May 30, 2026
Full Stack Engineer
Senior • Hybrid
Warsaw, Poland
Rakuten Viber is one of the most popular and downloaded apps in the world. Working with us provides a unique opportunity to influence hundreds of millions of our users and to be part of the journey that makes us a super-app. Our mission is to make people’s lives easier by enabling meaningful connections, from precious moments with family and friends, through managing business relationships to pursuing their passions.
We are a global team of engineers dedicated to creating the best tools to ensure safe, convenient, and fun communication for millions of users worldwide. Our culture is built on innovation, teamwork, and a commitment to excellence. We offer a unique opportunity to work with cutting-edge technologies, including microservices architecture, and influence the lives of millions of people.
As a Fullstack Developer at Viber, you will be involved in developing and maintaining high-traffic with over 1 billion messages a day and dozens of scalable services, ensuring the fast and reliable operation of our platform. Your tasks will include developing new features, optimizing performance, ensuring data security, and solving complex technical challenges within our microservices architecture, using a combination of Node.js and Java.
Responsibilities
Planning, designing, developing and maintaining high-availability applications that can be high-volume and low-latency.
Define application objectives and functionality.
Ensure application designs conform with business goals.
Support continuous improvement, investigating alternatives and technologies, and presenting for architectural review.
Work in a highly motivated team, closely with Product and Architects teams on large mission-critical systems.
Debug, optimize, and performance-tune your work across the stack.
Requirements
A minimum of 7 years of experience as a Full Stack Developer, with at least 4 years specializing in Node.js
Solid proficiency in JavaScript and TypeScript, with demonstrated experience using TypeScript-first frameworks (such as NestJS, Fastify, or Next.js).
Prior experience with Java.
Proven expertise in developing and scaling enterprise-level production systems within a microservices architecture.
Practical knowledge of at least one major frontend framework, such as React or Angular.
Familiarity with both relational and NoSQL database systems.
Proven experience with REST API design and integration, including the implementation of effective caching strategies.
Hands-on experience with Continuous Integration/Continuous Delivery (CI/CD) pipelines and containerization using Docker.
Experience in developing and executing comprehensive unit and integration tests.
Practical experience working with Agile methodologies in a fast-paced environment.
Strong analytical skills and effective communication abilities, with fluency in written and spoken English.
Advantages
Comprehensive understanding of message queues and event-driven architecture.
Familiarity with essential AWS services, such as SQS, Lambda, and RDS.
Proficiency in utilizing validation libraries like Zod or Yup.
Experience with data-fetching libraries such as React Query or RTK Query.
Experience collaborating within distributed, cross-functional team environments.
A Bachelor of Science degree in Computer Science or a relevant equivalent qualification.
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Warsaw, Poland
110 - 130 PLN
🏢 Summary: Mid/Senior Fullstack Developer role focused on designing and developing modern web applications across the entire technology stack. The position involves full software lifecycle participation, including architecture design, backend and frontend development, database modeling, API integrations, testing, and CI/CD processes. The developer will build new solutions and enhance existing systems with strong emphasis on quality, performance, and automation. 