Find your next tech and IT Job or contract Java Developer (Kotlin, Groovy...)

The Java developer is a web and application development professional specialized in using Java, a server-oriented programming language. They are also called: Java programmer, Java programmer-analyst, Java software development engineer. This IT technician analyzes the specifications provided by the client to identify a technical solution that meets their technical and functional requirements point by point. They are then responsible for custom designing all or part of the computer program in Java. Then comes the trial and testing phase of the applications. Once the program is operational, they can proceed with writing technical documentation and user guides. The Java developer can progress towards supervisory positions, project manager, IT technical manager or even a commercial career.

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Contractor
Permanent

Job VacancyTech Lead Java

NATAN
Published on
Apache Kafka
Domain Driven Design (DDD)
Hibernate

3 years
65k-75k €
500-560 €
Boulogne-Billancourt, Ile-de-France
Contexte de la mission Dans le cadre du renforcement de son équipe technique, nous recherchons un Tech Lead orienté Back-End Java/Spring. Le poste implique un rôle structurant : orienter les choix techniques, intervenir sur des sujets à forte valeur ajoutée et contribuer à l'excellence de l'architecture back-end. Missions principales Définir et orienter les solutions techniques au sein de l'équipe Intervenir sur des sujets à fort enjeu : performance, optimisation, architecture Concevoir et améliorer les architectures back-end (vision globale, pas d'expertise front requise) Réaliser du développement back-end sur des sujets structurants Contribuer aux bonnes pratiques de développement et de code Collaborer avec les équipes front, infra, produit et QA Échanger avec les équipes métier pour comprendre les enjeux fonctionnels Stack & compétences techniques Back-end & Architecture Excellente maîtrise de Java et Spring (Boot, Data, Security…) Forte expérience en architecture logicielle : conception, patterns, bonnes pratiques Connaissance des architectures modernes Microservices, event-driven, hexagonale… Maîtrise des problématiques de performance, scalabilité et optimisation Infrastructure & Environnement Bonnes connaissances Linux Notions d'infrastructure et d'environnements d'exécution Expérience Docker : build, optimisation, déploiement
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Contractor

Contractor jobLead Dev expérimenté Fullstack Java Angular

PROPULSE IT
Published on
Angular
Java

24 months
250-500 €
Paris, France
La mission consiste à piloter une ou plusieurs applications WEB ainsi qu'une petite équipe de développement dans un contexte de legacy (plus de 20 ans) et de nouvelles versions et technologies. Compétences techniques Back : JAVA - JEE - SPRING - SOAP & REST - Confirmé - Impératif FRONT : JQUERY - ANGULAR - CSS - Confirmé - Impératif Lead-DEV : Suivi d'une équipe de développement - Confirmé - Impératif Responsable technique d'application : Projet & TMA - Confirmé - Impératif Connaissances linguistiques Français Courant (Impératif) Anglais Lu, écrit (Secondaire) Description détaillée - Garantir la qualité de code des équipes de développement - Mettre en place les bonnes pratiques en accord avec le responsable et vérifier les actions menées par l'équipe - Valider et garantir le respect des engagements pris par l'équipe (chiffrage, délai) en début de sprint et/ou en fonction des calendriers business - Coordonner les actions techniques avec les autres équipes techniques impliquées sur le projet (infrastructure, intégration, production) - Gérer la planification des ressources - Accompagner les développeurs => Amélioration continue (résolution de problème, anticipation) => Montée en compétences de l'équipe - Se charger du codage de parties spécifiques du programme - Assurer le suivi technique des anomalies et des performances applicatives en production - Reporting, remontée des alertes, des risques et de l'avancée des développements
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Permanent

Job VacancyDéveloppeur Fullstack Java (Luxembourg)

