Full Stack Developer (Java)

Job SummaryWe are seeking a highly skilled Full Stack Developer with strong experience in Java, Spring Boot, Kafka, and API Management platforms (Apigee) to build and support scalable, secure, and high-performance applications in the payments / banking domain. The ideal candidate will have hands-on experience with PayEdge or payment processing platforms, RESTful APIs, and modern front-end technologies.Key ResponsibilitiesBackend / Microservices

• Design, develop, and maintain Java-based microservices using Spring Boot
• Implement RESTful APIs and integrate with internal and external systems
• Build event-driven architectures using Apache Kafka (producers, consumers, streams)
• Ensure high availability, scalability, and performance of services
• Implement security using OAuth2, JWT, API keys, and role-based access

API Management & Integration

• Design, publish, and manage APIs using API Gateway / Apigee
• Configure API policies (security, throttling, caching, monitoring, transformation)
• Manage API lifecycle, versioning, and documentation
• Integrate APIs with PayEdge / payment gateways / core banking systems

Frontend / Full Stack

• Develop responsive UI components using Angular / React / JavaScript / TypeScript
• Integrate front-end applications with backend APIs
• Ensure cross-browser compatibility and performance optimization

Payments / Banking Domain

• Work on payment processing flows, transaction orchestration, and reconciliation
• Support integrations with PayEdge, ACH, RTP, wire, or card-based payment systems
• Ensure compliance with PCI-DSS, SOX, and regulatory standards

DevOps & Quality

• Write unit, integration, and API tests (JUnit, Mockito, Postman)
• Support CI/CD pipelines using Jenkins / GitHub Actions / GitLab
• Containerize applications using Docker and deploy to Kubernetes / Cloud
• Monitor and troubleshoot production issues

Required Skills & Qualifications

• 8 years of experience in software development
• Strong proficiency in Java (8/11/17) and Spring Boot
• Hands-on experience with Kafka and asynchronous messaging
• Experience with API Gateway solutions (Apigee preferred)
• Strong knowledge of REST APIs, JSON, OpenAPI/Swagger
• Experience with SQL / NoSQL databases (Oracle, PostgreSQL, MongoDB)
• Frontend experience with Angular or React
• Understanding of payment systems and financial services architecture

Preferred Qualifications

• Experience with PayEdge or similar payment platforms
• Cloud experience (AWS / Azure / GCP)
• Knowledge of Reactive programming (WebFlux)

Experience with Spring Security

• Exposure to event streaming, saga patterns, and distributed systems

Soft Skills

• Strong problem-solving and analytical skills
• Excellent communication and collaboration abilities
• Ability to work in Agile / Scrum environments
• Ownership mindset and attention to detail

Work Environment

• Agile / Scrum delivery model
• Fast-paced fintech or banking environment
• High-availability, mission-critical systems

TST Poland