Fullstack Developer (Node.js + React)

🏢 Summary: Full-time Senior Full Stack Developer role focused on building scalable, data-driven platforms for financial and enterprise sectors using Node.js and React. The position involves designing microservices, developing RESTful APIs, and creating responsive front-end applications in a hybrid work model (Warsaw). 🗂️ Requirements: 5+ years experience as Senior Full Stack Developer, Strong expertise in Node.js, Strong expertise in React, Experience with Express.js, Experience building RESTful or GraphQL APIs, Knowledge of OAuth and JWT authentication, Proficiency in Redux, HTML5, CSS3, ES6+, Experience with Vite, Webpack or Babel, Experience with MySQL or PostgreSQL, Experience with AWS, Azure or GCP, Experience with Docker and Kubernetes, Proficiency with Git 📃 Skills: Node.js, React, Express.js, GraphQL, REST, OAuth, JWT, Redux, HTML5, CSS3, JavaScript, ES6, Vite, Webpack, Babel, MySQL, PostgreSQL, AWS, Azure, GCP, Docker, Kubernetes, Git, SQL, MongoDB, CI/CD 🏢 Description: Senior Full Stack Developer (Node.js + React) 💰 Salary: 23,000-24,800 PLN/Month 💻 Warsaw, Poland (Hybrid - 3 days in office, 2 days remote) 🕦 Full-time ☑️ B2B or CoE We’re looking for a Senior Full-Stack Developer to join a fast-growing international tech company focused on building modern, data-driven platforms that power digital transformation in the financial and enterprise sectors. Requirements: 5+ years of experience as a Senior Full Stack Developer with significant expertise in Node.js and React. Strong experience in building server-side applications using Node.js and Express.js. Hands-on experience with API development and integration, particularly with GraphQL or RESTful services. Strong knowledge of authentication and authorization mechanisms (OAuth, JWT, session-based). Front-end proficiency in React.js, Redux, HTML5, CSS3, and modern JavaScript (ES6+). Familiarity with front-end build tools such as Vite, Webpack, and Babel. Strong experience with databases such as MySQL and  PostgreSQL. Experience with cloud platforms (AWS, Azure, or GCP), as well as containerization and orchestration tools such as Docker and Kubernetes. Strong experience using Git and version control systems. Proficiency in English (both written and spoken). Key Responsibilities: Design, build, and maintain scalable, high-performance server-side applications and RESTful APIs using Node.js and Express.js. Develop and maintain interactive, responsive user interfaces using React.js, Redux, and modern JavaScript (ES6+). Lead the design and implementation of scalable architectures and microservices. Work closely with database engineers to design efficient schemas and manage data interactions using SQL databases or MongoDB. Ensure reliable deployments and smooth release of updates using CI/CD pipelines and Docker. Write unit and integration tests and optimize performance to ensure high-quality code. Collaborate closely with cross-functional teams to define and implement technical solutions. Improve system performance, reliability, and long-term maintainability through optimization and best practices. Get to know DevsData: We are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in international corporations as well as students of the best technical and business universities. Find out more: https://devsdata.com/

🏢 Summary: Senior Full Stack Developer role focused on architecting and delivering high-performance web applications using React and Node.js. The position involves leading system design, building scalable front-end and back-end solutions, and overseeing cloud-based deployments and DevOps processes. The role includes technical ownership of microservices, APIs, databases, and application performance in a hybrid Warsaw-based setup. 