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Full Stack Developer (Java / Spring Boot + React)

Cronos Europa

Skills

Required

  • Java / Spring Boot
  • React / TypeScript
  • automated testing
  • AI-assisted development
  • French
  • software design
  • enterprise integration patterns
  • architectural styles
  • quality gates
  • DevSecOps

Preferred

  • Microsoft Azure
  • Azure DevOps
  • backend
  • web front-ends
  • PostgreSQL
  • Oracle

We are looking for senior Full Stack Developers to join one of the client's development teams and deliver features end to end, from the user interface to the backend services and the data.

About Cronos Europa

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.

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.

Responsibilities

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

The shape of the profile

  • A senior engineer who delivers a feature from the database to the screen: Java / Spring Boot on the back end and React / TypeScript on the front end.
  • Both tiers at a professional level. A CV that is all front end with Java only as a side note, or all back end with no real React work, does not fit this profile.
  • The client also values good interface design: clear, consistent and easy-to-use screens, even for applications with complex data.
  • Design and build backend services and the web front-ends that use them

Integrate with other systems through well-defined contracts

  • Design and evolve the data model for each solution
  • Apply clean code, automated testing, continuous integration and deployment

Take part in design and code reviews

  • Run your features in production: monitoring, alerting, incident response
  • 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
  • 5+ years building production applications with Java / Spring Boot and React / TypeScript
  • Hands-on Microsoft Azure and Azure DevOps
  • Data modelling and database design - PostgreSQL and Oracle
  • Aviation or air traffic management background

Requirements

  • Strong software design and enterprise integration patterns, with the judgement to pick the right one or keep it simple
  • Experience with several architectural styles on both tiers
  • 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
  • Senior - minimum 5 years building production applications with Java / Spring Boot and React / TypeScript.
  • 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

  • Angular
  • Event-driven systems

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.

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)