JavaScript / Mashup Developer

🏢 Summary: Senior Mashup Developer role focused on building advanced ReactJS applications with Qliksense integration and AI-assisted development tools. The position involves developing reusable UI components, implementing state management, ensuring code quality through testing, and addressing security vulnerabilities in an Agile environment. Hybrid B2B contract with flexible on-site presence in Warszawa or Kraków. 🗂️ Requirements: Minimum 10 years of experience with ReactJS (16.x or above), Hands-on experience with AI developer tools (e.g., GitHub Copilot), Strong expertise in Typescript and ES6, Experience with D3.js and AG-Grid, Solid knowledge of React Hooks and Redux, Proficiency in HTML5, CSS3, Bootstrap, and media queries, Strong understanding of Material-UI or similar React UI libraries, Experience with Websockets and Enigma JS, Familiarity with Qlik API integration, Experience with unit testing using Jest and Enzyme 📃 Skills: ReactJS, Typescript, ES6, D3.js, AG-Grid, Redux, HTML5, CSS3, Bootstrap, Material-UI, Websockets, EnigmaJS, Qlik, Jest, Enzyme, GitHubCopilot, Jira, Jenkins, Ansible, Webpack, Axios, Fetch 🏢 Description: Summary: We are seeking a highly experienced Mashup Developer with a minimum of 10 years of expertise in ReactJS (16.x or above). The ideal candidate must demonstrate strong proficiency in Typescript, ES6, and AI tools such as GitHub Copilot. A solid foundation in D3.js, AG-Grid, and integrating Qliksense API with React is crucial. This role demands innovative problem-solving skills and the ability to create user-friendly interfaces. What we offer: Hybrid 6 days per month ( flexible) from Warszawa or Kraków Rate: 180 PLN/ H + VAT B2B Contract Main Responsibilities: Develop robust applications using ReactJS and integrating various components. Utilize AI tools for efficient development and coding practices. Implement state management using React Redux and middleware. Construct generic UI components for various applications. Integrate Qliksense API with the React layer seamlessly. Ensure high-quality code through unit testing frameworks. Work collaboratively in an Agile environment utilizing tools like Jira and Jenkins. Identify and address security vulnerabilities in the code. Key Requirements: Minimum 10 years of experience in ReactJS (16.x or above). Hands-on experience with AI developer tools (e.g., GitHub Copilot). Strong expertise in Typescript and ES6. Experience with D3.js and AG-Grid. Solid knowledge of React Hooks and Redux. Proficient in HTML5, CSS3, and Bootstrap with media query exposure. Strong understanding of Material-UI or similar React UI libraries. Experience with Websockets and Enigma JS. Familiarity with Qlik API integration. Experience with unit testing using Jest and Enzyme. Nice to Have: Experience with Axios and Fetch for API calls. Exposure to Module Federation using Webpack. Knowledge in utilising Jira, Jenkins, and Ansible for automated deployments. Familiarity with security vulnerability identification and remediation. Understanding of MI reporting platforms.

