NEOFACTO - Java Software Engineer
Posted
Summary
Java Software Engineer at NEOFACTO, an IT consultancy in Luxembourg, placed on client projects and owning the full SDLC: building Spring Boot 3 / Java 17+ microservices, Kafka event-driven pipelines, REST/JSON APIs, JPA/SQL data layers, Temporal workflows and test/observability suites, collaborating with React front-end developers.
We are loonking for a Java Software Engineer. You will take ownership of the full software development lifecycle, from critical, high-throughput backend services to modern web and mobile user interfaces.
Missions
Profile
Mandatory Experience & Qualifications
Preferred Experience & Differentiators
Our offer
Recruitment Process
Missions
- Architect and implement scalable, maintainable, and decoupled microservices architectures.
- Define robust, well-documented REST APIs and JSON integration contracts to ensure seamless integration with client applications (particularly React front-ends).
- Design event-driven, asynchronous data pipelines using Apache Kafka.
- Make high-impact decisions regarding system resilience, performance optimization, and architectural modularity.
- Build enterprise-grade backend services leveraging modern Java language features (Java 17/21+) and Spring Boot 3.x.
- Deconstruct and reverse-engineer complex legacy codebases: map out dependency graphs, formulate phased migration strategies, and align technical refactoring with core business priorities.
- Design relational database schemas and optimize data access layers (JPA/SQL).
- Orchestrate long-running, distributed business workflows using engines like Temporal.
- Drive software quality and test coverage through robust unit, integration, and mocking suites (JUnit/TestNG, Mockito).
- Implement modern observability patterns (Spring Boot Actuator, distributed tracing, metrics).
- Work in an Agile/Scrum environment, participating actively in sprint ceremonies, architectural spikes, and code reviews.
- Collaborate with frontend engineers to streamline API integration and UI/UX synchronization.
Profile
Mandatory Experience & Qualifications
- 7+ years of professional software engineering experience with enterprise Java and modern Spring Boot applications (Java 17 required; Java 21+ strongly preferred).
- Solid experience designing and coding complex applications, with an emphasis on microservices, modular backend design, clean APIs, and frontend-backend integration patterns (React + Spring Boot).
- Deep expertise in REST services, JSON-based integration patterns, and event-driven architectures with Apache Kafka.
- Solid, hands-on experience working with relational databases (data modeling, query optimization).
- Strong familiarity with Agile/Scrum delivery and fluent professional English (written and spoken).
Preferred Experience & Differentiators
- Proven ability to analyze complex legacy codebases, identify dependency networks, design pragmatic migration roadmaps, and justify architectural decisions to business stakeholders.
- Experience with Spring Framework 6.x and Spring Boot 3.x (Actuator, Observability, and optional GraalVM native compilation).
- Practical experience with JPA / Hibernate.
- Strong proficiency with JUnit/TestNG and mocking frameworks like Mockito.
- Hands-on experience with the Temporal workflow orchestration engine.
- Basic understanding and working knowledge of React.
Our offer
- Working in a Great Place to Work based in Luxembourg
- Attractive salary and pretty cool benefits (meal vouchers, mobile subscription...)
- Develop your skills and ideas over a coffee, a beer or a pizza during our Neo'vations
- Evolve within a strong company culture, you'll join us for the opportunity and you'll stay because we're super cool (well according to 98% of our employees NEOFACTO Annual Survey 2024)
- Between afterworks, innovative workshops and ski weekends, there's never a dull moment when you're part of the Neo'Squad
Recruitment Process
- The pre-qualification interview with our Recruitment Manager
- Technical tests
- Receipt of our salary proposal / exclusivity agreement
- Proposal of your application to the client
- Interview at the client's premises, which can be conducted either by video or in person