Senior JavaScript React Developer (Next.js)

🏢 Summary: Senior React Developer role focused on building and optimizing modern web applications using React, Angular, and TypeScript in a hybrid Warsaw-based environment. The position involves collaborating with cross-functional teams, implementing testing best practices, and working with micro front-end architectures and reactive programming. Candidates will contribute to scalable, high-performance digital products while leveraging modern front-end tools and frameworks. 🗂️ Requirements: 5+ years of front-end web development experience, Strong knowledge of React, Strong knowledge of TypeScript, Experience with Jest, Cypress, or Playwright, Experience building responsive web applications, Knowledge of micro front-end architectures, Experience with RxJS, Experience in agile SDLC environments, Ability to manage multiple projects, Legal right to work in the European Union 📃 Skills: React, Angular, TypeScript, Jest, Cypress, Playwright, RxJS, Webpack, Vite, Vitest, SSR, CSS-in-JS 🏢 Description: Unleash the Future of Web Applications — Drive Innovation with Cutting-Edge Front-End Technologies! Warsaw-based opportunity with hybrid work model (4 days per week in the office) As a Senior React Developer , you will be working for our client, a leader in web application innovation within the technology industry. You’ll contribute to building and executing challenging projects across a variety of initiatives, collaborating closely with stakeholders, UX designers, and development teams to transform requirements into high-impact deliverables. This role offers a unique chance to learn new technologies and continually elevate your skills while shaping the future of digital experiences. Your main responsibilities: Develop and maintain modern, dynamic web applications using React, Angular, and TypeScript. Collaborate with cross-functional teams to translate user requirements into clean, scalable code. Implement best practices in testing using Jest, Cypress, or Playwright to ensure quality and performance. Integrate micro front-end architectures and reactive programming techniques such as RxJS. Optimize applications for maximum speed, scalability, and responsiveness. Contribute to code reviews, documentation, and continuous improvement processes. Leverage modern build tools like Webpack and Vite to streamline development workflows. Stay updated on industry trends and introduce innovative solutions to technical challenges. You're ideal for this role if you have: 5+ years of hands-on experience in front-end web development. Strong expertise in React, TypeScript, and testing frameworks like Jest, Cypress, or Playwright. Proven ability to deliver rich, responsive web applications with clean code. Familiarity with micro front-end architectures and reactive programming, particularly RxJS. Experience working in agile SDLC environments, including research, design, and engineering phases. Excellent communication skills and ability to manage multiple projects simultaneously. Self-motivated, innovative mindset with strong organizational skills. It is a strong plus if you have: Bachelor's degree in Computer Science or related field. Experience with SSR, CSS-in-JS, Vite, Vitest, and Webpack. Knowledge of micro front-end development and advanced build pipelines. Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior React Developer role focused on building and optimizing modern, high-performance web applications using cutting-edge front-end technologies in a hybrid Warsaw-based setup. The position involves delivering scalable solutions, implementing testing best practices, and integrating micro front-end architectures. You will collaborate with cross-functional teams to create responsive, high-quality digital products. 🗂️ Requirements: 5+ years of front-end web development experience, Strong expertise in React and TypeScript, Experience with testing frameworks: Jest, Cypress, or Playwright, Experience building responsive, scalable web applications, Knowledge of micro front-end architectures, Experience with reactive programming and RxJS, Experience with modern build tools, Experience working in Agile SDLC environments, Legal right to work in the European Union 📃 Skills: React, Angular, TypeScript, JavaScript, Jest, Cypress, Playwright, RxJS, Webpack, Vite, Vitest, SSR, CSS-in-JS, Microfrontends, HTML, CSS 🏢 Description: Unleash the Future of Web Applications — Drive Innovation with Cutting-Edge Front-End Technologies! Warsaw-based opportunity with hybrid work model (4 days per week in the office) As a Senior React Developer , you will be working for our client, a leader in web application innovation within the technology industry. You’ll contribute to building and executing challenging projects across a variety of initiatives, collaborating closely with stakeholders, UX designers, and development teams to transform requirements into high-impact deliverables. This role offers a unique chance to learn new