Front-End Engineer (React, UX Design)

🏢 Summary: Frontend Developer role focused on building and maintaining modern web applications using React.js. The position involves creating responsive, user-centered interfaces, integrating RESTful APIs, and delivering scalable, maintainable frontend solutions. Emphasis is placed on performance, accessibility, and clean code standards. 🗂️ Requirements: 3–4+ years commercial frontend development experience, Strong hands-on experience with React.js, Proficiency in modern JavaScript (ES6+), Solid knowledge of HTML5 and CSS3, Experience with responsive design principles, Experience integrating RESTful APIs, Understanding of UI/UX best practices, Familiarity with state management, Experience with component-based architecture, Experience with Git and collaborative workflows, Ability to write scalable and maintainable code, Strong debugging and problem-solving skills 📃 Skills: React, JavaScript, ES6, HTML5, CSS3, REST, API, Git, UI, UX 🏢 Description: Responsibilities Develop and maintain modern web applications using React.js . Create responsive and intuitive user interfaces with a strong focus on usability and user experience. Connect frontend applications with RESTful APIs and backend systems. Translate business and design requirements into scalable frontend solutions. Write clean, reusable, and maintainable code following frontend development standards. Collaborate closely with designers, product owners, and backend engineers. Optimize application performance, accessibility, and cross-browser compatibility. Requirements 3–4+ years of commercial experience in frontend development. Strong hands-on experience with React.js and modern JavaScript (ES6+). Solid knowledge of HTML5, CSS3, and responsive design principles. Experience integrating APIs and working with backend services. Understanding of UI/UX best practices and user-centered design. Familiarity with state management and component-based architecture. Experience with Git and collaborative development workflows. Ability to write efficient, scalable, and well-structured frontend code. Strong problem-solving and debugging skills.

🏢 Summary: Backend-focused role involving development of scalable web applications using Java and React/Next.js. The position includes building and optimizing server-side components, APIs, and databases while ensuring performance and security. Close collaboration with cross-functional teams and end-to-end responsibility for backend quality and scalability are expected. 🗂️ Requirements: Minimum 4 years experience in similar role, Proficiency in Java server-side programming, Strong knowledge of React and Next.js, Experience with React Router and Redux, Experience with MySQL, PostgreSQL or MongoDB, Experience building scalable web applications, Knowledge of web performance and security principles, Experience with Git version control, Ability to conduct testing and debugging, English level B2 or higher 📃 Skills: Java, React, Next.js, Redux, ReactRouter, MySQL, PostgreSQL, MongoDB, SQL, NoSQL, API, REST, Git, AWS, Azure, GCP, Docker, NodeJS, Security, Testing 🏢 Description: Responsibilities: Designing, developing, and maintaining the server-side logic of web applications Implementing scalable and efficient server-side components and APIs Build React/Next.js based applications Working with relational and/or NoSQL databases to store and retrieve data efficiently Designing and optimizing database schemas for performance and scalability Integrating third-party APIs and web services to enhance application functionality Developing custom APIs to facilitate communication between front-end and back-end systems Implementing security best practices to protect against common web application vulnerabilities Conducting regular security audits and implement necessary measures Optimization: optimizing server-side code for maximum speed and scalability Monitoring and troubleshooting performance issues Collaborating with front-end developers, UI/UX designers, and other team members to ensure seamless integration of components Using version control systems (e.g., Git) to manage and track changes to the codebase Conducting thorough testing of server-side components to identify and fix bugs Collaborating with QA engineers for comprehensive testing Clear and comprehensive documentation for back-end systems and APIs Requirements: At least 4 years of experience in a similar position Proficiency in Java server-side programming Thorough understanding of React/Next.js core principles along with React router, hooks, Redux (or the like) workflows, Web performance and security Experience with database systems (e.g., MySQL, PostgreSQL, MongoDB) Proven experience in back-end development and building scalable web applications Strong analytical and problem-solving skills with attention to detail Effective communication skills to collaborate with cross-functional teams Ability to adapt to changing project requirements and technologies English at least B2 Nice to have: Familiarity with cloud platforms (e.g., AWS, Azure, GCP) Previous experience in Front-end development with Docker Experience with NodeJS Offer: Private medical care Co-financing for the sports card Constant support of dedicated consultant Employee referral program

