About Cronos Europa Portugal

Cronos Europa Portugal is the Lisbon delivery centre of Cronos Europa, part of the Cronos Group — a technology federation of 9,000+ professionals and 600+ competence centres across Europe. From our office at IDB Lisbon we deliver application development, architecture, and IT operations for major European organisations, working as an integrated nearshore extension of our clients' teams.

This position is with Cronos Europa Portugal: the person contracts directly with us, as an employee or as a B2B contractor, joins our Lisbon team and is assigned to a long-term client engagement.

About the client

A major European organisation operating mission-critical aviation systems

The client's engineering teams work closely with its functional experts to make European aviation safer and more efficient. They build a wide variety of data-driven solutions that combine operational expertise, technical expertise and uniquely valuable European aviation data.

The solutions run mainly on Microsoft Azure and are deployed through Azure DevOps pipelines. Teams follow SAFe / Agile. AI-assisted development is part of how the teams work, and the client values demonstrated experience over familiarity with the concepts.

The role includes regular work on site at the client in Brussels: about 30 working days per year, typically 5 consecutive working days every 2 months. There is some flexibility in how these days are spread. Candidates must accept this from the start.

About the Role

We are looking for senior Backend Developers to join one of the client's development teams and build and run the services behind its solutions.

The current stack is Java and Spring Boot, running on Microsoft Azure and deployed through Azure DevOps.

The shape of the profile

A senior Java / Spring Boot engineer who designs, builds and runs services in production - and closely matches every technical requirement below.

The client prefers full stack developers. Backend candidates are considered when they are strong and match the technical requirements closely: Java and Spring Boot, Azure and Azure DevOps, PostgreSQL and Oracle, and several architectural styles.

Key Responsibilities

BUILD

Design and build backend services and APIs
Integrate with other systems through well-defined contracts
Design and evolve the data model for each solution

ENGINEERING PRACTICE

Apply clean code, automated testing, continuous integration and deployment
Take part in design and code reviews

RUN

Run your services in production: monitoring, alerting, incident response

WORKING IN THE TEAM

Refine requirements with the Product Owner and functional experts, and assess technical feasibility
Review requirements, challenge assumptions when needed, and raise concerns about feasibility or clarity

Requirements

MANDATORY

5+ years building production backend services with Java and Spring Boot
Strong software design and enterprise integration patterns, with the judgement to pick the right one or keep it simple
Experience with several architectural styles - for example hexagonal, modular monolith, microservices, event-driven
Hands-on Microsoft Azure and Azure DevOps
Data modelling and database design - PostgreSQL and Oracle
Solid delivery practice: automated testing, quality gates, DevSecOps
Experience in SAFe / Agile teams
Experience with AI-assisted development, including handling the problems it introduces
Fluent English, written and spoken - see the language requirement below

SENIORITY

Senior - minimum 5 years building production backend services with Java and Spring Boot.

LANGUAGE - HARD REQUIREMENT

Fluent English, written and spoken, is mandatory - C1 is the level we are aiming for. All project work, documentation and meetings happen in English with an international team. French is a plus.

PREFERRED / ADDED VALUE

Event-driven systems - Kafka, Azure Service Bus
Cosmos DB
Performance testing
Some front-end experience (React / TypeScript) - brings the candidate closer to the preferred full stack profile
French

Informations

Contract Direct with Cronos Europa Portugal: employment or B2B contractor, no intermediaries
Engagement Full-time
Location IDB Lisbon - Praca Jose Queiros, 1, Bloco C, 4.o andar
Office presence Minimum 3 days per week on site
Travel About 30 working days per year on site in Brussels (typically 5 consecutive days every 2 months)
Start Expected from January 2027 (to be confirmed)

Why Cronos Group?

We'll propose you:

An attractive salary package
A good work-life balance environment
The assurance of working in cutting-edge technologies in an entrepreneurial spirit.
The opportunity to develop your skills thanks to tailor-made training courses according to your needs
A good job in a friendly place

If you wish to integrate a dynamic structure on a human scale while working with the latest technologies, don't wait anymore and join Cronos!

Backend Developer (Java / Spring Boot)

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