🗂️ Requirements: 7+ years full stack development experience, 2+ years in senior or technical lead role, Expert-level React.js with Hooks and Redux, Advanced JavaScript ES6+ proficiency, Strong Node.js and Express.js experience, Experience designing REST or GraphQL APIs, Experience with OAuth, JWT, sessions, RBAC, Database design and optimization with PostgreSQL, MySQL, or MongoDB, Hands-on Docker experience, Experience with AWS, Azure, or GCP, CI/CD pipeline management experience, Proficiency with Git workflows, Bachelor’s or Master’s in Computer Science or related field 📃 Skills: React, Redux, JavaScript, HTML5, CSS3, Node.js, Express, GraphQL, REST, OAuth, JWT, RBAC, PostgreSQL, MySQL, MongoDB, Docker, Kubernetes, AWS, Azure, GCP, Git, CI/CD, Webpack, Babel, Vite 🏢 Description: 🧩 About the Company Our client is a rapidly growing US-based technology firm with global operations. With a strong commitment to innovation and quality engineering, the company is building a new engineering hub in Warsaw. This is your opportunity to join a high-performing team and play a pivotal role in developing next-generation digital solutions for the private capital markets. 📍 Location & Setup Start remotely and transition to a hybrid model based in Warsaw (3 days/week in the office in the coming months). 🧠 The Role: Senior Full Stack Developer (React & Node.js) We’re looking for an expert-level Senior Full Stack Developer with at least 7 years of professional experience in designing, architecting, and delivering high-performance web applications. You will take ownership of complex technical challenges across both the front-end and back-end, drive architectural decisions, and provide technical leadership and mentorship within the software development lifecycle. 🔧 Key Responsibilities Technical Leadership: Architect and develop scalable, responsive UIs with React.js, Redux, and modern JavaScript (ES6+). System Design: Design, build, and scale advanced server-side applications, microservices architecture, and RESTful/GraphQL APIs with Node.js and Express. Data Architecture: Lead database design, optimization, and integration strategies (PostgreSQL, MySQL, or MongoDB). Quality Assurance: Define testing strategies, write robust unit/integration tests, and establish efficient debugging protocols for the team. DevOps & Deployment: Oversee and optimize CI/CD pipelines, containerization using Docker, and cloud deployments. Agile Mentorship: Lead agile collaboration with product managers, designers, and engineers, while mentoring mid-level and junior developers. Performance: Proactively monitor system performance, identify bottlenecks, and maintain high-availability production-grade applications. Standards: Establish and maintain comprehensive technical documentation and coding standards. 📌 What We’re Looking For Front-End: Expert-level experience with React.js, Hooks, Redux, and complex component-based architecture. Deep mastery of HTML5, CSS3, and ES6+. Advanced configuration and optimization experience with build tools like Webpack, Babel, or Vite. Back-End: Senior-level proficiency in Node.js & Express.js for enterprise applications. Extensive API design and architecture experience (GraphQL highly preferred, alongside REST). Deep understanding and implementation experience with advanced security and authentication protocols: OAuth, JWT, sessions, and RBAC. Databases & DevOps: Proven experience in scaling and optimizing relational and non-relational databases (PostgreSQL, MySQL, or MongoDB). Solid hands-on experience with Docker; Kubernetes experience is highly advantageous. Demonstrated experience designing and deploying applications on cloud platforms (AWS, Azure, or GCP). Advanced proficiency with Git workflows and driving Agile/Scrum methodologies. 🎓 Qualifications Bachelor’s or Master’s in Computer Science or a related field. 7+ years of hands-on experience in full stack development. 2+ years of experience in a senior or technical lead capacity. Proven track record of architecting, deploying, and maintaining high-traffic production applications. 💡 Soft Skills Strategic, analytical thinker and highly effective problem-solver. Strong technical leadership, team collaboration, and cross-functional communication skills. Self-motivated with excellent time management and the ability to drive projects autonomously. Passion for continuous learning, adopting new technologies, and sharing knowledge with the team. 🎁 What’s Offered Competitive salary up to $6,200 USD/month. Hybrid remote role with 3 days form office in the heart of Warsaw Generous Paid Time Off (PTO). Comprehensive full benefits package. The unique chance to shape the technical foundation of a new engineering hub and lead high-impact projects. A supportive, innovation-driven work environment that values technical excellence.

