API Developer

At Mindbox we connect top IT talents with technology projects for leading enterprises across Europe.

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?

#LI - Hybrid: 6/month form the office in Kraków

What you'll be doing

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.

What you get in return

Hybrid work setup – remote days available depending on the client’s arrangements
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

Who we're looking for

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.

Nice to have

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.

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.

Ready to take the next step?

Submit your application! We look forward to reviewing your profile 😊

Know someone who might be a great fit?
Feel free to share this opportunity using the referral link: Mindbox Referrals System