Full Stack Developer

🏢 Summary: Permanent Senior Full Stack Developer role working with key clients on complex digital products using a modern TypeScript-based stack across frontend and backend. The position involves direct client collaboration, strong product impact, and full ownership of clean, maintainable code within a fully remote setup. The role focuses on React/Next.js on the frontend and Node.js/NestJS with PostgreSQL on the backend. 🗂️ Requirements: Commercial experience with React.js, Strong knowledge of JavaScript, Strong understanding of TypeScript type system, Experience with Node.js and NestJS, Experience with PostgreSQL or relational databases, Knowledge of CSS techniques (CSS-in-JS, CSS Modules, SCSS, Tailwind), Understanding of web platform and browser APIs, Understanding of server-client communication, Understanding of database design and efficient usage, English B2+, Polish B2+ 📃 Skills: TypeScript, JavaScript, React, Next.js, Node.js, NestJS, PostgreSQL, CSS, SCSS, Tailwind, CSS-in-JS, CSSModules, WebAPIs 🏢 Description: About the company WAYF is where ideas go to be made real. We're a digital product agency built for visionaries – from ambitious founders to global enterprises. Since 2020, our 35+ person team (primarily based in Poland, working globally) has helped category leaders design and deliver digital experiences that move the needle. We're trusted by the Council of Europe Development Bank (CEB) to reimagine how they communicate the human stories behind their multi-billion euro impact. We collaborate with large corporations like Ingersoll Rand on product design, engineering, and process innovation across global markets. We shape digital platforms for cultural icons like Okolice Ciała – whose books, viral content, and community inspire millions across Poland and beyond. Startups and scaleups like Framer and Rye (founded by Justin Kan of Twitch) choose us for product design, brand upgrades, and mission-critical product and marketing launches. VC firms like Primary and 201.vc rely on us to bring clarity and craft to their brands and portfolio companies. Our track record also includes helping shape early product and design foundations at Ramp Network – now one of the most recognisable crypto brands globally – in a multi-year collaboration that spanned their rise from bold beginnings to breakout success. Inside WAYF, feedback is fast and honest. People are kind, curious, and self-driven. We care deeply about the work – and each other. We operate like a tight-knit studio with the ambition of a global consultancy. It's a place to grow, do meaningful projects, and build what others say can't be done. About the role We are looking for a Senior Full Stack Developer to join our team permanently after a trial period and work with our key clients on their most exciting projects! Technical info for this position General: TypeScript Backend: Node.js, NestJS, PostgreSQL Frontend: React.js, Next.js Mobile: React Native (optional/nice-to-have) Compensation: 18 000 zł - 25 000 zł B2B Core tools we use Slack, Linear, Notion Tasks Use a modern tech stack: TypeScript, React.js, Next.js, Node.js Work directly with our clients, alongside our tightly knit team (Project Managers included!) Have direct impact on the product vision and direction Write clean, maintainable code Have 100% of your code reviewed Self-manage and organise your work as you like — as long as it's effective Join our knowledge-sharing initiatives Tech requirements ✔️ A solid understanding of JS, its benefits, and limitations ✔️ Commercial experience with React.js ✔️ Understanding of the Typescript type system, it's pros and cons ✔️ Knowledge of different techniques of writing CSS - CSSinJS, CSS modules, SCSS, Tailwind ✔️ Knowledge of web platform and its APIs ✔️ Understanding of how the web works from top to bottom- server-client communication ✔️ Understanding of how databases work and how to use them efficiently A note on AI We use AI tools daily: in development, in design, in how we think about problems. We're not looking for people who treat this as a threat or a shortcut, but as a fundamental shift in how great software gets built. If you're curious, adaptive, and already weaving AI into your workflow, you'll feel right at home. If you're waiting for it to blow over – this probably isn't the right fit. Soft requirements 🗣️ English B2+ (for Communication with Clients and Partners) and Polish B2+ (for internal communication) ⛱️ Experience with working remotely 💬 Transparent communication 👀 Attention to detail 👩‍💻 Self-driven and can self-manage 👋 Kind and can take & give feedback openly 🚀 A knack for product understanding and value-driven development Benefits 💰 Annual performance-based bonuses ⛱️ Work fully remotely with full autonomy (no micromanagement) 💻 Work with modern hardware and software (we aim to use MacBooks exclusively, Linux is an option in specific cases) 💊 Stay on top of your game with generous private healthcare coverage (including dental) 🏃‍♂️ Into sports? Enjoy our Multisport package for access to their wide range of discounts and free passes 🌴 Take time off whenever you need it. 23 paid vacation days per year (pro-rated during your first year) plus paid days off during our annual retreats 🍱 Enjoy a 0.5h paid lunch break every workday 💸 Grow through regular progress check-ins, with salary increases and promotions 👫 Join our bi-annual retreats to hang out with the team (optional but encouraged) What does our recruitment process look like? After your CV has grabbed our attention, you can expect: Quick intro call to get to know each other. Technical Interview - a 1.5h call with one of our senior developers, where you'll be tested for relevant theoretical and practical skills You get an offer from us and we start working together ASAP! Footnote Check out wayfdigital.com for more info We are committed to building an open, inclusive environment for all members of our collective. WAYF does not and shall not discriminate on the basis of race, color, religion, gender, gender expression, age, national origin, disability, marital status, military status, sexual orientation, or social status.

