Senior Full Stack Developer (React/Angular, Node.js) m/k/n

🏢 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 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 extending a HubSpot-based CRM with new frontend, backend, and integration functionalities in a fully remote setup. The position involves building custom modules, managing license and trial features, and ensuring reliable integrations between internal and external systems. The developer will take ownership of data flows, webhooks, and system reliability within a small cross-functional team. 🗂️ Requirements: Minimum 5 years of experience as Fullstack Developer, Strong knowledge of React, Strong knowledge of TypeScript, Solid experience with Node.js, Experience with API development, Hands-on experience with webhooks, Experience with system integrations, Ability to extend existing backend codebases, Experience with AI-assisted coding tools, English C1 level, Polish B2 level 📃 Skills: React, TypeScript, Node.js, APIs, Webhooks, HubSpot, CRM, LMS, Authentication, Integrations, Monitoring, Observability, Claude 🏢 Description: Senior Fullstack Developer (React / Node.js) – Fully Remote Location: Fully remote Working hours: 10:00–18:00 (UK time), no travel required Rate: PLN 120–160 / hour Project duration: Initial 2 months, extension very likely Client: International financial institution Process: 2 interview stages Team: 2 Developers, Project Manager, Architect About the Role We are looking for an experienced Senior Fullstack Developer to join a small, cross-functional team working on the expansion of an existing CRM system. The project focuses on extending a HubSpot-based solution with new frontend, backend, and integration functionalities. You will play a key role in designing and building a new custom HubSpot application for internal users, developing license and trial management features, and integrating multiple internal and external systems. The role combines hands-on development with ownership of integrations and data flow reliability. Responsibilities Design and develop a new custom module within an existing HubSpot application Build user-facing interfaces for internal HubSpot users Implement a management panel for customer trials and licenses Integrate the application with existing internal APIs Identify and implement missing backend functionalities Develop integration code in Node.js connecting LMS webhooks with the authentication system Automate user account creation based on LMS-triggered events Automate user roles and permissions assignment based on learning system data Ensure data consistency, reliability, and observability across systems Handle error management, retries, and monitoring of webhook-based flows Requirements Minimum 5 years of professional experience as a Fullstack Developer Very strong knowledge of React and TypeScript Solid experience with Node.js and API development Hands-on experience with webhooks and system integrations Ability to read, understand, and extend existing backend codebases Practical experience using Claude Code or similar AI-assisted coding tools English proficiency at C1 level (daily collaboration with international clients) Polish proficiency at B2 level or higher (internal team communication) What We Offer Fully remote work Competitive hourly rate: PLN 120–160 Sports card (Multisport or equivalent) Private medical healthcare Access to learning and training platforms Small, experienced team with a clear technical direction High likelihood of project extension after 2 months

🏢 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: Senior Fullstack Developer role focused on designing and developing enterprise-grade systems based on microservices and event-driven architecture using Java and Angular. The position involves fullstack development, architectural decision-making, and building scalable, secure applications in an international environment. The developer will contribute to high-quality code, integrations, and CI/CD processes. 🗂️ Requirements: 9+ years of commercial development experience, Strong knowledge of Java 17–21, Hands-on experience with Spring Boot 3.x, Practical experience with Angular (SPA), Experience with Node.js and TypeScript, Experience with Kafka and event-driven architecture, Strong knowledge of Oracle SQL, Practical experience with Redis, Knowledge of Domain Driven Design (DDD), Experience working with microservices architecture, Experience with OAuth2 and OIDC security, Experience with CI/CD pipelines, Experience in large-scale production systems, English proficiency at B2+/C1 level 📃 Skills: Java, SpringBoot, Angular, Node.js, TypeScript, Kafka, Oracle, SQL, Redis, DDD, OAuth2, OIDC, Microservices, EventDriven, CICD 🏢 Description: Senior Fullstack Developer (Java + Angular) 📍 Warszawa (hybryda 2x w tygodniu) 💰 1100–1400 (B2B) 🧠 Poziom: Senior (9+ lat doświadczenia) O roli Szukamy doświadczonego Senior Fullstack Developera , który będzie współtworzyć i rozwijać nowoczesne systemy klasy enterprise oparte o mikroserwisy i architekturę event-driven. Praca obejmuje zarówno backend, jak i frontend – bez podziału na „jedną stronę stosu”. Będziesz pracować w międzynarodowym środowisku, w ścisłej współpracy z biznesem i zespołami technicznymi, realnie wpływając na architekturę i jakość systemów. Zakres obowiązków Projektowanie i rozwój aplikacji fullstack (backend + frontend) Tworzenie i rozwój mikroserwisów w Java (Spring Boot 3.x) Budowa SPA w Angular Integracje systemów oparte o architekturę event-driven (Kafka) Udział w projektowaniu architektury i decyzjach technicznych Dbanie o jakość kodu, testy i CI/CD Praca nad bezpieczeństwem aplikacji (OAuth2 / OIDC) Optymalizacja i rozwój istniejących systemów Współpraca z zespołami międzynarodowymi (angielski wymagany) Wymagania techniczne Must have: 9+ lat doświadczenia komercyjnego Bardzo dobra znajomość Java 17–21 (nowoczesne podejście, bez legacy) Spring Boot 3.x i mikroserwisy Angular – praktyczne doświadczenie w SPA Node.js + TypeScript Kafka i systemy event-driven Oracle SQL Redis (praktyka lub bardzo dobra znajomość) Domain Driven Design Doświadczenie w pracy w dużych systemach produkcyjnych Bardzo dobry angielski (min. B2+/C1) Dodatkowe atuty: Jenkins / GitLab CI Docker / Kubernetes Maven Python Narzędzia AI wspierające development Znajomość OWASP i praktyk security