🏢 Summary: Full-Stack Front-End Developer role focused on building and enhancing modern, cloud-based web applications with strong emphasis on user experience, performance, and scalability. The position involves developing frontend features in React.js, integrating with Java backend services, and working within AWS environments. The role includes maintaining existing applications, optimizing performance, and contributing to best development practices in an Agile team. 🗂️ Requirements: Minimum 3 years commercial experience with React.js, Minimum 3 years commercial experience with JavaScript, Minimum 3 years commercial experience with TypeScript, Minimum 3 years commercial experience with Java, Minimum 3 years commercial experience with AWS, Experience building responsive web applications, Experience integrating frontend applications with APIs, Understanding of frontend architecture, Knowledge of Agile methodologies 📃 Skills: React.js, JavaScript, TypeScript, Java, AWS, API, Agile 🏢 Description: We are looking for a Full-Stack Front-End Developer who is passionate about building modern, cloud-based applications and delivering excellent user experiences. You will work on developing and maintaining several existing applications and services, focusing on improving usability, performance, and scalability in a cloud environment. Responsibilities Maintain and develop high-quality user experiences across multiple web applications and services. Build and enhance frontend features using React.js and modern JavaScript frameworks. Collaborate with backend services developed in Java . Improve application performance, usability, and responsiveness. Work with cloud-based environments hosted on AWS . Fix bugs, optimize existing solutions, and introduce improvements. Collaborate closely with developers, product teams, and stakeholders. Contribute to code reviews and follow best development practices. Required Skills Minimum 3 years of commercial experience with: React.js JavaScript TypeScript Java AWS Experience building responsive and user-focused web applications. Understanding of frontend architecture and modern UI development practices. Experience integrating frontend applications with APIs. Knowledge of Agile development methodologies. Strong problem-solving and communication skills.

🏢 Summary: Frontend Developer role focused on building and evolving a large-scale, high-performance administrative web platform using React. The position emphasizes scalable architecture, code quality, automated testing, and integration with backend services. You will contribute to architectural decisions and maintain robust, maintainable frontend solutions in an enterprise environment. 🗂️ Requirements: 5+ years frontend development experience, Strong commercial experience with React, Expert knowledge of modern JavaScript (ES2024+), Advanced TypeScript proficiency, Experience integrating REST APIs, Hands-on experience with Webpack and Babel, Proficient with npm or yarn, Strong Git experience, Experience designing scalable frontend architectures, Experience with automated testing (unit, component, E2E) using Jest, React Testing Library, Cypress 📃 Skills: React, JavaScript, TypeScript, REST, Webpack, Babel, npm, yarn, Git, Jest, Cypress, GraphQL 🏢 Description: We are looking for an experienced Frontend Developer passionate about building scalable, high-performance user interfaces. In this role, you will contribute to the development and evolution of a large-scale administrative web platform, ensuring high code quality, maintainability, and performance. Key Requirements 5+ years of experience in frontend development, preferably in complex or enterprise-scale environments Strong commercial experience with React (state management, hooks, component lifecycle, application architecture) Expert knowledge of modern JavaScript (ES2024+) , including asynchronous programming and modular architecture Solid hands-on experience with TypeScript (advanced typing, generics, large-scale React integration) Experience integrating frontend applications with REST APIs (HTTP methods, authentication, data handling) Practical knowledge of build tools such as Webpack, Babel, npm/yarn Strong experience with Git (branching strategies, code reviews, conflict resolution) Experience designing and implementing scalable and high-performance frontend architectures Ability to write automated tests using Jest, React Testing Library, and Cypress Nice to Have Experience working with GraphQL in React-based applications Understanding and practical use of software design patterns Responsibilities Develop and enhance a complex React-based administrative platform Contribute to frontend architecture decisions and scalability improvements Maintain high standards of code quality (Clean Code, SOLID principles) Write and maintain unit, component, and end-to-end tests Collaborate with cross-functional teams in an agile delivery environment