🏢 Summary: Full-time Senior Full Stack Developer role focused on building scalable frontend applications and BFF services using TypeScript, React, Node.js, and NestJS. The position involves API and LLM integrations, frontend architecture design, performance optimization, and collaboration with product and engineering teams. Hybrid work from Kraków is expected 2–3 days per week. 🗂️ Requirements: Strong experience with TypeScript, Several years of software engineering experience, Strong React and modern frontend development expertise, Experience with frontend unit and integration testing, API design and development experience with NestJS, Experience with Node.js, Understanding of server-side rendering and Server Components, Knowledge of CDN strategies and caching, Understanding of software architecture and system design, Experience with Docker, Experience with Git, Experience with CI/CD, Experience with Azure, Ability to work in uncertain environments and solve problems pragmatically 📃 Skills: TypeScript, React, NestJS, Node.js, Docker, Git, CI/CD, Azure, GraphQL, Zustand, ReactQuery, Python 🏢 Description: Role overview Svitla Systems Inc. is looking for a Senior Full Stack Developer for a full-time position (40 hours per week) in Kraków, Poland. Our client is a British wholesale distributor. You will be responsible for building user interfaces with TypeScript and React, developing and maintaining BFF services, integrating APIs and LLM services, designing scalable frontend architecture, optimizing application performance and user experience, implementing error handling and resilience patterns, and collaborating with product and engineering teams to deliver features from prototype to production. Office work is expected 2-3 days per week. Responsibilities Building user interfaces using TypeScript and React. Building and maintaining Backend for Frontend (BFF) services to orchestrate API calls and shape data for user interface needs. Integrating APIs, LLM services, and streaming endpoints to deliver product features. Designing and implementing scalable and maintainable frontend architecture. Ensuring performance, responsiveness, and optimal user experience across the application. Implementing error handling, loading states, and resilience patterns for distributed systems. Collaborating with product and engineering teams to bring concepts from prototype to production. Requirements Strong hands-on experience with TypeScript development. Several years of experience in software engineering, ideally with a strong focus on React and modern frontend development tools. Experience with frontend testing, including unit and integration testing. API design and development experience using NestJS and Node.js. Understanding of server-side rendering, Server Components, CDN strategies, and caching. Solid understanding of software architecture, clean code, and system design. Ability to work effectively in environments with a high degree of uncertainty and take a pragmatic, solution-oriented approach to problem-solving. Experience with Docker, Git, CI/CD, and Azure. Nice to Have Knowledge of GraphQL APIs. Experience with state management libraries (e.g. Zustand, React Query). Familiarity with Python, particularly in the context of working with backend services or AI-powered systems. Experience building data-intensive or real-time user interfaces. Familiarity with designing user experiences for AI-powered features or non-deterministic outputs. We offer US and EU projects based on advanced technologies. Competitive compensation based on skills and experience. Regular performance appraisals to support your growth. Flexibility in the workspace, either remote or in our welcoming office. Comprehensive medical insurance after one month. MultiSport card with access to 2500 sports facilities all over Poland Bonuses for recommendations of new employees. Bonuses for article writing, public talks, and other activities. 15 vacation days, 10 national holidays, 10 sick leaves, and family days off. Personalized learning program tailored to your interests and skill development. Free tech webinars and meetups organized by Svitla. Welcome and anniversary presents, gifts for children, and more. Regular corporate events and meetups. Awesome team, friendly and supportive community!

