Senior Java Backend Engineer
LegionHybrid, Bucharest, RomaniaPosted 21 March 2026
Job Description
Java Backend Engineer
Hybrid, Bucharest, Romania
JOB OVERVIEW
The Legion application is a high-performance data-driven Java enterprise application that implements sophisticated scheduling and optimization algorithms. It also provides the necessary endpoints for our Web and mobile frontend applications. As a Senior Software Engineer, you will be a member of the team responsible for the implementation and evolution of this application. You will need to be able to write secure, efficient, enterprise-quality Java code, and have a deep understanding of the techniques and technologies that are necessary for scalability and performance. You will also need knowledge and experience with data modeling and relational databases. Our application runs on AWS, so experience with containerization and cloud deployments is desirable. We're using Springboot, Hibernate, MySQL, and JSON, so familiarity with these technologies will be helpful. Frontend experience in JavaScript and Angular and/or React is a big plus.
RESPONSIBILITIES AND DUTIES
Develop features with high quality and on-time
Thorough understanding of product area
Assist with feature design along with CTO/Architect
Develop features keeping in mind best coding practices including performance and user experience
Own product quality
Test features before asking QA engineers to test
Write unit tests
Work with QA engineers to test the product end-to-end
Fix incoming bugs daily: Adhere to bug resolution goals and SLA
Be able to demo the Legion product end-to-end
Devise robust solutions that enable product engineering teams to rapidly deliver features in a scalable and performant manner
Design, build, and support applications from End to End.
Make data-driven technical decisions
Use your deep technical knowledge to debug and solve complex technical problems
Identify and resolve ambiguities in requirements in consultation with the various stakeholders
Contribute to the long-term team charter and quarterly planning
Mentor others on the team, and hold a high bar for code quality and standards by conducting design reviews, code reviews, and providing feedback
Work with QA team to make the feature as Production ready.
REQUIRED SKILLS AND QUALIFICATIONS
Bachelor's Degree in Computer Science, Engineering or related discipline
Strong individual contributor with the ability to research
3-5 years with backend technologies (Java, Spring Boot, MySQL)
3-5 years working on building multi-tenant SaaS applications
3-5 years experience with designing and building APIs
3+ years delivering software in a cloud-based environment (AWS, GCP, Azure)
Professional software development experience
Proficiency in Java or C++, and object-oriented design skills
Application architecture and design patterns
Experience serving as technical lead throughout the full software development lifecycle, from conception, architecture definition, detailed design, scoping, planning, implementation, and testing to documentation, delivery, and maintenance is preferred
Knowledge of professional software engineering and best practices for the full software development life cycle, including coding standards, code reviews, source control management, build processes, testing, and operations
Experience in the development of distributed/scalable systems and high-volume transaction applications
Proven ability to lead projects from inception to production
Strong mastery in communication skills, software architecture design, writing technical documents
Strong personal work ethic focused on prioritization, being action-oriented, and being driven to achieve positive results
PREFERRED QUALIFICATIONS AND ATTRIBUTES
Proactive and able to command respect through intelligence, hard work, and persistence
Personal passion and fervor for industry-leading next-generation technology
Ability to operate in an environment with limited resources
A great communicator who can distill powerful messages that resonate with c ... (truncated, view full listing at source)
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