Senior Fullstack Developer

🏢 Summary: Senior Fullstack Developer role for a greenfield project management module, building React front ends with C#/.NET microservices. The position covers end-to-end delivery, automated testing, Azure DevOps CI/CD, and deployments to Kubernetes in Azure, with 100% remote work available. 🗂️ Requirements: React experience, C# and .NET development experience, Microservices architecture knowledge, Docker and Kubernetes experience in Azure, Azure DevOps workflow experience, CI/CD execution experience, Automated unit and integration testing practice, Ability to independently own complex development tasks, Fluent English, Residence in Poland or eligibility to work in Poland 📃 Skills: React, C#, .NET, Microservices, Docker, Kubernetes, Azure, AzureDevOps, CI/CD, GitHubCopilot, Testing 🏢 Description: We are the part of an international organization listed on Nasdaq Stockholm, operating in 11 countries. In Poland, we work with full autonomy. We independently choose our technologies, processes, and ways of working while maintaining the highest professional standards. We deliver a wide range of IT projects in Poland and internationally, across multiple domains and technologies. This allows our consultants to develop their competencies and gain experience aligned with their professional ambitions. Our collaboration is built around the CARE philosophy. For us, it means responsible project matching, transparent cooperation, and a long-term approach to professional growth. Join us as Senior Fullstack Developer. Grow in an environment that cares about your development as much as you do. Your responsibilities Design, develop, and maintain fullstack features with a focus on front-end web application development using React coupled with C# and .NET microservices. Build automated intelligent forms, dynamic UI workflows, and CMS -connected data pipelines for a greenfield project management module. Take ownership of the end-to-end development cycle, including writing automated unit and integration tests, deployment, and monitoring. Collaborate with the team utilizing AI-assisted coding tools like GitHub Copilot to maintain code quality and accelerate delivery. Interact directly with Azure DevOps CI/CD pipelines and push code into a cloud-hosted Kubernetes cluster in Azure . Requirements Experience in React , with the ability to take ownership of complex frontend tasks. Knowledge in Tailwind CSS or UI libraries like shadcn/ui is an advantage. Experience in C# and .NET development, including practical knowledge in microservices architecture. Experience with modern cloud deployment environments, specifically Docker and Kubernetes in Azure . Experience working with Azure DevOps workflows, including pull requests, code reviews, and basic CI/CD execution. Habit of writing automated tests for your own code. Independent, self-starter mindset with the ability to drive tasks independently and navigate established architectures. Fluent English language skills. You need to live in Poland and/or be eligible to work here. What we offer 100% remote work Work in a Scandinavian culture built on logic and dialogue. Health and sports benefits tailored to your needs. Speed Coaching – short sessions that provide new perspectives and solutions. Sports training, an internal team, and opportunities to take part in competitions. Team events and development-focused meetups.

🏢 Summary: Senior Fullstack Developer role for building a greenfield project-management module, with React front-end development and C#/.NET microservices. The position covers end-to-end delivery, including automated testing, CI/CD deployment, and monitoring in Azure Kubernetes environments. It offers 100% remote work for candidates based in or eligible to work in Poland. 🗂️ Requirements: React experience, C# and .NET development experience, Practical microservices architecture knowledge, Docker and Kubernetes deployment experience in Azure, Azure DevOps workflow experience, Automated unit and integration testing practice, Ability to independently own and deliver complex tasks, Fluent English, Residence in Poland or eligibility to work in Poland 📃 Skills: React, C#, .NET, Microservices, Docker, Kubernetes, Azure, AzureDevOps, CI/CD, GitHub, Copilot, Testing 🏢 Description: e are part of an international organization listed on Nasdaq Stockholm, operating in 11 countries. In Poland, we work with full autonomy. We independently choose our technologies, processes, and ways of working while maintaining the highest professional standards. We deliver a wide range of IT projects in Poland and internationally, across multiple domains and technologies. This allows our consultants to develop their competencies and gain experience aligned with their professional ambitions. Our collaboration is built around the CARE philosophy. For us, it means responsible project matching, transparent cooperation, and a long-term approach to professional growth. Join us as Senior Fullstack Developer. Grow in an environment that cares about your development as much as you do. Your responsibilities Design, develop, and maintain fullstack features with a focus on front-end web application development using React coupled with C# and .NET microservices. Build automated intelligent forms, dynamic UI workflows, and CMS -connected data pipelines for a greenfield project management module. Take ownership of the end-to-end development cycle, including writing automated unit and integration tests, deployment, and monitoring. Collaborate with the team utilizing AI-assisted coding tools like GitHub Copilot to maintain code quality and accelerate delivery. Interact directly with Azure DevOps CI/CD pipelines and push code into a cloud-hosted Kubernetes cluster in Azure . Requirements Experience in React , with the ability to take ownership of complex frontend tasks. Knowledge in Tailwind CSS or UI libraries like shadcn/ui is an advantage. Experience in C# and .NET development, including practical knowledge in microservices architecture. Experience with modern cloud deployment environments, specifically Docker and Kubernetes in Azure . Experience working with Azure DevOps workflows, including pull requests, code reviews, and basic CI/CD execution. Habit of writing automated tests for your own code. Independent, self-starter mindset with the ability to drive tasks independently and navigate established architectures. Fluent English language skills. You need to live in Poland and/or be eligible to work here. What we offer • 100% remote work • Work in a Scandinavian culture built on logic and dialogue. • Health and sports benefits tailored to your needs. • Speed Coaching – short sessions that provide new perspectives and solutions. • Sports training, an internal team, and opportunities to take part in competitions. • Team events and development-focused meetups.

