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.

1,074 results
Contractor

Contractor jobJava Developer

LA International Computer Consultants Ltd
Published on

£340-345
Belyy, Tver Oblast, Russia
Java developer - Glasgow Strong experience in Java development, including Java 21-25, modern Java features, and object-oriented design principles. Experience developing and maintaining applications using Spring Boot 4.x, REST APIs, and microservices architectures. Good technical and analytical skills, with the ability to understand existing systems, troubleshoot issues, and deliver effective solutions. Highly Valued Skills Experience developing enterprise applications using GitLab, GitLab CI/CD, Maven/Gradle, automated testing, and source control best practices. Experience with Kubernetes, Docker, and containerized application deployment. Experience with messaging technologies such as JMS, Kafka, or similar platforms. Knowledge of modern web technologies including React, TypeScript, HTML5, CSS, and JavaScript. Experience within the Financial Services sector. Familiarity with AI-assisted development tools such as GitLab Duo, Claude, and similar developer productivity platforms. 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. A multiple award-winning organisation, having secured the prestigious Queens Award for Enterprise: International Trade over consecutive 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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Permanent

Job VacancyDéveloppeur Java H/F

Webnet
Published on
Java
Kotlin
Quarkus

39k-45k €
Lille, Hauts-de-France
Rejoignez un projet à fort impact technique ! Vous souhaitez évoluer au sein d'une équipe agile et contribuer au développement d'applications à fort trafic ? Vous aimez travailler sur des architectures modernes et développer des applications robustes, de la conception à la mise en production ? Cette mission en régie chez un client de notre agence Lilloise est faite pour vous ! Dans le cadre du renforcement d'une équipe de développement composée de 6 personnes, nous recherchons un Développeur Full Stack Java / ReactJS pour intervenir sur des projets stratégiques autour d'API et d'applications web. Vos missions Au sein d'une équipe Agile, vous serez amené(e) à : Concevoir, développer et faire évoluer des applications web et des API. Développer les fonctionnalités back-end en Java et les interfaces utilisateur en ReactJS. Réaliser les tests unitaires, d'intégration et end-to-end afin de garantir la qualité des développements. Participer aux revues de code et promouvoir les bonnes pratiques de développement. Rédiger les documents de conception technique. Analyser et corriger les anomalies en production en identifiant rapidement leur origine. Contribuer à la qualité, à la sécurité et à la performance des applications. Participer activement aux cérémonies Agile Collaborer avec les différentes parties prenantes techniques pour concevoir les meilleures solutions. Votre environnement technique Vous évoluerez dans un environnement moderne comprenant notamment : Java ReactJS APIs REST & OpenAPI AWS (Lambda, DynamoDB, Aurora PostgreSQL, API Gateway, SQS) Kubernetes Git, GitLab Jenkins Terraform Robot Framework Gatling Architecture hexagonale Domain Driven Design (DDD) CI/CD Notre pôle Java c'est : Intégrer une équipe passionnée et impliquée dans la veille techno Être accompagné(e) dans votre carrière par notre Responsable Technique Adhérer à notre plan d'Excellence via nos process de certifications Participer activement aux réunions techniques de pôle, accéder à nos formations internes (ou en dispenser), partager les best practices Participer à nos JavaContest pointus Pourquoi nous rejoindre ? Certifié Great Place To Work depuis 2018 Possibilité d'être formé et certifié par Webnet Ambiance conviviale avec des évènements internes récurrents (activités sportives, loisirs etc…) ainsi que la garantie d'un équilibre entre votre vie privée et professionnelle Participation à des challenges hebdomadaires : Team #dragondefeu vs #dragondeglace Membre de la charte éthique & diversité (+ 15 nationalités représentées) & Dragon Funding (programme de soutien associatif) Nos petits + : 2 types de primes : de régie et participation Carte ticket restaurant : SWILE (9€ par jour) 🥣 Prise en charge à 80% des abonnements en transport en commun Des convaincus du télétravail Avantage ancienneté : à partir de 2 ans, Webnet vous rembourse un abonnement quel qu'il soit via des coins qui se cumulent
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Job VacancyBusiness Developer / Manager Expérimenté – ESN - Conseil en Ingénierie à Lyon