🏢 Summary: Senior Fullstack Engineer role focused on building modern, scalable web applications using React and Node.js, with strong emphasis on frontend development. The position covers the full application stack, including backend services, API design, and data management. You will collaborate with cross-functional teams to deliver high-quality, accessible, and high-performance digital products. 🗂️ Requirements: Strong commercial experience with React, Strong commercial experience with Node.js, Experience with React Router, Experience with TanStack Query, Experience integrating Headless CMS (preferably Contentful), Understanding of API design principles, Experience with PostgreSQL, Experience with Redis, Experience with Vitest, Experience with Playwright, Knowledge of WCAG accessibility standards, Experience with performance optimisation, Ability to work across full software development lifecycle 📃 Skills: React, Node.js, TypeScript, Fastify, PostgreSQL, Redis, React Router, TanStack Query, Contentful, Vitest, Playwright, WCAG, SAP Gigya, Salesforce 🏢 Description: Senior Fullstack Engineer (React & Node.js) About the Role We are looking for a Senior Fullstack Engineer to join a product team building modern, scalable web applications and digital experiences. You will work across the entire application stack, from user-facing interfaces to backend services and integrations. The role has a strong focus on frontend engineering while also involving backend development, API design, and data management. You will collaborate closely with product, design, and engineering teams to deliver high-quality, accessible, and performant applications. Responsibilities Develop and maintain modern web applications using React, Node.js, and TypeScript. Build scalable and reusable UI components integrated with a design system. Develop and maintain backend services and APIs using Node.js and Fastify. Integrate applications with CMS platforms and third-party services. Work with PostgreSQL and Redis to support application functionality and performance. Write and maintain automated tests, including unit and end-to-end tests. Ensure high standards of accessibility, performance, and code quality. Participate in architectural discussions and contribute to engineering best practices. Requirements Strong commercial experience in fullstack development using React and Node.js. Solid experience with modern frontend technologies, including React Router and TanStack Query. Experience integrating with Headless CMS platforms, preferably Contentful. Good understanding of API design and backend development principles. Experience with PostgreSQL and Redis. Experience with automated testing frameworks such as Vitest and Playwright. Strong understanding of accessibility standards (WCAG) and performance optimisation. Ability to work across the entire software development lifecycle in a product-oriented environment. Nice to Have Experience with authentication and identity platforms such as SAP Gigya. Experience integrating Salesforce products or loyalty platforms. Experience in highly scalable, customer-facing digital products. Experience working in agile, cross-functional product teams.

🏢 Summary: Senior Fullstack (React + Node.js) Developer role focused on building and enhancing a complex iGaming platform using modern web technologies. The position involves developing new features, integrating third-party APIs, and ensuring scalability, performance, and code quality within a microservices-based architecture. Office presence in Łódź or Wrocław is required. 