Senior Java Engineer

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
• 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 Confidencial (Apenas para Cadastrados), 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.

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Explore, empower, engineer with Confidencial (Apenas para Cadastrados)!

Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Confidencial (Apenas para Cadastrados).

C#

Java

Mongodb