April 8, 2026

Software Engineer (React)

Senior • Hybrid

4,100 - 4,800 USD

Warsaw, Poland

Overview


We are a company that leads in AI-powered business operations, providing digital solutions and consulting services that help businesses grow and improve. We focus on using advanced technology to make operations easier, increase efficiency, and create new opportunities, especially in private capital markets.

Our services include:

  • PaaS (Platform as a Service): Our main platform uses AI to improve workflows, generate insights, and help businesses grow faster.

  • SaaS (Software as a Service): A cloud platform that offers strong performance, smart tools, and large-scale execution.

  • S&C (Solutions and Consulting Suite): Flexible technology tools to manage, develop, and improve business performance.

With over ten years of experience helping fast-growing companies and private equity-backed businesses, we bring deep knowledge and a proven track record of turning technology into a real advantage.

Responsibilities

  • Design and develop user interfaces using React.

  • Implement and maintain test-driven development (TDD) and continuous integration.

  • Work with project managers, analysts, and sales teams to deliver high-quality products on time.

  • Follow best practices in testing, accessibility, and performance.

  • Work closely with design, backend, QA, and product teams to build user-friendly solutions.

Requirements

  • 6+ years experience with JavaScript and TypeScript.

  • Understand design patterns and how to use them in JavaScript.

  • Experience with modern front-end frameworks like React.js + Redux; Next.js is a bonus.

  • Knowledge of functional and asynchronous programming.

  • Experience with Git and branch management.

  • Ability to debug front-end issues and use debugging tools.

  • Familiar with creating and integrating custom packages.

  • Understand object-oriented programming concepts in JavaScript.

  • Can work under pressure and meet tight deadlines.

  • Hands-on experience with HTML5 and CSS3.

  • Familiar with Agile development practices.

  • Good communication and organizational skills.

  • Able to write code that works across different browsers.

  • Bachelor’s degree in Computer Science or similar is preferred.

Why Join Us?


We appreciate creative problem-solvers who learn quickly, work well in a diverse environment, and like to raise the standard for success. We work hard but also make sure to enjoy what we do.

