanding of operational risk controls: limits, sanctions screening touchpoints, audit trails, and regulatory considerations.

Ways of Working

● Agile delivery, strong stakeholder management, and cross-team collaboration.

● Ownership mindset: you build it, you run it (production support, incident learnings, post-mortems).