🏢 Summary: Frontend Developer role focused on modernizing and maintaining the UI of a complex structured notes pricing application using ReactJS. The position involves refactoring legacy components, implementing new features in collaboration with backend teams, and improving frontend architecture and CI/CD processes. The work supports a gradual uplift of the existing system while ensuring compatibility with legacy solutions. 🗂️ Requirements: Minimum 5 years of commercial frontend development experience, Strong knowledge of ReactJS including Hooks and ContextAPI, Strong JavaScript proficiency, Practical experience with TypeScript, Experience with modern CSS techniques and preprocessors, Experience with CSS-in-JS or SCSS, Familiarity with webpack and npm, Experience with GitLab or Jenkins, Understanding of testing methodologies, Knowledge of software design principles, Experience with CI/CD workflows 📃 Skills: ReactJS, JavaScript, TypeScript, SCSS, CSS-in-JS, webpack, npm, GitLab, Jenkins, CI/CD, HTML, CSS, Hooks, ContextAPI, Testing, Git 🏢 Description: Join the dynamic international team of professionals split between London and Warsaw. We are looking for an experienced Frontend Developer to help modernize the user interface of a complex pricing application used for structured notes. The role involves working closely with both frontend and backend developers as we uplift the existing UI while maintaining compatibility with the legacy application. Your tasks Develop and maintain user interface components using ReactJS and JavaScript Collaborate with backend developers and strategists to implement features Refactor legacy UI components to align with the new architecture Utilize CSS-in-JS or SCSS for styling and implement responsive designs Participate in code reviews and apply solid design patterns Contribute to improving CI/CD workflows and frontend build processes Requirements Minimum of 5 years of commercial frontend development experience Strong knowledge of ReactJS (including Hooks and Context API) and JavaScript Practical experience with TypeScript, with proficiency in modern CSS techniques and tools Familiarity with modern frontend tooling: webpack, npm, GitLab/Jenkins Understanding of testing methodologies and software design principles Fluency in English (spoken and written) Open to hybrid work (3 days per week in the office) What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: Full-stack development role focused on building and maintaining backend services in Node.js and frontend applications in React.js with Next.js. The position involves designing cloud-based solutions on AWS, integrating CDN services, and managing deployments on Heroku. 🗂️ Requirements: Strong hands-on experience with Node.js, Solid experience with React.js, Practical experience with Next.js, Experience with AWS, Experience with CDN solutions, Experience with Heroku, Very good English proficiency 📃 Skills: Node.js, React.js, Next.js, AWS, CDN, Heroku, JavaScript 🏢 Description: Responsibilities: Develop and maintain backend solutions using Node.js Build and develop frontend components using React.js Work with Next.js for server‑side rendering and frontend architecture Design and integrate solutions deployed on cloud platforms, primarily AWS Work with CDN solutions to support application delivery and performance Support application deployment and hosting on Heroku Collaborate within the development team to deliver end‑to‑end functionality Requirements: Strong hands‑on experience with Node.js Solid frontend development experience with React.js Practical experience with Next.js Experience working with Amazon Web Services (AWS) Experience using CDN solutions Experience with Heroku as an application hosting platform Very good command of English, both spoken and written Offer: Private medical care Co-financing for the sports card Constant support of dedicated consultant Employee referral program

🏢 Summary: Senior Fullstack Developer role focused on building a greenfield solution using Java 17+ and Spring Boot on the backend and React on the frontend. The position involves end-to-end development, architecture co-creation, REST API design, and ensuring code quality within an Agile environment. The role requires close collaboration with business stakeholders and active participation in technical decision-making. 🗂️ Requirements: Minimum 8 years of experience in Java 17+, Minimum 5 years of experience with React, Minimum 5 years of experience with Spring Boot, Minimum 5 years of experience with JPA, Experience in building full-stack applications, Practical experience in REST API design, Experience with relational databases, Experience working in Agile methodology, Ability to analyze business requirements technically, Very good English skills 📃 Skills: Java, Spring, SpringBoot, React, JPA, REST, SQL, Agile, Selenium, Liquibase, Maven, Cucumber 🏢 Description: Responsibilities: Design and development of applications in fullstack architecture (backend + frontend) Creation and development of the backend layer based on Java 17+ and Spring Boot Building and developing the user interface in React with an emphasis on UX and readability Modeling and implementation of the data access layer (JPA) Cooperation with the business team in analyzing and clarifying requirements Breaking down requirements into user stories and estimating work Designing and implementing end-to-end tests Ensuring code quality (code review, best practices, clean code) Co-creating the architecture of a greenfield project solution Collaborating in an Agile environment (refinements, sprint planning, daily, retrospectives) Participating in technological decision-making Requirements: Minimum 8 years of experience in Java programming (version 17+) Minimum 5 years of experience with: React, Spring Boot and JPA Experience in building full-stack applications (backend + frontend) Practical knowledge of REST API design Experience in working with relational databases Ability to work with business requirements and their technical analysis Experience in working with Agile methodology Very good knowledge of English (working in an international environment) Independence, proactivity, and ability to make technical decisions Nice to have: Experience with: Selenium, Liquibase for database versioning, Maven and Cucumber for testing Offer: Private medical care Co-financing for the sports card Constant support of dedicated consultant Employee referral program

