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

Atos; Polska; Hybrid; PLN 166,000 - 240,000; Full time

Benefits offered by this job

Fully remote work from Poland

Job summary

Atos is seeking a Senior Software Engineer (Full Stack) to join the SIMPL Programme, focused on secure, modular data spaces and cloud-to-edge solutions. You will work in an international team on frontend and backend development, building scalable applications and integrations.

Remote work from Poland, 6-month B2B contract, English required, Senior level with 5+ years of experience. You'll collaborate with architects, product owners and DevOps, and contribute to engineering best practices while

Qualifications

• 5+ years of professional software development experience.
• Hands-on full-stack development with Java and React.
• Experience with REST API design and Kafka.
• Strong English proficiency and agile team experience.

Responsibilities

• Design, develop, test and maintain backend services with Java.
• Design, develop and maintain REST APIs and integrations.
• Build event-driven integrations using Apache Kafka.
• Work with relational databases and data access.
• Ensure code quality with tests, reviews and secure coding.

Skills

Java 21

Spring Framework

Spring Boot

React

TypeScript

REST API

Apache Kafka

Relational databases

JUnit

Git

Agile/Scrum

English

Security practices

Tools

Maven

Tomcat

Argo

Rancher

Elasticsearch

Fortify

SonarQube

Jira

Confluence

CI/CD

Job description

Select how often (in days) to receive an alert:

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

Publication Date: Oct 28, 2026

Ref. No: 548168

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

Location: Remote (from territory of Poland)
Seniority: Senior
Nationality: EU nationality required
Employment Type: 6-months b2b contract
Language: English B2+

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 (from territory of Poland)
• 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.