Senior Fullstack Engineer – React and Kotlin Specialists

🏢 Summary: Senior Fullstack Engineer role focused on building intelligent advertising systems using React and Kotlin, including ML-driven recommendation engines and automated campaign management tools. The position involves developing scalable, event-driven cloud architectures and high-performance APIs for analytical platforms within a GCP environment. Hybrid work model in Warsaw with strong emphasis on modern microservices and microfrontend architectures. 🗂️ Requirements: Minimum 3 years of full-stack development experience, Strong experience with React and Kotlin, Proficiency in TypeScript, HTML, CSS, Experience with Spring Boot and microservices architecture, Experience with GCP cloud environment, Experience with MongoDB and SQL databases, Understanding of event-driven architectures and large-scale data processing, Experience with testing frameworks such as Jest, Vitest, or Playwright, Communicative Polish and English, Legal right to work in the European Union 📃 Skills: Kotlin, React, TypeScript, HTML, CSS, SpringBoot, MongoDB, SQL, GCP, Microservices, Microfrontends, Jest, Vitest, Playwright, APIs, SSR, Accessibility, EventDriven 🏢 Description: Unleash innovation — design the future of intelligent advertising ecosystems! Warszawa-based opportunity with hybrid work model. As a Senior Fullstack Engineer – React and Kotlin Specialists , you will be working for our client, a leader in building advanced advertising tools, focusing on creating intelligent recommendation systems and automating campaign management for advertisers on Allegro Ads. Join a mission-driven project that revolutionizes how businesses grow through cutting-edge technology and data-driven insights, offering exciting avenues for professional growth and innovation. Your main responsibilities: Develop and maintain backend services using Kotlin, integrating machine learning-driven recommendation engines in collaboration with data science teams. Build scalable, event-driven architectures to process large data volumes within cloud environments, leveraging GCP. Design and implement high-performance APIs to support analytical dashboards and market benchmarks. Create and optimize scalable microfrontends using React, prioritizing accessibility and server-side rendering for analytical tools. Collaborate with cross-functional teams to deliver seamless, secure, and efficient software solutions. Ensure high code quality through testing frameworks such as Jest, Vitest, or Playwright, with a focus on performance and reliability. Contribute to evolving microservice architectures, utilizing Spring Boot, MongoDB, SQL, and cloud-native tools. Participate actively in code reviews, sprint planning, and technical discussions to foster continuous improvement. You're ideal for this role if you have: At least 3 years of experience in full-stack development, with a focus on React and Kotlin. Strong proficiency in TypeScript, React, HTML/CSS, and backend technologies like Kotlin, Spring Boot, and microservices. Experience working with cloud ecosystems, preferably GCP. Solid understanding of database management, including MongoDB and SQL. Familiarity with event-driven architectures and large-scale data processing. Ability to communicate effectively in Polish and English. Experience working in an Agile environment with a focus on delivering high-quality software. It is a strong plus if you have: (optional) Certifications related to GCP or microservices architecture. Experience with agentic coding tools like Copilot/OpenCode. Knowledge of accessibility standards (a11y) and performance optimization techniques. Language Required for the role: Polish (Communicative) English (Communicative) Eligibility for this role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Full-Stack Software Engineer role building a high-scale e-commerce PPC platform with React microfrontends and Kotlin/Spring Boot services. The work spans real-time analytics dashboards, ML-driven recommendations, and event-driven campaign-data processing, with strong automated testing and DevOps practices. 