🏢 Summary: Hybrid B2B opportunity for a senior JavaScript (React/TypeScript) Mashup Developer to join a financial sector project in Kraków. The role focuses on building advanced UI components, integrating QlikSense APIs, and working with modern frontend technologies and AI-assisted development tools. The position requires deep expertise in React, data visualization, API integration, and automated deployment practices. 🗂️ Requirements: 10+ years experience with ReactJS 16.x+, Strong experience with TypeScript and ES6, Strong experience with D3.js, Strong experience with AG-Grid, Proficiency with React Hooks and React Redux (including thunk middleware), Very good knowledge of HTML5, CSS3, Bootstrap, Media Queries, Experience with Material-UI or other React UI libraries, Strong knowledge of Enigma.js, Experience with WebSockets, Experience integrating QlikSense API with React, Experience with Jest and Enzyme for unit testing, Experience with Webpack Module Federation, Experience with Axios or fetch for API calls, Experience with Jira, Jenkins, Ansible for automated deployments, Experience with GitHub or other source control systems, Ability to identify and fix security vulnerabilities in code, Knowledge of MI reporting platforms, Fluent English (spoken and written) 📃 Skills: JavaScript, React, TypeScript, ES6, D3.js, AG-Grid, Redux, Thunk, HTML5, CSS3, Bootstrap, Material-UI, Enigma.js, WebSockets, QlikSense, Qlik, Jest, Enzyme, Webpack, ModuleFederation, Axios, Fetch, Jira, Jenkins, Ansible, GitHub 🏢 Description: For our Client we are looking for an experienced JavaScript (React, Typescript)/ Mashup Developer. 📍 Location : Kraków, hybrid work model – 2 days per week in the office, 3 days remote 🕒 Cooperation model: [Full-time / B2B] 📍 Project for our Client from the financial sector Requirements: 10+ years of experience on ReactJs 16.x or above Hands on experience of using AI tools (GitHub CoPilot, Claude etc.) for carrying out developer work Strong experience primarily on Typescript and ES6 Strong Experience on D3 js Strong Experience on AG-Grid Library Strong knowledge on React Hooks, React Redux, middleware like thunk etc. Excellent knowledge of HTML5, CSS3, bootstrap (also should have exposure on Media Query) Should be able to work on Material-UI or React specific UI libraries Strong understanding on Enigma Js Strong Understanding on WebSocket’s Strong understanding of integrating Qliksense API with react layer Good to have experience in Qlik API Integration Good experience on Unit testing using Jest and Enzyme Should be able to build generic UI component Experience on Module Federation using Webpack Strong Experience on Axios, fetch like libraries for API Calling Experience of using Jira/Jenkins/Ansible for automated deployments GitHub or other automated source code control and release software Security Vulnerability identification and fixing them in code Knowledge of MI reporting platforms Fluency in English (both spoken and written) Benefits: Private medical care (Luxmed) Multisport card Collaborative team culture and modern tech stack Why apply for an Antal job offer? When your application is successful, you will be supported by a dedicated Consultant who will stay in regular contact with you (via email or phone), help you prepare for interviews with your future employer, and ensure a smooth and professional recruitment process. About Antal Antal is a leading recruitment and HR advisory company, present in Poland since 1996 and later expanded to the Czech Republic and Hungary. Across the CEE region, we employ around 150 professionals who deliver a full range of services – from specialist and executive recruitment, employee outsourcing and HR consulting, to employer branding and market research. Our division-based structure combines deep industry expertise with functional specialisation, enabling us to provide tailored solutions for companies in every sector. We act as a trusted partner for both employers and candidates, sharing our knowledge and guiding them through every stage of the talent journey. We connect exceptional people with the right opportunities and help organisations build successful teams. Discover our latest job openings: https://en.antal.pl/candidates Follow us on LinkedIn: https://www.linkedin.com/company/antalpoland

