Senior Software Engineer (Java+React)

💰 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.