April 24, 2026

Full-stack Developer (java/react)

Senior • Hybrid

110 - 130 PLN

Warsaw, Poland

Poszukujemy doświadczonego Full-stack Developera (java/react), który dołączy do zespołu rozwijającego nowoczesne rozwiązania w obszarze Data Lake, DWH oraz „chat with data”. Praca obejmuje zarówno rozwój backendu, jak i współpracę przy projektowaniu interfejsów oraz komponentów frontendowych.

 

Oferujemy

  • Długoterminowa współpraca w oparciu o kontrakt B2B

  • Prywatna opieka medyczna

  • Karta multisportowa

  • Udział w nowoczesnych projektach

  • Praca hybrydowa – min. 1 dzień w tygodniu w biurze (Poznań lub Warszawa)

 

Obowiązki

  • Budowa i rozwój rozwiązań Data Lake i Data Warehouse (online/offline)

  • Projektowanie i implementacja procesów zasilania danych

  • Modelowanie danych (logiczne i fizyczne)

  • Optymalizacja zapytań SQL (on-prem i GCP)

  • Tworzenie pipeline’ów danych (on-prem oraz chmura GCP)

  • Rozwój narzędzia „chat with data” (end-to-end)

  • Współpraca przy projektowaniu rozwiązań IT zgodnych z wymaganiami biznesowymi

  • Obsługa incydentów i rozwiązywanie problemów produkcyjnych

  • Wsparcie testów i wdrożeń

  • Utrzymanie i serwisowanie systemów

  • Praca w modelu DevSecOps

 

Wymagania

  • Znajomość frontend’u: React

  • Doświadczenie w budowie aplikacji webowych z elementami konwersacyjnymi (chat), w tym:

    • streaming odpowiedzi

    • historia rozmów

    • feedback użytkownika

    • prezentacja źródeł i uzasadnień

  • Doświadczenie backendowe:

    • Java – projektowanie i rozwój usług API

  • Podstawowa znajomość BigQuery / SQL

  • Umiejętność projektowania ergonomicznego UI dla danych:

    • tabele, wykresy, drill-down, eksport wyników

  • Doświadczenie w pracy zespołowej:

    • Git, code review, standardy jakości, dokumentacja

    • testy (unit / integration / e2e)

  • Doświadczenie produkcyjne:

    • CI/CD, monitoring, logowanie

    • reagowanie na incydenty

  • Gotowość do współpracy z AI Engineerami i zespołami data:

    • kontrakty API, formaty danych, walidacje, optymalizacja kosztów


Mile widziane

  • Znajomość rozwiązań typu semantic / metrics layer (caching, pre-aggregations, governance metryk)

  • Doświadczenie z narzędziami „conversational analytics” / „chat with data”

  • Znajomość bibliotek UI i data visualization

  • GCP: Cloud Run, Pub/Sub

  • Docker / Kubernetes

  • Doświadczenie w środowisku regulowanym (np. bankowość)

 

Ta rola nie jest dla Ciebie, ale masz znajomego, który by się sprawdził? Poleć go i zgarnij nawet 5000 zł.

Referral Program: Talent from your network



Nie zwlekaj i zaaplikuj już teraz!

 