technologies and continually elevate your skills while shaping the future of digital experiences. Your main responsibilities: Develop and maintain modern, dynamic web applications using React, Angular, and TypeScript. Collaborate with cross-functional teams to translate user requirements into clean, scalable code. Implement best practices in testing using Jest, Cypress, or Playwright to ensure quality and performance. Integrate micro front-end architectures and reactive programming techniques such as RxJS. Optimize applications for maximum speed, scalability, and responsiveness. Contribute to code reviews, documentation, and continuous improvement processes. Leverage modern build tools like Webpack and Vite to streamline development workflows. Stay updated on industry trends and introduce innovative solutions to technical challenges. You're ideal for this role if you have: 5+ years of hands-on experience in front-end web development. Strong expertise in React, TypeScript, and testing frameworks like Jest, Cypress, or Playwright. Proven ability to deliver rich, responsive web applications with clean code. Familiarity with micro front-end architectures and reactive programming, particularly RxJS. Experience working in agile SDLC environments, including research, design, and engineering phases. Excellent communication skills and ability to manage multiple projects simultaneously. Self-motivated, innovative mindset with strong organizational skills. It is a strong plus if you have: Bachelor's degree in Computer Science or related field. Experience with SSR, CSS-in-JS, Vite, Vitest, and Webpack. Knowledge of micro front-end development and advanced build pipelines. Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior React Developer role focused on building and maintaining modern, scalable web applications in a large international banking environment. The position involves developing high-quality, responsive frontend solutions, ensuring code quality, and supporting production systems within an Agile team. Long-term B2B contract with hybrid work model in Kraków. 🗂️ Requirements: Proven experience delivering web applications, Strong experience building rich frontend/UI layers, Excellent knowledge of React.js, Excellent knowledge of JavaScript, Excellent knowledge of TypeScript, Strong knowledge of HTML5, Strong knowledge of CSS3, Experience with CSS preprocessors (SASS or Less), Experience with Jest, Experience with React Testing Library, Experience creating pixel-perfect UI from detailed specifications, Experience designing responsive interfaces for desktop and mobile, Understanding of accessibility standards, Understanding of cross-browser compatibility, Knowledge of JSON, Knowledge of XML 📃 Skills: React, JavaScript, TypeScript, HTML5, CSS3, SASS, Less, Jest, ReactTestingLibrary, JSON, XML 🏢 Description: Location: Kraków, Poland Work model: Hybrid, 6 days per month in the Kraków office Recruitment process: Test + 1-hour live coding interview in React Contract : B2B, long-term About the role We are looking for a Senior React Developer to join the Business Services Digital team . The team delivers IT solutions and support for Business Services within a large-scale, international banking environment. This is a great opportunity for an experienced frontend engineer who enjoys building high-quality digital products, working in Agile teams, and contributing to modern, scalable web applications in a complex enterprise setting. Your responsibilities Design, develop, test, and implement modern web-based applications Build rich, responsive, and pixel-perfect user interfaces using React Maintain a delivery-oriented approach across application development and supporting software/data infrastructure Manage software releases and support existing systems in production Ensure code quality, maintainability, and full test coverage Contribute to and promote frontend best practices and engineering standards Mentor other team members through knowledge sharing and technical guidance Deliver solutions on time and within budget Follow internal development methodologies, security standards, and documentation requirements Drive productivity and quality improvement initiatives Coordinate releases through to Production Required experience Proven track record in delivering web applications Strong experience building rich frontend/UI layers Excellent knowledge of React.js Excellent knowledge of JavaScript and TypeScript Strong knowledge of HTML5 , CSS3 , and CSS preprocessors such as SASS or Less Experience with frontend testing frameworks such as Jest and React Testing Library Experience creating pixel-perfect UI based on detailed specifications Experience designing responsive interfaces for desktop and mobile applications Good understanding of accessibility and cross-browser compatibility Good knowledge of data marshalling/de-marshalling using JSON and XML Nice to have Experience working with Git Familiarity with IntelliJ and VS Code Good understanding of responsive web techniques Knowledge of Node.js / Express Experience designing digital products in the onboarding or banking domain What makes this opportunity interesting Work on impactful digital solutions in a global banking environment Join a mature engineering team focused on quality, delivery, and best practices Contribute to modern frontend development using React and TypeScript Competitive B2B rate

