April 24, 2026

Senior Software Engineer (Java+React)

Senior • Hybrid

21,000 - 22,000 PLN/mo

Warsaw, Poland

💰 Salary: 21,000-22,000 PLN/month
🌎 Hybrid from Warsaw, Poland
🕦 Full-time position, long-term
☑️ Contract of Employment

We are looking for a Software Engineer to join our client, a technology company that builds AI-powered platforms and consulting solutions for enterprise operations, with a strong focus on the private capital sector. The company has over ten years of experience working with high-growth and PE-backed businesses, combining deep domain expertise with advanced technology to drive measurable results.

Requirements:

  • 5+ years of professional experience as a Full Stack Developer working with Java and React.js.

  • Strong proficiency in React.js, Redux, TypeScript, HTML5, CSS3, and modern JavaScript (ES6+).

  • In-depth understanding of state management solutions and component-based design principles.

  • Experience working with UI libraries/frameworks such as Material-UI, Bootstrap, or Tailwind CSS.

  • Solid expertise in Java, Spring Boot, Hibernate, JPA, and building RESTful APIs.

  • Experience designing and working with microservices architecture and API Gateway patterns.

  • Knowledge of authentication and authorization approaches, including OAuth2, JWT, and session-based methods.

  • Experience with relational databases (PostgreSQL, MySQL) as well as NoSQL solutions (MongoDB, Redis).

  • Hands-on experience using CI/CD tools like Jenkins, GitHub Actions, or GitLab CI/CD.

  • Familiarity with cloud platforms such as AWS, Azure, or GCP, along with containerization tools like Docker and Kubernetes.

  • Bachelor’s or Master’s degree in Computer Science, Engineering, or a related discipline.

  • Experience operating within Agile development environments.

  • Strong analytical thinking and problem-solving abilities.

Key Responsibilities:

  • Build and develop dynamic, responsive, and high-performing user interface components using React.js, Redux, and modern JavaScript (ES6+).

  • Ensure applications function consistently across different browsers while delivering a smooth user experience.

  • Enhance front-end performance and apply best practices in UI/UX design.

  • Design, develop, and maintain RESTful APIs and microservices using Java technologies such as Spring Boot, Hibernate, and JPA.

  • Implement secure authentication, authorization, and effective data management solutions.

  • Work with both relational and NoSQL databases, including PostgreSQL, MySQL, and MongoDB.

  • Integrate external services, APIs, and cloud-based platforms into applications.

  • Oversee deployment processes using CI/CD pipelines and containerization technologies like Docker and Kubernetes.

  • Produce clean, efficient, and maintainable code in line with established best practices.

  • Develop and maintain unit and integration tests for both front-end and back-end systems.

  • Collaborate closely with UI/UX designers, product managers, and DevOps specialists.

  • Take part in Agile/Scrum processes and support ongoing improvements to development workflows. 

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