🏢 Summary: Senior Fullstack Developer role focused on designing and building a greenfield application using Java 17+ and Spring Boot on the backend and React on the frontend. The position involves end-to-end development, architectural decisions, REST API design, and ensuring code quality within an Agile environment. The role also includes close collaboration with business stakeholders and participation in technical decision-making. 🗂️ Requirements: Minimum 8 years of experience with Java 17+, Minimum 5 years of experience with React, Minimum 5 years of experience with Spring Boot, Minimum 5 years of experience with JPA, Experience building fullstack applications, Practical experience designing REST APIs, Experience with relational databases, Experience working in Agile methodology, Ability to analyze business requirements technically, Very good English proficiency 📃 Skills: Java, Spring, SpringBoot, React, JPA, REST, SQL, Agile, Selenium, Liquibase, Maven, Cucumber 🏢 Description: Responsibilities: Design and development of applications in fullstack architecture (backend + frontend) Creation and development of the backend layer based on Java 17+ and Spring Boot Building and developing the user interface in React with an emphasis on UX and readability Modeling and implementation of the data access layer (JPA) Cooperation with the business team in analyzing and clarifying requirements Breaking down requirements into user stories and estimating work Designing and implementing end-to-end tests Ensuring code quality (code review, best practices, clean code) Co-creating the architecture of a greenfield project solution Collaborating in an Agile environment (refinements, sprint planning, daily, retrospectives) Participating in technological decision-making Requirements: Minimum 8 years of experience in Java programming (version 17+) Minimum 5 years of experience with: React, Spring Boot and JPA Experience in building full-stack applications (backend + frontend) Practical knowledge of REST API design Experience in working with relational databases Ability to work with business requirements and their technical analysis Experience in working with Agile methodology Very good knowledge of English (working in an international environment) Independence, proactivity, and ability to make technical decisions Nice to have: Experience with: Selenium, Liquibase for database versioning, Maven and Cucumber for testing Offer: Private medical care Co-financing for the sports card Constant support of dedicated consultant Employee referral program

🏢 Summary: The offer is for a Front End Developer responsible for building and maintaining responsive, full-stack applications with a strong focus on modern frontend architecture. The role involves working closely with designers and backend engineers to deliver scalable, high-performance digital experiences across web, desktop, and mobile platforms. It requires expertise in React, TypeScript, .NET Core, and modern tooling within a collaborative, partially or fully remote B2B environment. 🗂️ Requirements: Experience with React.js 18, Experience with TypeScript, Experience with .NET Core, Experience with RESTful APIs, Experience with MongoDB or CosmosDB, Experience with SQL Server or MySQL, Experience with Git, Experience with CI/CD pipelines, Experience with cloud platforms, Experience with Entity Framework, Experience with Tailwind CSS, Experience with Redux Toolkit, Experience with Vite or Webpack, Experience with micro-frontend architecture, Experience with Storybook, Experience with monorepos (NX, Turborepo or Lerna), Experience with Vitest 📃 Skills: React, TypeScript, .NET, REST, MongoDB, CosmosDB, SQL, MySQL, Git, CI/CD, Cloud, EntityFramework, Tailwind, Redux, Vite, Webpack, Storybook, NX, Turborepo, Lerna, Vitest 🏢 Description: Description The Front End Developer needs to be able to transform and implement engaging user interfaces. You’ll work closely with UI/UX designers and backend engineers to bring high-quality digital experiences to life, creating seamless user experiences. Responsibilities Implement responsive User Interfaces from design prototypes across web, desktop and mobile applications Ensure responsive Build and maintain full-stack applications using modern frameworks Collaborate with designers, developers, and stakeholders Optimize applications for speed, scalability, maintainability and security Maintain frontend codebases using modern JS framework Requirements Experience in React.js 18 with Typescript for building type-safe component-based UIs for enhanced developer experience, type checking and maintainability Experience in latest MS .NET Core Experience with RESTful APIs Experience with document databases, like MongoDB or CosmoDB Experience with relational databases, like SQL server or MySQL Familiarity with Git, CI/CD pipelines, and cloud platforms Experience with Entity Framework Experience with Tailwind CSS: Utility-first CSS framework for rapid and responsive UI styling, enabling consistent and customizable design systems Experience in Redux Toolkit: State management library for predictable and maintainable global state handling, leveraging RTK Query for data fetching and caching Experience in next generation FE tooling and micro-frontend architecture, such as Vite and Webpack and their respective module federation, for fast development, building, and hot module replacement (HMR), optimized for modern JavaScript frameworks, and implementation of modular, independently deployable frontends using microfrontend patterns, enabling team autonomy and scalable development, and dynamic module loading and sharing Experience in Storybook:, for component-driven development and documentation tool for building, testing, and showcasing UI components in isolation, ensuring reusable and well-documented component libraries Experience in mono-repos, such as NX, Turborepo or Lerna, for efficient code sharing, dependency management, and consistent tooling across multiple applications and libraries Experience in Vitest, a fast, Vite-powered unit testing framework for testing React components, hooks, and utilities in a type-safe environment. Includes support for Jest-compatible APIs and mocking Nice to have Prior experience in the EdTech domain (e-learning platforms, digital classrooms, LMS) Knowledge of learning science, instructional design, or accessibility standards (e.g., WCAG) Familiarity with tools like Moodle, Canvas, Zoom SDK, or Google Classroom integration Working conditions Partly / fully remote B2B contract