🏢 Summary: Long-term hybrid opportunity for a senior React Developer to build highly responsive, data-intensive user interfaces for a financial sector client. The role focuses on developing scalable front-end solutions in real-time, high-volume environments using modern engineering best practices. 🗂️ Requirements: 7+ years of professional experience, Bachelor’s or Master’s degree in Computer Science or related field, Strong experience with React, Strong experience with TypeScript and JavaScript, Strong experience with state management, Strong experience with data visualisation, Strong experience with CSS3, Experience building responsive UI for large data sets, Experience in real-time, high-volume systems, Experience with TDD and BDD, Experience with UI test automation frameworks, Experience integrating with RESTful APIs, Understanding of event-driven microservices, Experience with Cloud architecture, Experience with Agile and DevOps practices, Commitment to Clean Code and engineering best practices 📃 Skills: React, TypeScript, JavaScript, CSS3, Redux, REST, C#, Microservices, Azure, TDD, BDD, DevOps, Agile, UI, Cloud 🏢 Description: React Developer We are currently looking for experienced React Developers to join a long-term project with one of our international clients in the financial sector. Location: Wroclaw, Poland (Hybrid – 3 days per week from the office) Experience: 7+ years Requirements: • Bachelor’s and/or Master’s degree or equivalent focusing on Computer Science, Computer Engineering or a related technical discipline. • Strong experience with React and TypeScript/JavaScript. • Strong experience with state management and data visualisation. • Strong experience with CSS3 and JavaScript. • Experience with developing highly responsive user interface components with large data sets, that work in high-volume, real-time environments. • Experience with TDD, BDD and UI Test Automation Frameworks. • UX Design, Interaction and/or Visual Design experience to prototype scenarios and end-to-end experiences with product owners and business stakeholders. • Experience integrating the front end with C# RESTful APIs and event driven microservices is beneficial. • Experience with Cloud architecture and engineering is beneficial, ideally on Microsoft Azure. • Agile, Test Driven Development and DevOps practices are part of your DNA. • A Software Craftsperson focused on engineering best practices and delivering Clean Code. • Good communication skills – both written and verbal. • Strong analytical and problem-solving skills, you like to figure out how things work. • Keen interest in understanding how the business works. • Passion for learning and innovation. 📩 If you’re interested and meet the qualifications, please send your CV to Alina Pchelnikova at alina.pchelnikova@dcvtechnologies.co.uk

🏢 Summary: Frontend role focused on building and enhancing secure API integrations with external brokers using React and TypeScript in a hybrid B2B model. The position involves developing reusable UI components, collaborating with backend teams on financial API integrations, and contributing to code quality in a Scrum environment. 🗂️ Requirements: Experience in frontend development, Proficiency in React, Proficiency in TypeScript, Knowledge of REST APIs, Knowledge of JSON, Ability to work in Scrum teams, Experience with performance standards, Experience with accessibility standards, Collaboration skills, Communication skills 📃 Skills: React, TypeScript, REST, JSON, Scrum, Node.js, CI/CD, Postman 🏢 Description: General info: - Model of work: hybrid, 1x per week work from office in Warsaw - Type of contract: B2B contract - Rate: 130 PLN net + VAT / hour Introduction & Summary: Role requires expertise in frontend development to create and enhance API integrations with external brokers. Ideal candidate should have a strong proficiency in React and TypeScript. You will contribute to building user-friendly and secure interfaces, ensuring smooth integration with partners while adhering to high-quality standards. Main Responsibilities: - Develop reusable, high-quality React + TypeScript components for plugins and internal tools - Work closely with backend engineers to integrate with payment and financial APIs - Ensure performance, accessibility, and responsiveness on partner websites - Contribute to code quality through testing and code reviews - Participate in two-week sprints using Scrum methodology - Collaborate with the Product Owner for requirement clarification - Engage in continuous learning and knowledge sharing within the team Key Requirements: - Proven experience in frontend development - Proficiency in React and TypeScript - Familiarity with REST APIs and JSON - Ability to work in Scrum teams - Experience with performance and accessibility standards - Good collaboration and communication skills Nice to Have: - Knowledge of Node.js - Experience with CI/CD pipelines - Familiarity with tools like Postman - Experience in building embeddable widgets/plugins - Understanding of security and compliance in financial products