🗂️ Requirements: Knowledge of JavaScript and ECMAScript 6, 3+ years commercial experience with React, 3+ years commercial experience with Node.js, 3+ years commercial experience with Nest.js, 5+ years commercial experience in web development, Experience with high-load SQL or NoSQL databases, Experience implementing REST, GraphQL and WebSockets, Understanding of TDD principles and writing tests, Understanding of microservices architecture, Experience with GIT, Experience with RabbitMQ, Experience with Redis, Ability to work from office in Łódź or Wrocław 5 days per week 📃 Skills: JavaScript, ECMAScript6, React, Node.js, Nest.js, SQL, NoSQL, REST, GraphQL, WebSockets, TDD, Microservices, GIT, RabbitMQ, Redis 🏢 Description: We are looking for a Senior Fullstack (React + Node.js) Developer to join our team in developing a complex iGaming platform using the latest web development technologies. If you're a self-starter with solid architecture, design, coding, testing, and debugging skills, we'd love to hear from you! Please note that office work 5 days from the EPAM office in Łódź, Wroclaw is required. Responsibilities Develop the in-house iGaming platform Integrate 3rd party APIs Create new features from inception Collaborate with cross-functional teams for high-quality solutions Ensure platform scalability and performance Maintain code quality through testing and debugging Contribute to architectural and design decisions Enhance and support existing platform components Requirements Knowledge of JavaScript and ECMAScript 6 standards 3+ years commercial experience in React, Node.js and Nest.js 5+ years commercial experience in web development Background in high loaded SQL or NoSQL databases Implementation of REST, GraphQL and WebSockets Understanding of TDD principles and test writing Familiarity with microservice architecture principles Skills in GIT, RabbitMQ and Redis Nice to have 2+ years hands-on background developing over CI/CD, Microservices architecture or Containers Familiarity with Kubernetes, Nats or TypeScript We offer/Benefits We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

🏢 Summary: Senior Full Stack Developer role focused on building and maintaining a complex web application for visualization of financial relationship networks using React, Node.js, GraphQL, and graph databases. The position involves end-to-end development, backend integration, graph data visualization, and architectural decision-making in a fully remote B2B setup. Candidates will work with scalable microservices, streaming systems, and advanced frontend performance optimization. 🗂️ Requirements: Minimum 7 years of commercial software development experience, Expert knowledge of React, Advanced TypeScript skills, Strong experience with Redux, Experience optimizing frontend performance for large datasets, Solid Node.js backend development experience, Experience building REST APIs, Experience building GraphQL APIs, Knowledge of application architecture and design patterns, Experience with Storybook, English level B2/C1, Ability to make technical decisions independently 📃 Skills: React, Node.js, TypeScript, Redux, GraphQL, REST, Storybook, MongoDB, Neo4j, Kafka, D3.js, GoJS, Cytoscape, AGGrid, Cypher, Gremlin, Neptune 🏢 Description: Senior Full Stack Developer (React / Node.js / Graph Data) Stawka: 190 – 200 PLN / godz. netto (+ VAT) Forma współpracy: Kontrakt B2B Model pracy: 100% Zdalnie (w ramach zespołu w Polsce) Godziny pracy: 9:00 – 17:00 (Warsaw Time) O projekcie Dołączasz do nowo powstającego, zespołu projektowego w Polsce, który przejmuje całkowitą odpowiedzialność za end-to-end rozwój zaawansowanej aplikacji webowej opartej na technologii baz grafowych. Przenosimy "serce" systemu do Polski. Aplikacja służy do wizualizacji złożonych sieci powiązań finansowych . Szukamy mocnego zawodnika – Seniora z krwi i kości, który bez problemu połączy skomplikowany świat danych backendowych z najwyższej klasy interfejsem użytkownika. Twój profil: Silny Full Stack (Mocny React + Solidny Node.js) W tej roli łączysz dwa światy. Z jednej strony potrzebujemy Twojej eksperckiej wiedzy w React , aby płynnie renderować ogromne ilości danych i sieci powiązań grafowych. Z drugiej strony Twój kod w Node.js będzie stanowił "serce" komunikacji między API GraphQL a rozbudowanym ekosystemem danych (Kafka, MongoDB, Neo4j). Twoje zadania: React Excellence: Projektowanie i rozwój zaawansowanych, wydajnych aplikacji webowych przy użyciu React i TypeScript. Wizualizacja Danych Grafowych: Transformacja surowych danych z bazy grafowej na interaktywne, responsywne komponenty UI (z użyciem D3.js, GoJS lub pokrewnych). Rozwój Core Backend: Projektowanie, utrzymanie i optymalizacja skalowalnych mikroserwisów w Node.js (TypeScript). Ewolucja GraphQL & Integracja: Projektowanie optymalnych schematów i wydajnych resolverów, które spajają frontend z bazami NoSQL/Neo4j oraz systemami streamingowymi (Kafka). Quality & Architecture Leadership: Aktywny udział w podejmowaniu decyzji architektonicznych, dbanie o czystość kodu (rygorystyczne Code Review) oraz rozwój reużywalnych komponentów w Storybook. Wymagania (Must Have) – Szukamy Eksperta: Minimum 7 lat komercyjnego doświadczenia w rozwoju oprogramowania. Expert React & TypeScript: Głęboka znajomość nowoczesnych wzorców React, zaawansowanego zarządzania stanem ( Redux ) oraz optymalizacji wydajności frontendowej przy renderowaniu dużych, zagnieżdżonych zestawów danych. Solidny Node.js & TypeScript: Praktyczne doświadczenie w budowaniu stabilnych, produkcyjnych systemów backendowych i wydajnych API (REST / GraphQL ). Architektura & Narzędzia: Bardzo dobra znajomość architektury aplikacji, wzorców projektowych oraz praca ze Storybook . Język angielski: Minimum B2/C1 – warunek konieczny do codziennej, płynnej współpracy z interesariuszami z USA i Holandii. Zdolność do brania odpowiedzialności: Szukamy osoby z samodzielnym podejściem, która potrafi podjąć decyzję techniczną i dba o stabilność całego systemu. Mile widziane (Mile widziane): Praktyczna znajomość baz NoSQL oraz baz grafowych (np. MongoDB, Neo4j , AWS Neptune) wraz z zapytaniami Cypher/Gremlin. Doświadczenie z systemami event-driven / streamingowymi (np. Apache Kafka ). Zaawansowana znajomość AG Grid pod kątem rozbudowanego raportowania. Doświadczenie z bibliotekami do wizualizacji danych (D3.js, GoJS, Cytoscape). Co oferujemy? Realny wpływ: Nie jesteś tylko wykonawcą zadań. Jako Senior masz decydujący głos w kwestiach architektonicznych i technologicznych. Unikalny Stack Technologiczny Stabilność i profesjonalizm plus praca zdalna Zainteresowany? Aplikuj

🏢 Summary: Senior Fullstack Developer role focused on building and scaling a complex iGaming platform using React and Node.js. The position involves developing new features, integrating third-party APIs, and contributing to architectural decisions within a microservices-based environment. The role requires strong experience in high-load systems and modern web technologies. 🗂️ Requirements: 5+ years commercial experience in web development, 3+ years commercial experience with React, 3+ years commercial experience with Node.js, 3+ years commercial experience with Nest.js, Strong knowledge of JavaScript and ECMAScript6, Experience with high-load SQL or NoSQL databases, Experience implementing REST, GraphQL and WebSockets, Understanding of TDD and test writing, Knowledge of microservices architecture, Experience with Git, Experience with RabbitMQ, Experience with Redis 📃 Skills: JavaScript, ECMAScript6, React, Node.js, Nest.js, SQL, NoSQL, REST, GraphQL, WebSockets, TDD, Git, RabbitMQ, Redis, Microservices 🏢 Description: We are looking for a Senior Fullstack (React + Node.js) Developer to join our team in developing a complex iGaming platform using the latest web development technologies. If you're a self-starter with solid architecture, design, coding, testing, and debugging skills, we'd love to hear from you! Please note that office work 5 days from the EPAM office in Krakow, Gdansk, Wroclaw, Katowice or Poznan is required. Responsibilities Develop the in-house iGaming platform Integrate 3rd party APIs Create new features from inception Collaborate with cross-functional teams for high-quality solutions Ensure platform scalability and performance Maintain code quality through testing and debugging Contribute to architectural and design decisions Enhance and support existing platform components Requirements Knowledge of JavaScript and ECMAScript 6 standards 3+ years commercial experience in React, Node.js and Nest.js 5+ years commercial experience in web development Background in high loaded SQL or NoSQL databases Implementation of REST, GraphQL and WebSockets Understanding of TDD principles and test writing Familiarity with microservice architecture principles Skills in GIT, RabbitMQ and Redis Nice to have 2+ years hands-on background developing over CI/CD, Microservices architecture or Containers Familiarity with Kubernetes, Nats or TypeScript We offer/Benefits We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

