Fullstack Java Developer (Java + React/Next.js)

🏢 Summary: Fullstack Developer role focused on building and scaling a global SaaS e-commerce platform for the gastronomy industry. The position involves developing backend services in Java/Spring Boot and frontend applications in React/Next.js, integrating POS systems, payment providers, and hardware devices. The role requires active use of AI tools to support development, code review, and productivity. 🗂️ Requirements: Minimum 5 years of experience with Java (11/17), Experience with POS systems development and integration, Experience with hardware communication (fiscal printers, payment terminals), Knowledge of fiscalization processes, Strong knowledge of Spring Boot and Spring Security, Experience with Hibernate and REST API development, Experience with Maven and MySQL, Experience with GCP, Practical knowledge of React and Next.js, Strong knowledge of JavaScript and TypeScript, Experience building responsive user interfaces, Experience with Git and GitFlow, Openness to using AI tools (GPT, Claude Code, GitHub Copilot) in daily work, Basic knowledge of Scrum, Communicative English level 📃 Skills: Java, SpringBoot, SpringSecurity, Hibernate, REST, Maven, MySQL, GCP, React, Next.js, JavaScript, TypeScript, Git, GitFlow, POS, Stripe, PayPal, PayU, Adyen, Autopay, GPT, Claude, Copilot, Scrum 🏢 Description: UpMenu to globalna firma dostarczająca innowacyjne narzędzia e-commerce dla branży gastronomicznej. Dynamicznie rozwijamy się w wysoce konkurencyjnym środowisku i planujemy ekspansję na nowe międzynarodowe rynki. Szukasz nowych wyzwań w programowaniu fullstack? Dołącz do naszego zespołu i rozwijaj z nami globalną platformę UpMenu - od backendu w Javie, przez frontend w React/Next.js, aż po integrację z najnowszymi narzędziami AI! Twoje zadania Projektowanie i implementacja nowych funkcjonalności – backend (Java/Spring Boot) oraz frontend (React/Next.js) (70%) Identyfikacja i naprawa błędów (30%) Rozwój i integracja systemów POS z platformą UpMenu Integracja z hardware - drukarki fiskalne, terminale płatnicze Rozwijanie REST API Integracja z systemami płatności (Stripe, PayPal, PayU, Adyen, Autopay) Integracja z systemami sprzedażowymi (Foodsoft, POS Bistro, X2, Simple Gastronomy, Stava, Wolt, Uber, Stuart, Glovo, Pyszne) Aktywne wykorzystywanie narzędzi AI w codziennej pracy - GPT, Claude Code, GitHub Copilot i inne – do zwiększania produktywności, code review, generowania kodu i rozwiązywania problemów Nasze oczekiwania Backend Min. 5 lat doświadczenia w programowaniu w języku Java (11/17) Doświadczenie z: rozwojem i integracją POS-ów obsługą i komunikacją z urządzeniami hardware (drukarki fiskalne, terminale płatnicze) zagadnieniami fiskalizacji Znajomość technologii i narzędzi: Spring Boot, Spring Security Hibernate REST Maven MySQL Wzorce projektowe GCP Frontend Praktyczna znajomość React oraz Next.js Doświadczenie w budowaniu responsywnych interfejsów użytkownika Znajomość JavaScript/TypeScript Ogólne Git, GitFlow Otwartość na pracę z narzędziami AI (GPT, Claude Code, GitHub Copilot) - traktujemy je jako integralną część naszego procesu wytwórczego Podstawowa znajomość metodyki Scrum Znajomość języka angielskiego na poziomie komunikatywnym Chęć rozwoju i nauki nowych technologii Mile widziane Znajomość: GitLab i CI/CD, Docker, SDLC, DevOps Doświadczenie z Node.js Znajomość React Native JUnit/Mockito/Selenium Google Cloud Platform (w tym BigQuery) Kibana/Elasticsearch Handlebars Umiejętność pracy w Scrum w sprintach Doświadczenie w pracy z JIRA Co możemy Ci zaproponować? Formę zatrudnienia B2B Wynagrodzenie dopasowane do Twoich umiejętności: 18 000 - 22 000 PLN + VAT Niezbędne narzędzia pracy IntelliJ Ultimate + GitHub Copilot + Claude Code jako Twój codzienny AI-stack Pracę z najnowszymi technologiami - w tym intensywne wykorzystanie narzędzi AI w procesie developmentu Profesjonalny software development: Scrum, code reviews, dwutygodniowe sprinty, daily release Bliską współpracę z Tech Leadem Realny wpływ na rozwój produktu, z którego co miesiąc korzysta kilka milionów użytkowników Pracę zdalną (full remote) lub w biurze w Łodzi Atrakcyjne warunki współpracy / benefity Przyjazną, nieformalną atmosferę pracy (kameralna, 30-osobowa organizacja) Kilka faktów o UpMenu Jesteśmy firmą produktową (nie software house) Rozwijamy jeden produkt SaaS - globalną platformę e-commerce do zamówień online Obsługujemy klientów w 30+ krajach Stabilnie działamy od 2008 roku Korzystamy z najnowszych technologii i stale się rozwijamy Aktywnie wdrażamy AI do procesu wytwórczego - wierzymy, że przyszłość developmentu to synergia programisty i sztucznej inteligencji 📌 Osoby zainteresowane ofertą prosimy o aplikację przez przycisk „Aplikuj" . Informujemy, że skontaktujemy się tylko z wybranymi Kandydatami.

