API Developer w Kraków, Polska

Expected, Java, Spring Boot, Maven, Kafka, OpenAI API

Optional, Postman, OpenAI API, AWS, Docker

Operating system, Windows

About the project, As an API Developer, you’ll design, build, and run secure, scalable APIs that power client’s digital products and internal platforms. Working in a cross-functional engineering team, you’ll contribute to delivering reliable, modern, cloud-native services built on Java and event-driven architecture principles., Sounds like your kind of challenge?

This is how we work, you have influence on the technological solutions applied, you focus on product development, you focus on code maintenance, agile

Team members, backend developer, technical leader, architect, devOps, manual tester

Your responsibilities, Design, build and evolve high-performing APIs and backend services using Java, Spring Boot, and Maven., Collaborate closely with product owners, architects, and testers to deliver high-quality, business-aligned solutions., Create and maintain clear API documentation (OpenAPI/Swagger) and define standards for internal and external API consumption., Design APIs following established standards (REST, GraphQL, SOAP), focusing on versioning, backward compatibility, and consumer experience., Integrate with both internal and third party APIs while ensuring resilience, observability, and robust error handling., Build event-driven services with Kafka (or similar) — from topic design to schema management and reliability patterns., Deploy cloud ready applications on AWS (EKS, Fargate, S3, RDS, Route 53)., Write automated tests, perform API testing, and troubleshoot production issues following the “you build it, you run it” principle., Collaborate on engineering standards emphasizing security, maintainability, and continuous improvement., Note: Detailed project information will be shared during the recruitment process.

Hands-on experience building APIs and backend services in Java., Solid experience with Spring Boot and build tools (e.g., Maven)., Strong understanding of backend architecture (data access, caching, resilience, service design)., Excellent knowledge of API design standards (REST, GraphQL, SOAP)., Familiarity with API testing and documentation tools (Postman, Swagger UI, OpenAPI, SoapUI)., Experience with data formats such as JSON, XML, XAML., Ability to diagnose and resolve issues, improve performance, and enhance reliability., Great communication and collaboration skills — working effectively across teams.

Optional, Experience with event-driven architecture at scale (Kafka Streams, schema registry, idempotency)., Exposure to AWS cloud infrastructure (EKS, Fargate, RDS, Route 53, etc.)., Familiarity with CI/CD, observability tools (metrics/logging/tracing)., Strong analytical thinking and a pragmatic, delivery-oriented mindset.

What we offer, Hybrid work setup – 6x/month from the office in Kraków, Collaborative team culture – work alongside experienced professionals eager to share knowledge, Continuous development – access to training platforms and growth opportunities, Comprehensive benefits – including Interpolska Health Care, Multisport card, Warta Insurance, and more, High quality equipment – laptop and essential software provided

This is how we work on a project, code review, Continuous Integration, DevOps, integration tests, test automation, unit tests

Benefits, sharing the costs of sports activities, private medical care, sharing the costs of professional training & courses, life insurance

Joining this project you’ll become part of Mindbox – a tech-driven company where consulting, engineering, and talent meet to build meaningful digital solutions. We’ll back you up every step of the way, accelerate your development, and ensure your skills make a difference.

Mindbox Sp. z o.o., At Mindbox, we connect top IT talents with technology projects for leading enterprises across Europe., Our focus is on matching your skills with work that matters – projects that use modern tech stacks, solve real business challenges, and give you space to grow. By joining us, you’ll deliver technology solutions for well-known brands, supported by the Mindbox team that values knowledge-sharing and continuous development. We make sure you have the tools, flexibility, and guidance to do your best work – and to keep moving forward in your career.