🏢 Summary: Senior Full Stack Developer role for an international product team focused on building scalable applications using TypeScript, React, Node.js, PostgreSQL, and Kafka. The contract is remote, B2B, initially for 6 months with possible extension, and includes collaboration in an agile international environment with AI-powered development tools. 🗂️ Requirements: 8+ years of commercial software development experience, Strong TypeScript experience, Experience with React, Experience with Node.js, Experience with NestJS, Knowledge of PostgreSQL, Knowledge of REST APIs, Knowledge of Kafka, Experience building scalable systems, Daily use of AI coding tools, English level B2+/C1 📃 Skills: TypeScript, React, Node.js, NestJS, PostgreSQL, REST, Kafka, Claude, Cursor, Codex, Copilot 🏢 Description: co.brick talents — powered by AI, powered by people. Senior Full Stack Developer (TypeScript / React / Node.js) Location: Remote Contract: B2B Rate: Up to 150–160 PLN/hour Duration: 6 months with a strong possibility of extension Start: ASAP About the project We are looking for an experienced Senior Full Stack Developer to join an international product development team. You will work on building and enhancing scalable software solutions in a modern technology stack, collaborating with experienced engineers in an agile environment. Your responsibilities Design, develop, and maintain scalable full stack applications. Build high-quality backend services and modern frontend solutions. Develop and integrate REST APIs. Work with PostgreSQL and Kafka-based architectures. Collaborate with cross-functional, international teams. Apply AI-powered coding tools to improve development efficiency and code quality. Requirements 8+ years of commercial software development experience. Strong experience with TypeScript on both the frontend and backend. Hands-on experience with React and Node.js/NestJS . Solid knowledge of PostgreSQL , REST APIs , and Kafka . Experience designing and building scalable systems or software products. Daily use of AI coding tools such as Claude Code, Cursor, Codex, GitHub Copilot , or similar ( must have ). Very good English communication skills ( B2+/C1 , must have ). Nice to have Experience building SaaS products. Experience developing on-premise software solutions. Recruitment process The recruitment process includes a technical assignment (approximately 5 hours) . During the task, you are welcome and encouraged to use AI coding tools , as we value modern software development practices.

🏢 Summary: Senior .NET Fullstack Developer role focused on building scalable applications with React front-end and .NET backend while driving DevOps transformation and CI/CD optimization. The position combines full-stack development, architecture design, and automation within a data-driven DevOps environment. Hybrid work model with strong emphasis on engineering excellence and lifecycle management. 🗂️ Requirements: Minimum 7 years of experience in .NET production development, Strong proficiency in C# and Web API, Hands-on experience with React, Experience with SQL Server and T-SQL, Experience in CI/CD and DevOps automation, Knowledge of SDLC, Fluent English, Legal right to work in the EU 📃 Skills: .NET, C#, WebAPI, React, SQLServer, T-SQL, CI/CD, DevOps, Azure, Cloud, Docker, Kubernetes 🏢 Description: Unleash innovative solutions — shape the future of DevOps and full-stack excellence! Krakow-based opportunity with hybrid work model (up to 3 remote days per week). As a Senior .NET Fullstack Developer — React & DevOps Expertise , you will be working for our client, a leader in banking innovation, providing critical analytics and metrics that empower strategic transformation across engineering teams worldwide. Join a trailblazing team driving DevOps transformation through cutting-edge data, analytics, and practices—be