Deodis
Published on
Business Development

50k-60k €
Lyon, Auvergne-Rhône-Alpes
Business Developer / Manager Expérimenté – ESN - Conseil en Ingénierie à Lyon ………………………… PRESENTATION ENTREPRISE Itamsys est une structure en pleine croissance spécialisée dans le conseil en ingénierie IT et l'intégration de solutions logicielles de Service Management. Nous accompagnons nos clients dans leurs projets à forte valeur ajoutée, en leur proposant les meilleurs experts sur des missions longues et pluriannuelles. Itamsys, c'est avant tout une structure à taille humaine, fondée sur des compétences et des personnalités. Nous sommes convaincus que l'épanouissement passe par l'engagement, la solidarité, la convivialité et les moyens. C'est dans cet esprit que nous accueillons les nouveaux collaborateurs. . DESCRIPTIF DU POSTE Dans le cadre de notre développement, nous recherchons un(e) Ingénieur Commercial expérimenté / Business Developer pour rejoindre notre Business Unit IT Services et contribuer activement à la croissance de nos activités de conseil en ingénierie. Vos principales responsabilités seront les suivantes : · Prospecter et développer un portefeuille de clients (PME, ETI, Grands Comptes). · Qualifier les besoins clients en expertise et conseil en ingénierie IT. · Collaborer étroitement avec les équipes de recrutement pour identifier et proposer les meilleurs consultants. · Piloter le cycle de vente complet : identification, qualification, proposition, négociation et closing. · Assurer le suivi et la fidélisation de vos clients afin de garantir leur satisfaction et identifier de nouvelles opportunités. · Contribuer activement à la stratégie commerciale et au développement du chiffre d'affaires de la BU IT Services. PROFIL De formation supérieure Bac+5 (école de commerce ou école d'ingénieur), vous justifiez d'une expérience d'au moins 3 ans dans une fonction commerciale B2B, idéalement au sein d'une ESN ou d'une société de conseil. Une bonne compréhension des environnements techniques et des métiers de l'ingénierie IT est nécessaire. Chasseur(se) et entrepreneur(se) dans l'âme, orientés résultats, vous êtes animé(e) par l'envie de générer de la croissance et d'accélérer le développement d'une entreprise en pleine expansion. Vous avez d'excellentes qualités relationnelles et le sens du service client. Enfin, vous avez envie d'évoluer dans une structure à taille réellement humaine où votre engagement et vos réussites seront reconnues. POURQUOI NOUS REJOINDRE ? Nous sommes une ESN agile qui valorise l'autonomie, la collaboration et l'initiative. Notre BU IT Services est en plein essor et au cœur de la stratégie de développement du groupe. Vous aurez la possibilité de collaborer avec des clients variés, sur des projets à forts enjeux technologiques. Nous vous proposons un environnement stimulant et une culture d'entreprise humaine et exigeante, centrée sur la confiance, la transparence et la réussite collective. Si vous vous reconnaissez, venez nous rencontrer ! CONDITIONS DU POSTE Home office 3 journées sur 5. 50 k€ à 60 k€ + Intéressement
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Job VacancySenior Java Developer

CGI
Published on

United Kingdom
At CGI, our Senior Java Developers play a vital role in building the secure, scalable digital solutions that help organisations innovate, transform and succeed. As we expand our software engineering capability across the UK, you'll take ownership of developing high-quality applications that solve complex client challenges and deliver lasting business value. Working alongside talented engineers, architects and consultants, you'll explore modern technologies, influence technical decisions and champion creative approaches to software development. With the support of our collaborative engineering community, you'll have opportunities to strengthen your expertise, mentor others and shape the future of digital services while making a meaningful impact across diverse industries. 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 a hybrid position.
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Job VacancyFull Stack Engineer (Java/React) - FX Trading

█ █ █ ██ █ █
Published on
Java
Kotlin
React

London, England, United Kingdom

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Job VacancyRéférent Technique Android Kotlin H/F

█ █ █ ██ █ █
Published on
Android
API
Java

50k-60k €
Nantes, Pays de la Loire

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Job VacancySenior Java Developers