🏢 Summary: Oferta dla Fullstack Developera obejmuje tworzenie skalowalnych systemów i mikroserwisów z wykorzystaniem Java, Python oraz Angular/React, a także integrację rozwiązań AI i LLM. Rola obejmuje współtworzenie architektury, rozwój backendu i frontendu oraz wdrażanie nowoczesnych narzędzi AI w procesach developerskich. Praca jest w 100% zdalna z elastycznymi godzinami i udziałem w międzynarodowych projektach. 🗂️ Requirements: Minimum 2 lata doświadczenia komercyjnego, Bardzo dobra znajomość Java, Znajomość Spring, Znajomość Spring Boot, Znajomość Python, Doświadczenie z Angular, Znajomość TypeScript, Znajomość JavaScript, Znajomość HTML5, Znajomość CSS3, Doświadczenie z React, Doświadczenie z Docker, Doświadczenie z Kubernetes, Doświadczenie z OpenShift, Znajomość Maven, Znajomość npm, Znajomość Git, Znajomość Bitbucket, Umiejętność budowy mikrousług RESTful, Znajomość JSON, Znajomość XML, Język angielski na poziomie B2, Otwartość na kontakt z klientem 📃 Skills: Java, Python, Spring, SpringBoot, Angular, React, TypeScript, JavaScript, HTML5, CSS3, Docker, Kubernetes, OpenShift, Maven, npm, Git, Bitbucket, REST, JSON, XML, LLM, RAG, GenAI, AI, ML 🏢 Description: Dołącz do zespołu, który tworzy nowoczesne rozwiązania informatyczne – od pierwszych wersji MVP po rozbudowane systemy klasy Enterprise. Szukamy osoby, która lubi łączyć świat backendu i frontendu, współtworzyć architekturę rozwiązań oraz szukać najlepszych technologicznie sposobów realizacji projektów. Twój zakres obowiązków: Projektowanie i rozwój skalowalnych i wysokodostępnych rozwiązań zarówno w architekturze mikroserwisów jak również hybrydowych z wykorzystaniem AI (Backend w Java/Python, Frontend w Angular/React) Integracja systemów z modelami AI (LLM, RAG, agenci AI) przy użyciu Python i odpowiednich frameworków Analiza specyfiki rozwiązań i sugerowanie podejścia do realizacji Dbanie o jakość kodu i zgodność z obowiązującymi standardami Sprawdzanie/testowanie nowych narzędzi AI i wdrażanie ich (zarówno do kodu, jak i do procesów developerskich) Wymagania: Minimum 2 lata doświadczenia komercyjnego Bardzo dobra znajomość Java oraz Spring/Spring Boot, Python. Doświadczenie w rozwoju aplikacji frontendowych w Angular, TypeScript , JavaScript, HTML5 i CSS3, React Doświadczenie z konteneryzacją (Docker/ Kubernetes/ OpenShift) Znajomość narzędzi takich jak Maven, npm, Git i Bitbucket Biegłość w budowaniu mikrousług RESTful przy użyciu JSON i XML Zainteresowanie i nadążanie za rozwojem AI i nowymi narzędziami oraz doskonalenie własnego warsztatu Znajomość języka angielskiego na poziomie min. B2 Otwartość na kontakt z klientem Mile widziane: Doświadczenie z rozwiązaniami GenAI i modelami LLM Zrozumienie architektury modeli AI Wiedza na temat algorytmów ML (np. regresja liniowa, drzewa decyzyjne, k-means) Oferujemy: 100% pracę zdalną Elastyczne godziny pracy Niekorporacyjne podejście do pracy Długoterminowe, międzynarodowe projekty Szkolenia merytoryczne oraz budżet szkoleniowy - naszą wartością są ludzie, ich wiedza i doświadczenie, dlatego wspieramy ich rozwój finansując szkolenia Kartę Multisport, ubezpieczenie grupowe UNIQA i prywatną opiekę medyczną (LuxMed/ Medicover)

🏢 Summary: Backend Java Developer role focused on building and maintaining high-performance, scalable systems for transaction, payment, and cashier functionalities within a complex trading platform. The position involves developing RESTful and RPC APIs, handling high-concurrency and large-scale data processing in distributed environments, and integrating with third-party services. The role requires strong production troubleshooting skills and collaboration within cross-functional teams. 🗂️ Requirements: 5+ years of Java backend development experience, Strong experience with Java 8+, Strong experience with Spring Boot, Experience in fintech product development, Experience with B2B systems, Hands-on experience with high-concurrency and multi-threaded environments, Experience with high-volume traffic systems, Experience with large-scale data processing, Knowledge of MyBatis, Redis, and message queues, Experience with MySQL and complex query optimization, Experience with Elasticsearch, Experience with Hadoop or big data technologies, Experience with event-driven architectures, Experience with unit and integration testing, Experience integrating third-party APIs, Understanding of distributed systems and microservices, EU work permit and EU-based work availability 📃 Skills: Java, Spring, SpringBoot, MyBatis, Redis, MySQL, Elasticsearch, Hadoop, Dubbo, REST, RPC, SQL, Multithreading, Microservices, Kafka, RabbitMQ 🏢 Description: 🟣 You will be: designing, developing, and maintaining high-performance backend systems using Java and Spring Boot, working on transaction, payment, and cashier-related functionalities within a complex trading platform, building and maintaining RESTful and RPC APIs (e.g. using Apache Dubbo), developing solutions capable of handling high-volume traffic, high concurrency, and multi-threaded environments, processing and optimizing large volumes of data within distributed systems, collaborating with cross-functional teams to deliver scalable and reliable systems, integrating backend services with third-party applications and external systems, troubleshooting, debugging, and optimizing system performance in production environments. 