Senior Java Developer (Spring Boot, AWS, Kubernetes)

Quick Facts

• Role: Senior Java Developer (Spring Boot / AWS / Kubernetes)

• Collaboration: B2B

• Location/Work model: Kraków (hybrid; 6 days/month in the office)

• Domain: Banking / FinTech

• Level: Senior

Description

You will join an international team to develop and modernize a communication platform by designing and maintaining backend services in Java and Spring Boot. The role focuses on microservices, REST API development aligned with OpenAPI 3.0 and Swagger, and running solutions in AWS and Kubernetes. You will also strengthen CI/CD automation, uphold security/quality standards, and mentor other engineers.

Responsibilities

• Design, develop, and maintain Java/Spring Boot backend applications

• Build and evolve scalable microservices-based distributed systems

• Implement REST API interfaces following OpenAPI 3.0 and Swagger standards

• Develop and maintain services running on AWS and Kubernetes

• Modernize existing components and implement new technological solutions

• Improve CI/CD processes and automate deployments

• Write unit and automated tests using a TDD approach

• Perform code reviews; ensure code quality, security, and performance

• Collaborate with technical and business teams on requirements and solution design

• Mentor less experienced team members and share knowledge

• Ensure solutions comply with security and quality standards required in the banking sector

Requirements

• Advanced commercial experience in Java and Spring Boot

• Practical experience with AWS and Kubernetes

• Very good knowledge of microservices architecture and distributed systems

• REST API design/implementation experience; Swagger, OpenAPI 3.0, JSON

• Knowledge of authentication/authorization mechanisms, especially OAuth 2.0

• CI/CD experience: Jenkins (Shared Libraries), GitHub, Maven, Groovy

• Knowledge of Kong API Gateway

• Practical TDD experience, unit tests, and software engineering best practices

• Experience in Agile/Scrum teams

• Ability to analyze business requirements and translate them into technical solutions

• Independence, responsibility, and ability to solve complex technical problems

• Ability to work with international teams and stakeholders

Benefits

• Long-term B2B cooperation

• Work on modern technology platform development for an international banking organization

• Hybrid model: 6 days per month from the Kraków office

• Opportunity to work with modern cloud-focused stack and technologies

• Real impact on technical decisions, architecture, and system quality

• Collaboration with experienced engineers in an international environment

• Growth opportunities through technical development and participation in modernization of a large platform