🗂️ Requirements: Proven React expertise, TypeScript proficiency, CSS and HTML proficiency, State-management experience, Modern testing-framework experience, Hands-on Kotlin and Spring Boot experience, REST API and microservices experience, Commercial MongoDB and SQL experience, Cloud-environment experience, Familiarity with agentic coding assistants, English proficiency at B2 or higher 📃 Skills: React, TypeScript, CSS, HTML, Jest, Vitest, Playwright, Kotlin, SpringBoot, REST, MongoDB, SQL, GCP, GitHubCopilot, OpenCode 🏢 Description: Join a high-scale PPC advertising platform in the e-commerce sector, built entirely on microservices handling thousands of requests per second. Work on ML-driven recommendation engines, high-volume event data pipelines, and real-time merchant analytics dashboards. Expectations • Strong, proven expertise in React, TypeScript, CSS/HTML, state management, and modern testing frameworks: Jest, Vitest, and Playwright • Solid hands-on experience in Kotlin with Spring Boot, REST APIs, and microservices architecture • Commercial experience working with MongoDB, SQL databases, and cloud environments; GCP preferred • Familiarity with agentic coding tools and assistants, such as GitHub Copilot and OpenCode • Proactive, relational, highly engaged, open-minded approach and strong communication skills • Fluent English at B2+ level Welcome Skills • Experience with Microfrontends, Server-Side Rendering (SSR), and Accessibility standards (a11y / WCAG) • Exposure to Scala, Big Data engines such as Apache Spark, or search technologies such as ElasticSearch • Prior background in AdTech, PPC advertising, or large-scale e-commerce systems Key Tasks • Design, build, and maintain scalable React-based microfrontends for analytics dashboards and merchant tools, with a focus on Accessibility (a11y) and Server-Side Rendering (SSR) • Build high-performance backend microservices in Kotlin and Spring Boot to power real-time dashboards, benchmarks, and recommendation engines • Partner closely with Data Science teams to serve personalized recommendations and automated campaign insights • Participate in developing a distributed, event-driven cloud architecture for processing campaign data in real time • Maintain high engineering standards through automated testing, including unit, integration, and E2E testing via Jest, Vitest, and Playwright; code reviews; CI/CD; and DevOps practices

🏢 Summary: Fullstack Software Engineer (Kotlin + React) role in a data-driven advertising project within e-commerce, focused on building scalable microservices and modern web tools for campaign management. The position involves developing backend systems, APIs, and React-based dashboards, working with large data volumes and ML-powered recommendation systems. Remote full-time engagement with impact on solutions used by thousands of users. 🗂️ Requirements: Several years of experience as Fullstack Developer with strong backend focus, Strong knowledge of Kotlin, Strong knowledge of Spring Boot, Experience with microservices architecture, Experience with Google Cloud Platform, Experience with relational and non-relational databases, Strong knowledge of TypeScript, Strong knowledge of React, Experience with testing frameworks (Jest, Vitest or Playwright), Experience with large-scale data processing, Knowledge of Server-Side Rendering, Experience with AI-assisted development tools 📃 Skills: Kotlin, SpringBoot, Microservices, GCP, MongoDB, SQL, TypeScript, React, Jest, Vitest, Playwright, SSR, Scala, Copilot, AI, EventDriven, MachineLearning, REST, API 🏢 Description: Dla naszego klienta z branży e-commerce poszukujemy osoby na stanowisko Fullstack Software Engineer (Kotlin + React) do projektu z obszaru reklamy i danych. Dołączysz do zespołu rozwijającego nowoczesne narzędzia wspierające sprzedawców w zarządzaniu