🏢 Summary: Senior Fullstack Developer role focused on building and developing enterprise-grade systems based on microservices and event-driven architecture using Java and Angular. The position involves fullstack development (backend and frontend), architectural decision-making, and ensuring code quality, security, and CI/CD processes in an international environment. 🗂️ Requirements: 9+ years of commercial development experience, Strong knowledge of Java 17–21, Experience with Spring Boot 3.x and microservices, Practical experience with Angular and SPA development, Experience with Node.js and TypeScript, Experience with Kafka and event-driven architecture, Strong knowledge of Oracle SQL, Experience with Redis, Knowledge of Domain Driven Design, Experience working with large production systems, English proficiency at B2+/C1 level 📃 Skills: Java, Spring, Angular, Node.js, TypeScript, Kafka, Oracle, SQL, Redis, DDD, OAuth2, OIDC, Jenkins, GitLab, Docker, Kubernetes, Maven, Python, OWASP, CI/CD 🏢 Description: Senior Fullstack Developer (Java + Angular) 📍 Warszawa (hybryda 2x w tygodniu) 💰 1100–1400 (B2B) 🧠 Poziom: Senior (9+ lat doświadczenia) O roli Szukamy doświadczonego Senior Fullstack Developera , który będzie współtworzyć i rozwijać nowoczesne systemy klasy enterprise oparte o mikroserwisy i architekturę event-driven. Praca obejmuje zarówno backend, jak i frontend – bez podziału na „jedną stronę stosu”. Będziesz pracować w międzynarodowym środowisku, w ścisłej współpracy z biznesem i zespołami technicznymi, realnie wpływając na architekturę i jakość systemów. Zakres obowiązków Projektowanie i rozwój aplikacji fullstack (backend + frontend) Tworzenie i rozwój mikroserwisów w Java (Spring Boot 3.x) Budowa SPA w Angular Integracje systemów oparte o architekturę event-driven (Kafka) Udział w projektowaniu architektury i decyzjach technicznych Dbanie o jakość kodu, testy i CI/CD Praca nad bezpieczeństwem aplikacji (OAuth2 / OIDC) Optymalizacja i rozwój istniejących systemów Współpraca z zespołami międzynarodowymi (angielski wymagany) Wymagania techniczne Must have: 9+ lat doświadczenia komercyjnego Bardzo dobra znajomość Java 17–21 (nowoczesne podejście, bez legacy) Spring Boot 3.x i mikroserwisy Angular – praktyczne doświadczenie w SPA Node.js + TypeScript Kafka i systemy event-driven Oracle SQL Redis (praktyka lub bardzo dobra znajomość) Domain Driven Design Doświadczenie w pracy w dużych systemach produkcyjnych Bardzo dobry angielski (min. B2+/C1) Dodatkowe atuty: Jenkins / GitLab CI Docker / Kubernetes Maven Python Narzędzia AI wspierające development Znajomość OWASP i praktyk security

