Senior Full-Stack Developer (React Native & Node.js) | Short-Term B2B Freelance

🏢 Summary: Remote Fullstack Developer role with a frontend-first focus, leading the design and scaling of Vue 3 applications while contributing to a Python/FastAPI backend. The position involves owning web architecture, ensuring secure and scalable integrations, and driving CI/CD-based cloud deployments. You will deliver end-to-end solutions from frontend strategy to production deployment. 🗂️ Requirements: Minimum 5 years of professional web development experience, Strong proficiency in TypeScript, Deep expertise in Vue 3 (Composition API), Commercial experience with Python and FastAPI, Ability to design web application architectures, Knowledge of SOLID principles and design patterns, Experience with PostgreSQL, DynamoDB, and Redis, Experience with cloud platforms (AWS, Azure, or GCP), Experience implementing CI/CD pipelines, Experience with TDD, unit testing, and debugging, Proficiency with Git and version control systems 📃 Skills: TypeScript, Vue, JavaScript, Python, FastAPI, PostgreSQL, DynamoDB, Redis, AWS, Azure, GCP, CI/CD, TDD, Git, SOLID 🏢 Description: Hi there! We are STX Next, a global IT consulting company specializing in customer-focused software services. Join a group of 500 professionals dedicated to helping customers build outstanding products. Leveraging the latest advancements in the field, and a passion for innovation, we're shaping the future of technology one project at a time. Are you the NEXT one? Type of contract A B2B contract for your flexibility and competitive compensation package Location A remote work model encouraging work-life balance. Job description We are looking for a talented Fullstack Developer with a frontend-first mindset and deep expertise in Vue.js . While this role involves working with a Python/FastAPI backend, your primary impact will be in designing and scaling our frontend architecture. The ideal candidate is a Vue specialist who is also comfortable building and maintaining the APIs that power their UI. Responsibilities Lead the frontend strategy: Design and develop sophisticated, highly interactive user interfaces using Vue 3 . Fullstack development: Build and maintain scalable backend services using Python and FastAPI . Architectural design: Take ownership of web application architectures, ensuring seamless integration between the UI and data layers. Clean code & standards: Write clean, maintainable, and modular code, prioritizing frontend performance and state management. Security & Protection: Implement robust security measures and data protection across the entire stack. DevOps & Deployment: Design, implement, and maintain automated builds and deployments (CI/CD). Mentorship: Lead code reviews and share knowledge on modern frontend trends and best practices with the wider team. End-to-end delivery: From configuring development environments to cloud deployment, you will drive features from concept to production. Requirements Strong Frontend Foundation: Deep proficiency in TypeScript and Vue 3 (Composition API). Fullstack Experience: A minimum of 5 years of professional experience in web development, with significant time spent building applications with Python (FastAPI) . Architecture & Design: Proven ability to design web application architectures and implement design patterns (SOLID). Data Management: Strong understanding of PostgreSQL , DynamoDB , and Redis . Cloud & DevOps: Experience leading deployments in the cloud ( AWS, Azure, or GCP ) and implementing CI/CD pipelines. Quality First: Extensive experience with TDD , unit testing, and debugging complex systems. Tools: Mastery of Git and version control systems. Language: Proficiency in English and Polish (B2/C1 level). Soft Skills: A collaborative, team-oriented mindset and experience working in Agile environments. Nice to Have: Advanced state management and data fetching: Pinia and TanstackQuery . Experience with Shopify Extensions . Familiarity with RabbitMQ for asynchronous processing. Hands-on experience with containerized applications and microservices. Exposure to Vanilla React . Benefits Remote-First Flexibility Work from where you feel most productive. We offer a remote-first environment with the freedom to set your own schedule in coordination with your team. Whether you need a midday break or a specific routine, we trust you to manage your time and deliver results while maintaining your personal well-being. Reimbursed private medical care (Medicover) and Multisport We care about the health and well-being of our colleagues. Choose a sports card and dedicated medical care for yourself and your relatives. Leader’s support Work with true enthusiasts and professionals who will support you along the way. You can count on leaders and experts who are willing to share their knowledge so that you too can join their ranks someday. Technology focus Python and JavaScript are not our only strengths, we are also very good at React Native, IoT, Machine Learning, .Net, DevOps and Blockchain. Growth review Junior, Regular or Senior? Every year we have a chance to discuss acquired skills and prepare a development plan for upcoming months. Events Attend exciting internal webinars, celebrate special days with us, and join us at conferences and meetups as a listener or speaker! Workation Team trips where you have a chance as a team not only to work together, but also integrate f2f.