kampaniami reklamowymi i rozwijaniu ich biznesu. Projekt ma silny komponent data-driven i opiera się na przetwarzaniu dużych wolumenów danych oraz wykorzystaniu rozwiązań Machine Learning do budowy systemów rekomendacyjnych. To rola dla osoby, która dobrze odnajduje się w środowisku produktowym, lubi pracę przy skalowalnych systemach i chce mieć realny wpływ na rozwiązania wykorzystywane przez tysiące użytkowników. Lokalizacja: praca zdalna (1-2 razy na kwartał spotkanie w Warszawie lub Krakowie) Forma współpracy: full-time Start: 01.06.2026 Zaangażowanie: do końca 2026 (z możliwością przedłużenia) Zakres obowiązków Rozwój i utrzymanie systemów backendowych opartych o architekturę mikroserwisową Budowa i integracja rozwiązań wspierających systemy rekomendacyjne we współpracy z zespołami Data Science Projektowanie i rozwój wydajnych API zasilających narzędzia analityczne i dashboardy Praca z dużymi wolumenami danych w architekturze event-driven Rozwój warstwy frontendowej (React) - dashboardy i narzędzia dla użytkowników biznesowych Dbanie o jakość, wydajność i skalowalność tworzonych rozwiązań Oczekiwania Kilkuletnie doświadczenie w pracy na stanowisku Fullstack Developera , z wyraźnym naciskiem na rozwój backendu Bardzo dobra znajomość języka Kotlin oraz frameworka Spring Boot Doświadczenie w projektowaniu i rozwijaniu architektury mikroserwisowej Praktyczna znajomość środowisk chmurowych, w szczególności Google Cloud Platform (GCP) Doświadczenie w pracy z bazami danych - zarówno nierelacyjnymi (MongoDB), jak i relacyjnymi (SQL). Dobra znajomość TypeScript oraz biblioteki React w kontekście budowy nowoczesnych aplikacji webowych Znajomość narzędzi i frameworków testowych, takich jak Jest, Vitest lub Playwright Doświadczenie w pracy z narzędziami wspierającymi development, w tym rozwiązaniami typu Copilot lub innymi narzędziami opartymi o AI Znajomość języka angielskiego na poziomie minimum B2 , umożliwiająca swobodną pracę w środowisku technicznym. Znajomość podejścia Server-Side Rendering (SSR) Doświadczenie w projektach opartych o przetwarzanie dużych wolumenów danych Mile widziane: znajomość języka Scala Oferujemy Stałe wsparcie osobistego agenta , dbającego o Twoją ciągłość projektową, kontakt z klientem, niezbędne formalności, komfort pracy oraz rozwój, Consultant Development Program – doradztwo w planowaniu kariery w oparciu o najnowsze trendy i potrzeby rynku IT, obejmujące m.in . konsultacje z agentami i mentorami kariery , Dostęp do 7N Learning & Development – platformy rozwojowo-edukacyjnej z webinarami, biblioteką artykułów i raportów branżowych oraz regularnymi zaproszeniami na jednorazowe i cykliczne wydarzenia rozwojowe – techniczne, biznesowe oraz life-stylowe, Spektakularne eventy integracyjne , zarówno dla Ciebie (np. coroczny wyjazd Kick-Off , imprezy świąteczne czy sportowe Letnie Igrzyska), jak i dla Twoich bliskich (np. pikniki rodzinne, premiery filmowe), Rozwój zawodowy nie tylko podczas projektu – możesz zaangażować się w przekazywanie wiedzy innym w ramach oferty 7N Services kierowanej do klientów 7N, Relacje i dostęp do wiedzy najbardziej doświadczonych ekspertów IT na rynku – średni staż zawodowy naszego Konsultanta w Polsce to ponad 10 lat. Pakiet benefitów zaplanowany od A do Z , czyli dofinansowanie do opieki medycznej, ubezpieczenia na życie, karty sportowej dla Ciebie i Twoich bliskich, a także zniżki do sklepów w Polsce i za granicą O 7N Ciągłe poszukiwanie projektów, trudne negocjacje stawek, brak wsparcia w rozwoju – brzmi znajomo? W 7N zyskujesz nie tylko stabilność kontraktów, ale też zaangażowanie osobistego opiekuna dbającego o Twój komfort zawodowy i stały dostęp do inicjatyw rozwojowych. Naszym celem jest zapewnienie Ci stabilnej i komfortowej współpracy, która przyczyni się do sukcesu Twojego jako eksperta IT oraz naszych klientów. Budujemy trwałe relacje, bazując na skandynawskich wartościach i 30-letnim doświadczeniu w tworzeniu rozwiązań IT dla ponad 200 organizacji.