🟣 Your profile: 5+ years of professional experience in Java backend development, strong experience with Java (8+) and Spring Boot, experience in business product development within fintech environments, experience working on B2B products, hands-on experience with high-concurrency systems, multi-threading, and high-volume traffic environments, proven experience working with large-scale data processing systems, solid knowledge of technologies such as MyBatis, Redis, and message queue systems, experience working with relational databases such as MySQL, including writing complex queries and performance tuning, experience working with Elasticsearch and big data technologies such as Hadoop, experience with messaging systems (queues) and event-driven architectures, experience with unit and integration testing, experience integrating with third-party services and APIs, strong debugging and problem-solving skills, solid understanding of software design patterns and backend architectures, practical experience using AI-powered assistants (e.g. Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision-making in software delivery, good communication skills and ability to work in a team environment, immediate availability or a short notice period is preferred. Work from the European Union region and a work permit are required. 🟣 Nice to have: familiarity with RPC frameworks such as Apache Dubbo, experience working with systems serving large-scale user bases, understanding of distributed systems and microservices architecture, experience applying GenAI in a more structured way within the SDLC, including defined workflows, prompt patterns, or tool integrations embedded into daily work, interest in and familiarity with emerging AI-driven practices (e.g. agent-based workflows, automation patterns, AI-augmented development), with a willingness to explore and experiment beyond standard approaches. 🟣 Recruitment Process: CV review – HR call – Technical Interview – Client Interview – Decision 🎁 Benefits 🎁 ✍ Development: development budgets of up to 6,800 PLN, we fund certifications e.g.: AWS, Azure, access to Udemy, O'Reilly (formerly Safari Books Online) and more, events and technology conferences, technology Guilds, internal training, Xebia Upskill. 🩺 We take care of your health: private medical healthcare, multiSport card - we subsidise a MultiSport card, mental Health Support. 🤸‍♂️ We are flexible: B2B or employment contract, contract for an indefinite period.

🏢 Summary: Senior-level role focused on designing and leading high-performance, scalable frontend and full-stack solutions for global ad delivery and tracking systems. The position emphasizes web performance optimization, observability (RUM and Synthetic), and architectural excellence across performance-critical features. You will drive measurable improvements in user metrics while maintaining top coding standards and technical leadership. 🗂️ Requirements: 8+ years of hands-on software engineering experience, Strong understanding of frontend development and internal mechanisms, Proven experience in web performance optimization and advanced loading strategies, Proficiency in JavaScript and TypeScript, Experience with modern frontend frameworks (React), Experience with build tools (Webpack or Vite), Knowledge of Internet protocols and technologies (DNS, HTTP, cookies), Experience monitoring and analyzing production systems, Understanding of full-stack concepts and backend APIs (Node.js, Python, or Java), Experience with deployment and CI/CD pipelines 📃 Skills: JavaScript, TypeScript, React, Node.js, Python, Java, Webpack, Vite, DNS, HTTP, Cookies, RUM, Synthetic, CICD, Caching, Monitoring 🏢 Description: You will: Design and lead implementation of system changes that deliver high performance, scalability and observability for displaying and tracking ads world wide. Develop tools and optimizations to drive measurable improvements in critical user performance metrics. Implement and maintain high-quality frontend and full-stack solutions for displaying Ads globally, focusing on extreme performance and scalability. Develop monitoring systems (RUM and Synthetic) to track crucial metrics like reliability or viewability and use data to diagnose and resolve performance bottlenecks. Collaborate closely with Ads Layouts specialists and backend engineers to ensure smooth data flow and optimal architectural alignment for performance-critical features. Write, test, and deploy robust, efficient, and well-documented code in JavaScript/TypeScript/Python/Java, ensuring adherence to the highest coding and performance standards. Provide hands-on technical leadership: solving complex system challenges, participating in planning and scoping of projects, and ensuring the implementation of the highest coding standards through participation in code reviews. Requirements: 8+ years of hands-on experience in software engineering, including the understanding of Frontend Development and its internal mechanisms. Practical experience and strong understanding of Web Performance optimization techniques and advanced loading strategies (caching, asset delivery). Solid proficiency in JavaScript/TypeScript and modern frameworks like e.g., React. Experience with relevant build tooling (e.g., Webpack, Vite). Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others). Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it). Good understanding of full-stack concepts, including working with backend APIs (Node.js, Python, or Java) and deployment/CI/CD pipelines. C1 level in English and Polish. Nice to have: Experience in the AdTech/Real Time Bidding space. Experience contributing to Real User Monitoring (RUM) systems. Selected technologies used: You will be working within a modern stack that includes JavaScript/TypeScript, React, Node.js, Python, and Java. We Offer: Projects focused on extreme performance and high code quality – solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Hardware and software tailored to your preferences (e.g., MacBook, AI tool licenses). Flexible working conditions – no core hours, fully remote cooperation possible. Apply now! You don't need to tick every box to apply. If you are passionate about software engineering or web performance, send us your CV, and we'll review it.

