Full Stack Developer with React, Java and Kafka - 6-months contract

Atos; Bydgoszcz; Remote; PLN 165,000 - 248,000; Full time

Benefits offered by this job

Fully remote work model

All tools provided

Job summary

Atos is seeking a Senior Software Engineer (Full Stack Developer) to join the SIMPL Programme for a 6-month B2B contract. You will work on secure, modular data platform integrations with Java, Spring, Spring Boot, React and Kafka in an international team.

The role is fully remote with access to all required tools and equipment. Requirements include 5+ years of hands-on experience, strong REST API design, Kafka, React/TypeScript, and English proficiency.

Responsibilities

• Design, develop, test and maintain backend services using Java 21, Spring Framework and Spring Boot.
• Design, develop and maintain REST APIs and platform integrations.
• Build and support event-driven integrations using Apache Kafka.
• Develop and optimize application interactions with relational databases.
• Ensure high code quality through automated testing, peer reviews, JUnit and secure coding practices.

Job description

Full Stack Developer with React, Java and Kafka - 6-months contract

Publication Date: Oct 28, 2026

Ref. No: 548168

Location: Bydgoszcz, PL Łódź, PL Gdansk, PL Opole, PL Warszawa, PL Krakow, PL Bydgoszcz, PL Wroclaw, PL

Atos is the Atos Group brand dedicated to AI-powered, secure, end-to-end digital services. Atos designs, develops, and operates critical digital environments that drive performance, resilience and sovereignty, helping public and private organizations worldwide retain control over their data and infrastructures, while meeting regulatory requirements.

With more than 52,000 employees serving over 4,500 clients across 54 countries, Atos helps modernize core IT systems, accelerate cloud and data transformation, strengthen cybersecurity, and deliver secure digital workplace environments to support its clients, its employees and society. Atos also provides consulting and advisory services through its Atos Amplify brand.
A trusted partner in operating complex and mission-critical environments, Atos supports organizations across highly regulated and sovereign contexts.

Atos Group is a global leader in digital transformation with c. 54,000 employees and annual revenue of c. €7.2 billion, operating in 54 countries under two brands - Atos for services and Eviden for products and systems. European number one in cybersecurity and a leader in cloud, Atos Group is committed to a secure and decarbonized future and provides tailored AI-powered, end-to-end solutions for all industries. Atos Group is listed on Euronext Paris.

Senior Software Engineer (Full Stack Developer)

We are looking for an experienced Senior Software Engineer (Full Stack Developer) to join an international team working on the SIMPL Programme, an initiative focused on developing a secure, modular and interoperable platform supporting European data spaces and cloud-to-edge solutions.

You will work hands-on across frontend and backend development, building scalable applications, APIs and integrations in close cooperation with Architects, Product Owners, Business Analysts, Test Engineers and DevOps specialists.

Responsibilities:

• Design, develop, test and maintain backend services using Java 21, Spring Framework and Spring Boot.
• Design, develop and maintain REST APIs and platform integrations.
• Build and support event-driven integrations using Apache Kafka.
• Develop and optimize application interactions with relational databases.
• Ensure high code quality through automated testing, peer reviews, JUnit, SonarQube and secure coding practices.
• Identify and address security findings and vulnerabilities, including those identified through Fortify and other security scans.
• Build and package applications using Maven and support deployment and operational activities in Tomcat-based environments, Argo and Rancher.
• Investigate and troubleshoot technical issues using logs, monitoring tools and Elasticsearch.
• Maintain code, configuration and technical documentation using Git, Jira and Confluence.
• Contribute to engineering best practices and continuous improvement across the programme.

Requirements:

• 5+ years of professional software development experience, including hands-on full-stack development.
• Strong practical experience with Java, ideally Java 21, Spring Framework and Spring Boot.
• Strong hands-on experience with React and TypeScript.
• Solid experience in REST API design and integration.
• Practical experience with Apache Kafka and event-driven integrations.
• Good knowledge of relational databases and database interactions.
• Experience with automated testing, JUnit, Git and code-review practices.
• Experience working within Agile/Scrum delivery teams.
• Understanding of secure coding and software quality practices.
• Ability to work independently and collaborate effectively within an international, cross-functional team.
• Very good command of English.

Nice to have:

• Experience with microservices and distributed systems.
• Experience with cloud-native application development and containerized environments.
• Knowledge of CI/CD and DevSecOps practices.
• Experience with SonarQube, Fortify, Argo, Rancher and Elasticsearch.
• Experience with performance and scalability optimization.
• Experience working on large-scale platform or integration programmes.

What We Offer:

• Cooperation under a 6-month B2B contract.
• A fully remote working model.
• All tools and equipment required to perform your work.
• Opportunities to develop your skills while contributing to an engaging project.

Here at Atos, diversity and inclusion are embedded in our DNA. Read more about our commitment to a fair work environment for all.

Atos is a recognized leader in its industry across Environment, Social and Governance (ESG) criteria. Find out more on our CSR commitment.