EXMC
Published on
Angular
Java

Luxembourg
· Développement d'une application interne dédiée à la gestion des flux de paiement, comprenant : · Contrôles des paiements · Vérifications de conformité · Gestion des exceptions · Alignement sur les exigences de la version 2026 du SEPA (SR2026) · Migration et conformité aux normes ISO 20022 Expertise : · La fiabilité et l'évolutivité du système · La stabilité de la production et l'excellence opérationnelle · La conformité aux normes réglementaires et aux standards du marché Développement · Concevoir et développer des composants backend en Java / Spring Boot. · Implémenter des API REST et des flux de messagerie (IBM MQ, QMS). · Garantir la conformité aux normes ISO 20022 pour le traitement des messages et aux standards XML. · Rédiger un code propre, maintenable et testable, en appliquant les bonnes pratiques de développement. Tests et assurance qualité · Développer et exécuter des tests unitaires et des tests d'intégration. · Assurer une couverture de code élevée à l'aide de JUnit et JaCoCo. · Contribuer aux tests de non-régression et aux tests de bout en bout (End-to-End). · Identifier, analyser et corriger les anomalies. Qualité du code et revues · Participer aux revues de code. · Veiller au respect des standards de développement et des critères de qualité définis par SonarQube. · Contribuer à l'amélioration continue des pratiques de développement. Documentation · Produire la documentation technique (architecture, conception, API). · Maintenir la documentation des API à l'aide d'OpenAPI / Swagger. · Documenter les flux d'intégration et les interfaces. Support de production (Niveau 3) · Assurer le support de niveau 3 (L3) sur la chaîne de traitement des paiements. · Analyser et résoudre les incidents de production. · Investiguer les problèmes liés aux paiements (rejets, écarts de rapprochement, etc.). · Contribuer à la stabilisation et au renforcement de la fiabilité des environnements de production. · Réaliser des analyses des causes racines (Root Cause Analysis) et mettre en œuvre les actions correctives. Collaboration et livraison · Participer aux cérémonies Agile (Scrum ou méthodologie similaire). · Suivre et communiquer l'avancement des travaux, les risques et les points de blocage.
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Fixed term

Job VacancyJava Application Support

LA International Computer Consultants Ltd
Published on

3 months
SW1A 2AH, City of Westminster, England, United Kingdom
Key Outcomes & Responsibilities * Incident Resolution: Own and resolve P1-P3 incidents within SLA; collaborate across teams for swift recovery. * Problem Management: Perform root cause analysis for recurring issues and implement workarounds or fixes. * Change Delivery: Execute approved changes, participate in CAB processes, and support release deployments. * Environment Management: Ensure availability of non-production environments; resolve environment-related tickets. * Monitoring & Reliability: Enhance monitoring, alerts, and observability to improve service stability. * Service Reporting: Ensure SLAs are met and update stakeholders on ticket progress. * Knowledge Sharing: Create runbooks, work instructions, and upskill junior engineers. * Shift Left: Automate or document repeatable tasks to move work to L1/L2 teams. ________________________________________ Essential Skills (Must Have) * Strong technical troubleshooting across applications and infrastructure. * Experience with logs, monitoring tools, Java, JavaScript and API/microservices debugging. * Good understanding of cloud platforms (AWS). * Familiarity with CI/CD pipelines and deployment workflows. * Working knowledge of scripting (Python/Shell/PowerShell). ACTIVE SC Due to the nature and urgency of this post, candidates holding or who have held high level security clearance in the past are most welcome to apply. Please note successful applicants will be required to be security cleared prior to appointment which can take a minimum 10 weeks. LA International is an award-winning partner of choice for many of the world's most influential companies and government organisations. Holding Enhanced Government Security Accreditation, we are recognised as the European market leader in the delivery of Security Cleared talent to organisations that demand the very highest levels of security, compliance and assurance. An award-winning organisation, having secured the prestigious Queens Award for Enterprise: International Trade over multiple years. We are committed to fostering an inclusive, equitable and accessible workplace where everyone feels valued and supported. We welcome applications from all individuals, regardless of background or identity, and we encourage candidates who may not meet every listed requirement to still apply. If you require any adjustments or support during the recruitment process, please let us know and we will work with you to ensure a fair and accessible experience. Please Note: If a high volume of applications is received, only candidates shortlisted will be contacted.
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Contractor
Permanent

