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Offer summary
(Summary generated by AI based on the full job description)
Project focuses on digital business and system integrations. Technologies include Java 21+, Spring Boot, REST/JSON/OpenAPI, OAuth2/JWT, SOAP/XML and async brokers like Kafka or RabbitMQ. Environment uses Kubernetes, CI/CD (Bamboo/Jenkins), Git/Bitbucket and API Management. Responsibilities cover designing and implementing integrations and APIs, testing and maintaining flows, ensuring quality, security and performance, participating in technical decisions, code reviews and deployment automation. Requires min. 4 years of experience and fluent Polish.
from: 5 October 2026
to: 4 November 2026
salary not specifiedB2B contract (full-time)
Offer parameters
level:senior
working mode:hybrid • full office
Warszawa, Mokotów
Requirements
Expected technologies
Java 21+
Spring Boot
REST
JSON
Apache Kafka
RabbitMQ
CI/CD
API
Optional technologies
Azure API Management (APIM)
Docker
Kubernetes
Helm
Apache NiFi
Our requirements
- Minimum 4 years of commercial experience in developing applications in Java, including practical work with Java 21+ and Spring Boot
- Hands-on experience designing and implementing system integrations and APIs using REST, JSON, OpenAPI, OAuth 2.0, JWT, SOAP, and XML
- Practical knowledge of asynchronous integrations using Apache Kafka, RabbitMQ, or another message broker
- Proficiency in implementing integrations using API Management platforms, including API publishing and security
- Background in developing solutions based on microservices architecture and deploying them in a Kubernetes environment
- Strong understanding of CI/CD processes, particularly Bamboo or Jenkins, as well as Git/Bitbucket repositories; practical experience with deployment automation and Jira
- Knowledge of unit testing and Java testing frameworks
- Solid experience with PostgreSQL or Oracle databases, including creating and optimizing SQL queries
- Ability to work independently, solve problems, and make technical decisions within projects
- Fluent Polish
Optional
- Experience working with Microsoft Azure API Management or an equivalent solution
- Practical experience with Docker, Kubernetes, and Helm
- Knowledge of Apache NiFi in integration solutions
Your responsibilities
- Designing, implementing, testing, and maintaining integration flows and APIs according to requirements and Definition of Done
- Actively participating in technical decision-making regarding integration and API implementation, considering architectural standards
- Ensuring the quality, security, availability, and performance of delivered solutions, including diagnosing issues and addressing their root causes
- Collaborating with architects, analysts, Product Owners, and project teams to refine requirements and agree on solutions
- Participating in estimation, work planning, and analysis of technical risks
- Supporting team members in solving technical problems and sharing best practices
- Regularly participating in code reviews and developing coding quality standards and software production automation
About the project
We are looking for a skilled Java Integration Developer to join a transformative project in the digital business domain. You will be responsible for creating and developing integration services and APIs, designing and implementing integrations between systems, and collaborating with architects, analysts, and project teams. Your work will involve utilizing CI/CD automation and Kubernetes environments to ensure the quality, security, and performance of services. This role offers opportunities for further development in API management, asynchronous integrations, and orchestration. If you are passionate about systems integration and want to make an impact, this opportunity may be the right fit for you.
This is how we work
Java Integration Developer (f/m/x)
I apply to:
Sii Sp. z o.o.
Warszawa, Mokotów
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