🏢 Summary: Fullstack Developer role focused on building and scaling IoT management systems, e-commerce platforms, and AI-based modules using Node.js and React. The position involves end-to-end software development in an international Agile team, covering architecture, implementation, deployment, and maintenance. The role requires hybrid work from Warsaw and active contribution to high-quality, cloud-based web solutions. 🗂️ Requirements: 3-5 years of commercial fullstack development experience, Proficiency in Node.js, Proficiency in React.js, Strong knowledge of TypeScript, Experience with Next.js, Experience with Express, Practical experience with AWS services (EC2, Lambda, S3, SQS), Ability to design and develop APIs, Experience with MongoDB, Proficiency with Git, Knowledge of CI/CD processes, Good command of English 📃 Skills: Node.js, React.js, TypeScript, Next.js, Express, AWS, EC2, Lambda, S3, SQS, MongoDB, Git, CI/CD, Agile, SCRUM 🏢 Description: Dla naszego klienta poszukujemy kandydatów na stanowisko: Fullstack Developer (Node.js, React) Projekt: 🚀 Rozwój innowacyjnych systemów z obszaru IoT do zarządzania urządzeniami elektronicznymi w przestrzeniach komercyjnych, a także tworzenie platform e-commerce i zaawansowanych modułów bazujących na sztucznej inteligencji ( m.in . rozpoznawanie obrazu) oraz narzędzi automatyzujących procesy QA. Stack technologiczny: 💻 React.js, Node.js, TypeScript, Next.js, Express, ekosystem AWS (S3, Lambda, EC2, SNS, SQS), MongoDB, Git, narzędzia CI/CD Zespół: 👥 Międzynarodowe grono specjalistów (ok. 8-9 osób), budowane dla stabilnej firmy technologicznej z korzeniami w Niemczech. Współpraca opiera się na płaskiej strukturze i dużej otwartości, a w codziennej pracy wspierać Cię będą doświadczeni liderzy techniczni oraz eksperci front-end. Metodyka pracy: 🔄 Agile / SCRUM Model współpracy: 🏢 Praca hybrydowa z biura w Warszawie (2 dni z biura, 3 dni pracy zdalnej) Zakres obowiązków: 🛠️ Aktywne uczestnictwo w pełnym cyklu powstawania oprogramowania – od fazy koncepcyjnej, przez architekturę, aż po wdrożenie i testowanie. Tworzenie, rozwój i utrzymanie skalowalnych rozwiązań webowych przy ścisłej współpracy z resztą międzynarodowego zespołu. Analiza wymagań, estymacja zadań oraz proponowanie nowych narzędzi lub bibliotek, które usprawnią projekt. Dbanie o najwyższą wydajność, niezawodność i jakość tworzonego kodu. Rozwiązywanie złożonych problemów inżynieryjnych. Przekładanie technicznych zawiłości na język zrozumiały dla nietechnicznych współpracowników oraz prezentowanie efektów swojej pracy. Oczekujemy: 🎯 Około 3-5 lat komercyjnego doświadczenia w tworzeniu oprogramowania ze znajomością środowiska backendowego i frontendowego. Biegłości w pracy z technologiami takimi jak: Node.js, React.js, TypeScript, Next.js oraz Express. Praktycznego doświadczenia w korzystaniu z usług chmurowych AWS (w tym m.in . EC2, Lambda, SQS, S3). Umiejętności projektowania API oraz dobrej znajomości baz danych (MongoDB). Biegłości w korzystaniu z systemów kontroli wersji (Git) oraz znajomości praktyk DevOps i procesów CI/CD. Dobrej znajomości języka angielskiego (niezbędna do codziennej komunikacji w zespole). Samodzielności w realizacji zadań, ale też umiejętności świetnej pracy zespołowej i dbałości o detale. Oferujemy: ✨ Zatrudnienie w oparciu o Umowę o Pracę. Prywatną opiekę medyczną (z opcją rozszerzenia pakietu dla bliskich). Dofinansowanie do zajęć sportowych oraz możliwość skorzystania z ubezpieczenia na życie. Kartę lunchową (zasilaną co miesiąc) po zakończeniu okresu próbnego. Elastyczne godziny rozpoczynania pracy (pomiędzy 8:00 a 10:00) i duże zrozumienie dla prywatnych spraw w ciągu dnia. Środowisko stawiające na "learning by doing" z szerokim dostępem do materiałów edukacyjnych i platform szkoleniowych (np. Udemy). Proces rekrutacyjny: 🤝 Rozmowa wprowadzająca: weryfikacja dopasowania do projektu oraz swobody komunikacji w języku angielskim. Wyzwanie techniczne (take-home assignment): praktyczne zadanie programistyczne do wykonania (czas na realizację to 7 dni). O nas Next Technology Professionals to wyspecjalizowana agencja rekrutacyjna i firma outsourcingowa o silnym profilu technologicznym. Od ponad 10 lat wspieramy firmy w budowie zespołów IT, AI, Cybersecurity, SAP oraz w rekrutacjach dla finansów, inżynierii i marketingu. Zrealizowaliśmy ponad 1000 skutecznych procesów rekrutacyjnych dla korporacji, scale-upów i dynamicznie rosnących startupów. Przesyłając swoje CV do Next Technology Professionals, trafiasz do starannie wyselekcjonowanej bazy kandydatów realizujących projekty dla wiodących globalnych organizacji. Pracujemy wyłącznie w oparciu o aktualne, konkretne potrzeby klientów. Jeśli Twój profil będzie odpowiadał jednemu z prowadzonych procesów, skontaktujemy się niezwłocznie.

