API Developer

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

We’re seeking an API Developer with strong Java expertise to work within a cross-functional engineering team, responsible for delivering secure, high-performing services at scale. You’ll be working with modern Java, Spring Boot, and cloud-native patterns including API-first design and event-driven architecture on AWS.

Sounds like your kind of challenge?

#LI- Hybrid – 8 days per month from the office in Kraków

What you’ll be doing

Design, build, and maintain scalable APIs and backend services using Java, Spring Boot, Maven
Collaborate closely with product owners, architects, and testers to deliver high-quality, business-aligned solutions
Design APIs following industry standards (REST, plus GraphQL/SOAP where applicable) ensuring versioning, backward compatibility, and resilience
Integrate internal and third-party APIs with robust error handling and observability
Build event-driven services with Kafka or similar: manage topics, schema evolution, and message reliability
Deploy on AWS using EKS/Kubernetes, Fargate, Redis, RDS, S3, Route 53
Maintain quality through automated testing, performance tuning, and production support in line with the “you build it, you run it” principle
Produce API documentation using OpenAPI/Swagger and update runbooks as needed
Contribute to security-by-design practices and continuous improvement

Note: Detailed project information will be shared during the recruitment process.

What you get in return

Flexible cooperation model – choose the form that suits you best
(B2B, employment contract, etc.)
Hybrid work setup – 8 days per 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

Who we’re looking for

Proven back-end development experience in Java
Strong hands-on expertise with Spring Boot and build tools (e.g., Maven)
Solid knowledge of API architecture and integration patterns (REST, GraphQL, SOAP)
Experience with common API tools like Postman, Swagger/OpenAPI, SoapUI
Familiar with data formats (JSON, XML) and backend fundamentals (caching, resilience, service design)
Ability to diagnose issues, optimize performance, and deliver reliable solutions
Great collaboration skills and clear technical communication

Nice to Have

Experience with event-driven architecture and Kafka at scale
Familiarity with AWS cloud services (Kubernetes/EKS, Fargate, Redis, RDS, S3, Route 53)
Understanding of modern CI/CD pipelines, security practices, and observability tools
Strong analytical mindset with a pragmatic, delivery-focused approach

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.

API Developer

Kraków

B2B

1350-1650 PLN/MD netto + VAT

Apply for position

I will handle your recruitment

Jolanta Gmurczyk

SUPPORT & BENEFITS

Private healthcare

Fast access to doctors and medical tests.

Mindbox fully covers the individual package. You can extend the coverage to your partner and family on preferential terms. A wide network of medical providers and clear rules for everyday use.

Multisport

Energy that pays off.

We cover 50% of the card cost. You get access to thousands of sports facilities across Poland, plus a convenient mobile app. Additional cards for family members are available.

Training & development

Practical support for your career growth.

We co‑fund courses, certifications and conferences under a clear Training Policy. You also get access to a library of recorded webinars and trainings – available whenever you need them.

Eyewear or contact lenses co‑funding

Clear vision means comfortable work.

Up to PLN 500 every two years, with an additional PLN 300 available in justified cases. Simple reimbursement, regardless of your form of cooperation.

Group life insurance

Real protection from day one.

Option I is fully funded by Mindbox, Option II is co‑funded. You can include your partner and adult children, with coverage that also applies to treatment and hospitalisation abroad.

Ongoing support from the Talent Network Development

You’re not on your own in a project.

Regular contact, quick response and a partnership‑based approach. You focus on your work — we help take care of the rest.

Regular integration meet‑ups

Relationships that work beyond the project.

Cyclical meet‑ups for contractors in major cities across Poland. A space to talk, exchange experience and stay in real contact with the Mindbox team.

Annual company‑wide integration

One event. The whole community.

A two‑day company gathering with accommodation, transport and a full activity programme. Time to connect teams from across Poland and build shared experiences.