🏢 Summary: Middle/Senior Full Stack Developer role focused on customer-growth features for a large-scale international platform, including onboarding, subscriptions, pricing, trials, and payments. The position emphasizes Node.js back-end development, React front-end work, cloud scalability, and cross-functional product delivery. 🗂️ Requirements: 4+ years of commercial software development experience, Strong Node.js and TypeScript back-end experience, Good React and TypeScript front-end skills, Product-oriented development experience, Cloud infrastructure and DevOps knowledge, AWS experience: EC2, ECS, RDS, S3, MySQL and Redis experience, CI/CD and infrastructure automation familiarity, Scalable system design and engineering best-practice knowledge, Upper-Intermediate English or higher 📃 Skills: Node.js, TypeScript, React, AWS, EC2, ECS, RDS, S3, MySQL, Redis, CI/CD, DevOps 🏢 Description: Join a product-focused engineering team working on customer growth initiatives that directly influence business scalability and user experience. You will contribute to the evolution of onboarding, subscription plans, pricing strategies, and payment experiences for a large-scale international platform. We are looking for a Middle/Senior Full Stack Developer with strong Back-end expertise in Node.js and solid Front-end skills in React. You will collaborate closely with Product Managers, Designers, QA Engineers, and other developers in a highly collaborative environment focused on innovation and continuous improvement. We at Sigma Software value engineering excellence, ownership, and knowledge sharing. This is an opportunity to work with modern cloud technologies, influence product decisions, and contribute to impactful solutions used by customers worldwide. Customer Our Customer is a product-focused international company developing a large-scale digital platform with a strong emphasis on customer growth and user experience optimization. The organization continuously improves pricing models, onboarding journeys, payment flows, and trial experiences to increase customer engagement and business scalability. The engineering culture promotes innovation, ownership, and close collaboration across product, design, and engineering teams. Project The project focuses on building and improving customer-facing product experiences related to onboarding, subscription management, pricing strategy, trial conversion, and payment flows. The team works in a modern cloud-based environment with high engineering standards and a strong product mindset. You will participate in feature delivery, scalability improvements, architecture discussions, and engineering initiatives aimed at increasing development efficiency and enhancing customer experience. Requirements 4+ years of commercial software development experience Strong Back-end development experience with Node.js and TypeScript Good Front-end development skills with React and TypeScript Experience working in product-oriented environments Knowledge of cloud infrastructure and DevOps practices Experience with AWS services such as EC2, ECS, RDS, and S3 Experience with relational databases and caching solutions including MySQL and Redis Familiarity with CI/CD tools and infrastructure automation practices Understanding of software engineering best practices and scalable system design Strong communication and collaboration skills Upper-Intermediate or higher English level Will be a plus Experience with Terraform, Ansible, SonarQube, GitLab CI/CD, and ELK stack Experience working with subscription-based or SaaS products Knowledge of experimentation platforms, pricing systems, or payment integrations Experience contributing to product growth initiatives and customer journey optimization Personal Profile Proactive and collaborative team player Product-minded engineer with strong ownership mentality Passionate about learning and continuous improvement Comfortable working in cross-functional international teams Open to innovation and process improvements Responsibilities Design, develop, and maintain scalable Full Stack solutions using Node.js, TypeScript, and React Collaborate closely with Product Managers, Designers, QA Engineers, and developers to deliver high-quality product features Contribute to onboarding, payment, trial, and pricing experience improvements Participate in technical discussions, architectural decisions, and solution design activities Improve system reliability, scalability, and performance within a cloud-based infrastructure Write clean, maintainable, and well-tested code following engineering best practices Participate in code reviews and knowledge-sharing initiatives Contribute to CI/CD improvements and engineering process optimization Support cross-team initiatives focused on developer experience and operational efficiency