🏢 Summary: Frontend engineering role focused on building scalable, high-performance web applications using React and Next.js. The position involves developing modern user interfaces, collaborating with cross-functional teams, and contributing to shared component architecture and development practices. Suitable for mid-level to senior developers with strong web development experience. 🗂️ Requirements: 5+ years frontend/web development experience, Strong experience with React, Strong experience with TypeScript, Experience with Next.js or similar framework, Understanding of performance and scalability principles, Experience integrating APIs and backend services, Experience with Git version control, Experience with CI/CD pipelines 📃 Skills: React, Next.js, TypeScript, JavaScript, HTML, CSS, REST, Git, CICD, Jest, Playwright, Cypress, Cloud 🏢 Description: Web Frontend Engineer (React / Next.js) Do you want to help shape modern, scalable web applications used by thousands of businesses worldwide? Our client is looking for a skilled frontend developer with a strong focus on web technologies — especially React and Next.js — to help drive the development of high-quality, user-centric solutions. About the Role In this role, you will play a key part in building and evolving our clients web-based user interfaces. You’ll work closely with product managers, UX designers, and backend engineers to deliver performant, scalable, and intuitive solutions that create real value for customers. We are looking for developers across different seniority levels — both experienced profiles and developers with 5–10 years of experience who are eager to grow and take ownership. Key Responsibilities Develop and maintain modern web applications using React, Next.js, and TypeScript Build reusable components and scalable frontend architecture Collaborate closely with product and design teams to translate requirements into high-quality user experiences Ensure performance, accessibility, and responsiveness across applications Contribute to and evolve shared component libraries and design systems Participate in code reviews and contribute to improving development practices Work with CI/CD pipelines and modern development workflows Stay updated on frontend trends, tools, and best practices Key Requirements Solid experience with React and TypeScript in a web context Experience with Next.js or similar frameworks is highly preferred 5+ years of experience in frontend/web development (we are open to mid-level and senior profiles) Strong understanding of modern web development principles (performance, scalability, component architecture) Experience working with APIs and integrating backend services Familiarity with version control (Git) and CI/CD pipelines A collaborative mindset and strong communication skills Motivation to learn, improve, and contribute to a strong engineering culture Nice to Have Experience with design systems and component libraries Knowledge of testing frameworks (e.g., Jest, Playwright, Cypress) Experience with performance optimization and monitoring Exposure to cloud environments and modern deployment setups

🏢 Summary: Senior Fullstack Engineer role focused on rebuilding and enhancing a modern web application using a contemporary TypeScript-based stack. The position involves hands-on frontend and backend development, ownership of features, and ensuring high-quality delivery within a small engineering team. Strong emphasis on Next.js, system design, testing, DevOps, and AI-assisted development. 🗂️ Requirements: 5+ years experience as Full-stack Engineer, Expert-level Next.js, Expert-level React, Expert-level TypeScript, Experience with PostgreSQL, Experience with Prisma or modern ORM, Experience with type-safe APIs (tRPC or similar), Experience with monorepo architectures (Turborepo, Nx or similar), Experience with React state management (Tanstack Query, Zustand), Strong understanding of unit, integration, and E2E testing, Experience with CI/CD pipelines, Experience with DevOps principles, Experience with observability (logging, monitoring, tracing), Ability to use AI coding assistants effectively, Fluent English communication skills 📃 Skills: Next.js, React, TypeScript, JavaScript, tRPC, Prisma, PostgreSQL, Supabase, Trigger.dev, Python, Tanstack, Zustand, ReactHookForm, Tailwind, shadcn, better-auth, Vitest, Playwright, Turborepo, pnpm, GitHubActions, CI/CD, DevOps 🏢 Description: About Us Latent AI is a leading AI solutions implementation partner, dedicated to helping our diverse clients solve their most complex challenges with cutting-edge technology. Our strength lies in our small, agile, and expert teams who deliver bespoke AI and machine learning solutions. We foster a culture of collaboration, innovation, and deep technical excellence. As we grow, we are seeking a leader who is passionate about nurturing the talented individuals at the heart of our success. Company Website : https://www.reachlatent.com/ The Role Start Date: March 1st 2026 We are looking for a senior fullstack engineer to join the team and work on rebuilding and enhancing a modern web application. The role is hands-on, covering both frontend and backend development, with a strong focus on quality, collaboration, and delivery. The ideal candidate is comfortable working with modern JavaScript frameworks, rebuilding existing systems, and using AI-assisted development tools effectively. This role suits someone who is proactive, communicates clearly, and can work independently while contributing as part of a close-knit engineering team. Our Tech Stack Frontend: Next.js, React 19, TypeScript, Tailwind v4, shadcn/ui Backend: tRPC, Prisma ORM, PostgreSQL, Supabase Background Jobs: Trigger.dev (TypeScript + Python) State & Data: Tanstack Query (React Query), Zustand, React Hook Form Auth: better-auth Testing: Vitest (unit/integration), Playwright (E2E) Monorepo: Turborepo + pnpm workspaces CI/CD: GitHub Actions What You’ll Do Project & Delivery Team Player: You will operate as part of a small team of full stack engineers who rebuild and maintain a full-stack web application (frontend & backend). Participate in technical discussions, reviews, and solution design. Proactive Ownership : A deep sense of accountability for your solutions, theproduct's quality, and its timely delivery. Own the planning and development of features of our Next.js/Node.js/Python platform. Hands-On Technical Expertise Core Stack Mastery: Expert-level, hands-on ability with Next.js and TypeScript . You must be able to write production-grade code. Full-Stack Context: A strong grasp of the entire system, including the backend data-processing services ( TypeScript ) and databases ( PostgreSQL ). DevOps & CI/CD: Solid experience with DevOps principles and CI/CD pipelines . You must understand how to maintain and improve a fast, reliable, and automated path from code to production. Observability: Experience implementing or managing observability tools (e.g.,logging, monitoring, tracing) to understand system health, debug issues, andensure high availability. Technical Quality & Testing: A strong understanding of modern testing strategies (unit, integration, e2e) and a commitment to shipping high-quality, well-tested code. AI Adoption: Leveraging AI coding assistants wisely