CGI
Published on

United Kingdom
At CGI, we're shaping the future of digital UK Government solutions, building secure, high-impact platforms that improve services for millions across the UK. Continued success working with our Government clients has created strong demand for Java Developers. As a Senior Java Developer , you'll play a pivotal role in designing and developing scalable, resilient back-end systems using the latest Java and microservices technologies. You'll collaborate with skilled professionals who take ownership of their work, share ideas freely, and are empowered to create solutions that make a lasting difference. This is an opportunity to contribute to a variety of major national UK Government programmes where innovation, teamwork, and continuous learning come together to deliver meaningful results for our clients and UK helping improve UK citizens' lives. 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 our work programmes, you will need to hold UK Security Clearance or be eligible to go through this clearance. These roles will be predominately hybrid with some work based in UK CGI or client offices depending on the specific programme. Travel away from base office will be expensed.
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Fixed term

Job VacancyJava Microservice developer

LA International Computer Consultants Ltd
Published on

7 months
Belyy, Tver Oblast, Russia
Job title: Principal Engineer - Java Microservices Developer Location: Edinburgh (Hybrid) Contract: 6 Months Day Rate: £450 per day The Role We are looking for an experienced Principal Engineer to design, develop, and support secure, scalable, and high-performing software solutions. You will provide technical leadership, contribute to solution design, and work closely with Product Owners, Architects, and Engineering teams within an Agile environment. Key Responsibilities * Develop and maintain Java-based applications and microservices. * Contribute to solution design and technical delivery. * Write clean, maintainable, and well-tested code. * Support CI/CD pipelines and automated testing. * Participate in code reviews and technical discussions. * Resolve production issues and ensure system reliability. * Mentor engineers and promote best practices. Essential Skills * Java Spring Boot Microservices * React Single Page Applications (SPA) * PostgreSQL * API Gateway technologies: TYK, Apigee, DataPower * Cloud platforms: AWS, PCF, TAS * Integration & batch tools: StreamSets, Airflow, ESP Services, GSS * CI/CD, Agile delivery, and DevOps practices Ideal Candidate A senior engineer with strong Java and cloud-native development expertise, capable of leading technical delivery and driving engineering excellence in a complex enterprise environment. 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. A multiple award-winning organisation, having secured the prestigious Queens Award for Enterprise: International Trade over consecutive 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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Permanent

Job VacancyDéveloppeur Android Kotlin

VADEMI
Published on
Coroutines
Kotlin

6 months
44k-50k €
400-480 €
Châtillon, Ile-de-France
Notre client, renforce l'équipe en charge de son application mobile Android de préparation de commandes. Cet outil métier est au cœur de l'activité e-commerce. Sa fiabilité, sa rapidité et son ergonomie ont un impact direct sur la productivité des équipes et sur la qualité de service rendue aux clients. Vous interviendrez sur l'ensemble du cycle de vie de l'application. Build Concevoir et développer de nouvelles fonctionnalités en Kotlin (coroutines, Jetpack Compose), en lien avec les Product Owners et les équipes métier. Participer à la modernisation progressive de l'application : migration vers Jetpack Compose, mise en place d'une Clean Architecture, amélioration de la CI/CD. Run Assurer la maintenance corrective et évolutive de l'application. Analyser et résoudre les incidents de production. Participer au dispositif d'astreinte pour garantir la continuité des préparations en magasin. Qualité Produire un code fiable, maintenable et testé : revues de code, tests unitaires et d'intégration, automatisation. Tenir compte des contraintes du terrain : performance sur terminaux mobiles, connectivité variable en magasin, gestion des données locales. Les livrables attendus sont la conception, le développement et les tests unitaires. C'est une mission concrète et à fort impact. Elle conviendra à un développeur Android souhaitant allier modernisation technique et application métier utilisée à grande échelle.
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Fixed term