🏢 Summary: Lead the design and implementation of high-performance, scalable frontend and full-stack solutions for globally distributed ad systems, with a strong focus on web performance and observability. The role involves optimizing critical user metrics, building monitoring systems, and ensuring robust architecture and code quality across performance-sensitive features. 🗂️ Requirements: 8+ years of hands-on software engineering experience, Strong expertise in frontend development and internal browser mechanisms, Proven experience in web performance optimization and advanced loading strategies, Proficiency in JavaScript and TypeScript, Experience with modern frontend frameworks such as React, Experience with build tools such as Webpack or Vite, Solid understanding of Internet protocols including DNS and HTTP, Ability to monitor, analyze, and diagnose production system performance, Understanding of full-stack concepts and backend API integration, Experience with CI/CD pipelines 📃 Skills: JavaScript, TypeScript, React, Node.js, Python, Java, Webpack, Vite, DNS, HTTP, RUM, CICD, Caching 🏢 Description: You will: Design and lead implementation of system changes that deliver high performance, scalability and observability for displaying and tracking ads world wide. Develop tools and optimizations to drive measurable improvements in critical user performance metrics. Implement and maintain high-quality frontend and full-stack solutions for displaying Ads globally, focusing on extreme performance and scalability. Develop monitoring systems (RUM and Synthetic) to track crucial metrics like reliability or viewability and use data to diagnose and resolve performance bottlenecks. Collaborate closely with Ads Layouts specialists and backend engineers to ensure smooth data flow and optimal architectural alignment for performance-critical features. Write, test, and deploy robust, efficient, and well-documented code in JavaScript/TypeScript/Python/Java, ensuring adherence to the highest coding and performance standards. Provide hands-on technical leadership: solving complex system challenges, participating in planning and scoping of projects, and ensuring the implementation of the highest coding standards through participation in code reviews. Requirements: 8+ years of hands-on experience in software engineering, including the understanding of Frontend Development and its internal mechanisms. Practical experience and strong understanding of Web Performance optimization techniques and advanced loading strategies (caching, asset delivery). Solid proficiency in JavaScript/TypeScript and modern frameworks like e.g., React. Experience with relevant build tooling (e.g., Webpack, Vite). Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others). Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it). Good understanding of full-stack concepts, including working with backend APIs (Node.js, Python, or Java) and deployment/CI/CD pipelines. C1 level in English and Polish. Nice to have: Experience in the AdTech/Real Time Bidding space. Experience contributing to Real User Monitoring (RUM) systems. Selected technologies used: You will be working within a modern stack that includes JavaScript/TypeScript, React, Node.js, Python, and Java. We Offer: Projects focused on extreme performance and high code quality – solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Hardware and software tailored to your preferences (e.g., MacBook, AI tool licenses). Flexible working conditions – no core hours, fully remote cooperation possible. Apply now! You don't need to tick every box to apply. If you are passionate about software engineering or web performance, send us your CV, and we'll review it.

🏢 Summary: Senior engineer role focused on designing and implementing high‑performance, scalable frontend and full‑stack solutions for global ad delivery systems. The position emphasizes web performance optimization, observability, and monitoring (RUM and Synthetic) to improve critical user metrics. You will lead technical initiatives, build performance‑critical features, and ensure high code quality across JavaScript/TypeScript-based systems. 🗂️ Requirements: 8+ years of hands-on software engineering experience, Strong understanding of frontend development and internal browser mechanisms, Practical experience with web performance optimization techniques, Proficiency in JavaScript and TypeScript, Experience with modern frontend frameworks (React), Experience with build tools (Webpack or Vite), Knowledge of Internet protocols (DNS, HTTP, cookies), Experience monitoring and analyzing production systems, Understanding of full-stack architecture and backend APIs (Node.js, Python, or Java), Experience with CI/CD pipelines 📃 Skills: JavaScript, TypeScript, React, Node.js, Python, Java, Webpack, Vite, DNS, HTTP, cookies, CI/CD, RUM, Synthetic, caching, observability, APIs 🏢 Description: You will: Design and lead implementation of system changes that deliver high performance, scalability and observability for displaying and tracking ads world wide. Develop tools and optimizations to drive measurable improvements in critical user performance metrics. Implement and maintain high-quality frontend and full-stack solutions for displaying Ads globally, focusing on extreme performance and scalability. Develop monitoring systems (RUM and Synthetic) to track crucial metrics like reliability or viewability and use data to diagnose and resolve performance bottlenecks. Collaborate closely with Ads Layouts specialists and backend engineers to ensure smooth data flow and optimal architectural alignment for performance-critical features. Write, test, and deploy robust, efficient, and well-documented code in JavaScript/TypeScript/Python/Java, ensuring adherence to the highest coding and performance standards. Provide hands-on technical leadership: solving complex system challenges, participating in planning and scoping of projects, and ensuring the implementation of the highest coding standards through participation in code reviews. Requirements: 8+ years of hands-on experience in software engineering, including the understanding of Frontend Development and its internal mechanisms. Practical experience and strong understanding of Web Performance optimization techniques and advanced loading strategies (caching, asset delivery). Solid proficiency in JavaScript/TypeScript and modern frameworks like e.g., React. Experience with relevant build tooling (e.g., Webpack, Vite). Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others). Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it). Good understanding of full-stack concepts, including working with backend APIs (Node.js, Python, or Java) and deployment/CI/CD pipelines. C1 level in English and Polish. Nice to have: Experience in the AdTech/Real Time Bidding space. Experience contributing to Real User Monitoring (RUM) systems. Selected technologies used: You will be working within a modern stack that includes JavaScript/TypeScript, React, Node.js, Python, and Java. We Offer: Projects focused on extreme performance and high code quality – solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Hardware and software tailored to your preferences (e.g., MacBook, AI tool licenses). Flexible working conditions – no core hours, fully remote cooperation possible. Apply now! You don't need to tick every box to apply. If you are passionate about software engineering or web performance, send us your CV, and we'll review it.