🏢 Summary: Fullstack Developer (Kotlin + React) role in an e-commerce project focused on building intelligent tools for advertisers, including recommendation systems and campaign automation features. The position involves backend development with ML integration, big data processing in cloud environments, and scalable microfrontend development. Remote work with occasional on-site meetings, 12-month engagement starting ASAP. 🗂️ Requirements: Very good knowledge of Kotlin, Experience with Spring Boot, Experience with microservices architecture, Practical experience with cloud ecosystem (preferred GCP), Knowledge of relational and non-relational databases, Commercial experience with TypeScript, Commercial experience with React, Proficiency in CSS, Proficiency in HTML, Knowledge of testing frameworks (Jest or Vitest or Playwright), English proficiency at minimum B2 level 📃 Skills: Kotlin, Spring, SpringBoot, Microservices, GCP, SQL, MongoDB, TypeScript, React, CSS, HTML, Jest, Vitest, Playwright, Agile, Scrum, BigData, API, Microfrontends, SSR, Accessibility, Scala 🏢 Description: Dla naszego klienta z branży e-commerce poszukujemy doświadczonego Fullstack Developera ze znajomością Kotlina i Reacta . Projekt polega na stworzeniu inteligentnych narzędzi wspomagających reklamodawców. Obejmuje rozwój systemów rekomendacji oraz integrację funkcji automatyzujących obsługę kampanii reklamowych, dzięki czemu sprzedawcy mogą łatwiej rozwijać swoją działalność. Model pracy: zdalnie (spotkania w Krakowie lub Warszawie 1-2 razy/kwartał) Start: ASAP Czas trwania: 12 mscy Zakres obowiązków Rozwój backendu i integracja ML: Projektowanie i wdrażanie wydajnych usług backendowych, które serwują spersonalizowane rekomendacje (bliska współpraca z zespołem Data Science) Przetwarzanie danych (Big Data): Rozbudowa rozproszonej architektury sterowanej zdarzeniami (event-driven), odpowiedzialnej za procesowanie dużych wolumenów danych w chmurze obliczeniowej przy użyciu systemów kolejkowych Integracja API: Tworzenie i optymalizacja wysokowydajnych interfejsów API na potrzeby dashboardów analitycznych oraz benchmarków rynkowych Tworzenie rozwiązań frontendowych: Rozwój skalowalnych mikrofrontendów w oparciu o bibliotekę React, z silnym naciskiem na wydajność oraz standardy dostępności Praca w metodyce Agile: Aktywny udział w ceremoniach Scrum, dbanie o jakość kodu (code review) oraz współdzielenie wiedzy wewnątrz zespołu Oczekiwania Bardzo dobra znajomość języka Kotlin oraz frameworka Spring Boot Doświadczenie w pracy z architekturą mikroserwisów Praktyczna znajomość ekosystemu chmurowego (preferowane GCP) Znajomość relacyjnych i nierealacyjnych baz danych (SQL, MongoDB) Otwartość na nowoczesne narzędzia AI wspierające programowanie (np. Copilot, OpenCode) Komercyjne doświadczenie w pracy z TypeScript oraz React Biegłość w CSS i HTML Znajomość frameworków testowych (np. Jest, Vitest, Playwright) Znajomość języka angielskiego na poziomie min. B2 Mile widziane: doświadczenie z architekturą Microfrontends; znajomość zagadnień związanych z Server-Side Rendering (SSR) oraz Accessibility; podstawowa znajomość lub komercyjne doświadczenie w Scala Oferujemy Stałe wsparcie osobistego agenta , dbającego o Twoją ciągłość projektową, kontakt z klientem, niezbędne formalności, komfort pracy oraz rozwój, Consultant Development Program – doradztwo w planowaniu kariery w oparciu o najnowsze trendy i potrzeby rynku IT, obejmujące m.in . konsultacje z agentami i mentorami kariery , Dostęp do 7N Learning & Development – platformy rozwojowo-edukacyjnej z webinarami, biblioteką artykułów i raportów branżowych oraz regularnymi zaproszeniami na jednorazowe