🏢 Summary: Senior Full Stack Developer role focused primarily on backend development with Python and FAST API, combined with React-based frontend work in a hybrid B2B model. The position involves designing scalable web applications, building high-performance APIs, and working with relational and NoSQL databases. Strong backend expertise is essential, with intermediate frontend skills and experience in modern DevOps practices. 🗂️ Requirements: 8+ years of professional software development experience, Expert proficiency in Python, Strong experience with FAST API, Strong knowledge of relational and NoSQL databases, Experience with SQLAlchemy ORM, Deep understanding of data structures and algorithms, Experience building RESTful APIs and microservices, Proficiency in writing unit and integration tests in Python, Strong knowledge of ReactJS and NodeJS, Experience with Redux or MobX, Familiarity with React Query, Experience with Material UI, CSS, and HTML, Experience with Jest and Cypress, Solid understanding of JavaScript and TypeScript 📃 Skills: Python, FASTAPI, SQLAlchemy, PostgreSQL, MySQL, MongoDB, DynamoDB, ReactJS, NodeJS, Redux, MobX, ReactQuery, MaterialUI, CSS, HTML, Jest, Cypress, JavaScript, TypeScript, Docker, Kubernetes, AWS, Azure, GCP, RabbitMQ, Kafka 🏢 Description: Working mode: Hybrid mode ( 2-3 days in a week from the office in Wroclaw or Warsaw) Experience Level: 8+ Years Contract Type: B2B About the Role We are looking for a highly skilled Senior Full Stack Developer with a primary focus on Python and FAST API to join the development team. The ideal candidate is a Python expert capable of architecting robust backend services. While React skills are required, we are flexible regarding the depth of frontend expertise (Intermediate level is acceptable), provided the backend strength is exceptional. Key Responsibilities Backend Architecture: Design, develop, and maintain scalable web applications using Python and FAST API . API Development: Build high-performance RESTful APIs and microservices, ensuring low latency and high availability. Database Management: Work with relational and NoSQL databases, utilizing ORMs like SQLAlchemy to design efficient database schemas and queries. Frontend Development: Develop and maintain user-facing features using ReactJS , ensuring the technical feasibility of UI/UX designs. Code Quality: Write clean, maintainable, and testable code; perform unit testing to ensure robustness. DevOps: Implement and manage CI/CD pipelines to streamline deployment processes. Collaboration: Work closely with cross-functional teams (Product, QA, and Design) in a hybrid working environment. Mandatory Technical Skills 1. Backend (Core Strength): Languages: Expert proficiency in Python . Frameworks: Strong experience with FAST API (Must-have). Experience with SQLAlchemy is highly preferred. Fundamentals: Deep understanding of data structures, algorithms, and space-time complexity. Database: Strong understanding of Relational (e.g., PostgreSQL, MySQL) and NoSQL (e.g., MongoDB, DynamoDB) databases. Testing: Proficiency in writing unit tests and integration tests for Python applications. 2. Frontend (Intermediate Level): Libraries: Strong knowledge of ReactJS and NodeJS . State Management: Experience with React workflows such as Redux or MobX . Tooling: Familiarity with React Query . Styling: Experience with Material UI , CSS , and HTML . Testing: Experience with frontend testing tools like Jest and Cypress . JavaScript: Solid understanding of JavaScript , TypeScript , and browser rendering behavior. Good to Have Experience with cloud platforms (AWS, Azure, or GCP). Knowledge of containerization (Docker, Kubernetes). Understanding of microservices architecture and message queues (RabbitMQ, Kafka).

🏢 Summary: Mid-level Full-stack Developer role focused on building and maintaining web and mobile applications using React and .NET technologies. The position involves developing scalable backend services, microservices, and SEO-friendly frontends integrated with CMS, within a multinational Agile environment. The role combines frontend, backend, cloud, and DevOps responsibilities with regular team collaboration. 