Ciklum is looking for a Senior Java Engineer to join our team full-time in the Czech Republic.
We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.
About the role:
As a Senior Java Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. Seeking a developer to lead the test-driven migration of a legacy Java EE application to a modern Spring Boot architecture, including transformation from MySQL to MongoDB.
Responsibilities:
- Analyze existing Java EE components and document business logic
- Design clean, testable Spring Boot services and data access interfaces
- Plan and execute MySQL to MongoDB data model transformation
- Write unit/integration tests prior to implementation
- Execute incremental migration with parallel validation
- Ensure performance parity with legacy application
Requirements:
- Java/Spring Boot - Strong experience building enterprise applications, REST APIs, and data access layers with Spring Data
- Jakarta EE/Java EE - Ability to analyze and deconstruct legacy Java EE components (EJBs, JPA, CDI)
- MySQL - Deep understanding of relational data models and query optimization
- MongoDB - Experience with NoSQL patterns, document modeling, and Spring Data MongoDB
- TDD/Unit Testing - Proven track record writing comprehensive test suites before implementation (JUnit, Mockito, Testcontainers)
Desirable:
- Python - For scripting, automation, and migration tooling
- LLM/AI Tools - Experience leveraging AI for code analysis, conversion assistance, and documentation generation
- Kafka - Understanding of event-driven architectures for data synchronization
- Docker/Kubernetes - Familiarity with containerized deployments
What`s in it for you?
- Strong community: Work alongside top professionals in a friendly, open-door environment
- Growth focus: Take on large-scale projects with a global impact and expand your expertise
- Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications
- Endless opportunities: Explore diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies
- Care: We’ve got you covered with company-paid medical insurance, mental health support, and financial & legal consultations
- Flexibility: Balance office and remote work to fit your rhythm
- Our Offices in the Czech Republic: We have three offices in Prague, Hradec Králové, and Zlín. There are no fixed office days—it all depends on your team’s agreement.
- Here, you’ll find a relaxed and friendly atmosphere that fosters collaboration and innovation
About us:
At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress.
With delivery centers in Prague, Hradec Králové, and Zlín, our Czech team delivers end-to-end solutions across industries. Here, innovation thrives through collaboration, and every idea drives our partners' success.
Want to learn more about us?
Follow us on Instagram, Facebook, LinkedIn, stop by one of our IT meetups Nalejvárna.
Explore, empower, engineer with Ciklum!
Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum.
CZ
