Senior Java Engineer (Payments)

• Practical, day-to-day use of AI coding assistants and LLMs as part of the development workflow — for implementation, refactoring, test generation, debugging, and documentation — combined with the engineering judgement to review and validate what they produce for correctness, security, and maintainability. We use these tools heavily across everything we build, and we expect them to be directed by an engineer who knows when the output is wrong.

• Hands-on experience building or operating payments or fintech systems — card issuing, acquiring, processing, authorization, settlement, cross-border, or equivalent. You should be comfortable with the realities of money movement: idempotency, reconciliation, transaction lifecycles, and the regulatory constraints that come with them.

• Strong knowledge of Java 21/25 (LTS) and Spring Boot 4 / Spring Framework 7, building RESTful and event-driven microservices.

• Solid experience with Apache Kafka and asynchronous processing, including idempotency and exactly-once semantics.

• Experience with relational databases (PostgreSQL, MySQL) and ORM frameworks (Hibernate, JPA).

• Strong API design skills (REST, OpenAPI) and integration best practices.

• Confident with modern build tooling — Gradle and Maven — and with CI/CD pipelines (GitHub Actions, Helm, Terraform).

• Hands-on experience with AWS, Docker, and Kubernetes.

• Strong testing discipline (JUnit 5, Mockito, Testcontainers) and production observability (OpenTelemetry, Prometheus, Grafana).

• Experience mentoring engineers, leading code reviews, and working in distributed teams.

Nice to have

• Depth in payments standards and protocols: ISO 20022, ISO 8583, EMV, 3-D Secure, or scheme certification.

• Depth in security: encryption, OAuth2/OIDC, JWT, mTLS, HSM integration, tokenization.

• Infrastructure-as-code and platform engineering experience.

• Experience working directly with enterprise clients in a consultancy or professional-services setting.

What we value

• Precision & reliability — software that meets the highest standards for performance and accuracy.

• Security-first mindset — applying strong security practices throughout the development process.

• Adaptability — moving between domains, clients, and problem spaces without losing momentum.

• Collaboration — working effectively with technical and business stakeholders across teams and geographies.

• Ownership & accountability — taking initiative to deliver high-quality, production-ready code.

• Technical leadership — lifting the standard of the whole team, not just your own output.

• Curiosity & innovation — staying current with emerging trends across the payments industry.

About Payforge

Payforge is a specialist professional-services company focused exclusively on payments and fintech. We help clients deliver high-quality, scalable technology solutions in an evolving global financial landscape — including some of the most established names in the industry.

Equal Opportunity Statement

Payforge is proud to be an equal-opportunity employer. All qualified applicants will receive consideration without regard to race, colour, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. We welcome applicants from all backgrounds.

Originally posted on Himalayas

• Senior Java Engineer
• Backend Engineer
• Software Engineer
• Payments Engineer

Source: Himalayas