to enhance development efficiency while keeping production level quality. Who You Are Technical Expert: Deep, hands-on experience with Next.js , TypeScript , and full-stack systems. Strong Communicator: Fluent in English, with ability to communicate complex technical ideas clearly and confidently to both engineers and clients. Business-Minded Engineer: You understand the “why” behind the code - connecting technical priorities directly to business outcomes. Problem Solver : You have the ability to make recommendations and contribute to the team technical discussions, constantly seeking ways to move forward, even when dealing with ambiguity. Role Requirements Must: Minimum of 5+ years of experience as a full-stack engineer, specifically working with modern web applications. Expert-level, hands-on ability with Next.js, React, and TypeScript. Deep experience with PostgreSQL and modern ORMs (we use Prisma). Experience with type-safe APIs (tRPC or similar approaches). Experience with monorepo architectures (Turborepo, Nx, or similar). Familiarity with React state management (Tanstack Query, Zustand). Working effectively with AI coding agents to enhance productivity. Commitment to high-quality code, including strong understanding of modern testing strategies (unit, integration, e2e). Excellent written and verbal communication skills in English, capable of communicating complex technical ideas clearly. Proven ability to work independently, proactively own outcomes, and contribute effectively as part of a small, close-knit team. Advantage: Experience with Tailwind CSS and modern component libraries (shadcn/ui). Experience with form libraries (React Hook Form or similar). Understanding of background job systems ( Trigger.dev , or similar). Experience with E2E testing frameworks. Understanding and experience with DevOps principles and managing CI/CD pipelines. Experience implementing or managing observability tools (logging, monitoring, tracing). Experience with authentication systems. Bonus Points: Experience in a consulting or professional services environment. Prior exposure to AI, ML, or data-driven platforms. Familiarity with distributed teams and cross-timezone collaboration. Why Join Us? This is a unique opportunity to shape the engineering culture at a growing AI services company. You'll have a direct impact on the careers of our talented engineers and play a pivotal role in our ability to deliver world-class solutions to our clients. If you are a leader who believes that great technology is built by happy, empowered, and supported people, we would love to hear from you.

🏢 Summary: Frontend role focused on building scalable and maintainable React and Next.js applications as part of a global technology modernization initiative. The position involves designing frontend architecture, developing reusable UI components, and optimizing performance for core business systems powered by AWS and Python backend services. The project is in an early stage, requiring architectural input and high technical expertise. 🗂️ Requirements: Bachelor's degree in Computer Science or related field, 5+ years of frontend development experience, At least 3 years in middle or senior frontend role, Extensive experience with React.js including hooks and Context API, Strong knowledge of Next.js with SSR and SSG, Experience with Fluent UI or similar component library, Strong knowledge of frontend performance optimization, Experience designing scalable component libraries 📃 Skills: React, Next.js, JavaScript, FluentUI, AWS, Python, SSR, SSG 🏢 Description: Client Our client is one of the leading reinsurance service providers across the globe. Their technological platform is constantly evolving as they apply new and emerging technologies to their expanding business. Project overview Clients’ technological platforms are constantly evolving as they adopt new and emerging technologies to support their expanding businesses. The team manages applications at the heart of clients’ core business strategies and supports a global user base. The nature of clients’ businesses demands high levels of agility, which in turn requires the team to be technically superior. The project is part of clients’ global technology modernization roadmaps. It aims to equip key business lines with the technology needed to address modern market challenges and seize new opportunities. The development focuses on core business applications using a modern AWS toolset with Python on the backend. As the project is in its early stages, a significant portion of the work involves architectural design, technology selection, and proof-of-concept (POC) activities. Position overview We are looking for an experienced React & Next.js Developer to join our team. In this role, you will be responsible for developing scalable and maintainable frontend architectures using React.js and Next.js. You will work closely with UX designers to deliver user-friendly, high-performance UI components, ensuring a seamless experience for a global user base. This position offers the opportunity to contribute to a cutting-edge project that is part of a broader technology modernization roadmap, leveraging modern AWS tools and Python on the backend. Responsibilities Develop scalable and maintainable frontend architecture using React.js and Next.js Implement and optimize reusable UI components using Fluent UI Collaborate with UX designers to ensure consistent and user-friendly component designs Conduct code reviews and provide constructive feedback to team members Optimize components for maximum performance and reusability Stay updated with the latest frontend technologies and industry trends Requirements Bachelor's degree in Computer Science or related field 5+ years of experience in frontend development, with at least 3 years in a middle or a senior role Extensive experience with React.js, including hooks and context API Strong knowledge of Next.js and its features for server-side rendering and static site generation Proficiency in working with Fluent UI or similar component libraries Deep understanding of frontend performance optimization techniques Experience in designing and implementing scalable component libraries Excellent problem-solving skills and attention to detail Strong communication skills and ability to work in a collaborative environment Nice to have Experience with micro frontends architecture Familiarity with design systems and component-driven development Knowledge of testing frameworks Understanding of CI/CD pipelines and build tools What We Offer: Vacation days : Up to 26 business days per year. 10 illness/special days off per year (fully paid, no medical papers needed) for all contract types Health and life insurance (Luxmed) MyBenefit platform with Multisport option Internal psychological support service English language classes from the first working day Access to external learning platforms : O’Reilly, LinkedIn Learning, Udemy, and a wide catalog of diverse internal training Flexible workplace : work from the office, from home, or choose a hybrid option Tech Skills Mentoring Program Opportunities to develop as a public speaker, mentor, or technical interviewer Fully paid idle (bench) when not involved in a project Certification reimbursement (AWS, GCP, Microsoft, etc.)