🏢 Summary: Full Stack Developer role with a primary focus on backend development in Java, responsible for building and maintaining scalable, secure microservices and REST APIs within an Agile environment. The position involves database design, cloud integration, and CI/CD pipeline participation, with additional work on modern React-based frontend components. The role emphasizes high code quality, performance optimization, and secure application architecture. 🗂️ Requirements: 5+ years experience in Full Stack or Backend development, Strong proficiency in Java, Experience with Spring Boot, Hibernate, JPA, Experience building REST APIs and microservices, Knowledge of OAuth2 and JWT authentication, Experience with SQL and NoSQL databases, Experience with CI/CD pipelines, Experience with Docker and Kubernetes, Cloud platform experience (AWS, Azure, or GCP), Experience working in Agile teams, Bachelor’s or Master’s degree in Computer Science or related field 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, REST, Microservices, OAuth2, JWT, PostgreSQL, MySQL, MongoDB, Redis, React, Redux, TypeScript, JavaScript, HTML5, CSS3, MaterialUI, Bootstrap, Tailwind, Jenkins, GitHubActions, GitLab, Docker, Kubernetes, AWS, Azure, GCP 🏢 Description: Overview We are a company leveraging AI to optimize business operations. Our mission is to provide digital solutions and consulting services that help companies grow and create value. By using modern technology, we simplify processes, increase efficiency, and discover new revenue opportunities—especially in private capital markets. Our ecosystem includes: PaaS (Platform as a Service): A core platform that enhances workflows, provides actionable insights, and supports value creation. SaaS (Software as a Service): A cloud platform offering robust performance and intelligent tools at scale. S&C (Solutions & Consulting): Flexible tools and methodologies to manage, grow, and improve company performance. With over 10 years of experience working with fast-growing companies and private equity businesses, we know how to harness technology to deliver tangible business advantages. Job Description We are looking for Full Stack Developer with strong Java expertise. While your main focus will be backend systems, experience with modern frontend technologies (React.js, TypeScript) is also required. You will join an Agile team to design, build, and maintain scalable, secure, and high-performing applications. Key Responsibilities Backend Development (Primary Focus) Develop and maintain REST APIs and microservices using Java (Spring Boot, Hibernate, JPA). Implement secure authentication, authorization, and data handling mechanisms. Design and optimize databases (PostgreSQL, MySQL, MongoDB) for performance and reliability. Integrate with third-party APIs, cloud services, and internal systems. Participate in deployment pipelines using CI/CD tools (Jenkins, GitHub Actions, GitLab CI/CD) and containerization (Docker, Kubernetes). Frontend Development (Nice-to-Have) Build responsive UI components using React.js, Redux, and modern JavaScript/TypeScript. Apply best practices in UI/UX design, performance optimization, and cross-browser compatibility. Work with UI frameworks like Material-UI, Bootstrap, or Tailwind CSS. Code Quality & Testing Write clean, maintainable, and well-documented code. Create unit and integration tests for backend services, and frontend components if applicable. Collaboration & Agile Development Collaborate with designers, product managers, and DevOps engineers. Participate in Agile/Scrum ceremonies and contribute to process improvement initiatives. Required Skills & Experience Backend Strong proficiency in Java , Spring Boot, Hibernate, JPA, and REST API development. Experience with microservices architecture and API Gateway. Knowledge of authentication/authorization protocols: OAuth2, JWT, sessions. Frontend (Optional / Nice-to-Have) Experience with React.js, Redux, TypeScript, HTML5, CSS3, and modern JavaScript. Understanding of state management and component-based design. Familiarity with UI libraries/frameworks: Material-UI, Bootstrap, or Tailwind CSS. Database & DevOps SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis). CI/CD pipelines (Jenkins, GitHub Actions, GitLab CI/CD). Cloud platform experience (AWS, Azure, GCP) and containerization (Docker/Kubernetes). Qualifications Bachelor’s or Master’s degree in Computer Science, Engineering, or related field. 5+ years of experience as a Full Stack or Backend Developer. Experience working in Agile teams. Strong problem-solving and analytical skills. Soft Skills Excellent communication and teamwork abilities. Ability to manage multiple tasks in a fast-paced environment. Eagerness to learn new technologies and improve processes.