🏢 Summary: Senior Frontend React Developer role focused on building and optimizing advanced UI applications with generative AI features in an enterprise environment. The position involves collaborating with cross-functional teams to deliver high-quality, user-centric solutions and integrating CI/CD and AI operational workflows. Hybrid work model based in Warsaw. 🗂️ Requirements: 4+ years of experience in React development, 4+ years of experience in JavaScript development, Strong knowledge of DevOps practices, Hands-on experience with Jira, Hands-on experience with GitLab, Hands-on experience with OpenShift, Proficiency in Linux, Experience with unit testing, Experience with system testing, Fluent Polish, Fluent English, Legal right to work in Europe 📃 Skills: React, JavaScript, DevOps, Jira, GitLab, OpenShift, Linux, CI/CD, Agile, Scrum, AI, Testing 🏢 Description: Empower innovation at the forefront of UI and AI technology — craft impactful user experiences that shape the future! Warszawa-based opportunity with hybrid work model (up to 2 remote days per week). As a Senior Frontend React Developer , you will be working for our client, a leader in enterprise software solutions, focusing on delivering cutting-edge UI and generative AI services. Join a collaborative, agile team committed to creating high-quality, user-centric applications that drive digital transformation and innovation. Your main responsibilities: Develop and optimize complex frontend applications using React and JavaScript, ensuring seamless user experiences Collaborate with cross-functional teams including data scientists and DevOps to deliver innovative UI solutions, including generative AI features Confirm technical designs, troubleshoot issues, and implement best practices for code quality and performance Contribute to the integration of CI/CD pipelines and operational workflows involving AI services Participate actively in Agile/Scrum ceremonies, promoting effective teamwork and continuous improvement You're ideal for this role if you have: 4+ years of proven experience in React and JavaScript development Strong understanding of DevOps practices with hands-on experience using Jira, GitLab, and OpenShift Proficiency in Linux OS and performing unit and system testing Excellent command of English, both written and spoken Ability to independently deliver high-quality code and confirm technical designs It is a strong plus if you have: (optional) Experience working with financial data, including Market Data and Reference Data Full-stack development expertise Knowledge of CI/CD pipelines and generative AI operational workflows Language Required for the role: Fluent in Polish and English Eligibility for the role: Only candidates with an existing legal right to work in Europe will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior React Developer role focused on building and maintaining modern, scalable web applications in a large international banking environment. The position involves designing rich, responsive user interfaces, ensuring high code quality, and supporting production releases within Agile teams. It is a long-term B2B contract with hybrid work from Kraków. 🗂️ Requirements: Proven experience delivering web applications, Strong experience building rich frontend/UI layers, Excellent knowledge of React.js, Excellent knowledge of JavaScript and TypeScript, Strong knowledge of HTML5 and CSS3, Experience with CSS preprocessors, Experience with frontend testing frameworks, Ability to create pixel-perfect UI from specifications, Experience designing responsive interfaces, Understanding of accessibility and cross-browser compatibility, Knowledge of JSON and XML data handling 📃 Skills: React, JavaScript, TypeScript, HTML5, CSS3, SASS, Less, Jest, ReactTestingLibrary, JSON, XML, Git, Node.js, Express 🏢 Description: 🌍Work mode: hybrid from Kraków - 6x per month in the office. ⏰Start: ASAP/30 days. 📝Contract: B2B. ⚙️Recruitment process: ·       I stage: 1h live coding React . ·       II stage: test online. ⏳Duration: >12 months contracts. 📕Project language: English. 💼Industry: Banking. 