Job VacancyDéveloppeur Java / ReactJS

LEVUP
Published on
Java
React
Spring

12 months
40k-52k €
350-400 €
Villeneuve-d'Ascq, Hauts-de-France
Notre client, acteur majeur de la grande distribution, recherche un Développeur Full Stack Java / React afin de renforcer une équipe en charge d'applications stratégiques liées aux opérations magasins et au e-commerce. Vous rejoindrez une équipe Agile composée de 3 développeurs Full Stack expérimentés (+5 ans d'expérience), intervenant sur un périmètre fonctionnel varié avec de nombreux projets d'évolution et de modernisation. Concevoir, développer et maintenir des applications métier critiques. Participer à l'évolution des plateformes Java et à la modernisation des applications existantes. Développer de nouvelles fonctionnalités Front-end et Back-end. Participer à l'amélioration continue des pipelines CI/CD et de la qualité logicielle. Contribuer à la migration technologique des applications vers des architectures plus modernes. Collaborer étroitement avec les équipes métier afin de faire évoluer les outils existants. Vous interviendrez notamment sur des applications permettant : L'import et l'export du catalogue produits vers différents partenaires et la plateforme Drive. L'import et l'export des données destinées aux étiquettes électroniques en magasin. La gestion des préparations de commandes Drive via un portail de suivi et une application de préparation avec scanner d'articles. La maintenance et l'évolution d'applications historiques en cours de modernisation.
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Permanent

Job VacancyPython Developers

CGI
Published on

London, England, United Kingdom
At CGI, you'll help deliver secure, high-impact solutions that enable government agencies to tackle some of their most complex and mission-critical challenges. As a Python Software Engineer, you'll work with modern technologies to build secure, scalable and reliable systems that drive real-world outcomes. You'll collaborate with talented colleagues, contribute innovative ideas, and take ownership of technical solutions in an environment that values continuous learning, creativity and professional growth. If you're passionate about solving complex engineering problems and want to make a meaningful impact while developing your career, CGI offers the opportunity to do just that. CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named a UK 'Best Employer' by the Financial Times. We offer a competitive salary, excellent pension, private healthcare, plus a share scheme (3.5% + 3.5% matching) which makes you a CGI Partner not just an employee. We are committed to inclusivity, building a genuinely diverse community of tech talent and inspiring everyone to pursue careers in our sector, including our Armed Forces, and are proud to hold a Gold Award in recognition of our support of the Armed Forces Corporate Covenant. Join us and you'll be part of an open, friendly community of experts. We'll train and support you in taking your career wherever you want it to go. Due to the secure nature of the programme, you will need to hold UK Security Clearance or be eligible to go through this clearance. This is role is required on a secure site.
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Frequently asked questions about working as a Java Developer (Kotlin, Groovy...)

What is the role of a Java Developer (Kotlin, Groovy...)

The Java developer is a computer specialist who focuses on designing software and websites. As the name implies, they have Java programming language down pat! Passionate and versatile, the Java developer must possess solid technical skills and some essential qualities to provide their client with a customized IT solution.

How much does a Java Developer (Kotlin, Groovy...) charge

The mastered frameworks, the company's sector, its location and the technical issues to be solved are all criteria that affect the Java developer's salary. Nevertheless, their daily rate is relatively high, even for a beginner. The latter earns an average of 483 euros per day. Their salary will be around £40K.

What is the definition of a Java Developer (Kotlin, Groovy...)

The Java developer creates applications at the client's request using their preferred language: Java. For this purpose, they must comply with the requirements provided in the specifications. They develop the application, then manage the testing phase as well as maintenance and update planning

What type of mission can a Java Developer (Kotlin, Groovy...) handle

The tasks generally assigned to a Java developer are: • Definition of client needs; • Application programming; • Development of website structure; • Writing explanatory notes so that the written code lines are understandable by other stakeholders; • Adding new functionalities and improving the performance of an existing application; • Performing unit tests and integration tests; • Technical support; • Updating existing code.

What are the main skills of a Java Developer (Kotlin, Groovy...)

Knowledge of Java language must be complemented by knowledge of: • The J2EE development platform; • Other programming languages; • Oracle and SQL databases; • Tools and frameworks such as Spring, Spring boot, React, Angular, Hibernate, AWS, GWT, Struts or Docker; • Algorithms; • Security standards and procedures to combat cyberattacks; • The business environment (market, services, customers). Those who wish to work as Java developers must also master English.

What is the ideal profile for a Java Developer (Kotlin, Groovy...)

In addition to the diploma and technical skills, recruiters require future Java developers to be: • Rigorous and precise in writing code; • Creative; • Good listeners; • Able to work in an agile environment; • Flexible and available; • Able to communicate and explain their knowledge to non-technical people; • Curious, as computer programs and languages are constantly evolving. A strong sense of analysis and organization is also required!

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