Back-End Engineer - Java (Payments)

Poland - Warsaw · Poland · 5-10 years experience · Hybrid · Posted Oct 20, 2026

At a glance

Capco Poland is looking for an experienced Back-End Developer to provide specialist development services for a project within the financial services and payments industry.
This engagement offers the opportunity to apply Java and Spring Boot expertise, work with PostgreSQL and AWS cloud technologies, and deliver reliable, scalable, and high-performance solutions.

Design, develop, and deliver scalable, secure, and high-quality back-end services using Java 25 and Spring Boot 4.
Collaborate with the Agile Team, including developers, product owners, QA engineers, and other stakeholders, to coordinate technical activities and deliver agreed project outcomes.
Develop and maintain RESTful APIs, microservices, and integrations with PostgreSQL databases and AWS cloud services.
Deliver clean, maintainable, and testable code, contributing to technical reviews and applying established engineering standards.
Analyse and resolve technical challenges, optimise application and database performance, and contribute to improvements in system reliability, security, and scalability.

Around 5–10 years of hands-on expertise in Java and Spring Boot, including knowledge of Java 25 and Spring Boot 4.
Strong understanding of object-oriented programming, microservices architecture, RESTful APIs, and modern back-end development principles.
Practical experience with PostgreSQL, including database design, SQL query optimisation, and efficient data management.
Hands-on experience with AWS cloud services and developing or integrating cloud-based applications.
Ability to deliver technical solutions independently while collaborating effectively with cross-functional teams in Agile or Scrum project environments.

Experience delivering technology solutions within financial services, payments, or transaction-processing environments.
Familiarity with AWS services such as ECS, EKS, Lambda, RDS, S3, or CloudWatch.
Experience with containerisation technologies such as Docker and Kubernetes, alongside CI/CD pipelines and automated deployment processes.
Knowledge of automated testing frameworks such as JUnit, Mockito, and integration testing tools.
Understanding of event-driven architecture, messaging technologies such as Kafka, and application monitoring and observability practices.

B2B cooperation in a hybrid model
Option to provide services from the Warsaw office to the extent agreed based on project needs

Show all 15 skills