💻Workload: Full time. About the role We are looking for a Senior React Developer to join the Business Services Digital team . The team delivers IT solutions and support for Business Services within a large-scale, international banking environment. This is a great opportunity for an experienced frontend engineer who enjoys building high-quality digital products, working in Agile teams, and contributing to modern, scalable web applications in a complex enterprise setting. Your responsibilities Design, develop, test, and implement modern web-based applications Build rich, responsive, and pixel-perfect user interfaces using React Maintain a delivery-oriented approach across application development and supporting software/data infrastructure Manage software releases and support existing systems in production Ensure code quality, maintainability, and full test coverage Contribute to and promote frontend best practices and engineering standards Mentor other team members through knowledge sharing and technical guidance Deliver solutions on time and within budget Follow internal development methodologies, security standards, and documentation requirements Drive productivity and quality improvement initiatives Coordinate releases through to Production Required experience Proven track record in delivering web applications Strong experience building rich frontend/UI layers Excellent knowledge of React.js Excellent knowledge of JavaScript and TypeScript Strong knowledge of HTML5 , CSS3 , and CSS preprocessors such as SASS or Less Experience with frontend testing frameworks such as Jest and React Testing Library Experience creating pixel-perfect UI based on detailed specifications Experience designing responsive interfaces for desktop and mobile applications Good understanding of accessibility and cross-browser compatibility Good knowledge of data marshalling/de-marshalling using JSON and XML Nice to have Experience working with Git Familiarity with IntelliJ and VS Code Good understanding of responsive web techniques Knowledge of Node.js / Express Experience designing digital products in the onboarding or banking domain What makes this opportunity interesting Work on impactful digital solutions in a global banking environment Join a mature engineering team focused on quality, delivery, and best practices Contribute to modern frontend development using React and TypeScript Competitive B2B rate

🏢 Summary: Long-term remote B2B opportunity for an experienced Fullstack Software Developer to build scalable React/Next.js and Python (FastAPI) applications enhanced with AI/LLM integrations. The role focuses on modern frontend architecture, async backend services, real-time systems, and production-grade AI workflows. You will design end-to-end architectures and deliver secure, high-performance solutions in a distributed engineering team. 🗂️ Requirements: 5+ years experience as Fullstack or Software Engineer, Strong React and Next.js experience in production, Strong TypeScript proficiency, Strong Python experience with async programming, Experience with FastAPI, Experience designing scalable distributed systems and APIs, Knowledge of frontend architecture, state management, performance optimization, Experience with automated testing frameworks, Experience with REST, GraphQL, WebSockets, Hands-on experience integrating AI/LLM services (OpenAI, Azure AI or similar), Experience with LangChain or similar agent frameworks, Strong system design and software architecture knowledge, Experience working in Agile environments, Fluency in English, EU citizenship and residence in Poland 📃 Skills: React, Next.js, TypeScript, Python, FastAPI, Tailwind, Playwright, Vitest, React, Testing, Library, pytest, REST, GraphQL, WebSockets, OpenAI, Azure, LangChain, AI, LLM 🏢 Description: In Cyclad we work with top international IT companies in order to boost their potential in delivering outstanding, cutting-edge technologies that shape the world of the future. We are seeking an experienced Software Developer (React + Python + AI) to join an innovative engineering remote team working on modern full-stack applications enhanced with AI capabilities. In this role, you will contribute to designing scalable systems, building high-performance web applications, and integrating advanced AI/LLM solutions into production environments. Project information: Type of project: IT services Office location: Wrocław, Poland Work mode: Remote from Poland Budget: 130-160 PLN net/ h- b2b Project length: Long-term Only candidates with citizenship in the European Union and residence in Poland Start date: ASAP (depending on candidate’s availability) Project scope: Design and develop modern web applications using React / Next.js and TypeScript Build reusable, scalable, and accessible UI components using Tailwind and modern design systems Drive frontend architecture decisions including state management, modularization, and performance optimization Ensure high-quality frontend delivery with strong test coverage (Playwright, Vitest, React Testing Library) Design and develop backend services using Python (async) and FastAPI Build scalable REST and event-driven APIs as well as real-time systems Implement WebSockets or similar technologies for real-time communication Develop unit, integration, and end-to-end testing strategies for backend systems Design and implement end-to-end system architecture in collaboration with cross-functional teams Integrate services