🏢 Summary: Frontend React Developer role focused on building and scaling modern web applications using React and Next.js in distributed, cloud-based environments. The position involves developing reusable components, integrating with APIs and cloud services, and ensuring high performance, security, and code quality through testing and best practices. The role requires strong experience in scalable architectures and collaboration within microservices-based systems. 🗂️ Requirements: 5+ years of commercial experience with React, Strong knowledge of JavaScript and TypeScript, Practical experience with React hooks, routing, and state management, Experience in distributed systems or microservices environments, Experience with cloud platforms (GCP preferred), Experience building scalable applications consuming REST APIs and JSON, Knowledge of data structures and algorithms, Proficiency in HTML and modern CSS approaches, Experience with automated testing (unit, integration, end-to-end), Ability to debug and optimize applications using browser developer tools, Experience building responsive web interfaces 📃 Skills: React, Next.js, JavaScript, TypeScript, HTML, CSS, Tailwind, SASS, CSSModules, REST, JSON, GCP, Microservices, UnitTesting, IntegrationTesting, E2E, BrowserTools, DataStructures, Algorithms 🏢 Description: We are looking for a Frontend React Developer for our client – a global technology consulting company focused on data, analytics, and cloud-based solutions, supporting international organizations in building scalable digital products. They operate in a distributed environment, combining strong engineering practices with a business-oriented mindset to deliver impactful solutions across multiple industries. Your responsibilities Build and enhance modern web applications using React and Next.js Create reusable components and contribute to scalable frontend architecture Work closely with cross-functional teams including backend engineers, data specialists, and product stakeholders Improve performance, security, and overall user experience of applications Connect frontend layers with APIs and cloud-based services Maintain high development standards through testing and clean coding practices. Requirements At least 5 years of hands-on experience with React in commercial projects Strong command of JavaScript and TypeScript Practical understanding of React fundamentals, including hooks, routing, and state management solutions Experience working in distributed systems or microservices environments Exposure to cloud platforms (GCP experience is an advantage) Background in developing scalable applications that consume REST APIs and work with JSON data Solid grasp of core programming concepts such as data structures and algorithms Good knowledge of HTML and modern CSS approaches (e.g. Tailwind, SASS, CSS Modules, or similar tools) Experience with automated testing (unit, integration, and end-to-end) Ability to debug and optimize applications using browser developer tools Experience in building responsive and user-friendly interfaces across devices Strong communication skills and experience working in collaborative, distributed teams Self-driven approach with a strong sense of ownership English proficiency at B2 + level or higher.