🗂️ Requirements: 2–4 years experience as FullStack Developer, .NET 8/10 proficiency, C# proficiency, Strong React knowledge, JavaScript proficiency, TypeScript proficiency, HTML5 knowledge, CSS3 knowledge, Experience with RESTful APIs, Experience with Git, Experience with Microsoft Azure (Functions, Durable Functions, CosmosDB, ServiceBus, Application Insights), Experience with CI/CD pipelines, Experience with Agile methodologies, Communicative English (B2+) 📃 Skills: .NET, C#, React, JavaScript, TypeScript, HTML5, CSS3, REST, Git, Azure, Functions, CosmosDB, ServiceBus, ApplicationInsights, CI/CD, ReactNative, Expo, Sanity, GROQ, Redux, RxJS, Tanstack, Sentry, Firebase, Analytics 🏢 Description: Join Our Team as a Full-stack Developer (React, C#)! We are seeking a talented Mid FullStack Developer proficient in .NET and React to join our team. As part of our company culture, we value collaboration and regular in-person interactions. Our team meets every two months in our Poznań office for informal gatherings to connect, share ideas, and strengthen teamwork in a relaxed setting. You will work in multinational environment and will be responsible for designing and implementing software solutions, utilizing both front-end and back-end technologies. This role requires strong problem-solving skills, excellent communication abilities, and a passion for delivering high-quality code. Ready to take the next step in your career? Apply now and join us! Key Responsibilities: • Design and develop SEO-friendly web application, based on React and TypeScript and integrated with Sanity CMS. • Contributing to a mobile application using React Native, TypeScript and Expo . • Build and maintain microservices to enhance the web experience, including features like roadside assistance, car repair bookings, and membership management. • Develop robust and scalable backend systems using .NET 8/10, Azure ServiceBus, Functions, CosmosDB and more. • Utilize Sentry for error monitoring and Google Analytics/Firebase to track user behaviour and optimize performance. Requirements : Proven experience (2-4 years) as a FullStack Developer Proficiency in .NET (preferably .NET 8/10), C# Strong understanding of front-end technologies, including React, JavaScript, TypeScript, HTML5, and CSS3 Practical knowledge of clean-code principles and patterns, drive to write clean, testable and maintainable code Experience with RESTful APIs and Web Services Knowledge of version control systems, such as Git Excellent problem-solving and analytical skills Familiarity with Microsoft Azure platform (Functions and Durable Functions, CosmosDb, ServiceBus, Application Insights) Experience with DevOps approach and CI/CD pipelines Strong communication and interpersonal skills, communicative English (B2+) Experience with Agile development methodologies Nice to have: Experience in working with Sanity CMS and GROQ query language (or any other headless CMS) Familiarity with Figma or similar tools At least basic knowledge about Server Side Rendering and libraries like: Redux, RxJS, Tanstack Experience in working with mobile apps and practical knowledge of React Native, Expo, Expo Application Services Knowledge of microservices architecture and software integration patterns We offer: Conference/workshop budget of approximately 10000 PLN!- the budget renews every year and can be used for conferences, workshops, training programs, certifications, studies, or other development initiatives. "Fabresikowe": one-time 1000 PLN bonus to create your work space more comfortable and more tailored to your needs! Relaxing office massages In-house trainings Team events Frequent company events Free breakfast every day Free beverages, fresh fruit, snacks Chill out room English and Norwegian classes

🏢 Summary: Offer for a React Developer with at least one year of commercial experience to build modern web applications. The role focuses on developing frontend solutions, building reusable components, and integrating applications with backend services via REST APIs. 🗂️ Requirements: Minimum 1 year commercial experience with React, Very good knowledge of JavaScript (ES6+), Practical experience with HTML5 and CSS3, Knowledge of component-based architecture, Experience with state management in React, Ability to integrate frontend with REST APIs 📃 Skills: React, JavaScript, ES6, HTML5, CSS3, REST, API 🏢 Description: Poszukujemy osoby z zakresu React Developer , która dołączy do zespołu realizującego nowoczesne aplikacje webowe. Szukamy osoby z pierwszym, komercyjnym doświadczeniem, gotowej do dalszego rozwoju w pracy projektowej. Wymagania Minimum 1 rok komercyjnego doświadczenia w tworzeniu aplikacji w React , Bardzo dobra znajomość JavaScript (ES6+) , Praktyczne doświadczenie w pracy z HTML5 i CSS3 , Znajomość zasad budowania komponentów oraz zarządzania stanem aplikacji, Umiejętność pracy z API (REST) i integracji frontend–backend. Mile widziane Znajomość TypeScript , Doświadczenie z bibliotekami do zarządzania stanem (Redux, Zustand), Podstawowa znajomość testów frontendowych, Doświadczenie w pracy w zespołach zwinnych (Scrum / Kanban). Oferujemy Udział w ciekawych projektach dopasowanych do kompetencji, Możliwość dalszego rozwoju w obszarze frontendowym, Wsparcie doświadczonego zespołu developerskiego, Stabilną współpracę i przyjazne środowisko pracy.

