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.

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

• 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 secu