🏢 Summary: Remote B2B opportunity for a Senior Fullstack Developer specializing in .NET and Blazor/Angular to design, develop, and maintain complex web applications and cloud-based solutions. The role involves full software lifecycle responsibilities, DevOps collaboration, automated deployments, code reviews, and working with modern architectures such as microservices and event-driven systems. Candidates should have strong expertise in .NET technologies, cloud platforms, containerization, and Agile development practices. 🗂️ Requirements: 5+ years experience as a .NET or Fullstack Developer, Strong knowledge of C#, .NET, .NET Framework, ASP.NET MVC Core, Experience with Blazor, Experience with React, Experience with Azure Functions, Experience with MS SQL, Experience with Entity Framework, Knowledge of microservices and SOA, Experience with event-driven architecture, Experience with Kubernetes, Experience with Docker, Understanding of SOLID principles, Knowledge of Git, Experience using Agentic AI tools in development workflows, Experience working in Agile methodologies, Strong analytical and problem-solving skills, English level B2 or higher 📃 Skills: C#, .NET, ASP.NET, Blazor, Angular, React, Azure, AWS, AzureFunctions, SQL, MSSQL, MongoDB, EntityFramework, Kubernetes, Docker, Git, Microservices, SOA, CQRS, MediatR, GraphQL, GRPC, Redis, DuckDB, YAML, XML 🏢 Description: Hi there! We are STX Next, a global IT consulting company specializing in customer-focused software services. Join a group of 500 professionals dedicated to helping customers build outstanding products. Leveraging the latest advancements in the field, and a passion for innovation, we're shaping the future of technology one project at a time. Are you the NEXT one? Type of contract A B2B contract for your flexibility and competitive compensation package Location A remote work model encouraging work-life balance. Salary Up to 25 200 PLN net+VAT Job description We are looking for a skilled .Senior Fullstack Developer (.NET + Blazor / Angular) with experience in ASP.MVC Core, EntityFramework, SQL, Mongo, and Azure/AWS. The ideal candidate will have a strong understanding of web development principles and be able to design, develop, and maintain complex web applications. Responsibilities Designing, developing, and maintaining applications using .NET technologies. Writing clean, maintainable, and efficient code. Troubleshooting and debugging applications. Implementing security and data protection. Collaborating with team members for continuous improvement. Staying up-to-date with new technology trends. Designing, implementing, and maintaining automated builds and deployment. Spreading knowledge about new and relevant technologies among the development team. Coding features (data access, business logic, and UI), fixing bugs, and writing unit tests. Testing and documenting (if required to help the team achieve goals). Helping with production issues. Helping to develop/maintain the DevOps culture in the organization. Conducting code reviews of other team members. Requirements Must have: Minimum 5 years of professional experience as a .NET or Fullstack Developer, with a strong focus on C#, .NET, .NET Framework, and ASP. NET MVC Core. Experience with web and cloud technologies, including Blazor, React, Azure Functions , MS SQL, and Entity Framework. Solid background in modern architecture, specifically microservices (SOA), event-driven design, Kubernetes, and Docker. Deep understanding of engineering best practices, including web development principles, SOLID, and Git version control. Proficiency in using Agentic AI in daily workflows for code generation, reviews, documentation, testing, and refactoring. Experience working in Agile methodologies, demonstrating initiative and the ability to deliver results without close supervision. Strong analytical, problem-solving, and communication skills, combined with an internal drive for technical excellence. High adaptability and a positive "can-do" attitude, with the ability to change direction based on lessons learned. English proficiency at a B2 level or higher. Nice to have: Ability to create containerized applications. Ability to choose and configure the correct MCP for the project needs. Experience with CQRS pattern using MediatR. Experience with GraphQL, GRPC. Experience with integrating AI tools into team workflows. Experience with defining and configuring AI-augmented workflows using structured formats (XML, YAML). Good understanding of serverless architecture and Azure Cloud/AWS. Knowledge of NoSQL databases like MongoDB, Redis, Duck DB. Benefits Remote-First Flexibility Stay where you feel most productive. Here’s a remote-first environment with the freedom to set your own schedule. Whether you need a midday break or a specific routine, we trust you to manage your time and deliver results while maintaining your personal well-being. Collaboration Mindset Facing a complex challenge? At STX Next, you collaborate with true enthusiasts and experts who prioritize professional support and direct, honest feedback. Tech Events Gain access to specialized knowledge through bootcamps, Strategic Skills Labs, and Tech Knowledge Hubs focused on AI, Data, and Cloud. Beyond our internal webinars and technical materials, we host branded meetups like DevDuck and PAIDA . And much more, find out HERE

🏢 Summary: Fullstack Engineer role focused on building and scaling a global data-driven insights platform using modern JavaScript technologies. The position involves developing backend and frontend services, designing scalable databases, and influencing system architecture. You will work on high-load systems, ensure code quality, and contribute to technical decisions and mentoring. 🗂️ Requirements: 5+ years of experience with JavaScript and Node.js, 3+ years of experience with TypeScript and React or Next.js, Hands-on experience with scalable backend systems, Experience designing SQL and NoSQL database schemas, Ability to optimize queries for high-load systems, Knowledge of web fundamentals and networking concepts, Understanding of OWASP security best practices, Experience with AWS cloud services, Experience writing unit, integration, and e2e tests, Professional proficiency in English 📃 Skills: JavaScript, Node.js, TypeScript, React, Next.js, REST, GraphQL, SQL, NoSQL, AWS, CORS, OWASP, Microservices, Serverless 🏢 Description: We’re building a data-driven insights platform used by professionals worldwide. Our mission is to turn complex data into actionable insights and empower teams to make better decisions. We value ownership, technical excellence, and collaboration . If you enjoy building scalable systems, mentoring engineers, and shaping software architecture, you’ll fit right in. 🎯 Your mission Develop and maintain backend and frontend services (REST/GraphQL APIs, React apps) Design scalable database schemas (SQL & NoSQL) and optimize queries for high-load systems Collaborate with product, design, and DevOps teams to deliver robust solutions Write clean, tested code (unit, integration, e2e) Influence architecture and technical decisions Mentor other developers and share best practices 📌 You should have 5+ years in JavaScript / Node.js 3+ years in TypeScript + React/Next.js Hands-on experience with scalable backend systems Knowledge of web fundamentals & networking (CORS, browser behavior) Understanding of security best practices (OWASP) Experience with cloud services (AWS preferred) Strong communication skills in English Ability to work independently and take ownership ✨ Nice to have Experience with microservices / serverless architectures Data pipelines, scraping, or data-heavy applications Team leadership or mentoring experience Exposure to AI/ML integrations 💡 Why join us High-impact role on a global data platform Work with modern technologies and best engineering practices Autonomy & ownership in your work Collaborative and experienced team Competitive employment package and benefits.