using REST APIs, GraphQL, and WebSockets Participate in performance tuning, scalability improvements, and system optimization Integrate AI/LLM-based solutions using OpenAI / Azure AI services Develop AI workflows using frameworks such as LangChain or similar agent-based tools Apply prompt engineering techniques and optimize model interactions for production use cases Orchestrate multiple AI models and services to deliver real-world intelligent features Apply security and privacy best practices across the full stack Ensure adherence to secure coding standards and maintain high code quality through code reviews and automated testing Collaborate closely with engineering teams to ensure consistency, reliability, and scalability of solutions Competence demands: Minimum 5+ years of experience as a Fullstack or Software Engineer Strong experience with React / Next.js and TypeScript in production-grade applications Strong proficiency in Python (async programming) and FastAPI Experience designing scalable distributed systems and APIs Solid understanding of frontend architecture, performance optimization, and state management Experience with testing frameworks (Playwright, Vitest, React Testing Library, pytest or similar) Familiarity with REST, GraphQL, and WebSockets Hands-on experience integrating AI/LLM services (OpenAI, Azure AI, or similar) Knowledge of agent frameworks such as LangChain or similar tools Strong understanding of system design principles and software architecture Experience working in Agile environments and cross-functional teams Strong communication skills and ability to work in a distributed team Fluency in English (written and spoken) We offer: Remote working model Dynamic and innovation-driven engineering environment Full-time job agreement based on b2b Private medical care with dental care (covering 70% of costs) Multisport card (also for an accompanying person) Life insurance Recruitment process: Introductory call Technical interview Final decision

🏢 Summary: Senior React Front-End Developer role focused on building and maintaining scalable platform-wide React libraries and design system components for a major financial institution. The position involves developing reusable front-end solutions, ensuring quality through testing, and supporting product teams with platform integration. It emphasizes performance, accessibility, and high engineering standards within a hybrid work model. 🗂️ Requirements: 5+ years of experience in front-end development with React, Strong expertise in JavaScript and TypeScript, Experience building and maintaining scalable front-end applications and NPM packages, Experience with unit and end-to-end testing, Proficient use of Git including advanced branch and commit management, Knowledge of accessibility standards and WCAG, Experience with Jira, Confluence, and Bitbucket, Good command of Polish and communicative English, Legal right to work in the European Union 📃 Skills: React, JavaScript, TypeScript, NPM, CSS, Jest, Testing, Cypress, Git, WCAG, Jira, Confluence, Bitbucket, ReactNative, Capacitor, WebView 🏢 Description: Empower innovation at scale — shape the future of front-end technology! Warszawa-based opportunity with hybrid work model As a Senior React Front-End Developer – Platform Integration and Design Systems , you will be working for our client, a leading financial institution, delivering robust and scalable front-end solutions. Join a team committed to building advanced platform components that empower seamless user experiences and drive digital transformation. Your main responsibilities: Develop and maintain platform-wide React libraries and components aligned with the Bank’s Design System. Implement and optimize generic functionalities and innovative technical solutions for front-end teams. Write and sustain comprehensive unit and end-to-end tests to ensure high-quality deliverables. Ensure consistency, performance, and accessibility standards are upheld across all solutions. Collaborate with cross-functional platform teams and UI/UX designers to refine components and share best practices. Provide technical guidance and support to product teams utilizing the platform solutions. Maintain clear and detailed documentation for developed components and functionalities. You're ideal for this role if you have: Over 5 years of professional experience in front-end development with React. Strong expertise in JavaScript, TypeScript, NPM, and CSS. Proven experience in building and maintaining scalable front-end applications and NPM packages. Strong knowledge of unit and end-to-end testing (e.g., Jest, Testing Library, Cypress). Proficient use of the Git version control system, including managing branches and commits (rebase, cherry-pick, revert, squash, changing commit order and descriptions). Good understanding of accessibility principles (a11y), WCAG standards, and building accessible interfaces. Experience working with Jira, Confluence, and Bitbucket. It is a strong plus if you have: Experience working with design systems or contributing to their development. Knowledge of microfrontend architecture and integration challenges. Experience with hybrid mobile applications such as React Native, Capacitor, or WebView. Familiarity with AI tools or agents in software development projects. Language required for the role: Good command of Polish and Communicative English. Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior Frontend Developer role focused on building advanced web applications using React, Angular, and TypeScript in a hybrid Warsaw-based environment. The position involves delivering complex front-end projects, collaborating with cross-functional teams, and implementing scalable, future-oriented solutions. Candidates should have strong experience in modern frontend development and clean coding practices. 🗂️ Requirements: 5+ years of experience developing web applications, Strong expertise in React, Experience with Angular, Proficiency in TypeScript, Ability to write clean, tested, and maintainable code, Strong analytical and problem-solving skills, Ability to manage multiple projects simultaneously, Communicative level of English, Legal right to work in the European Union 📃 Skills: React, Angular, TypeScript, RxJS, Webpack, Vite, JavaScript, HTML, CSS 🏢 Description: Unleash the Power of Frontend Innovation — Drive Impactful Web Applications that Transform User Experiences! Warszawa-based opportunity with hybrid work model (up to 2 remote days per week). As a Senior React & Angular Frontend Developer , you will be working for our client, an industry leader in digital solutions focused on delivering advanced web applications. Your expertise will help build and execute complex projects that shape the future of digital interactions. Join a team dedicated to innovation, technical excellence, and long-term value creation. Your main responsibilities: Build and deliver challenging front-end projects across multiple initiatives, ensuring high-quality outputs. Collaborate effectively with stakeholders, UX Designers, and development teams to gather requirements and translate them into functional deliverables. Continuously learn emerging technologies and integrate them into your projects. Innovate and implement technical solutions with a future-oriented perspective. Maintain clean code practices and testing methodologies to ensure robust, scalable applications. Manage multiple projects efficiently within a fast-paced and collaborative environment. You're ideal for this role if you have: Over 5 years of hands-on experience developing rich web applications. Strong expertise in React (mandatory), Angular, and TypeScript. Proven ability to write clean, tested, and maintainable code. Excellent interpersonal, communication, and organizational skills. Capacity to manage multiple projects simultaneously with high analytical and problem-solving skills. Self-motivated, self-managed, and eager to innovate. It is a strong plus if you have: Bachelor's degree in Computer Science or a related field. Experience working within delivery-driven agile SDLC cycles. Knowledge of micro front-end architectures. Familiarity with reactive programming frameworks such as RxJS. Experience with front-end build tools like Webpack and Vite. Language Required for the role: Communicative level of English Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Opportunity for a Senior Front-End Developer to modernize and scale an existing web interface using React and Next.js. The role focuses on building high-quality, responsive UI components, integrating with backend services, and driving front-end architecture and best practices. You will collaborate with backend and data teams while ensuring performance, scalability, and code quality. 🗂️ Requirements: Minimum 5 years of hands-on experience with React and Next.js, Strong proficiency in JavaScript and TypeScript, Strong knowledge of HTML and CSS, Experience with RESTful APIs integration, Understanding of modern front-end architecture and design patterns, Experience with front-end testing frameworks, Experience with build tools, Ability to troubleshoot and resolve UI and performance issues 📃 Skills: React, Next.js, JavaScript, TypeScript, HTML, CSS, REST, gRPC-Web, CI/CD, Testing 🏢 Description: Senior Front-End Developer (React / Next.js) We are looking for a Front-End Developer to join a technology-focused team working on modern web applications. This role will play a key part in transforming an existing user interface into a modern, scalable front-end built with React and Next.js. You will be responsible for delivering responsive, high-quality user interfaces and contributing to the long-term evolution of the UI platform. The position involves close collaboration with backend and data teams, as well as ownership of front-end standards and best practices within the team. Responsibilities Redesign and modernize an existing web interface using React and Next.js Build reusable, maintainable