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Romania Remote Java

Senior Java Developer

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Description

Ciklum is looking for a Senior Java Developer 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 Developer, become a part of a cross-functional development team engineering experiences of tomorrow and the one who brings deep expertise in backend development using Java 8+, Spring Boot, and microservices architecture. This role requires hands-on experience with Java Streams, RESTful API design, and secure communication practices including TLS/mTLS. You will be responsible for building scalable, maintainable, and production-ready applications and services, while mentoring junior developers and advocating for best engineering practices.

Responsibilities

  • Design, develop, and maintain backend services using Java (Java 8+) and Spring Boot
  • Build and expose RESTful APIs (e.g., weather API) following REST standards
  • Apply microservices principles to architect and decouple complex systems
  • Implement circuit breakers using tools such as Resilience4j to ensure resilience in distributed systems
  • Handle exceptions effectively using Spring’s @ControllerAdvice, and configure fallback mechanisms
  • Use Java Streams for complex data transformations:
    • Implement operations like flatMap, sorted, collect, and groupingBy with custom collectors
    • Solve code problems such as counting word occurrences or flattening nested lists
  • Configure Servlet-based error handlers for low-level HTTP exception handling
  • Ensure secure communication using TLS/mTLS, and manage trust stores/key stores configurations for encrypted data exchange
  • Participate in code reviews, provide constructive feedback, and ensure quality, security, and performance of deliverables
  • Collaborate with cross-functional teams to deliver production-ready features and troubleshoot production issues
  • Proactively address technical debts, enforce best practices, and write clean, testable code
  • Mentor junior developers and support their technical growth

Requirements

  • Strong proficiency in Java 8+, including hands-on experience with Streams API and lambda expressions
  • Solid understanding of Spring Boot internals and REST API development
  • Deep experience with microservices architecture, including service registration/discovery and fault tolerance patterns
  • Familiarity with Resilience4j or similar libraries (Hystrix, etc.) for resilience
  • Strong grasp of exception handling, particularly using @ControllerAdvice, @ExceptionHandler
  • Experience using Servlet error handling mechanisms
  • Practical experience with Java Stream operations for real-time data processing
  • Knowledge of TLS, mTLS, and configuring keystores/truststores for secure data communication
  • Understanding of CI/CD, logging, monitoring, and deploying Java-based services in production
  • Good knowledge of unit testing, integration testing frameworks (e.g., JUnit, Mockito)
  • Strong debugging and problem-solving skills

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!

Experiences of tomorrow. Engineered together

Interested already?

We would love to get to know you! Submit your application. Can’t wait to see you at Ciklum.

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