🏢 Summary: Hybrid Java & React.js Developer role focused on building and maintaining scalable web applications, covering both backend services and modern frontend interfaces. The position involves developing RESTful APIs, implementing responsive UIs, and supporting integration and deployment through CI/CD pipelines. 🗂️ Requirements: Strong experience with Java, Solid experience with React.js, Experience building and consuming REST APIs, Strong knowledge of JavaScript, Strong knowledge of HTML, Strong knowledge of CSS, Experience with Git, Experience with CI/CD pipelines 📃 Skills: Java, React.js, JavaScript, HTML, CSS, REST, Git, CI/CD 🏢 Description: We are looking for an experienced Java & React.js Developer to join our development team in Kraków. In this role, you will work on building and maintaining scalable web applications, contributing to both backend services and modern frontend interfaces. This position follows a hybrid working model with two/three days per week onsite in Kraków . Key Responsibilities Develop and maintain backend services using Java Build responsive and modern user interfaces using React.js Design and implement RESTful APIs Collaborate with product managers, designers, and engineers to deliver new features Write clean, maintainable, and efficient code Participate in code reviews and contribute to development best practices Troubleshoot and resolve technical issues Support integration and deployment through CI/CD pipelines Required Skills and Experience Strong experience with Java Solid experience with React.js Experience building and consuming REST APIs Strong knowledge of JavaScript, HTML, and CSS Experience with Git and modern development workflows Familiarity with Agile development environments Good communication skills in English Nice to Have Experience with Spring Boot Experience with TypeScript Knowledge of SQL databases Familiarity with Docker or cloud platforms Work Model Hybrid: 2 days onsite in Kraków , remaining days remote.

🏢 Summary: Senior React Developer role in the banking sector focused on delivering scalable, high-quality front-end and platform solutions. The position involves building and maintaining reusable components, ensuring accessibility compliance, and implementing comprehensive unit and e2e testing. The developer will also support other teams with front-end best practices and technical expertise. 🗂️ Requirements: Minimum 5 years of professional experience, Experience in banking or financial sector, Very good knowledge of React, Very good knowledge of JavaScript, Very good knowledge of TypeScript, Very good knowledge of CSS, Experience in building scalable front-end applications, Experience in creating and maintaining NPM packages, Strong knowledge of unit testing, Strong knowledge of e2e testing, Ability to write and refactor tests using Jest, Testing Library, Cypress, Proficiency with Git, Knowledge of Accessibility (a11y) principles, Ability to build interfaces compliant with WCAG, Experience with Jira, Experience with Confluence, Experience with Bitbucket 📃 Skills: React, JavaScript, TypeScript, CSS, NPM, Jest, TestingLibrary, Cypress, Git, WCAG, Accessibility, Jira, Confluence, Bitbucket 🏢 Description: umowa: B2B stawka: 185 zł/h + VAT tryb: hybryda, 1 dzień w tygodniu (środa) z biura w Warszawie branża: bankowość Poszukujemy Senior React Developera, który posiada bardzo dobrą znajomość technologii webowych oraz umiejętność współpracy w zespole. Wymagana jest biegłość w React, JavaScript, TypeScript oraz CSS, a także znajomość testów jednostkowych i dobrych praktyk w zakresie dostępności. Idealny kandydat to osoba, która potrafi dostarczać wysokiej jakości rozwiązania techniczne oraz wspierać inne zespoły. Główne obowiązki Dostarczanie generycznych i platformowych rozwiązań dla zespołów front-endowych. Pisanie i utrzymanie testów jednostkowych oraz e2e. Dbanie o spójność i wysoką jakość dostarczanych rozwiązań. Naprawa błędów. Współpraca z innymi zespołami platformowymi i projektantami. Wsparcie merytoryczne zespołów w ramach szeroko rozumianego front-endu. Tworzenie i utrzymywanie dokumentacji. Kluczowe wymagania Minimum 5 lat doświadczenia zawodowego. Doświadczenie w sektorze bankowym/finansowym. Bardzo dobra znajomość React, JavaScript, TypeScript, NPM oraz CSS. Doświadczenie w tworzeniu i utrzymywaniu skalowalnych aplikacji front-endowych oraz paczek NPM. Bardzo dobra znajomość testów jednostkowych oraz e2e. Umiejętność samodzielnego pisania, utrzymywania i refaktoryzacji testów (np. Jest, Testing Library, Cypress). Biegła obsługa systemu kontroli wersji Git. Dobre rozumienie zasad dostępności (Accessibility / a11y). Umiejętność tworzenia interfejsów zgodnych z WCAG. Doświadczenie z pracą z Jira, Confluence, Bitbucket. Umiejętności mile widziane Doświadczenie w pracy z design systemami, zarówno w ich używaniu, jak i współtworzeniu we współpracy z zespołem projektowym. Doświadczenie w architekturze microfrontendów. Znajomość wyzwań związanych z podziałem aplikacji i integracją. Doświadczenie w pracy z hybrydowymi aplikacjami mobilnymi (np. WebView, React Native). Doświadczenie w pracy z agentami AI lub narzędziami opartymi o AI.

