The Role
You’ll be part of a cross-functional data team for our client in the healthcare technology industry. The team plays a central role in connecting multiple product domains by building and maintaining a new GraphQL API layer that streamlines data integration and communication. The work follows an agile approach and uses modern Java technologies within an established, large-scale platform that continues to evolve.
What you will do

• Design and build well-structured, versioned GraphQL APIs and internal services with clean contracts and strong performance.
• Take full ownership of services from domain modeling and persistence to deployment, monitoring, and optimization.
• Ensure quality by default through comprehensive unit, integration, and contract testing.
• Participate in code reviews and promote best practices in secure, maintainable coding.
• Optimize JVM-based services for performance and reliability using caching, pagination, circuit breakers, and other patterns.
• Implement and maintain security measures including OAuth2/OIDC, secrets management, and audit logging.
• Collaborate closely with Product, QA, and DevOps teams on planning and delivery.
• Mentor team members and contribute to the overall technical roadmap and standards.
  

Requirements

• Solid experience developing production-grade services in Java (11+), with strong understanding of concurrency, collections, and JVM internals.
• Proficiency in Spring Boot (WebFlux/MVC), Spring Security, and Spring Data, or equivalent frameworks.
• Strong experience designing and implementing RESTful and GraphQL APIs, including pagination, filtering, idempotency, and versioning.
• Hands-on experience with SQL (PostgreSQL/MySQL) and NoSQL databases (e.g., Redis, MongoDB), including schema design and query optimization.
• Experience with Kafka or RabbitMQ for messaging/event-driven architectures.
• Familiarity with CI/CD pipelines (GitHub Actions, GitLab, Azure DevOps) and cloud platforms (AWS, Azure, or GCP).
• Understanding of observability tools (Prometheus, Grafana, ELK, OpenTelemetry) and implementing metrics, tracing, and alerting.
• Strong testing mindset using JUnit 5, Testcontainers, WireMock/MockServer, and contract testing (e.g., Pact).
• Knowledge of security best practices — OAuth2/OIDC, JWT, TLS, OWASP Top 10, and IAM fundamentals.
  

What we offer

• Hybrid/flexible working model and flexible working hours
• Private Medical and/or Health Insurance (location dependent)
• Length of Service Awards
• Referral programme
• The option of a cafeteria package, meal tickets, or team lunches (location dependent)
• A culture of continuous growth, supported by our People Lead system and various training resources for your personal development
• Agile mindset, simplified processes, and a great atmosphere where commitment and autonomy are celebrated
• A community-first mindset, working with talented people across technology products and consulting
• Charity events and programs
  

Additional benefits based on location:
Hungary
Extensive cafeteria package tailored to your needs (including SZÉP card)
Romania
Bookster library subscription, and the opportunity to work from abroad (max. 60 days per annum)
(*) As we hire permanent employees for this role, we offer remote opportunities only in Romania and Hungary.
About Us
Zenitech is a leading technology solutions provider dedicated to reshaping the global digital landscape. Headquartered in the UK, Zenitech operates internationally, with offices in Lithuania, Romania, and Hungary.
We use a bespoke approach depending upon where the client is on their digital journey, comprising a combination of access to dedicated R&D labs, technology implementation advice, and specialist nearshore development talent. As an international community of individuals who are open to learn from each other, we collectively define and input into the digital future of the clients’ businesses.
Why Zenitech?

• Impactful Projects: Drive meaningful change through digital transformation projects and have an opportunity to make an impact on many different industries.
• Collaborative Culture: Be part of a diverse, inclusive team committed to growth, innovation, and continuous learning.
• Professional Growth: Zenitech supports continuous learning and development through the People Lead system, helping you advance your skills and career.
  

Diversity and Inclusion
Zenitech celebrates diversity in all its forms. We aim to create an inclusive environment where everyone feels valued for their unique contributions and perspectives. If you require any adjustments during the application process, please let us know—we’re here to help. Our commitment to diversity, equity, inclusion, and belonging can be found here.
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