Nr ref.: 30/4/2026/r/3382

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Hybrid

Warsaw, Poland

🏢 Summary: Fullstack Developer (Java + JS) role in a small, decision-making team building a reference data management system. The position involves developing and evolving an existing system with real impact on architecture and technical decisions. Initially remote with a transition to regular collaboration in Warsaw (remote/hybrid possible). 🗂️ Requirements: Strong backend development in Java, Proficiency in JavaScript, Experience with React or Vue or SmartClient or similar framework, Ability to work with and extend existing systems, Willingness to use AI development tools, Basic knowledge of SQL, Experience with AWS or GCP, Polish B2, English B2 📃 Skills: Java, JavaScript, React, Vue, SmartClient, SQL, AWS, GCP, Copilot 🏢 Description: Szukam Fullstack Developer  (Java + JS) do małego, decyzyjnego zespołu. Budujemy system do zarządzania danymi referencyjnymi i szukamy osoby, która chce mieć realny wpływ na to, jak to działa – bez korpo-warstw i bez „ticket factory” Forma zatrudnienia: B2B - rozliczenie godzinowe Praca zdalna: początkowo (3 dni/tydz. ~3 miesiące) Warszawa docelowo: 5 dni/tydz. (zdalnie / hybrydowo – do ustalenia) 💻 Stack (w skrócie): Java + JavaScript + React/Vue/Smartclient/podobne 🧠 Kogo szukam: Kogoś, kto: ogarnia backend w Javie i swobodnie porusza się w JS pracował z Reactem , Vue, SmartClient, podobnym nie boi się wejść w istniejący system i go rozwijać korzysta (albo chce korzystać) z AI w devie (Copilot itd.) ➕ Na plus: podstawy SQL doświadczenie z AWS / GCP 🌍 Język: PL: B2 EN: B2 🔥 Co jest fajne w tej roli: mały zespół → szybkie decyzje realny wpływ na architekturę brak korporacyjnego chaosu Jeśli masz ochotę pogadać – napisz do mnie na priv (rafal.jastrzebski@sanmargar.com) albo wrzuć CV (office@sanmargar.com) 👍

Technology

ITDS

Java & React Full Stack Developer – Cloud & Data Projects

Mid

Hybrid

Krakow, Poland

23,100 - 28,350 PLN

🏢 Summary: Full Stack Developer role focused on migrating critical banking reporting systems to the cloud and building scalable web applications in a microservices architecture. The position combines Java and React development with cloud technologies to enhance data and reporting platforms. Work in an agile, cross-country team delivering secure, high-quality financial solutions. 🗂️ Requirements: 3+ years experience in large-scale full-stack web applications, Experience with microservices architecture, Proficiency in Java 17+, Strong knowledge of Spring and Spring Boot, Experience in RESTful API development, Expertise in ReactJS, Strong knowledge of JavaScript and TypeScript, Hands-on experience with Google Cloud Platform, Experience with relational databases or data warehouses, Experience with Git and SCM systems, Knowledge of CI/CD pipelines, Fluent English, Legal right to work in the EU 📃 Skills: Java, Spring, SpringBoot, REST, ReactJS, JavaScript, TypeScript, GCP, PostgreSQL, BigQuery, AlloyDB, Git, GitHub, Jenkins, Microservices, CI/CD 🏢 Description: Unleash innovation at the intersection of cloud, data, and full-stack development — shape the future of banking technology! Krakow-based opportunity with hybrid work model (up to 3 days remote per week). As a Java & React Full Stack Developer , you will be working for our client, a leading global financial institution, supporting the transformation of their data and reporting systems within the International Wealth & Premier Banking division. You will be instrumental in migrating critical reporting platforms to the cloud and developing scalable, web-based applications that enhance decision-making and operational efficiency. Join a dynamic team committed to technological excellence and career growth in the finance sector. Your main responsibilities: Independently design, develop, test, and deploy web applications in a collaborative, cross-country environment. Support the migration of existing reporting systems to cloud-based platforms, ensuring seamless transition and minimal disruption. Mentor and guide team members, facilitating knowledge transfer and best practices for technology stack evolution. Ensure development adherence to IT methodologies, security standards, and documentation requirements. Work in an agile environment to deliver high-quality features aligned with client needs. You're ideal for this role if you have: 3+ years of experience in delivering large-scale full-stack web applications with microservice architecture. Strong proficiency in Java (Java 17+ preferred), Spring/Spring Boot, and RESTful API development. Expertise in ReactJS, JavaScript, and TypeScript. Hands-on experience with Google Cloud Platform products. Working knowledge of relational databases/data warehouses such as PostgreSQL, BigQuery, or AlloyDB. Experience with Git and SCM systems like GitHub. Knowledge of data visualization tools (e.g., Apache ECharts) is an advantage. Understanding of CI/CD pipelines, particularly Jenkins. It is a strong plus if you have: Certifications or experience in cloud architecture or DevOps practices. Language Required for the role: Fluent English communication skills are essential. Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.