🏢 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: 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 building and maintaining scalable financial-sector applications using .NET and React. The position involves backend and frontend development, API design, automated testing, and collaboration with cross-functional teams in a global engineering environment. 🗂️ Requirements: 6+ years of Full Stack Development experience, Strong knowledge of C#, Strong knowledge of .NET, Strong knowledge of React, Experience with Microsoft SQL Server, Experience with REST APIs, Experience with automated testing, Experience with CI/CD, Experience with Git, Experience with Docker, Understanding of software architecture, Understanding of microservices, Understanding of distributed systems, Strong problem-solving skills, Strong communication skills, Fluent English 📃 Skills: C#, NET, React, SQL, REST, Git, Docker, CI/CD, Microservices 🏢 Description: Senior Full Stack Developer (.NET & React) We are looking for an experienced Senior Full Stack Developer to join a global engineering team building business-critical applications for the financial sector. You will be responsible for designing, developing, and maintaining scalable backend services and modern web applications, working closely with business stakeholders and cross-functional teams. Responsibilities Design, develop, and maintain applications using C#/.NET and React . Build scalable APIs and responsive user interfaces. Collaborate with business and technical teams to deliver high-quality solutions. Write automated tests and contribute to CI/CD and DevOps best practices. Support production systems and drive continuous improvements in performance and reliability. Requirements 6+ years of experience as a Full Stack Developer. Strong expertise in C#/.NET , React , and Microsoft SQL Server . Experience with REST APIs, automated testing, CI/CD, Git, and Docker. Good understanding of software architecture, microservices, and distributed systems. Strong problem-solving and communication skills. Fluent English. Nice to Have Experience in the financial services or trading domain. Experience working in distributed, international teams.

🏢 Summary: Senior Fullstack Developer role focused on building and scaling high-availability microservices-based systems in a large-scale digital transformation program. The position involves developing backend services in Java (Spring Boot) and contributing to Angular frontend, with strong emphasis on performance, integration, and DevOps collaboration. The role includes architectural input and ensuring high code quality within CI/CD environments. 🗂️ Requirements: Min. 5 years of experience with Java, Min. 5 years of experience with Spring, Spring Boot, Spring Cloud, Hibernate, Experience with Liquibase, Experience with Angular, Experience with Apache Kafka, Experience with Git and Maven, Experience in writing unit tests, Knowledge of OOP and Functional Programming, Experience with Docker and Kubernetes, Knowledge of RabbitMQ and ElasticSearch, Ability to scale systems and optimize performance, Knowledge of application performance diagnostics tools 📃 Skills: Java, Spring, SpringBoot, SpringCloud, Hibernate, Liquibase, Angular, TypeScript, Kafka, RabbitMQ, Git, Maven, Docker, Kubernetes, ElasticSearch, OOP, FunctionalProgramming, Microservices, CICD, Sonar, IntelliJ, Jira, Bitbucket, Bamboo 🏢 Description: Dla naszego klienta – jednej z największych instytucji finansowo-ubezpieczeniowych w Europie Środkowo-Wschodniej, realizującej zaawansowane projekty cyfrowe i technologiczne na dużą skalę – poszukujemy doświadczonego Senior Fullstack Developera . Firma przechodzi intensywną transformację cyfrową, rozwijając nowoczesne systemy o wysokiej dostępności i wydajności. Stack technologiczny Back-end: Java, Spring, Spring Boot, Hibernate, Liquibase, Kafka Front-end: Angular, TypeScript DevOps & środowisko: Docker, Kubernetes Narzędzia: IntelliJ, Jira, Bitbucket, Bamboo, Sonar, CI/CD Zakres obowiązków Projektowanie i rozwój nowoczesnych aplikacji w architekturze mikroserwisowej Tworzenie oraz rozwój warstwy backendowej w Javie (Spring Boot) Współtworzenie i rozwój frontendu w Angularze Integracja systemów z wykorzystaniem Kafki oraz RabbitMQ Optymalizacja wydajności oraz skalowanie aplikacji Udział w projektowaniu rozwiązań architektonicznych Współpraca z zespołem DevOps w zakresie CI/CD oraz wdrożeń Dbanie o jakość kodu (testy jednostkowe, code review, Sonar) Wymagania (Must Have) Bardzo dobra znajomość Java (min. 5 lat) Bardzo dobra znajomość Spring / Hibernate, Spring Boot, Spring Cloud (min. 5 lat) Dobra znajomość Liquibase Doświadczenie w pracy z Angular Doświadczenie z Apache Kafka Znajomość Git, Maven Doświadczenie w pisaniu testów jednostkowych Znajomość paradygmatów OOP oraz Functional Programming Doświadczenie z Docker, Kubernetes Znajomość RabbitMQ, ElasticSearch Umiejętność skalowania systemów oraz optymalizacji wydajności Znajomość narzędzi do diagnostyki wydajności aplikacji Oferujemy Umowa B2B oraz stabilna, długoterminowa współpraca Prywatna opieka medyczna Luxmed Karta sportowa Multisport Praca hybrydowa (1 x w tygodniu przyjazd do biura w Warszawie) Proces rekrutacyjny: Rozmowa HR - 20 min Spotkanie z klientem - 1 h