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Warsaw, Poland

6,500 - 7,000 USD

🏢 Summary: Full Stack Developer role with a primary focus on backend development in Java, responsible for building and maintaining scalable, secure microservices and REST APIs within an Agile environment. The position involves database design, cloud integration, and CI/CD pipeline participation, with additional work on modern React-based frontend components. The role emphasizes high code quality, performance optimization, and secure application architecture. 🗂️ Requirements: 5+ years experience in Full Stack or Backend development, Strong proficiency in Java, Experience with Spring Boot, Hibernate, JPA, Experience building REST APIs and microservices, Knowledge of OAuth2 and JWT authentication, Experience with SQL and NoSQL databases, Experience with CI/CD pipelines, Experience with Docker and Kubernetes, Cloud platform experience (AWS, Azure, or GCP), Experience working in Agile teams, Bachelor’s or Master’s degree in Computer Science or related field 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, REST, Microservices, OAuth2, JWT, PostgreSQL, MySQL, MongoDB, Redis, React, Redux, TypeScript, JavaScript, HTML5, CSS3, MaterialUI, Bootstrap, Tailwind, Jenkins, GitHubActions, GitLab, Docker, Kubernetes, AWS, Azure, GCP 🏢 Description: Overview We are a company leveraging AI to optimize business operations. Our mission is to provide digital solutions and consulting services that help companies grow and create value. By using modern technology, we simplify processes, increase efficiency, and discover new revenue opportunities—especially in private capital markets. Our ecosystem includes: PaaS (Platform as a Service): A core platform that enhances workflows, provides actionable insights, and supports value creation. SaaS (Software as a Service): A cloud platform offering robust performance and intelligent tools at scale. S&C (Solutions & Consulting): Flexible tools and methodologies to manage, grow, and improve company performance. With over 10 years of experience working with fast-growing companies and private equity businesses, we know how to harness technology to deliver tangible business advantages. Job Description We are looking for Full Stack Developer with strong Java expertise. While your main focus will be backend systems, experience with modern frontend technologies (React.js, TypeScript) is also required. You will join an Agile team to design, build, and maintain scalable, secure, and high-performing applications. Key Responsibilities Backend Development (Primary Focus) Develop and maintain REST APIs and microservices using Java (Spring Boot, Hibernate, JPA). Implement secure authentication, authorization, and data handling mechanisms. Design and optimize databases (PostgreSQL, MySQL, MongoDB) for performance and reliability. Integrate with third-party APIs, cloud services, and internal systems. Participate in deployment pipelines using CI/CD tools (Jenkins, GitHub Actions, GitLab CI/CD) and containerization (Docker, Kubernetes). Frontend Development (Nice-to-Have) Build responsive UI components using React.js, Redux, and modern JavaScript/TypeScript. Apply best practices in UI/UX design, performance optimization, and cross-browser compatibility. Work with UI frameworks like Material-UI, Bootstrap, or Tailwind CSS. Code Quality & Testing Write clean, maintainable, and well-documented code. Create unit and integration tests for backend services, and frontend components if applicable. Collaboration & Agile Development Collaborate with designers, product managers, and DevOps engineers. Participate in Agile/Scrum ceremonies and contribute to process improvement initiatives. Required Skills & Experience Backend Strong proficiency in Java , Spring Boot, Hibernate, JPA, and REST API development. Experience with microservices architecture and API Gateway. Knowledge of authentication/authorization protocols: OAuth2, JWT, sessions. Frontend (Optional / Nice-to-Have) Experience with React.js, Redux, TypeScript, HTML5, CSS3, and modern JavaScript. Understanding of state management and component-based design. Familiarity with UI libraries/frameworks: Material-UI, Bootstrap, or Tailwind CSS. Database & DevOps SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis). CI/CD pipelines (Jenkins, GitHub Actions, GitLab CI/CD). Cloud platform experience (AWS, Azure, GCP) and containerization (Docker/Kubernetes). Qualifications Bachelor’s or Master’s degree in Computer Science, Engineering, or related field. 5+ years of experience as a Full Stack or Backend Developer. Experience working in Agile teams. Strong problem-solving and analytical skills. Soft Skills Excellent communication and teamwork abilities. Ability to manage multiple tasks in a fast-paced environment. Eagerness to learn new technologies and improve processes.

Technology

Link Group

Full-Stack Developer

Mid

Hybrid

Warsaw, MZ, Poland

🏢 Summary: Full-stack engineering role focused on building scalable web applications using Python (FastAPI) and React.js. The position involves designing databases, developing RESTful APIs, and deploying cloud-native solutions on AWS with containerization and CI/CD practices. The role also includes developing Generative AI applications using modern AI tools and APIs. 🗂️ Requirements: Proven experience with Python and FastAPI, Ability to work with React.js on frontend development, Hands-on experience with PostgreSQL, Redis, and PGVector, Experience managing infrastructure on AWS, Proficiency with Docker and Kubernetes, Experience implementing CI/CD pipelines and automated testing, Strong understanding of RESTful API design and backend services, Experience or strong interest in Generative AI development using LangChain or OpenAI APIs 📃 Skills: Python, FastAPI, React, PostgreSQL, Redis, PGVector, AWS, Docker, Kubernetes, SQL, NoSQL, REST, CICD, LangChain, OpenAI 🏢 Description: Key Responsibilities: Backend & Frontend Development: Develop scalable web applications using Python (FastAPI) and work across the stack with React.js. Database Management: Design and optimize SQL, NoSQL, and vector databases, specifically PostgreSQL, Redis, and PGVector. Cloud & Infrastructure: Work within the AWS cloud environment and utilize Docker and Kubernetes for containerization and orchestration. API Development: Collaborate on building robust RESTful APIs and modern backend services. AI & DevOps Practices: Apply CI/CD and automated testing workflows, while building Gen AI applications using tools like LangChain and OpenAI APIs. Requirements: Technical Stack: Proven experience with Python (FastAPI) and the ability to work effectively with React.js. Database & Cloud: Hands-on experience with PostgreSQL, Redis, PGVector, and managing infrastructure on AWS. DevOps Tools: Proficiency with Docker, Kubernetes, and implementing automated testing and CI/CD pipelines. API Architecture: Strong understanding of designing and integrating RESTful APIs and backend services. Gen AI Interest: Experience or a strong interest in developing Generative AI applications using LangChain, OpenAI APIs, or similar