API Developer

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 organize our work

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.

Our requirements

• 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.