i cykliczne wydarzenia rozwojowe – techniczne, biznesowe oraz life-stylowe, Spektakularne eventy integracyjne , zarówno dla Ciebie (np. coroczny wyjazd Kick-Off , imprezy świąteczne czy sportowe Letnie Igrzyska), jak i dla Twoich bliskich (np. pikniki rodzinne, premiery filmowe), Rozwój zawodowy nie tylko podczas projektu – możesz zaangażować się w przekazywanie wiedzy innym w ramach oferty 7N Services kierowanej do klientów 7N, Relacje i dostęp do wiedzy najbardziej doświadczonych ekspertów IT na rynku – średni staż zawodowy naszego Konsultanta w Polsce to ponad 10 lat. Pakiet benefitów zaplanowany od A do Z , czyli dofinansowanie do opieki medycznej, ubezpieczenia na życie, karty sportowej dla Ciebie i Twoich bliskich, a także zniżki do sklepów w Polsce i za granicą

🏢 Summary: Fullstack Developer (Kotlin + React) role focused on building and integrating internal tools that streamline technology teams’ operations within a large organization. The position involves backend and frontend development, API-based system integrations, and contributing to architecture and technical standards. The project aims to improve efficiency through self-service components and modern technology stack. 🗂️ Requirements: Minimum 3 years of experience with Kotlin, Strong knowledge of Spring Boot, Strong knowledge of React, Proficiency in JavaScript or TypeScript, Experience with Git version control, Knowledge of relational databases, Practical experience with PostgreSQL, Experience designing and integrating REST APIs, Availability for hybrid work in Warsaw (once a week in office) 📃 Skills: Kotlin, Spring, SpringBoot, React, JavaScript, TypeScript, Git, PostgreSQL, SQL, REST, API, npm 🏢 Description: Wspólnie z Partnerem z sektora ubezpieczeniowego poszukujemy osoby na stanowisko Fullstack Developer (Kotlin+React) do projektu, którego celem jest realne usprawnienie funkcjonowania dużej organizacji. Inicjatywa koncentruje się na rozwoju narzędzi wspierających pracę zespołów technologicznych oraz integracji systemów wykorzystywanych w zarządzaniu infrastrukturą, dzięki czemu zespoły technologiczne mogą działać szybciej i efektywniej. 💡 TWOJA ROLA Rozwój backendu oraz frontendowych komponentów z wykorzystaniem Kotlin , Spring Boot , React oraz JavaScript/TypeScript. Projektowanie i implementacja integracji między systemami i usługami w środowisku opartym o API. Współtworzenie architektury rozwiązań, standardów technologicznych oraz dobrych praktyk w zespole. Tworzenie i rozwój narzędzi oraz komponentów Self-Service wspierających zespoły technologiczne. 🔍 CZEGO OCZEKUJEMY OD CIEBIE Minimum 3 lata doświadczenia w programowaniu z wykorzystaniem Kotlin . Doświadczenie w pracy z systemem kontroli wersji Git oraz stosowanie dobrych praktyk programistycznych. Bardzo dobra znajomość Spring Boot , React , JavaScript lub TypeScript oraz praca z npm . Znajomość relacyjnych baz danych oraz praktyczne doświadczenie w pracy z PostgreSQL . Doświadczenie w projektowaniu i integracji systemów z wykorzystaniem REST API . Gotowość do pracy w trybie hybrydowym w Warszawie - raz w tygodniu biuro . ✨ OFERUJEMY Uczestnictwo w spotkaniach integracyjnych oraz meetupach technologicznych, umożliwiających dzielenie się wiedzą i doświadczeniem. Wsparcie dedykowanego opiekuna Connectis, który zawsze jest dostępny, by pomóc w sprawach związanych z projektem. Rozwój kariery i długofalową współpracę w firmie o ugruntowanej pozycji na rynku. 5000 PLN za polecenie znajomego do projektów. Dostęp do najnowszych technologii i narzędzi pracy. Szybki i zdalny proces. Dziękujemy za wszystkie zgłoszenia. Informujemy, że skontaktujemy się wyłącznie z wybranymi osobami.

