Senior Java Engineer

Ciklum is looking for a Senior Java Engineer to join our team full-time in Romania.

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. Together, we will work on the project leading a test-driven migration of a legacy Java EE application to a modern Spring Boot architecture, including transformation of the data layer from MySQL to MongoDB while ensuring performance parity and incremental validation.

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 and integration tests prior to implementation
• Execute incremental migration with parallel validation
• Ensure performance parity with the legacy application

Requirements:

• Strong experience building enterprise applications, REST APIs, and data access layers using Java and Spring Boot
• Ability to analyze and deconstruct legacy Jakarta EE or Java EE components including EJBs, JPA, and CDI
• Deep understanding of MySQL relational data models and query optimization
• Experience with MongoDB including NoSQL patterns, document modeling, and Spring Data
• Proven track record in TDD and writing comprehensive unit and integration test suites using JUnit, Mockito, and Testcontainers
• Experience with Python for scripting, automation, and migration tooling
• Experience leveraging LLM or AI tools for code analysis, conversion assistance, and documentation generation
• Understanding of Kafka and event-driven architectures for data synchronization
• Familiarity with Docker and Kubernetes for 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
• Enjoy radical flexibility – work remotely or from an office, your choice
• Care: Medical subscription to Regina Maria, meal tickets of 16 ron net/day worked

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.

In Romania, we welcome top-tier tech talent — whether from our Bucharest office or fully remotely. Tap into deep industry knowledge, grow your career, and make an impact in an empowering environment.

Want to learn more about us? Follow us on Instagram, Facebook, LinkedIn.

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.