🏢 Summary: Backend-focused Node.js Developer role for building scalable IoT management systems, e-commerce platforms, and AI-based modules. The position involves full software development lifecycle participation with strong emphasis on AWS-based cloud architecture and API development. Opportunity to optionally expand into React/Next.js within an Agile international team. 🗂️ Requirements: 3-5 years commercial backend development experience, Strong proficiency in Node.js, Strong proficiency in TypeScript, Experience with Express, Practical experience with AWS services (EC2, Lambda, S3, SQS, SNS), Experience designing and developing APIs, Experience with MongoDB, Proficiency with Git, Knowledge of DevOps practices, Experience with CI/CD pipelines, English proficiency for daily communication 📃 Skills: Node.js, TypeScript, Express, AWS, S3, Lambda, EC2, SNS, SQS, MongoDB, Git, CICD, React, Next.js, Agile, Scrum 🏢 Description: Dla naszego klienta poszukujemy kandydatów na stanowisko: Node.js Developer with AWS Projekt: 🚀 Rozwój innowacyjnych systemów z obszaru IoT do zarządzania urządzeniami elektronicznymi w przestrzeniach komercyjnych, a także tworzenie platform e-commerce i zaawansowanych modułów bazujących na sztucznej inteligencji ( m.in . rozpoznawanie obrazu) oraz narzędzi automatyzujących procesy QA. Stack technologiczny: 💻 Backend (Główny focus): Node.js, TypeScript, Express, ekosystem AWS (S3, Lambda, EC2, SNS, SQS), MongoDB Frontend (Mile widziane / Do nauki): React.js, Next.js Narzędzia: Git, CI/CD Zespół: 👥 Międzynarodowe grono specjalistów (ok. 8-9 osób), budowane dla stabilnej firmy technologicznej z korzeniami w Niemczech. Współpraca opiera się na płaskiej strukturze i dużej otwartości, a w codziennej pracy wspierać Cię będą doświadczeni liderzy techniczni oraz eksperci front-end (od których będziesz mógł/mogła się uczyć, jeśli zechcesz rozwijać się w tym kierunku!). Metodyka pracy: 🔄 Agile / SCRUM Model współpracy: 🏢 Praca hybrydowa z biura w Warszawie (2 dni z biura, 3 dni pracy zdalnej) Stawka: 💰 do 15000 zł brutto miesięcznie (UoP) Zakres obowiązków: 🛠️ Aktywne uczestnictwo w pełnym cyklu powstawania oprogramowania, ze szczególnym uwzględnieniem warstwy backendowej – od fazy koncepcyjnej, przez architekturę, aż po wdrożenie i testowanie. Tworzenie, rozwój i utrzymanie skalowalnych rozwiązań serwerowych oraz API przy ścisłej współpracy z resztą międzynarodowego zespołu. Dla chętnych: Możliwość zaangażowania się w zadania frontendowe i płynna nauka technologii takich jak React czy Next.js w praktyce. Analiza wymagań, estymacja zadań oraz proponowanie nowych narzędzi lub bibliotek. Dbanie o najwyższą wydajność, niezawodność i jakość tworzonego kodu. Rozwiązywanie złożonych problemów inżynieryjnych. Przekładanie technicznych zawiłości na język zrozumiały dla nietechnicznych współpracowników. Oczekujemy: 🎯 Około 3-5 lat komercyjnego doświadczenia w tworzeniu oprogramowania ze szczególnym naciskiem na środowisko backendowe . Biegłości w pracy z technologiami: Node.js, TypeScript oraz Express . Praktycznego doświadczenia w korzystaniu z usług chmurowych AWS (w tym m.in . EC2, Lambda, SQS, S3). Umiejętności projektowania API oraz dobrej znajomości baz danych ( MongoDB ). Biegłości w korzystaniu z systemów kontroli wersji (Git) oraz znajomości praktyk DevOps i procesów CI/CD. Dobrej znajomości języka angielskiego (niezbędna do codziennej komunikacji w zespole). Samodzielności, umiejętności świetnej pracy zespołowej i dbałości o detale. 🌟 Mile widziane: Podstawowa znajomość technologii frontendowych (React.js, Next.js) LUB otwartość i chęć ich nauki w trakcie trwania projektu. Oferujemy: ✨ Przestrzeń do nauki Frontendu: Jeśli chcesz poszerzyć swoje kompetencje o React.js / Next.js, nasi eksperci z przyjemnością wdrożą Cię w te technologie. Zatrudnienie w oparciu o Umowę o Pracę. Prywatną opiekę medyczną (z opcją rozszerzenia pakietu dla bliskich). Dofinansowanie do zajęć sportowych oraz możliwość skorzystania z ubezpieczenia na życie. Kartę lunchową (zasilaną co miesiąc) po zakończeniu okresu próbnego. Elastyczne godziny rozpoczynania pracy (pomiędzy 8:00 a 10:00) i duże zrozumienie dla prywatnych spraw w ciągu dnia. Środowisko stawiające na "learning by doing" z szerokim dostępem do materiałów edukacyjnych i platform szkoleniowych (np. Udemy). Proces rekrutacyjny: 🤝 Rozmowa wprowadzająca: weryfikacja dopasowania do projektu oraz swobody komunikacji w języku angielskim. Wyzwanie techniczne (take-home assignment): praktyczne zadanie programistyczne (skupione głównie na Twoich umiejętnościach backendowych) do wykonania w dogodnym czasie (masz na to 7 dni). O nas Next Technology Professionals to wyspecjalizowana agencja rekrutacyjna i firma outsourcingowa o silnym profilu technologicznym. Od ponad 10 lat wspieramy firmy w budowie zespołów IT, AI, Cybersecurity, SAP oraz w rekrutacjach dla finansów, inżynierii i marketingu. Zrealizowaliśmy ponad 1000 skutecznych procesów rekrutacyjnych dla korporacji, scale-upów i dynamicznie rosnących startupów. Przesyłając swoje CV do Next Technology Professionals, trafiasz do starannie wyselekcjonowanej bazy kandydatów realizujących projekty dla wiodących globalnych organizacji. Pracujemy wyłącznie w oparciu o aktualne, konkretne potrzeby klientów. Jeśli Twój profil będzie odpowiadał jednemu z prowadzonych procesów, skontaktujemy się niezwłocznie.