🏢 Summary: Senior Fullstack Engineer role focused on building scalable enterprise applications using .NET and React in a hybrid Krakow-based environment. The position involves full software lifecycle ownership, UI improvements, DevOps automation, architecture contributions, and customer-facing solution delivery. 🗂️ Requirements: 7+ years of experience in .NET application development, Experience with React frontend development, Proficiency in C#, Experience with Web API development, Advanced SQL Server and T-SQL skills, Understanding of SDLC processes, Experience with DevOps practices, Fluent English, Legal right to work in the European Union 📃 Skills: .NET, React, C#, WebAPI, SQL, SQLServer, TSQL, DevOps, SDLC, Docker, Kubernetes 🏢 Description: Unleash innovation — shape the future of enterprise applications. Krakow-based opportunity with hybrid work model. As a Senior Fullstack Engineer – .NET and React Development , you will be working for our client, a leader in enterprise software solutions, dedicated to delivering robust, scalable, and innovative digital tools. Your expertise will drive the development of cutting-edge applications that empower businesses worldwide, supporting their digital transformation journeys. Your main responsibilities: Implement solutions following best Design Patterns to ensure maintainability and scalability Analyze requirements to fully understand solutions and recommend improvements for optimal performance Lead UI enhancements and improvements to boost user experience and application stability Actively participate in DevOps automation and improve the CI/CD lifecycle processes Manage changes through the entire service management lifecycle, ensuring seamless updates Contribute to software architecture design and technical decision-making Develop and prototype applications to validate concepts and designs Provide exceptional customer support by addressing and resolving issues promptly Communicate effectively with clients to understand needs and deliver tailored solutions You're ideal for this role if you have: A minimum of 7 years of professional experience in production application development within .NET ecosystems, including front-end (preferably React) and DevOps practices Proficiency in C# and Web API development, with a focus on scalable, secure backend services Strong hands-on experience with React, building dynamic, responsive web applications Advanced SQL skills, particularly with SQL Server, including T-SQL scripting, query optimization, and performance tuning Solid understanding of the SDLC, from requirement gathering to deployment and maintenance Exceptional problem-solving abilities and an eye for detail to ensure high-quality deliverables It is a strong plus if you have: (optional) Certifications in cloud or DevOps tools Experience with containerization (e.g., Docker, Kubernetes) Language Required for the role: Fluent English (written and spoken) Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior Fullstack Engineer role focused on developing scalable enterprise applications using .NET and React in a hybrid Krakow-based environment. The position involves full lifecycle development, UI enhancements, DevOps automation, architecture contributions, and customer-focused solution delivery. 🗂️ Requirements: 7+ years of experience in .NET application development, Experience with React frontend development, Proficiency in C#, Experience with Web API development, Advanced SQL Server and T-SQL skills, Understanding of SDLC processes, Experience with DevOps practices, Fluent English, Legal right to work in the European Union 📃 Skills: .NET, React, C#, WebAPI, SQL, SQLServer, T-SQL, DevOps, CI/CD, Docker, Kubernetes 🏢 Description: Unleash innovation — shape the future of enterprise applications. Krakow-based opportunity with hybrid work model. As a Senior Fullstack Engineer – .NET and React Development , you will be working for our client, a leader in enterprise software solutions, dedicated to delivering robust, scalable, and innovative digital tools. Your expertise will drive the development of cutting-edge applications that empower businesses worldwide, supporting their digital transformation journeys. Your main responsibilities: Implement solutions following best Design Patterns to ensure maintainability and scalability Analyze requirements to fully understand solutions and recommend improvements for optimal performance Lead UI enhancements and improvements to boost user experience and application stability Actively participate in DevOps automation and improve the CI/CD lifecycle processes Manage changes through the entire service management lifecycle, ensuring seamless updates Contribute to software architecture design and technical decision-making Develop and prototype applications to validate concepts and designs Provide exceptional customer support by addressing and resolving issues promptly Communicate effectively with clients to understand needs and deliver tailored solutions You're ideal for this role if you have: A minimum of 7 years of professional experience in production application development