UI components with TypeScript Act as a front-end subject matter expert, supporting ongoing improvements to usability and performance Integrate front-end applications with backend services via REST APIs (gRPC-Web knowledge is a plus) Identify, troubleshoot, and resolve UI and performance issues Contribute to code reviews, technical discussions, and CI/CD processes Ensure high code quality through testing, documentation, and adherence to best practices Required Skills & Experience Min. 5 years of hands-on experience with React and Next.js Strong proficiency in JavaScript/TypeScript, HTML, and CSS Solid understanding of modern front-end architecture and development patterns Experience working with RESTful APIs Familiarity with front-end testing frameworks and build tools is an advantage Experience in finances/banking - nice to have

🏢 Summary: Offer for an experienced React FrontEnd Developer to design and build responsive, high-performance user interfaces in a hybrid model in Warsaw. The role focuses on developing modern web applications using React and related technologies, with strong emphasis on testing, accessibility, and performance optimization. The position involves close collaboration with cross-functional teams to deliver robust, user-centric digital products. 🗂️ Requirements: 6+ years of experience in JavaScript development, 6+ years of experience in TypeScript development, Commercial experience with React.js, Experience with Redux, Hands-on experience with HTML5, Hands-on experience with CSS3, Ability to write cross-browser compatible code, Understanding of object-oriented programming concepts and design patterns, Knowledge of functional programming paradigms, Understanding of asynchronous programming, Experience with TDD, Experience with continuous integration, Knowledge of Git and branch management, Experience with front-end debugging tools, Experience working in Agile methodology 📃 Skills: JavaScript, TypeScript, React, Redux, Next.js, HTML5, CSS3, Git, TDD, CI, OOP, FP 🏢 Description: React FrontEnd Developer IT · Warsaw (City Center) · Hybrid About the Client Our Client is a fast-growing, international technology company that provides innovative digital solutions for the global market. They are currently expanding and developing their R&D center in Warsaw. They are a leader in AI-powered enterprise operations, delivering digital solutions and consulting services that drive value and transform businesses. They specialize in using advanced technology to streamline operations, improve efficiency, and unlock new revenue opportunities, particularly within the private capital markets. With over a decade of experience supporting high-growth companies, they bring deep domain expertise and a proven ability to turn technology into a strategic advantage. Role Overview We are seeking a skilled React FrontEnd Developer to design and develop responsive user interfaces. In this role, you will collaborate with cross-functional teams to deliver robust, user-centric solutions while driving best practices in testing, accessibility, and performance optimization. Key Responsibilities UI Development: Designing and developing responsive user interfaces using React Testing & Integration: Implementing and maintaining TDD in applications and continuous integration. Driving best practices in testing, accessibility, and performance optimization. Collaboration: Collaborating with a cross-functional team of project managers, project analysts, and sales staff to deliver high-quality, interactive products on time. Collaborating cross-functionally with design, backend, QA, and product teams to deliver robust and user-centric solutions. Requirements & Qualifications Experience & Education: 6+ years of experience in JavaScript and TypeScript development. A Bachelor's degree in Computer Science or equivalent is preferred. Core Tech Stack: Must know a modern front-end JS framework, such as React.js + Redux; Next.js is a bonus. Hands-on experience with HTML5, CSS3. Proficiency in writing cross-browser compatible code. Programming Paradigms: Should understand OO concepts and design patterns, and their application to JavaScript development. Knows functional programming paradigms. Understands asynchronous programming paradigms and best practices. Tools & Debugging: Git and branch management knowledge. Experience debugging front-end problems and a knowledge of front-end debugging tools. Familiarity with custom package creation and integration. Soft Skills & Methodology: Experience with Agile methodologies and development practices. Good communication skills and good organization skills. Ability to work under pressure and deliver against tight deadlines. What Is Offered Compensation: Monthly compensation up to $4,800 USD . Contract Type: B2B contract via Optiveum. Work Model: Hybrid (3 days working from the office located in the center of Warsaw, 2 days working from home). Stability: Long-term cooperation with a stable, international organization.