Job VacancyJunior Java Developer

LA International Computer Consultants Ltd
Published on

6 months
£300-360
SW1A 2AH, City of Westminster, England, United Kingdom
Junior Java Developer (1-4 years experience) We are looking for a number of Junior Java Developers for a Public Sector client. You will have between 1 to 4 years experience with a keenness to further develop your skills and experience in Java software development. * Programming Languages: Proficiency in Java (often Java 11 or newer) and Object-Oriented Programming (OOP). * Frameworks: Familiarity with the Spring ecosystem, particularly Spring Boot and RESTful web services. * Tools & Version Control: Experience with Git, build tools like Maven or Gradle, and containerization basics like Docker. This is a 6 month contract initially and is on a hybrid working model with two days in the office in London every week. It is an inside IR35 contract starting in early December. Candidates with SC clearance or willing to undergo will be considered. To be considered for the position please send over an updated CV. 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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Permanent

Job VacancyLead Dev Back-End Java Python (H/F) | Niort

K-Lagan
Published on
Back-end
Development
Java

1 month
50k-55k €
520-580 €
Niort, Nouvelle-Aquitaine
Et si votre prochain projet vous permettait de concevoir des architectures backend robustes et de relever de vrais défis techniques ? 🚀 Chez K-LAGAN, nous recherchons un(e) Lead Dev Back-End Java Python (H/F) pour accompagner l'un de nos clients grands comptes dans la conception et l'évolution de systèmes distribués à forts volumes de données. 🎯 Votre missionVous interviendrez sur des projets stratégiques nécessitant une forte expertise en Java, Python et Apache Kafka, avec des enjeux de performance, de scalabilité et de résilience. Votre rôle combinera architecture technique, développement backend et accompagnement des équipes de développement. 🔧 Vos principales responsabilitésConcevoir et faire évoluer des architectures backend distribuées. Participer activement au développement de services en Java et Python. Concevoir et optimiser des architectures événementielles avec Apache Kafka. Optimiser les traitements, les flux et la gestion de volumes importants de données. Anticiper les problématiques de montée en charge, de performance et de concurrence. Garantir la résilience des applications : gestion des erreurs, reprises sur incident et prévention des pertes de données. Définir les standards de développement, de qualité et de sécurité. Accompagner techniquement les développeurs et favoriser le partage des bonnes pratiques. Collaborer avec les équipes Data, DevOps et Produit.
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Job VacancyDéveloppeur.se Java / Talend - NIORT 79

K-Lagan
Published on
DBT
Development
Java

1 year
43k-49k €
420-490 €
Niort, Nouvelle-Aquitaine
Et si votre prochain projet faisait grandir vos compétences autant que votre carrière ? 🚀 Chez K-LAGAN, nous faisons vivre chaque projet grâce aux talents qui le portent, en alliant expertise technique et accompagnement personnalisé. Aujourd'hui, nous recherchons un.e Java / Talend pour rejoindre l'un de nos clients du secteur de l'assurance, basé à Niort. Le contexte : Vous interviendrez sur des applications et des traitements de données au sein d'un environnement technique orienté Java, SQL et ETL. Vous contribuerez au développement et à l'optimisation des flux de données, à la maintenance des applications et à l'amélioration continue des solutions existantes, dans un environnement agile. Vos missions : Développer et maintenir des applications et des API REST en Java. Concevoir, développer et optimiser des flux ETL avec Talend. Exploiter et transformer les données en garantissant la fiabilité et la performance des traitements. Concevoir et optimiser des requêtes SQL complexes, notamment sur Oracle. Participer à la gestion des versions des bases de données et à l'évolution des traitements. Réaliser les tests unitaires et d'intégration, puis documenter les résultats. Estimer la charge technique des User Stories et préparer les livrables jusqu'à leur déploiement en production. Identifier des axes d'amélioration sur la qualité du code, les performances et les processus de déploiement. Votre environnement technique : Développement : Java 17/21, Java/JEE, API REST. ETL & transformation de données : Talend Open Studio (TOS), Talend Integration Suite (TIS), dbt. Bases de données : Oracle SQL, PL/SQL, PostgreSQL, MySQL, SQL Server. Gestion des bases de données : Liquibase, optimisation SQL, indexation et partitionnement. Outils & CI/CD : GitLab, Maven, Jenkins, Artifactory, SonarQube, Eclipse. Déploiement : Docker, Kubernetes. Environnement complémentaire : Angular, Jira, méthodes agiles.
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Job VacancyJava Developer - Springboot & Microservices

█ █ █ ██ █ █
Published on
Docker
Gradle
Java

Glasgow, Scotland, United Kingdom

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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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