🗂️ Requirements: Minimum 2 years of web application development experience, Experience delivering at least 3 projects end-to-end, RWD development using Bootstrap 4 and BEM, Very good knowledge of HTML5, CSS3, SASS, SCSS, JavaScript, Experience with React or Angular or Vue or Redux, Experience with REST API integration, Experience with Python frameworks: Django or Flask or FastAPI, Experience with SQL and NoSQL databases, Experience with Docker or Podman, Experience with CI/CD pipelines, Experience writing tests using unittest or pytest, Experience with Git version control 📃 Skills: HTML5, CSS3, SASS, SCSS, JavaScript, React, Angular, Vue, Redux, Python, Django, Flask, FastAPI, SQL, NoSQL, REST, Docker, Podman, CI/CD, unittest, pytest, Git, Bootstrap, BEM, RWD 🏢 Description: Szukasz projektu, w którym będziesz mieć realny wpływ na rozwój nowoczesnych aplikacji webowych, uczestniczyć w projektowaniu architektury oraz pracować nad rozwiązaniami obejmującymi cały stack technologiczny? Dla naszego klienta poszukujemy Mid/Senior Fullstack Developera, który wesprze zespół w tworzeniu nowych aplikacji webowych oraz rozwoju istniejących rozwiązań. Osoba na tym stanowisku będzie uczestniczyć w pełnym cyklu wytwarzania oprogramowania – od analizy wymagań biznesowych, przez projektowanie i implementację, aż po wdrożenie i utrzymanie systemów. Twój zakres obowiązków: Projektowanie i rozwój aplikacji webowych: Tworzenie oraz rozwijanie nowoczesnych aplikacji webowych w oparciu o technologie frontendowe i backendowe, z uwzględnieniem wymagań biznesowych, wydajnościowych oraz jakościowych. Współpraca przy analizie i planowaniu rozwiązań: Ścisła współpraca z Product Ownerem, analitykami oraz interesariuszami biznesowymi w zakresie zbierania wymagań, planowania prac, estymacji zadań i proponowania optymalnych rozwiązań technologicznych. Implementacja nowych funkcjonalności: Projektowanie i rozwój nowych modułów systemowych, integracji oraz funkcjonalności wspierających realizację celów biznesowych organizacji. Projektowanie i rozwój warstwy danych: Tworzenie, rozwój i optymalizacja struktur baz danych SQL i NoSQL, modelowanie danych oraz zapewnienie wydajnej komunikacji pomiędzy aplikacją a warstwą bazodanową. Integracja systemów i rozwój API: Implementacja oraz rozwój usług opartych o REST API, integracja z systemami zewnętrznymi oraz zapewnienie niezawodnej wymiany danych pomiędzy komponentami rozwiązania. Dbałość o jakość i automatyzację procesów: Tworzenie testów jednostkowych i automatycznych, udział w procesach CI/CD, wykorzystanie konteneryzacji oraz wdrażanie dobrych praktyk programistycznych zapewniających wysoką jakość kodu. Współpraca zespołowa i rozwój architektury: Aktywny udział w pracach zespołu projektowego, code review, dzieleniu się wiedzą oraz współtworzeniu architektury rozwijanych rozwiązań. Dokumentacja techniczna: Przygotowywanie i aktualizacja dokumentacji technicznej, projektowej oraz powykonawczej, wspierającej utrzymanie i dalszy rozwój aplikacji. Nasze wymagania: Minimum 2 lata doświadczenia w tworzeniu aplikacji webowej Przynajmniej 3 projekty realizowanych w zespole kilku osobowym lub samodzielnie - w pełnym cyklu wdrożenia rozwiązania od identyfikacji źródeł danych do uruchomienia aplikacji. Umiejętność wytwarzania stron internetowych w technice RWD (Bootstrap 4) w metodologii BEM Bardzo dobra znajomość HTML5, CSS3, SASS, SCSS oraz JavaScript Doświadczenie w pracy z jednym z Framework’ów: ReactJS , Angular, Vue, Redux Umiejętność pracy z API REST Znajomość technologii Python DJango, Flask, FastAPI Doświadczenie w pracy z bazami danych SQL jak i NoSQL Preferowane środowisko programistyczne: VS Code, PyCharm Znajomość konteneryzacji (Docker/Podman) Doświadczenie z procesami CI/CD Doświadczenie z GIS Umiejętność pisania testów z wykorzystaniem unittest/pytest Praca z wykorzystanym system kontroli wersji GIT Mile widziane: Doświadczenie z K8s Doświadczenie z GitLab Znajomość Jenkins oraz Selenium
Technology
FCB Health Spark
Full-stack Developer
Senior
Hybrid
Warsaw, Poland
13,000 - 16,000 PLN/mo
🏢 Summary: Full-stack Developer role focused on building and maintaining modern web applications using the JavaScript/TypeScript ecosystem with React 17+ and NestJS. The position involves developing scalable UI, designing REST APIs, working with SQL and NoSQL databases, and contributing to microservices-based architecture. Responsibilities include feature development, system integrations, testing, and maintaining high code quality standards. 🗂️ Requirements: Commercial experience with React 17+, Strong knowledge of TypeScript, Practical experience with Redux Toolkit and Zustand, Experience with NestJS and REST API development, Knowledge of SQL databases (MySQL or MariaDB), Basic knowledge of MongoDB, Experience with Docker, Ability to write unit and integration tests using Jest, Understanding of microservices architecture, Knowledge of SOLID, KISS, DRY and Clean Code principles, Experience with Linux CLI, Basic knowledge of CI/CD with GitHub Actions 📃 Skills: JavaScript, TypeScript, React, ReduxToolkit, Zustand, TailwindCSS, MaterialUI, NestJS, NodeJS, REST, SQL, MySQL, MariaDB, MongoDB, Jest, Docker, Linux, CICD, GitHubActions, Microservices 🏢 Description: Poszukujemy doświadczonego Full-stack Developera specjalizującego się w budowie nowoczesnych aplikacji webowych w oparciu o ekosystem JavaScript/TypeScript. Od wersji 17 aktywnie pracującego z Reactem, tworzącegi skalowalne i wydajne interfejsy użytkownika z naciskiem na czytelność kodu oraz wysoką jakość UX. Zależy nam na praktycznym doświadczeniu w zarządzaniu stanem aplikacji z wykorzystaniem Redux Toolkit oraz Zustand - dobierając narzędzia adekwatnie do złożoności projektu. W codziennej pracy powinien korzystać również z bibliotek komponentów, takich jak MUI (Material UI), przyspieszając development i dbając o spójność wizualną aplikacji. Oczekujemy, aby na warstwie backendowej pracował z NestJS, projektując i rozwijając REST API zgodnie z dobrymi praktykami architektonicznymi oraz zasadami czystego kodu. Kandydat powinien rozumieć koncepcje architektury mikroserwisowej i potrafić odnaleźć się w systemach rozproszonych. Zakres obowiązków: utrzymanie kodu istniejących aplikacji oparte o stack (docker, nodejs - nest, react, mysql, mongodb) wdrażanie nowych funkcjonalności w istniejącej aplikacji tworzenie rozwiązań ułatwiających korzystanie z platformy - raporty, analityka integracje nowych i istniejących systemów z zewnętrznymi REST API oparte o stack (docker, nodejs - nest, react, mysql, mongodb) wsparcie architekta systemów w projektowaniu nowych rozwiązań Oczekujemy: Kluczowe kompetencje techniczne: Frontend: • React 17+ • TypeScript • Redux Toolkit, Zustand • Tailwind CSS • MUI (Material UI) • Budowa responsywnych i skalowalnych UI • Integracja z REST API Backend: • NestJS • Tworzenie i rozwój REST API • Walidacja, autoryzacja, middleware • Projektowanie struktury aplikacji Bazy danych: • SQL • MySQL • MariaDB • MongoDB (podstawy) Testowanie: Jest - testy jednostkowe i integracyjne DevOps / Środowisko: • Docker - konteneryzacja aplikacji • Podstawy Linux (CLI, zarządzanie środowiskiem) - Podstawy CI CD w oparciu o GitHub Actions Architektura i dobre praktyki: • Znajomość architektury mikroserwisowej • Stosowanie zasad: • SOLID • KISS • DRY • Clean Code • Dbałość o modularność i skalowalność rozwiązań • Code review, standaryzacja struktury projektów Oferujemy: Współpracę B2B z wynagrodzeniem 13000- 16000 netto+VAT za 150h miesięcznie. Dużą samodzielność i realny wpływ na kształtowanie kierunku rozwoju produktu i procesów Możliwość pracy hybrydowej (biuro na Mokotowie) Swobodną i przyjazną atmosferę w zespole Pakiet benefitów - dofinansowanie do prywatnej opieki medycznej, karty Multisport, lekcji języka angielskiego oraz kafeteria MyBenefit
Technology
emagine Polska
Junior Fullstack Developer - Java & React (Lisbon/Porto)
Junior
Hybrid
Lisbon, Portugal
🏢 Summary: Fullstack Developer role focused on building and maintaining web applications using Java on the backend and React on the frontend. The position involves API design, database integration, and unit testing to deliver robust, high-quality software. Candidates will work across the full stack, contributing to both development and code quality processes. 🗂️ Requirements: 2+ years of Java programming experience, Strong knowledge of SQL, Experience with API definition, Proficiency in Git, Experience with JUnit testing, Proficiency in React, Proficiency in Next.js 📃 Skills: Java, React, Next.js, SQL, API, Git, JUnit 🏢 Description: Introduction & Summary: We are seeking a skilled Fullstack Developer specializing in Java and React. The ideal candidate will have over 2 years of experience in Java programming along with a solid understanding of modern frontend frameworks. The role requires proficiency in SQL and API definition, as well as experience with Git and Junit, making it essential for creating robust applications. Main Responsibilities: The Fullstack Developer will take on a pivotal role in our development team, responsible for both backend and frontend tasks. Develop and maintain web applications using Java and React. Define and implement APIs for seamless integration. Collaborate with cross-functional teams to design and deliver software solutions. Conduct unit testing to ensure high-quality code. Utilize Git for version control and collaboration. Key Requirements: 2+ years of experience in Java programming. Strong knowledge of SQL. Experience with API definition. Proficiency in Git. Experience with Junit testing. Proficient in frontend frameworks - React and Next.js. Nice to Have: Experience with Kafka and Spring Kafka (very nice to have). Some experience in microservices development. Familiarity with MongoDB. Experience with Spring Data JPA.