Java Developer

INCERT is a center of expertise providing services and solutions based on knowledge and experience acquired in cryptography, Public Key Infrastructure (PKI), eTravel document, biometry and artificial intelligence.        

"Established since 2012, INCERT is a public agency owned by the State of Luxembourg and the Luxembourg Chamber of Commerce. INCERT also represents and defends Luxembourg’s national interests at European and international organizations.

Further information about INCERT can be found at www.incert.lu.

Within the scope of its current activities and its incoming ones, INCERT is now recruiting a Java Developer full-time, and as a permanent position.

What you’ll work on

You’ll help build and evolve a high-impact SaaS platform delivering security-critical services:

cryptography, PKI, key management, traceability, and secure integrations.

This is not “just another backend role” — it’s about engineering trust at scale.

Your mission

- Design and develop secure and robust services at the core of our security & cryptography platform.

- Shape APIs and services used to protect identities, keys, and sensitive data.

- Contribute to platform reliability by working closely with operations to bring solutions to production and make them shine.

- Build internal tooling and automation that improves developer and operational efficiency

- Produce clear, useful documentation.

- Be part of a team where security, quality, and architecture actually matter.

What we’re looking for

We’re looking for a strong, experienced developer, with deep Java expertise and solid engineering fundamentals.

Core technical profile

You are proficient and confident in Java, and comfortable designing modern systems:

-         Backend engineering:

o  Advanced backend engineering using the Spring ecosystem.

o  Strong experience with cross-cutting concerns such as security, authentication/authorization, and request lifecycle management.

o  Deep understanding of Spring Security concepts (filters, security chains, OAuth/OIDC integration).

o  Proven use of AOP and aspect-oriented design to implement concerns like security enforcement, , auditing, tracing, and policy control.

o  Clean, maintainable code practices supported by structured logging and clear architectural boundaries.

-         Data & persistence: Hibernate/JPA, SQL databases.

-         APIs & interfaces: REST controllers, WebSockets, gRPC.

-         Frontend awareness: comfortable working with modern frameworks, especially React.

-         Strong grasp of design patterns and clean architecture.

-         Containerized environments: Docker and Kubernetes are part of your daily toolkit.

Strong differentiators (not hard requirements)

Experience or strong interest in the following will really make you stand out:

- Cryptography & security domains: PKI, key management, PKCS#11.

- Secure software design principles: confidentiality, integrity, availability.

- Messaging & data infrastructure: RabbitMQ.

- Databases: MariaDB and PostgreSQL.

- Security-first mindset in design, development, and operations.

How you work

- You’re autonomous, proactive, and well-organized.

- You enjoy solving complex problems and making sound technical decisions.

- You communicate clearly and collaborate naturally with engineers and operations.

- You act with a high level of integrity and confidentiality — security is not optional.

- You value documentation, tooling, and long-term maintainability.

Languages

- Fluent in English and French.

- Luxembourgish and/or German are a plus.

Why this role is interesting

- Real-world security & cryptography challenges.

- Modern Java stack.

- Strong collaboration between engineering and operations.

- Room to influence tooling, design, and platform direction.

- A role that values deep engineering expertise and thoughtful technical decision-making.

Soft skills

You must:   

·        Have the ability to manage complex projects, solve issues and take decisions in a timely manner;             

·        Ability to understand complex topics and to simplify them for the audience;      

·        Be curious, rigorous, responsible and have a synthetic mind;      

·        Have good verbal and written communication skills;       

·        Strong team player with the ability to work independently;        

·        Act with a high sense of confidentiality and integrity; and            

·        Be fluent in French and English. Luxembourgish and German are considered as an asset.         

Please note that a criminal record will be requested as part of the final stage of our hiring process.

We look forward to receiving your application and a letter explaining your interest in the position at the following email address: [email protected]