🏢 Summary: Fullstack Engineer role focused on building and scaling SaaS products, internal tools, AI-driven workflows, and third-party integrations. The position combines React/Next.js frontend work with Node.js/NestJS backend development, async processing, and production LLM automation. 🗂️ Requirements: 2.5+ years of professional full-stack experience, React.js, Next.js, Node.js, External API integrations, AI development tools, SQL, PostgreSQL, Async processing, Queues, Background jobs, Reliable-system design, English fluency, Polish fluency 📃 Skills: React.js, Next.js, Node.js, NestJS, OpenAI, Claude, Cursor, SQL, PostgreSQL, REST, WebSockets, LavinMQ, BullMQ, Kafka, GitLab, AWS, Fly.io, Golang, Elixir, Rust, BigQuery, ClickHouse, gRPC 🏢 Description: At Web Impact, we’re more than just an email marketing agency and digital solutions provider. We build cutting-edge, socially impactful products that redefine how businesses operate in the digital world. We’re looking for a Fullstack Engineer who enjoys building complex systems, integrating external services, and leveraging AI tools to speed up development and automate workflows. If you’re excited about combining modern frontend development with AI-driven workflows and automation tools like Claude Code, Cursor, and LLM frameworks , this one is for you. What You’ll Do Develop and contribute to end-to-end features across SaaS products and internal tools, collaborating with senior engineers on architecture and implementation decisions. Build modern, high-performance frontends using Next.js and React.js Develop scalable backend services using Node.js / NestJS Design and integrate APIs (REST, WebSockets, external services) Build and maintain automation workflows and background jobs Work with async systems, queues, and event-driven architectures Integrate third-party services with real-world constraints (rate limits, retries, auth flows) Use AI tools to improve development speed, testing, and automation Collaborate directly with product, data, and leadership teams Build MVPs, proof-of-concepts, and new product ideas from scratch Rapidly validate business ideas through experimentation and iteration Help evolve successful prototypes into production-ready systems AI & Automation This role includes working with modern AI tooling and automation systems, with a strong focus on speed, ownership, and execution : Using tools like Claude Code, Cursor, and OpenAI SDK in daily development Building AI-driven workflows and integrations quickly and iteratively Automating repetitive processes (data handling, content, integrations) Applying LLMs in production with a pragmatic, results-first approach Taking ownership of problems - from idea to production Shipping fast, testing in real conditions, and iterating based on outcomes Being accountable for delivery - not just writing code, but making things work end-to-end Prioritizing execution over perfection - speed is key What We’re Looking For 2,5+ years of professional full-stack experience Strong frontend skills in React.js / Next.js Backend experience with Node.js (NestJS preferred) Experience integrating external APIs (auth, pagination, retries, rate limits) Hands-on experience with modern AI tools (OpenAI, Claude, Cursor, etc.) Good SQL skills (PostgreSQL preferred) Experience working with async processing, queues, and background jobs Understanding of building reliable systems (error handling, retries, observability) Strong communication skills and ability to work cross-functionally Fluent in English and Polish Nice to Have Experience with Rust (async, Tokio, Axum) Experience with Elixir (Phoenix LiveView, GenServer) Understanding of distributed systems and architectures Experience with multi-region deployments and geo-distributed infrastructure Experience building systems with high parallelism (a large number of workers processing jobs concurrently) Familiarity with distributed databases and data consistency trade-offs Experience with multi-tenancy architectures (tenant isolation, scaling strategies) Experience working with high-throughput event pipelines Our Tech Stack Frontend: Next.js, React.js Backend: Node.js, NestJS, Golang, Elixir, Rust Data: PostgreSQL, BigQuery, ClickHouse Infra: AWS, Fly.io , Google Cloud, DigitalOcean Queues & Workers: LavinMQ, BullMQ, Kafka CI/CD: GitLab