Fullstack Developer (Java/React)

Integral Solutions - Data & AI

Poland · Full-time · Not Applicable

Job title: Fullstack Java Developer

Location: Poland and Remote

Work mode: Remote

Type of cooperation: B2B Contract

Salary range: 40-50 Euro/h B2B Net+ Vat

About The Company/project

We are looking for an exceptional Senior Software Developer with a passion for coding who is not afraid to seek new solutions. We offer cooperation with a unique client who provides opportunities for development in many complex and global supply chain projects. You will join a new IT Hub, where you will encounter only new technologies and projects related to the creation of new functionalities.

Responsibilities

Full-stack development of innovative applications with Java, Spring, React, and modern JS frameworks.
Develop and integrate AI-powered features using Python, leveraging LLMs
Design and implement prompt engineering strategies to optimize model outputs and business use cases.
Build and maintain LLM-based services (e.g. chatbots, recommendation engines, document processing pipelines).
End-to-end ownership of the development lifecycle: design, architecture, coding, testing, deployment, and DevOps.
Build and maintain microservices architectures and reactive UIs.
Apply TDD/BDD practices with JUnit, Mockito, Jasmine, Selenium/Protractor.
Contribute to CI/CD pipelines and deployments on Kubernetes / Cloud Foundry.
Design and deliver cloud/hybrid solutions with high scalability and reliability.
Work in XP practices, including remote pair programming and continuous delivery.

You Are An Ideal Candidate If You Have

BSc in Software Engineering or BS degree in Computer Science.
8+ years of experience in the following technologies: Java (must have), Spring.
2+ years of experience with Python -MUST
2+ years of experience in FE, mainly React (MUST), and other modern JavaScript Framework/libraries.
Experience with LLMs/AI/Prompt Engineering/MCP.
Experience with Functional Programming and Java Streams.
Experience with developing a reactive UI (Reactive JS).
2+ years of experience in TDD/BDD development in the following frameworks: Junit, Jasmin, Mockito, Protractor/Selenium
3+ years of experience in micro-services-based architecture and tools (Spring Boot/Cloud)
Experience in designing, developing, and deploying cloud/hybrid-based solutions.
Experience in developing and deploying in Container based environments (Kubernetes, Cloud foundry).
Familiarity with the following design concepts: micro-services, service discovery, circuit breaker.
Good English - verbal and written.

Nice To Have

Experience with Data Analytics – big advantage.
Experience in development in Kotlin – big advantage.
Experience in DevOps development and Jenkins.

Key Skills

Ranked by relevance

java kubernetes python react cloud junit functional programming microservices javascript kotlin devops cicd ai ui

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