Expert Java API Engineer - Payment Processing

Unleash the future of payments - engineer resilient, cloud-ready platforms that power next-generation financial services!

Krakow-based opportunity with hybrid work model.

As an Expert Java API Engineer, you will be working for our client in the financial services industry, helping deliver a future-state architecture for payment processing. You will build lean, reusable payment capabilities focused on high availability, resilience, modernization, and cloud adoption-enabling new products to reach customers faster, with greater quality and efficiency.

Your main responsibilities

• Deliver engineering expertise for future-state payment processing architecture.
• Design, develop, test, debug, and document high-quality software and API solutions.
• Build highly available and resilient payment processing services using modern microservice architectures.
• Produce architectural artefacts, technical alternatives, data models, and low-level designs.
• Partner with DevOps teams to enable automated infrastructure delivery, DevSecOps value streams, and CI/CD pipelines.
• Provide technical leadership, architecture guidance, mentoring, and consultation to development teams.
• Identify and resolve complex architectural, development, technical, and business issues.
• Support the modernization of the payment estate while ensuring compliance with relevant controls, standards, cybersecurity, and data privacy requirements.

You're ideal for this role if you have

• A Bachelor’s degree in Computer Science, Engineering, or a related field.
• 15+ years of applied experience as an API Engineer and 10+ years of software engineering experience.
• 10+ years of programming experience in Java.
• Expert knowledge of distributed systems, microservices, and Spring Boot.
• Strong expertise in Docker, Kubernetes, service mesh, Kafka, and Kubernetes CNI.
• Experience with API design, application security, authentication, caching, middleware, and architectural documentation.
• Expertise in JVM tuning, diagnostics, troubleshooting, and performance optimization.
• Practical knowledge of cloud and DevOps technologies, including VPC/firewall, IAM, cloud sizing and costing, monitoring, and observability tools such as Splunk, Grafana, Prometheus, Jaeger, Kiali, and OpenTelemetry.

It is a strong plus if you have

• Experience with Go and Rust programming languages.
• Expert-level SQL coding abilities.
• Experience working in a financial institution, ideally within payments.
• Experience with distributed databases.

Language Required for the role: Fluent English, both written and verbal.

Eligibility for the role: Only candidates with an existing legal right to work in Europe will be considered for this role.

#MAKEYourCareerBETTER

Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.