🏢 Summary: Senior Full Stack Team Lead role focused on building and scaling web applications using React and Node.js while leading a development team. The position combines hands-on front-end and back-end development with architecture design, API development, and deployment in cloud environments. You will drive technical decisions, ensure code quality, and oversee delivery of scalable, production-ready systems. 🗂️ Requirements: 7+ years full-stack development experience with React and Node.js, 2+ years experience in leadership or senior technical role, Strong experience with React.js, Redux, React Hooks, Strong knowledge of HTML5, CSS3, modern JavaScript, Proficiency in Node.js and Express.js, Experience building REST APIs, Experience with PostgreSQL or MySQL, Experience with authentication methods (OAuth, JWT, sessions), Experience with CI/CD and Docker, Experience working with production systems, Experience with Git, Understanding of Agile/Scrum methodologies 📃 Skills: React, Redux, JavaScript, HTML5, CSS3, Node.js, Express, REST, GraphQL, PostgreSQL, MySQL, OAuth, JWT, Docker, Kubernetes, AWS, Azure, GCP, Git, CI/CD, Webpack, Babel, Vite, MongoDB 🏢 Description: Overview We are a leading company in AI-based enterprise operations. We provide digital solutions and consulting services that help businesses grow and improve. We use modern technology to make processes simpler, increase efficiency, and create new ways to earn money, especially in private capital markets. Our ecosystem includes three main parts. First, PaaS (Platform as a Service) with the Orion Platform, which helps improve workflows, show useful insights, and support value growth across portfolios. Second, SaaS (Software as a Service), a cloud platform that offers strong performance and smart tools at scale. Third, our Solutions and Consulting Suite, which includes flexible technology solutions to manage, grow, and improve company performance. With more than 10 years of experience, we support fast-growing companies and private equity platforms, turning technology into a real business advantage. Responsibilities and Duties We are looking for an experienced Full Stack Team Lead with strong skills in React and Node.js. The right person has over 7 years of experience building high-quality web applications and has experience leading a team. You will guide developers, work on both front-end and back-end, take part in all stages of development, and support junior team members. Key Responsibilities Team Leadership & Mentorship: Lead and support a team of developers. Help them grow, review code, and give technical advice. Front-End Development: Build and maintain user interfaces using React.js, Redux, and modern JavaScript. Back-End Development: Create strong and scalable server applications and APIs using Node.js and Express. Integration: Work with database engineers to design databases and manage data using MongoDB or SQL. Application Architecture: Design scalable systems and microservices that meet business needs. Testing & Debugging: Write tests, fix issues, and improve performance. Support good testing practices. Deployment: Manage releases using CI/CD tools and Docker. Collaboration: Work with designers, product managers, and developers to create useful solutions. Communicate with both technical and non-technical teams. Maintenance: Monitor systems, fix problems, and improve applications. Documentation: Write and maintain technical documents for systems and APIs. Requirements Front-End: Strong experience with React.js, Redux, React Hooks, and component-based design Good knowledge of HTML5, CSS3, and modern JavaScript Familiar with tools like Webpack, Babel, or Vite Back-End: Strong skills in Node.js and Express.js Experience building and using APIs (GraphQL is a plus, REST is required) Knowledge of authentication methods like OAuth, JWT, and sessions Database: Experience with PostgreSQL or MySQL Additional Skills: Experience with Docker and Kubernetes is a plus Knowledge of cloud platforms like AWS, Azure, or GCP Experience with Git Understanding of Agile/Scrum methods Qualifications At least 7 years of experience in full-stack development with React and Node.js At least 2 years in a leadership or senior role Experience working with live production systems Bachelor’s degree in Computer Science or similar (preferred) Soft Skills Strong problem-solving and analytical thinking Good communication and teamwork skills Ability to work independently and manage tasks well Willingness to learn new technologies and improve continuously Why Join Us? We look for people who solve problems creatively, learn quickly, and enjoy working in an open and diverse team. We work hard, but we also like to enjoy what we do and aim for high results.