CI AI/ML & Automation: Proprietary GenAI models, OpenAI, Claude, internal tooling Integrations: REST, gRPC, WebSockets, external APIs with rate limits Why Join Us? Work on high-scale SaaS systems processing hundreds of millions of events daily , with real-time pipelines and data-heavy workloads. Ownership from day one - influence architecture, technology choices, and product direction. Collaborate with world-class engineers, AI specialists, and PMs. Innovation-first culture - explore cutting-edge frameworks and architectures. Fast execution, minimal bureaucracy, no unnecessary meetings Opportunity to work with modern AI tooling in production Competitive senior-level compensation and career growth. Social impact - contribute to automation products that empower businesses and communities. Our Streamlined Hiring Process Initial call Technical deep dive with our team Decision

🏢 Summary: Oferta dotyczy realizacji projektów jako Senior Fullstack Developer, obejmujących rozwój, utrzymanie i projektowanie architektury aplikacji webowej w .NET i React. Praca jest głównie zdalna, z okresowymi spotkaniami koordynacyjnymi w Gdańsku lub Warszawie, w modelu B2B rozliczanym etapowo. 🗂️ Requirements: Minimum 5 lat doświadczenia w .NET, Minimum 3 lata doświadczenia w React, Bardzo dobra znajomość C# i platformy .NET, Znajomość React 18+, Znajomość DDD, Clean Code i SOLID, Znajomość wzorców architektonicznych i komunikacji asynchronicznej, Znajomość T-SQL i SQL Server Management Studio, Znajomość Visual Studio, Język angielski minimum B2, Biegła znajomość języka polskiego, Gotowość do spotkań w Gdańsku lub Warszawie około raz w tygodniu 📃 Skills: C#, .NET, React, T-SQL, SQLServer, SSMS, VisualStudio, DDD, SOLID, Scrum 🏢 Description: Wspólnie z naszym Partnerem Biznesowym poszukujemy doświadczonego specjalisty do realizacji projektów jako Senior Fullstack Developer (.NET + React). Projekt zakłada rozwój i utrzymanie aplikacji webowej opartej o technologie .NET oraz React, w tym pracę z istniejącym kodem oraz współtworzenie architektury nowych rozwiązań. 💡 ZAKRES USŁUG - Projektowanie i wytwarzanie oprogramowania w języku C# zgodnie z dostarczoną dokumentacją. - Implementacja warstwy frontendowej aplikacji w technologii React (18+). - Analiza oraz rozwój istniejącego kodu, w tym komponentów legacy. - Opracowywanie architektury rozwiązań technologicznych. - Debugowanie, profilowanie oraz analiza wydajności realizowanych rozwiązań. - Bieżąca współpraca z interesariuszami projektu (testerami, analitykami, Product Ownerem) w ramach zwinnego podejścia do realizacji usług (Scrum). 🔍 WYMAGANE KOMPETENCJE - Min. 5 lat doświadczenia w wytwarzaniu aplikacji w technologii .NET. - Min. 3 lata doświadczenia w wytwarzaniu aplikacji w React. - Bardzo dobra znajomość języka C# (.NET Framework, .NET Standard, .NET Core, .NET). - Znajomość React w wersji 18 i nowszych. - Znajomość zasad DDD, Clean Code oraz SOLID. - Znajomość wzorców architektonicznych oraz komunikacji asynchronicznej. - Znajomość TSQL oraz SQL Server Management Studio. - Znajomość środowiska Visual Studio. - Znajomość języka angielskiego w mowie i piśmie na poziomie min. B2 oraz biegła znajomość języka polskiego. - Zdolność analitycznego myślenia i swoboda w pracy z dokumentacją techniczną. - Samodzielna organizacja pracy oraz dbałość o jakość i terminowość realizowanych usług. Mile widziane: - Doświadczenie w budowaniu widoków dla aplikacji mobilnych. - Doświadczenie w budowaniu aplikacji dla sektora finansowego. - Doświadczenie w automatyzacji testów (np. Postman, Playwright). - Znajomość standardu WCAG. - Wykształcenie wyższe kierunkowe (informatyczne). TRYB WSPÓŁPRACY Gotowość do spotkań koordynacyjnych w Gdańsku lub Warszawie (orientacyjnie 1x w tygodniu, z możliwością zwiększenia częstotliwości w przyszłości). Pozostały zakres usług realizowany zdalnie. ✨ OFERUJEMY - Nowy sposób na aplikowanie z AI Rekruterem (AIR) – w trakcie procesu możesz porozmawiać z wirtualnym rekruterem 24/7, bez czekania na telefon. Finalną decyzję zawsze podejmuje Opiekun Projektu. - Współpracę w modelu projektowym, z rozliczeniem opartym na etapach i protokołach odbioru poszczególnych deliverables. - Wsparcie po stronie Connectis w sprawach administracyjnych i rozliczeniowych związanych ze współpracą. - Uczestnictwo w wydarzeniach branżowych oraz meetupach technologicznych. - 5 000 PLN za polecenie znajomych do naszych projektów. - Elastyczną formę współpracy B2B. - Szybki i zdalny proces. Dziękujemy za wszystkie zgłoszenia. Pragniemy poinformować, że skontaktujemy się z wybranymi osobami.