a key driver of impactful change and technological evolution. Your main responsibilities: Implement solutions following best design patterns to ensure scalable and maintainable applications. Analyze requirements thoroughly and recommend improvements for optimal performance. Lead UI enhancements to elevate user experience and application stability. Actively participate in DevOps automation and optimize the CI/CD lifecycle. Contribute to software architecture design and develop application prototypes to validate concepts. Provide exceptional customer support by promptly addressing and resolving issues. Collaborate effectively with stakeholders to understand needs and deliver tailored solutions. You're ideal for this role if you have: Minimum of 7 years of professional experience in production application development within the .NET ecosystem, including React front-end development. Strong proficiency in C# and Web API development, with a focus on scalable and secure backend services. Hands-on experience with React, creating dynamic, interactive web applications. Expertise in database design, SQL Server, T-SQL scripting, and query optimization. Experience in DevOps activities like CI/CD, automation, and lifecycle management. Familiarity with the full Software Development Life Cycle (SDLC). Excellent problem-solving skills with high attention to detail under pressure. It is a strong plus if you have: Certifications in Azure, DevOps, or related fields. Experience with cloud platforms and containerization tools. Language Required for the role: Fluent 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 Full Stack Developer role focused on building high-performance, data-driven web applications with a strong emphasis on React and complex graph visualizations. The position involves developing scalable Node.js APIs and transforming large-scale graph data into interactive UI components. Fully remote B2B contract within a Poland-based team working standard business hours. 🗂️ Requirements: 7+ years of software development experience, Expert knowledge of React and TypeScript, Strong experience with Node.js and TypeScript for server-side development, Experience building REST and GraphQL APIs, Extensive experience with Redux state management, Proficiency with Storybook for component-driven development, Ability to optimize frontend performance for large-scale datasets, High proficiency in English (B2/C1) 📃 Skills: React, TypeScript, Node.js, Redux, GraphQL, REST, D3.js, GoJS, Cytoscape, Neo4j, Cypher, AGGrid, Storybook, Microservices 🏢 Description: Senior Full Stack Developer (React / Node.js ) The Role As a Full Stack Developer with a strong emphasis on React , you will be responsible for crafting the visual and interactive elements of applications that visualize complex financial and ownership networks. While the backend is built on Node.js , your primary challenge will be turning intricate graph data into seamless, high-performance UI components. Key Responsibilities React Excellence: Lead the development of complex, data-driven web applications using React and TypeScript . Graph Visualization: Transform raw graph data into interactive, responsive UIs using D3.js, GoJS , or similar libraries. Backend Services: Develop and maintain scalable APIs and microservices using Node.js and TypeScript . Data Integration: Work closely with graph engineers to integrate real-time GraphQL data and high-end AG Grid reports. Performance: Optimize the frontend to handle and render large-scale, nested datasets without lag. Architecture: Maintain reusable components in Storybook and ensure a consistent, scalable codebase. Technical Requirements (Must Have) 7+ years of experience in software development. Expert React & TypeScript: Deep knowledge of modern React patterns and performance tuning. Node.js & TypeScript: Solid experience in building server-side applications and REST/GraphQL APIs. State Management: Extensive experience with Redux . Modern Tooling: Proficiency with Storybook for component-driven development. English: High proficiency ( B2/C1 ) for daily collaboration with US and Netherlands-based stakeholders. Nice to Have Data Viz: Experience with D3.js, GoJS , or Cytoscape . Graph Databases: Familiarity with Neo4j, or Cypher Reporting: Advanced knowledge of AG Grid . Assignment Details Contract Type: B2B Work Model: 100% Remote / Work from Home Business Hours: 9:00 – 17:00 (Warsaw Time) Location: Poland-based delivery team

