Senior Fullstack Engineer – React and Kotlin Specialists

🏢 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.

🏢 Summary: Senior Fullstack Engineer role focused on building and enhancing a .NET and React-based analytics platform within a financial institution, driving DevOps automation and data-driven transformation. The position involves designing scalable backend services, leading UI improvements, and optimizing CI/CD processes in a hybrid work model. You will contribute to architecture, deployment lifecycle, and high-performance web application development. 🗂️ Requirements: Minimum 7 years of experience in .NET application development, Strong proficiency in C# and Web API, Hands-on experience with React, Experience with CI/CD processes, Experience with DevOps activities, Strong SQL Server and T-SQL expertise, Knowledge of SDLC, Fluent English, Legal right to work in the EU 📃 Skills: .NET, C#, WebAPI, React, SQL, T-SQL, SQLServer, CI/CD, DevOps, SDLC, Docker, Kubernetes 🏢 Description: Unleash innovation at scale — shape the future of analytics and DevOps excellence! Krakow-based opportunity with a hybrid work model (2 days per week in the office). As a Senior Fullstack Engineer – .NET and React Analytics Platform , you will be working for our client, a leading financial institution committed to transforming DevOps practices worldwide through cutting-edge data and analytics products. You’ll contribute to developing critical insights that influence strategic decisions and drive technological evolution in a fast-paced environment. Join a team dedicated to pushing the boundaries of data-driven transformation and career growth! Your main responsibilities: Design and implement solutions following industry best practices and proven design patterns. Analyze requirements thoroughly to recommend improvements and ensure optimal architecture. Lead UI enhancements to boost user experience and application stability. Be actively involved in DevOps automation and enhancing the CI/CD lifecycle. Manage changes through the entire service management lifecycle, ensuring robust deployment processes. Participate in software architecture design and develop application prototypes for concept validation. Provide outstanding customer support by addressing issues promptly and effectively. Collaborate cross-functionally to deliver high-quality technical solutions. You're ideal for this role if you have: At least 7 years of professional experience in application development within the .NET ecosystem, including front-end skills (preferably React) and DevOps activities. Strong proficiency in C# and Web API development, with a focus on scalable, secure backend services. Hands-on experience with React for building dynamic, high-performance web applications. Solid SQL Server expertise, including advanced T-SQL scripting, query optimization, and performance tuning. Proven experience with continuous integration, continuous delivery processes. Familiarity with the Software Development Life Cycle (SDLC): requirements gathering, design, testing, deployment, and maintenance. Exceptional problem-solving skills, keen attention to detail, and ability to troubleshoot in high-pressure environments. It is a strong plus if you have: (optional) Certifications in cloud platforms or DevOps tools. Experience with containerization and orchestration (Docker, Kubernetes). Language Required for the role: Fluent English (both spoken and written). Eligibility to work in Europe: Only candidates with an existing legal right to work in the European Union will be considered for this role. We offer you: ITDS Business Consultants is involved in various, innovative, and professional IT projects for international companies in the financial industry in Europe. We offer an environment for professional, ambitious, and driven people. The offer includes: Stable and long-term cooperation with very good conditions Enhance your skills and develop your expertise in the financial industry Work on the most strategic projects available in the market Define your career roadmap and develop yourself in the best and fastest possible way by delivering strategic projects for different clients of ITDS over several years Participation in Social Events, training, and work in an international environment Access to an attractive Medical Package Access to Multisport Program #GETREADY Internal job ID #8667 You can report violations in accordance with ITDS’s Whistleblower Procedure available here .

🏢 Summary: Senior Full Stack Developer role in a hybrid model (Kraków) focused on building and maintaining scalable, mission-critical financial applications. The position involves end-to-end development, from analysis to deployment and support, using Java, React, and SQL. You will contribute to high-quality full-stack solutions while ensuring performance, stability, and adherence to best practices. 🗂️ Requirements: Minimum 5 years of full-stack development experience, Proficiency in Java, Proficiency in SQL, Proficiency in React, Working knowledge of UNIX environments, Understanding of HTTP APIs and RESTful services, Experience with end-to-end software development lifecycle, Fluent English, Legal right to work in the European Union 📃 Skills: Java, React, SQL, Kotlin, UNIX, HTTP, REST, DevOps 🏢 Description: Unleash Innovation — Drive Impact as a Senior Full Stack Developer in Kraków! Kraków-based opportunity with hybrid work model (up to 3 days remote). As a Senior Full Stack Developer , you will be working for our client, a leader in Global Markets Technology, focused on delivering robust, scalable solutions that empower financial services worldwide. Join a dynamic team where your expertise will shape mission-critical applications, enhance operational efficiency, and foster digital transformation. Your main responsibilities: Collaborate within a dedicated team of 4–6 developers, taking ownership of all development phases from analysis to deployment and support. Break down business requirements into user stories and deliver iterative enhancements to production. Design, develop, and optimize full-stack solutions using Java, React, and SQL, ensuring high-quality code and adherence to best practices. Identify and address technical debt, balancing new features with system stability and performance. Participate in pair programming and code reviews to foster knowledge sharing and code excellence. Support existing applications post-deployment, ensuring continuous functionality and performance improvements. Follow technology guidelines and constraints, ensuring solutions are scalable, maintainable, and aligned with project standards. You're ideal for this role if you have: At least 5 years of professional experience in full-stack development or related fields. Strong proficiency in Java, SQL, and React; familiarity with Kotlin is a plus. Working knowledge of UNIX environments. Good understanding of HTTP APIs, particularly RESTful services. Demonstrated willingness to learn new programming languages and frameworks. Excellent communication skills in English. It is a strong plus if you have: Experience with DevOps practices or familiarity with other programming languages. Relevant certifications or training related to full-stack development. Language Required for the role: Fluent English (verbal and written). Eligibility to work in 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.