🏢 Summary: Senior Frontend Developer / Technical Team Leader role focused on building and optimizing modern e-commerce and digital experience applications in MACH architecture. The position involves leading frontend initiatives, implementing new features, conducting code reviews, and supporting technology decisions in a collaborative environment. The role requires strong expertise in React ecosystem technologies, headless architecture, performance optimization, and modern development practices including AI-assisted workflows. 🗂️ Requirements: Minimum 5 years of frontend development experience, Experience with REST API, Experience with WebSocket, Very good knowledge of React, Knowledge of Next.js, Experience with Headless architecture, Experience with Headless CMS, Knowledge of HTML, Knowledge of CSS/SCSS, Knowledge of JavaScript, Knowledge of TypeScript, Knowledge of shadcn, Knowledge of Tailwind CSS, Knowledge of Tanstack Query, Knowledge of Vite, Knowledge of React Testing Library, Experience in frontend performance optimization, Knowledge of Core Web Vitals, Knowledge of ESLint, Knowledge of Prettier, Knowledge of Git, Experience using AI development tools, Knowledge of Spec-Driven Development, Experience identifying and analyzing security vulnerabilities, English level B2 or higher 📃 Skills: React, Next.js, REST, WebSocket, Strapi, HTML, CSS, SCSS, JavaScript, TypeScript, shadcn, Tailwind, Tanstack, Vite, Testing, ESLint, Prettier, Git, ChatGPT, Copilot, Claude, JIRA, GitLab, Docker, Zod, Turborepo, WCAG, OWASP 🏢 Description: O firmie: Univio to partner cyfrowej transformacji handlu, z ponad 25-letnim doświadczeniem i niemal 500 projektami na koncie. Pomagamy klientom takim jak mBank, Super-Pharm, SIG, Bakalland, Onninen czy Volkswagen Group Polska wdrażać innowacyjne rozwiązania e-commerce, systemy PIM, portale B2B i B2C, nowoczesne UX oraz zaawansowane systemy integracyjne. Jeśli chcesz pracować z wiodącymi markami i realnie wpływać na cyfrową przyszłość handlu, dołącz do nas! O zespole: Jesteśmy zespołem MachArena i wdrażamy u naszych klientów architekturę IT właśnie w podejściu MACH. W Univio pomagamy naszym klientom – dużym i znanym markom – przechodzić cyfrową transformację i wnosić ich biznes na kolejny level. Jednym z elementów tej zmiany jest budowanie architektury w podejściu composable i rozwijanie elastycznych rozwiązań opartych o mikroserwisy, API, Cloud i Headless (MACH). Do naszej wesołej ekipy poszukujemy Senior Frontend Developera/Technical Team Leadera! Jeśli chcesz prowadzić zespół i rozwijać nowoczesne systemy digital experience oraz e-commerce w dynamicznym i wspierającym środowisku, zapraszamy do nas! Wkrocz na naszą MachArenę i twórz z nami przyszłość technologii! 😊 🧡 Na czym będzie polegać Twoja praca? Do Twoich zadań będzie należeć: Implementacja nowych funkcjonalności i poprawa błędów w istniejących Budowanie aplikacji frontowych pod sklepy internetowe i wewnętrzne aplikacje internetowe Przeprowadzanie code review Monitorowanie jakości kodu oraz optymalizacja Estymacja pracochłonności zadań w JIRA Udział w spotkaniach projektowych Wsparcie zespołu w doborze technologii - w zakresie roli liderskiej 🧡 Twój profil Minimum 5-letnie doświadczenie w technologiach front-endowych Doświadczenie w pracy z REST API oraz Websocket Bardzo dobra znajomość React Znajomość Next.js Doświadczenie w pracy z architekturą Headless oraz systemami Headless CMS ( Strapi) Znajomość HTML, CSS/SCSS, JavaScript, TypeScript Znajomość shadcn , Tailwind CSS, Tanstack Query , Vite oraz React Testing Library, Doświadczenie w optymalizacji aplikacji front-endowych, w szczególności pod kątem wydajności, Core Web Vitals Dbałość o jakość wytwarzanego kodu oraz znajomość narzędzi do statycznej analizy kodu, takich jak ESLint, Prettier lub podobne . Znajomość systemu kontroli wersji Git Masz doświadczenie w pracy z narzędziami AI , np. ChatGPT, GitHub Copilot, Claude , i potrafisz efektywnie wykorzystywać je w codziennych zadaniach programistycznych Jesteś otwarta/y na nowoczesne metodyki wytwarzania oprogramowania, w tym wykorzystanie AI oraz podejście Spec-Driven Development Doświadczenie w identyfikowaniu i analizie podatności bezpieczeństwa oraz podejmowaniu świadomych decyzji dotyczących ich wpływu i priorytetu Znajomość języka angielskiego na poziomie minimum B2 🧡 Dodatkowe plusy Super, jeśli masz również: Doświadczenie z GitLab Pipeline Znajomość Docker, Docker Compose Znajomość TanStack Start ( TanStack Router ), Zod , React Hook Form , mono repo ( Turborepo ) Praktyczna znajomość dobrych praktyk accessibility w tym np. WCAG Znajomość standardu OWASP Top 10 oraz OWASP ASVS Na co możesz liczyć, dołączając do nas: 🟪Kartę Multisport – abyś mógł zadbać o aktywność i energię po pracy, 🟪Prywatną opiekę medyczną – Twoje zdrowie jest dla nas priorytetem, 🟪Ubezpieczenie na życie – dodatkowe bezpieczeństwo dla Ciebie i Twoich bliskich, 🟪Grupowe zajęcia języka angielskiego z lektorem oraz darmowy dostęp do eTutor – bo rozwój językowy otwiera nowe możliwości, 🟪Firmową bibliotekę – pełną inspirujących książek i materiałów, 🟪 Wellbeing Week – czas na zadbanie o równowagę, zdrowie i dobrą energię całego zespołu. Jak wygląda nasz proces rekrutacyjny? 1️⃣Aplikujesz na ogłoszenie - Wysyłasz swoje CV, a my nie możemy się doczekać, żeby je zobaczyć 2️⃣Rozmowa z rekruterem - Nasza rekruterka, Patrycja , zadzwoni na ok. 40 minut do Ciebie po weryfikacji CV, żeby lepiej Cię poznać i opowiedzieć o wszystkim, co musisz wiedzieć 3️⃣Spotkanie z managerem i tech-check – Około tydzień od rozmowy będziesz miał(a) okazję porozmawiać z osobą, która może być Twoim przyszłym liderem. Takie spotkanie średnio trwa 1,5 godziny 4️⃣Decyzja - Po wszystkim do dwóch tygodni wrócimy do Ciebie z odpowiedzią. Trzymamy kciuki! 🤞