within .NET ecosystems, including front-end (preferably React) and DevOps practices Proficiency in C# and Web API development, with a focus on scalable, secure backend services Strong hands-on experience with React, building dynamic, responsive web applications Advanced SQL skills, particularly with SQL Server, including T-SQL scripting, query optimization, and performance tuning Solid understanding of the SDLC, from requirement gathering to deployment and maintenance Exceptional problem-solving abilities and an eye for detail to ensure high-quality deliverables It is a strong plus if you have: (optional) Certifications in cloud or DevOps tools Experience with containerization (e.g., Docker, Kubernetes) Language Required for the role: Fluent English (written and spoken) Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior Fullstack Engineer role focused on building and enhancing scalable enterprise applications using .NET and React within a hybrid Krakow-based setup. The position involves leading UI improvements, contributing to architecture and DevOps automation, and delivering high-quality, secure backend and frontend solutions. The engineer drives full SDLC activities, from design and development to deployment and support. 🗂️ Requirements: Minimum 7 years of professional experience in .NET production application development, Strong experience with React for frontend development, Proficiency in C# and Web API development, Advanced SQL Server skills including T-SQL and query optimization, Experience with DevOps practices and CI/CD processes, Solid understanding of SDLC, Fluent English, Legal right to work in the European Union 📃 Skills: .NET, C#, WebAPI, React, SQL, SQLServer, T-SQL, CI/CD, DevOps, Docker, Kubernetes 🏢 Description: Unleash innovation — shape the future of enterprise applications. Krakow-based opportunity with hybrid work model. As a Senior Fullstack Engineer – .NET and React Development , you will be working for our client, a leader in enterprise software solutions, dedicated to delivering robust, scalable, and innovative digital tools. Your expertise will drive the development of cutting-edge applications that empower businesses worldwide, supporting their digital transformation journeys. Your main responsibilities: Implement solutions following best Design Patterns to ensure maintainability and scalability Analyze requirements to fully understand solutions and recommend improvements for optimal performance Lead UI enhancements and improvements to boost user experience and application stability Actively participate in DevOps automation and improve the CI/CD lifecycle processes Manage changes through the entire service management lifecycle, ensuring seamless updates Contribute to software architecture design and technical decision-making Develop and prototype applications to validate concepts and designs Provide exceptional customer support by addressing and resolving issues promptly Communicate effectively with clients to understand needs and deliver tailored solutions You're ideal for this role if you have: A minimum of 7 years of professional experience in production application development within .NET ecosystems, including front-end (preferably React) and DevOps practices Proficiency in C# and Web API development, with a focus on scalable, secure backend services Strong hands-on experience with React, building dynamic, responsive web applications Advanced SQL skills, particularly with SQL Server, including T-SQL scripting, query optimization, and performance tuning Solid understanding of the SDLC, from requirement gathering to deployment and maintenance Exceptional problem-solving abilities and an eye for detail to ensure high-quality deliverables It is a strong plus if you have: (optional) Certifications in cloud or DevOps tools Experience with containerization (e.g., Docker, Kubernetes) Language Required for the role: Fluent English (written and spoken) Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior Fullstack Engineer role focused on building and enhancing scalable enterprise applications using .NET and React in a hybrid Krakow-based setup. The position involves leading UI improvements, contributing to architecture and DevOps automation, and delivering high-quality backend and frontend solutions. You will drive end-to-end development from design to deployment while ensuring performance, stability, and maintainability. 