🏢 Summary: Hybrid React Team Lead role focused on leading the development of scalable web applications and managing a frontend team in a dynamic, product-oriented environment. The position combines hands-on React development with architectural decisions, state management design, and close collaboration with cross-functional teams. It requires strong expertise in modern frontend technologies, testing practices, and performance optimization. 🗂️ Requirements: 5+ years experience with JavaScript/TypeScript, 3+ years experience with React.js, Strong knowledge of React Hooks, Strong knowledge of Context API, Strong knowledge of Redux (Redux Toolkit preferred), Experience with frontend design patterns, Experience with clean code principles, Experience with RESTful APIs or GraphQL, Good knowledge of HTML5, Good knowledge of CSS3/SCSS, Experience with responsive design, Experience with component libraries and design systems, Familiarity with Webpack or Vite, Experience leading or mentoring developers 📃 Skills: JavaScript, TypeScript, React, Redux, ReduxToolkit, Hooks, ContextAPI, HTML5, CSS3, SCSS, REST, GraphQL, Webpack, Vite, Jest, ReactTestingLibrary, Storybook, MaterialUI, Tailwind, Next.js, Lighthouse, ChromeDevTools, WCAG 🏢 Description: Please note: This is a hybrid role – 3 days per week from the office in Warsaw. Overview We are a leader in AI-powered enterprise operations. We deliver digital solutions and consulting services that help companies grow and improve their performance. We use advanced technology to simplify processes, increase efficiency, and create new business opportunities, especially in private capital markets. Our ecosystem includes: PaaS (Platform as a Service) – an AI-based platform that improves workflows, provides useful insights, and supports value creation across portfolios. SaaS (Software as a Service) – a cloud platform that offers strong performance, smart tools, and scalable solutions. S&C (Solutions and Consulting Suite) – modular technology solutions that help manage, grow, and improve company performance. With more than 10 years of experience working with fast-growing companies and private equity-backed businesses, we combine strong industry knowledge with technology expertise to create real business value. The Opportunity We are looking for an experienced and motivated React Team Lead to lead the development of modern and scalable web applications. You will manage a team of React developers, support good frontend architecture practices, and make sure we deliver fast and high-quality user interfaces. The ideal candidate has strong experience with React (including Hooks and Context API), Redux, and frontend design patterns. You should feel comfortable working in a dynamic and team-oriented environment. Responsibilities Lead, mentor, and support a team of React developers through code reviews, 1:1 meetings, and practical guidance. Work closely with product managers, designers, and backend engineers to plan and prioritize features. Manage sprint planning, task estimation, and delivery timelines for the frontend team. Design and build complex user interfaces using React, Hooks, and Context API. Develop and maintain scalable state management solutions using Redux Toolkit. Apply modern frontend design patterns (such as container/presenter, compound components, render props, and HOCs). Build reusable component libraries and ensure alignment with the design system. Improve application performance, accessibility, and cross-browser compatibility. Promote best practices in code quality, testing, CI/CD, and documentation. Maintain strong unit and integration test coverage (e.g., with Jest and React Testing Library). Support frontend architecture decisions and evaluate new tools when needed. Requirements 5+ years of experience with JavaScript/TypeScript, including 3+ years with React.js Strong knowledge of React Hooks, Context API, and Redux (Redux Toolkit preferred) Experience with frontend design patterns and clean code principles Experience working with RESTful APIs or GraphQL Good knowledge of HTML5, CSS3/SCSS, and responsive design Experience with component libraries and design systems (e.g., Storybook, Material UI, Tailwind) Familiarity with build tools such as Webpack or Vite Experience leading or mentoring developers Nice to Have Experience with performance tools (e.g., Lighthouse, Chrome DevTools) Experience with SSR/SSG frameworks like Next.js Knowledge of accessibility standards (WCAG) Contributions to open-source frontend projects Why Join Us? We are looking for creative people who solve problems, learn quickly, and enjoy working in an open and diverse environment. We work hard, support each other, and also make time to enjoy what we do.