🏢 Summary: Backend-focused Full Stack Developer role centered on designing and building scalable, secure Java-based applications within an Agile environment. The position emphasizes backend development with Spring Boot and microservices, while contributing to CI/CD, cloud deployments, and optionally modern React-based frontend components. You will develop high-performing systems, integrate APIs, and ensure code quality through testing and best practices. 🗂️ Requirements: 5+ years experience as Java Backend or Full Stack Developer, Strong proficiency in Java, Experience with Spring Boot, Hibernate, JPA, Experience building REST APIs and microservices, Knowledge of OAuth2 and JWT authentication, Experience with SQL and NoSQL databases, Experience with CI/CD pipelines, Experience with Docker and Kubernetes, Experience with AWS, Azure or GCP, Bachelor’s or Master’s degree in Computer Science or related field, Experience working in Agile teams 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, REST, Microservices, OAuth2, JWT, PostgreSQL, MySQL, MongoDB, Redis, Jenkins, GitHubActions, GitLab, Docker, Kubernetes, AWS, Azure, GCP, React, Redux, TypeScript, HTML5, CSS3 🏢 Description: Overview We are a company leveraging AI to optimize business operations. Our mission is to provide digital solutions and consulting services that help companies grow and create value. By using modern technology, we simplify processes, increase efficiency, and discover new revenue opportunities—especially in private capital markets. Our ecosystem includes: PaaS (Platform as a Service): A core platform that enhances workflows, provides actionable insights, and supports value creation. SaaS (Software as a Service): A cloud platform offering robust performance and intelligent tools at scale. S&C (Solutions & Consulting): Flexible tools and methodologies to manage, grow, and improve company performance. With over 10 years of experience working with fast-growing companies and private equity businesses, we know how to harness technology to deliver tangible business advantages. Job Description We are looking for a Backend-Focused Full Stack Developer with strong Java expertise. While your main focus will be backend systems, experience with modern frontend technologies (React.js, TypeScript) is a valuable plus. You will join an Agile team to design, build, and maintain scalable, secure, and high-performing applications. Key Responsibilities Backend Development (Primary Focus) Develop and maintain REST APIs and microservices using Java (Spring Boot, Hibernate, JPA). Implement secure authentication, authorization, and data handling mechanisms. Design and optimize databases (PostgreSQL, MySQL, MongoDB) for performance and reliability. Integrate with third-party APIs, cloud services, and internal systems. Participate in deployment pipelines using CI/CD tools (Jenkins, GitHub Actions, GitLab CI/CD) and containerization (Docker, Kubernetes). Frontend Development (Nice-to-Have) Build responsive UI components using React.js, Redux, and modern JavaScript/TypeScript. Apply best practices in UI/UX design, performance optimization, and cross-browser compatibility. Work with UI frameworks like Material-UI, Bootstrap, or Tailwind CSS. Code Quality & Testing Write clean, maintainable, and well-documented code. Create unit and integration tests for backend services, and frontend components if applicable. Collaboration & Agile Development Collaborate with designers, product managers, and DevOps engineers. Participate in Agile/Scrum ceremonies and contribute to process improvement initiatives. Required Skills & Experience Backend Strong proficiency in Java , Spring Boot, Hibernate, JPA, and REST API development. Experience with microservices architecture and API Gateway. Knowledge of authentication/authorization protocols: OAuth2, JWT, sessions. Frontend (Optional / Nice-to-Have) Experience with React.js, Redux, TypeScript, HTML5, CSS3, and modern JavaScript. Understanding of state management and component-based design. Familiarity with UI libraries/frameworks: Material-UI, Bootstrap, or Tailwind CSS. Database & DevOps SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis). CI/CD pipelines (Jenkins, GitHub Actions, GitLab CI/CD). Cloud platform experience (AWS, Azure, GCP) and containerization (Docker/Kubernetes). Qualifications Bachelor’s or Master’s degree in Computer Science, Engineering, or related field. 5+ years of experience as a Full Stack or Backend Developer (Java-focused). Experience working in Agile teams. Strong problem-solving and analytical skills. Soft Skills Excellent communication and teamwork abilities. Ability to manage multiple tasks in a fast-paced environment. Eagerness to learn new technologies and improve processes.