🏢 Summary: Long-term B2B offer for a Mid/Senior Fullstack Developer to build and maintain backend services in .NET and frontend applications in React or Angular. The role involves designing REST APIs, working with microservices architecture, and contributing to system architecture and automated testing in an agile environment. Work is available remotely or hybrid with ASAP start. 🗂️ Requirements: 3–8 years commercial experience in .NET or Fullstack development, Strong knowledge of C# and .NET / .NET Core, Experience with ASP.NET Core (Web API, MVC), Practical experience with React or Angular, Experience building SPA applications, Knowledge of MS SQL Server and/or NoSQL databases, Experience with microservices architecture, Knowledge of SOLID, DDD, CQRS patterns, Experience with CI/CD tools, Practical experience with Docker, Experience with unit and integration testing frameworks, Proficiency with Git, English level B2 or higher 📃 Skills: C#, .NET, .NETCore, ASP.NET, React, Angular, SQL, MongoDB, Redis, Docker, Kubernetes, Azure, AWS, xUnit, NUnit, MSTest, Git, CI/CD, AzureDevOps, GitLab, DDD, CQRS, SOLID, Scrum, Kanban 🏢 Description: Mid/Senior Fullstack Developer (.NET + React lub Angular) Lokalizacja: 100% zdalnie / hybrydowo / stacjonarnie (do ustalenia) Forma współpracy: B2B Wynagrodzenie (B2B): Mid do 130 zł/h netto + VAT | Senior do 160 zł/h netto + VAT Start: ASAP / do uzgodnienia Czas trwania projektu: długofalowa współpraca 🏢 O nas RITS Group to firma informatyczna świadcząca najwyższej jakości usługi programistyczne dla klientów z rynku polskiego i międzynarodowego. Realizujemy projekty technologiczne m.in . dla branż finansowej, medycznej i przemysłowej. Stawiamy na jakość, innowacyjność oraz partnerską współpracę. Nasza kultura organizacyjna opiera się na zaufaniu, transparentności i ciągłym rozwoju. Obecnie poszukujemy Senior Fullstack Developera , który dołączy do jednego z kluczowych projektów technologicznych i będzie rozwijał zarówno warstwę backendową, jak i frontendową aplikacji. 💼 Twoje zadania Rozwój aplikacji backendowych w technologii .NET (.NET 6/7/8) Projektowanie i implementacja RESTful API Rozwój aplikacji frontendowych w React lub Angular Integracja warstwy frontendowej z backendem Tworzenie i utrzymywanie warstwy dostępu do danych (Entity Framework / EF Core) Współpraca z innymi developerami, DevOpsami i analitykami Udział w projektowaniu architektury systemu (mikroserwisy, DDD, CQRS) Pisanie testów jednostkowych i integracyjnych, code review Praca w metodykach zwinnych (Scrum / Kanban) ✅ Wymagania Min. 3–8 lat doświadczenia komercyjnego jako programista (.NET / Fullstack) Bardzo dobra znajomość C# oraz platformy .NET / .NET Core Doświadczenie w ASP.NET Core (Web API, MVC) Praktyczna znajomość React lub Angular (wystarczy jeden z tych frameworków) Doświadczenie w pracy z aplikacjami SPA Dobra znajomość baz danych MS SQL Server i/lub NoSQL (MongoDB, Redis) Doświadczenie z mikroserwisami oraz wzorcami projektowymi ( SOLID, DDD, CQRS ) Znajomość narzędzi CI/CD (np. Azure DevOps, GitLab CI) Praktyczna znajomość Docker (mile widziane: Kubernetes, Azure lub AWS) Doświadczenie w testowaniu (xUnit / NUnit / MSTest, mockowanie) Znajomość Git, Jira, Confluence Język angielski na poziomie min. B2 ➕ Mile widziane Doświadczenie z Blazor, MAUI lub SignalR Znajomość RxJS, Redux / NgRx Wiedza z zakresu bezpieczeństwa aplikacji webowych Doświadczenie z systemami kolejkowymi ( Kafka, RabbitMQ ) Znajomość architektury zdarzeniowej Optymalizacja wydajności i profilowanie aplikacji Doświadczenie w pracy w środowiskach chmurowych Nie zwlekaj i zaaplikuj już teraz! Ta rola nie dla Ciebie, ale masz znajomego, który by się sprawdził? Poleć go i zgarnij nawet 5000 zł. Referral Program: Talent from your network