🏢 Summary: Senior Frontend Developer role focused on building and evolving high-performance, accessible web interfaces using both React/Next.js and Vue/Nuxt. The position involves autonomous UI/UX decision-making, contributing to frontend architecture, and collaborating closely with backend and product teams in a fully remote setup. Candidates must have strong experience across modern frontend technologies, SSR, testing, and performance optimization. 🗂️ Requirements: 5+ years of frontend development experience, Strong command of React and Next.js, Strong command of Vue and Nuxt, Proficiency in JavaScript and TypeScript, Proficiency in semantic HTML and modern CSS, Experience with SSR and SSG, Experience with unit and/or E2E testing, Ability to design UI/UX without mockups, Experience with Git and continuous integration, Fluent English (spoken and written) 📃 Skills: React, Next.js, Vue, Nuxt, JavaScript, TypeScript, HTML, CSS, Tailwind, CSS-in-JS, SSR, SSG, Vitest, Jest, Playwright, Cypress, Git, CI, Figma, Node.js, REST, GraphQL 🏢 Description: Summary We are seeking a Senior Frontend Developer to design and evolve performant, accessible web interfaces within a collaborative product team. The ideal candidate will possess a strong command of both React/Next.js and Vue/Nuxt ecosystems, ensuring high-quality solutions in complex projects. Main Responsibilities Build, test, and maintain user interfaces across two ecosystems: React/Next.js and Vue/Nuxt. Design and implement interfaces directly, making autonomous UI/UX decisions from product needs (no dedicated designer). Ensure performance (Core Web Vitals), accessibility (WCAG), and code quality. Work closely with back-end and product teams to define the best technical solutions. Participate in code reviews, share best practices, and mentor junior developers. Contribute to frontend architecture and key technical decisions. Key Requirements 5+ years of frontend development experience. Strong command of both React/Next.js and Vue/Nuxt (both required). Excellent command of JavaScript/TypeScript, semantic HTML, and modern CSS (Tailwind, CSS-in-JS or equivalent). Strong UI/UX sensibility: able to design clear, polished interfaces without supplied mockups. Solid understanding of server-side rendering (SSR/SSG) and performance concerns. Experience with unit and/or E2E testing (Vitest, Jest, Playwright, Cypress, etc.). Comfortable with Git, continuous integration, and working in an agile environment. Excellent written communication skills essential in a remote setting. Fluent English required (spoken and written); French is a plus. Nice to Have Strong grasp of design principles (visual hierarchy, typography, spacing) and tools like Figma for rapid prototyping. Experience with a design system/shared component library. Some back-end knowledge (Node.js, REST/GraphQL APIs). Other Details Position Type: 100% Remote Working Hours: Well-defined