🏢 Summary: Senior Backend / Full Stack Engineer role focused on designing and building scalable APIs, backend services, and merchant-facing reporting features for a restaurant technology platform. The position involves end-to-end development of data-driven dashboards and analytics tools, contributing to cloud architecture, DevOps practices, and system reliability. The engineer will collaborate cross-functionally while shaping technical decisions and mentoring other developers. 🗂️ Requirements: 5+ years backend or full-stack engineering experience, Strong proficiency in Python, Experience with Go, Experience with TypeScript or JavaScript, Experience building and consuming RESTful APIs, Proficiency with React, Experience with PostgreSQL, Experience with MongoDB, Experience with AWS services, Experience with Docker, Experience with Kubernetes, Experience with CI/CD pipelines 📃 Skills: Python, Go, TypeScript, JavaScript, React, REST, PostgreSQL, MongoDB, AWS, IAM, S3, RDS, Lambda, Docker, Kubernetes, CI/CD, ClickHouse, Kafka, Snowflake, ETL, Grafana, OpenTelemetry 🏢 Description: We’re not just building restaurant tech—we’re giving independent restaurants the tools to compete and win. From our award-winning point-of-sale to AI-powered profit tools, everything we do helps operators boost profit, work smarter, and keep their best people. And every solution is backed by real humans who actually give a sh*t about helping restaurants succeed. Named the #1 Restaurant POS by G2 (Fall 2025), based on ratings from real users Rated the top-rated point-of-sale (POS) for restaurants, bars, retail, and small businesses by Capterra users Awarded Great Places to Work and Built In’s Best Workplaces for multiple years running We move fast, care hard, and fight for independent restaurant operators to do what they love, and love doing it. If you’re looking to make an impact with heart and hustle, SpotOn is the place for you. As a Senior Software Engineer — Backend / Full Stack on our Data and Reporting team, you’ll design, build, and own the systems and experiences that help restaurant operators understand their business. You’ll architect scalable backend services and APIs, work across the stack to deliver merchant-facing reporting features, and collaborate closely with product, design, and data teams. This role offers meaningful autonomy—your technical judgment will directly shape the product and the platform. On a daily basis you will: Design and build scalable RESTful APIs and backend services that power merchant-facing reporting and analytics features. Develop full-stack features end-to-end—from backend data models and APIs through to frontend components and data visualizations. Build and maintain responsive, accessible reporting dashboards and chart visualizations that help merchants make better business decisions. Collaborate with product managers, designers, and data engineers to define requirements and deliver polished, high-quality experiences. Contribute to system architecture decisions, including cloud infrastructure (AWS), containerization, and CI/CD pipeline improvements. Conduct code reviews, establish technical standards, and mentor junior and mid-level engineers on best practices. Implement monitoring, logging, and alerting solutions to ensure platform reliability and observability. What skill are we looking for? 5+ years of professional backend or full-stack software engineering experience Strong proficiency in Python; experience with Go and TypeScript or JavaScript is highly beneficial. Solid experience building and consuming RESTful APIs, with a strong understanding of API design best practices. Proficiency with React—comfortable building and maintaining complex component architectures and data-driven UIs. Experience with relational and NoSQL databases, especially PostgreSQL and MongoDB. Familiarity with cloud services, particularly AWS (IAM, S3, RDS, Lambda). Comfortable with containerization and orchestration tools such as Docker and Kubernetes. Strong experience with CI/CD pipelines and modern DevOps methodologies. Strong communication skills and the ability to collaborate effectively with cross-functional teams. Comfort with ambiguity and the judgment to make sound product and technical decisions independently. Perfect candidate also has: Experience with infrastructure as code (IaC) tools and best practices. Background or interest in data engineering concepts—familiarity with tools like ClickHouse, Kafka, Snowflake, or ETL pipelines is a plus. Knowledge of data observability and monitoring tools, including Grafana and OpenTelemetry. Experience building analytics dashboards or reporting interfaces. Experience in the restaurant or hospitality technology sector. Here’s a bit about what we have to offer: Competitive pay: 19 500 - 24 400 PLN net on B2B. Training budget 3500 PLN gross per year. Access to e-learning platforms (O’Reilly). Fully paid private healthcare in LuxMed. Access to the Worksmile platform with a monthly top-up. Subsidized access to breakfast and lunch through the vending machine in Kraków office, and lunches in Gdańsk office once a week. Group English classes with a native speaker. New Macbook Pro, 4K monitors or whatever tools you need. Flexible working hours. New, modern, bright and comfortable office space in the city centre. Access to the company’s library. Great working atmosphere. Chill out room with a PlayStation and games. Free snacks and beverages in a kitchen. Company parties and social activities. Employee referral program. Relocation Package within Poland.