🗂️ Requirements: Minimum 7 years experience in .NET application development, Strong experience with React for frontend development, Proficiency in C# and Web API, Advanced SQL Server and T-SQL skills, Experience with CI/CD and DevOps practices, Understanding of SDLC, Experience with design patterns and software architecture, Fluent English, Legal right to work in EU 📃 Skills: .NET, C#, React, WebAPI, SQL, SQLServer, T-SQL, CI/CD, DevOps, SDLC, Docker, Kubernetes 🏢 Description: Unleash innovation — shape the future of enterprise applications. Krakow-based opportunity with hybrid work model. As a Senior Fullstack Engineer – .NET and React Development , you will be working for our client, a leader in enterprise software solutions, dedicated to delivering robust, scalable, and innovative digital tools. Your expertise will drive the development of cutting-edge applications that empower businesses worldwide, supporting their digital transformation journeys. Your main responsibilities: Implement solutions following best Design Patterns to ensure maintainability and scalability Analyze requirements to fully understand solutions and recommend improvements for optimal performance Lead UI enhancements and improvements to boost user experience and application stability Actively participate in DevOps automation and improve the CI/CD lifecycle processes Manage changes through the entire service management lifecycle, ensuring seamless updates Contribute to software architecture design and technical decision-making Develop and prototype applications to validate concepts and designs Provide exceptional customer support by addressing and resolving issues promptly Communicate effectively with clients to understand needs and deliver tailored solutions You're ideal for this role if you have: A minimum of 7 years of professional experience in production application development within .NET ecosystems, including front-end (preferably React) and DevOps practices Proficiency in C# and Web API development, with a focus on scalable, secure backend services Strong hands-on experience with React, building dynamic, responsive web applications Advanced SQL skills, particularly with SQL Server, including T-SQL scripting, query optimization, and performance tuning Solid understanding of the SDLC, from requirement gathering to deployment and maintenance Exceptional problem-solving abilities and an eye for detail to ensure high-quality deliverables It is a strong plus if you have: (optional) Certifications in cloud or DevOps tools Experience with containerization (e.g., Docker, Kubernetes) Language Required for the role: Fluent English (written and spoken) Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior Fullstack Engineer role focused on .NET and React development for enterprise-grade applications, driving scalable backend services and modern UI solutions. The position involves leading architectural decisions, enhancing CI/CD processes, and improving application performance and user experience. Candidates will contribute across the full SDLC while supporting digital transformation initiatives. 🗂️ Requirements: Minimum 7 years of professional experience in .NET production development, Strong experience with C# and Web API, Hands-on experience with React, Advanced SQL skills with SQL Server and T-SQL, Experience with DevOps practices and CI/CD processes, Solid understanding of SDLC, Fluent English (written and spoken), Legal right to work in the European Union 📃 Skills: .NET, C#, WebAPI, React, SQL, SQLServer, T-SQL, DevOps, CI/CD, Docker, Kubernetes 🏢 Description: Unleash innovation — shape the future of enterprise applications. Krakow-based opportunity with hybrid work model. As a Senior Fullstack Engineer – .NET and React Development , you will be working for our client, a leader in enterprise software solutions, dedicated to delivering robust, scalable, and innovative digital tools. Your expertise will drive the development of cutting-edge applications that empower businesses worldwide, supporting their digital transformation journeys. Your main responsibilities: Implement solutions following best Design Patterns to ensure maintainability and scalability Analyze requirements to fully understand solutions and recommend improvements for optimal performance Lead UI enhancements and improvements to boost user experience and application stability Actively participate in DevOps automation and improve the CI/CD lifecycle processes Manage changes through the entire service management lifecycle, ensuring seamless updates Contribute to software architecture design and technical decision-making Develop and prototype applications to validate concepts and designs Provide exceptional customer support by addressing and resolving issues promptly Communicate effectively with clients to understand needs and deliver tailored solutions You're ideal for this role if you have: A minimum of 7 years of professional experience in production application development within .NET ecosystems, including front-end (preferably React) and DevOps practices Proficiency in C# and Web API development, with a focus on scalable, secure backend services Strong hands-on experience with React, building dynamic, responsive web applications Advanced SQL skills, particularly with SQL Server, including T-SQL scripting, query optimization, and performance tuning Solid understanding of the SDLC, from requirement gathering to deployment and maintenance Exceptional problem-solving abilities and an eye for detail to ensure high-quality deliverables It is a strong plus if you have: (optional) Certifications in cloud or DevOps tools Experience with containerization (e.g., Docker, Kubernetes) Language Required for the role: Fluent English (written and spoken) 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.