🏢 Summary: Oferta dotyczy rozwoju backendu platformy telemetrycznej opartej na .NET Core i Azure Cloud, przetwarzającej dane flotowe w czasie rzeczywistym. Rola obejmuje tworzenie usług chmurowych i integracji IoT/API, rozwój API, wpływ na architekturę oraz usuwanie błędów, z codziennym wykorzystaniem narzędzi AI. 🗂️ Requirements: Minimum 2 lata komercyjnego doświadczenia w środowisku .NET, Efektywna praca z Claude Code, Cursor i GitHub Copilot, Umiejętność oceny i poprawy kodu generowanego przez AI, Język angielski na poziomie B2 📃 Skills: .NET, C#, Claude, Cursor, Copilot, Azure, TCP/IP, IoT, API 🏢 Description: W związku z dynamicznym rozwojem naszej firmy poszukujemy osoby na stanowisko Backend Developer (.NET/C#) with AI Mindset , dla której narzędzia AI (Claude Code, Cursor, Copilot) są naturalnym elementem codziennej pracy, a nie dodatkiem. Projekt dotyczy prężnie rozwijającej się platformy telemetrycznej , opartej w pełni o .NET Core oraz chmurę Azure Cloud . 🏗️ NAD CZYM PRACUJEMY Nasza platforma pokazuje operatorom flot pełny obraz tego, co dzieje się z ich pojazdami - na żywo i z dowolnego momentu w przeszłości. Brzmi prosto. W praktyce oznacza to strumień danych przychodzący bez przerwy, interfejs mapowy, który musi zostać płynny przy dużej liczbie obiektów, odtwarzanie wideo zsynchronizowane z resztą widoku i aplikację działającą w kilkunastu językach dla organizacji o złożonej strukturze. Druga strona produktu to konfiguracja i zgodność. Setki ustawień na poziomie organizacji, pojazdu, urządzenia i użytkownika, rozbudowany system ról i uprawnień, ślad audytowy każdej zmiany. Projektowanie formularzy, tabel i przepływów konfiguracyjnych to u nas realna praca inżynierska, a nie dodatek. To dojrzały produkt w aktywnym rozwoju. Nie zaczynasz od pustego repo, ale nie wchodzisz też w zamrożony legacy. ⚙️ PLATFORMA POZWOLI CI POZNAĆ Video streaming · Analizę video (AI) · Komunikację TCP/IP (IoT) · Big data · Azure Cloud 🛠️ GŁÓWNE ZADANIA • Tworzenie nowych serwisów procesujących dane w chmurze • Tworzenie integracji z usługami zewnętrznymi (urządzenia IoT / API) • Rozwój platformy po stronie API • Wpływ na architekturę systemu • Bug fixing ✅ WYMAGANIA • Efektywna praca z narzędziami AI ( Claude Code, Cursor, GitHub Copilot ) jako naturalny element workflow - rozumiesz architekturę na tyle, by ocenić i poprawić to, co generuje model • Przynajmniej 2 lata doświadczenia komercyjnego w środowisku .NET • Znajomość języka angielskiego na poziomie B2 (zespół międzynarodowy) 💡 MILE WIDZIANE • Znajomość Git • Znajomość Microsoft Azure • Doświadczenie z tworzeniem i użytkowaniem lokalnych modeli AI • Umiejętność automatyzacji procesów (np. CI/CD, automatyzacja zadań/skryptów) 📩 Chcesz dołączyć do zespołu? Wyślij swoje CV - czekamy na Ciebie!