Expert Full Stack Java Developer – Microservices & Cloud Integration

As a Senior API Engineer, you will help transform payment processing through reusable, cloud-enabled microservices that deliver next-generation payment capabilities. You will contribute to product innovation, performance optimization, and financial services for a global audience.

Quick Facts

• Hybrid work model
• Krakow-based opportunity
• Fluent English required
• Candidates must have an existing legal right to work in the European Union

Your Main Responsibilities

• Provide engineering expertise to develop and implement best-in-class payment processing capabilities aligned with Future State Architecture.
• Produce high-quality code artifacts, ensuring adherence to quality standards and comprehensive testing.
• Deliver highly available, resilient, and scalable software and services.
• Collaborate within a cross-functional delivery team, supporting modernization and cloud adoption initiatives.
• Lead by example in software delivery, setting high standards for code quality and process excellence.
• Identify process improvements, mitigate risks, and resolve technical issues proactively.
• Support the transformation of current payment systems with cloud-based solutions.
• Partner with DevOps teams to enable automated infrastructure delivery, CI/CD pipelines, and DevSecOps practices.
• Provide architecture guidance based on global standards and best practices.
• Ensure compliance with controls, standards, and security policies.
• Mentor and coach team members, fostering technical growth and knowledge sharing.

Requirements

• Minimum of 8 years’ experience as an API engineer or in back-end microservices development.
• Strong expertise in API design, low-level architecture, data modeling, and software engineering.
• Over 5 years of hands-on Java programming experience.
• Proficiency in JVM tuning, diagnostics, and performance optimization.
• Solid knowledge of distributed systems, microservices, and Spring Boot.
• Practical experience with Kafka, Docker, Kubernetes, and service meshes.
• Familiarity with monitoring and observability tools: Splunk, Grafana, Prometheus, Jaeger, Kiali, and Open Telemetry.
• Experience with cloud platforms, network configurations, IAM, and container orchestration.
• Strong SQL skills and experience working within the financial industry, particularly in payments.

Preferred Qualifications

• Experience with Go, Rust, Cucumber, and gRPC.
• Knowledge of Oracle databases.
• Mentoring or coaching background.

Language

• Fluent English, written and verbal.

Eligibility

• Only candidates with an existing legal right to work in the European Union will be considered.