🏢 Summary: Full Stack JavaScript Developer role focused on building and maintaining a large-scale data processing and analytics platform, covering backend services, frontend applications, and scalable data pipelines. The position involves developing RESTful APIs, microservices, and cloud-based solutions in AWS, with strong emphasis on performance, security, and database optimization. The role includes working on complex systems using Node.js, React, and PostgreSQL in a modern engineering environment. 🗂️ Requirements: Strong experience with Node.js (v22+), Strong experience with Express.js, Solid knowledge of React (v16+), Experience with PostgreSQL and query optimization, Very good understanding of asynchronous JavaScript, Experience designing RESTful APIs, Knowledge of microservices architecture, Understanding of distributed systems, Experience with testing frameworks, Experience with Git, Knowledge of modern build tools, Understanding of web security best practices, Basic knowledge of AWS, Ability to implement authentication and authorization mechanisms (JWT, ACL) 📃 Skills: JavaScript, Node.js, Express.js, React, PostgreSQL, SQL, REST, Microservices, AWS, JWT, ACL, Jest, Mocha, Git, Webpack, Rollup, ETL, CI/CD, Docker 🏢 Description: Full Stack JavaScript Developer (Node.js / React) About CRIF CRIF is an international company providing credit and business information services, data processing, and advanced decisioning solutions. We support financial institutions, insurers, utilities, and enterprises with reliable data, analytics, and secure, scalable technology platforms. WBO (White Blue Ocean) is CRIF’s personal and cyber security division focused on advanced monitoring of the Open and Dark Web. Using AI and machine learning, it identifies leaked, stolen, or exposed data and delivers proactive alerts for individuals and companies. Role Overview We are looking for an experienced Full Stack JavaScript Developer to join the WBO team and help build a complex data processing and analytics platform, covering backend services, frontend applications, and large-scale data pipelines. Key Responsibilities Design, develop, and maintain scalable backend services using Node.js Build modern, responsive web applications with React Develop and maintain RESTful APIs and microservices Implement and optimize data processing pipelines (ETL, streaming) Design and optimize PostgreSQL databases and complex queries Implement authentication and authorization mechanisms (JWT, ACL) Optimize application performance and data processing efficiency Write and maintain unit and integration tests Participate in code reviews and ensure high code quality Deploy and maintain applications in an AWS cloud environment Troubleshoot production issues and implement sustainable solutions Collaborate with the team on architecture and technical decisions Document technical solutions and API specifications Required Skills & Experience Strong experience with Node.js (v22+) and Express.js Solid knowledge of React (v16+) Experience with PostgreSQL and query optimization Very good understanding of asynchronous JavaScript (async/await, Promises) Experience designing scalable RESTful APIs Knowledge of microservices and distributed systems Familiarity with testing frameworks (Jest, Mocha) Experience working with Git and modern build tools (Webpack / Rollup) Understanding of web security best practices Basic knowledge of AWS and cloud architecture concepts Nice to Have Experience with AWS Lambda, S3, Athena, CloudWatch Docker and CI/CD pipelines (e.g. Jenkins) TypeScript, Redis, Bull, Socket.io Python or Rust for performance-critical components Experience working with and modernizing legacy systems What We Offer Employment contract Hybrid work model (50/50 – office in Kraków ) Work on large-scale, data-driven systems in an international environment Real impact on system architecture and technology decisions Modern tech stack and strong engineering culture Cooperation with experienced and supportive teams Competitive salary aligned with your experience (salary range will be shared during the first interview)

🏢 Summary: Hybrid Team Lead FullStack role focused on building and scaling high-performance web applications using React and Node.js, while leading a development team. The position combines hands-on front-end and back-end development with architectural design, API development, and cloud-based deployments. You will drive technical excellence across the full software development lifecycle in an international R&D environment. 🗂️ Requirements: 7+ years full-stack development experience with React and Node.js, 2+ years experience in team leadership or senior developer role, Expertise in React.js, Redux, React Hooks, Strong knowledge of HTML5, CSS3, JavaScript (ES6+), Proficiency in Node.js and Express.js, Experience designing RESTful APIs or GraphQL APIs, Knowledge of OAuth, JWT or session-based authentication, Experience with PostgreSQL or MySQL, Experience with AWS, Azure or GCP, Experience with Docker and CI/CD pipelines 📃 Skills: React, Redux, JavaScript, HTML5, CSS3, Node.js, Express, GraphQL, REST, OAuth, JWT, PostgreSQL, MySQL, AWS, Azure, GCP, Docker, Kubernetes, CI/CD, Webpack, Babel, Vite 🏢 Description: Team Lead FullStack (Node.js, React) IT · Warsaw (City Center) · Hybrid About the Client Our Client is a fast-growing, international technology company that provides innovative digital solutions for the global market. They are currently expanding and developing their R&D center in Warsaw. They are a leader in AI-powered enterprise operations, delivering digital solutions and consulting services that drive value and transform businesses. They specialize in using advanced technology to streamline operations, improve efficiency, and unlock new revenue opportunities, particularly within the private capital markets. With over a decade of experience supporting high-growth companies, they bring deep domain expertise and a proven ability to turn technology into a strategic advantage. Role Overview We are seeking a highly skilled Full Stack Team Lead with expertise in React and Node.js to lead our dynamic team. The ideal candidate will have over 7 years of experience in designing and building high-performance web applications, along with demonstrated leadership experience. You will lead a team of developers, working on both front-end and back-end development, contributing to every stage of the software development lifecycle, and mentoring junior team members. Key Responsibilities Team Leadership & Mentorship: Lead and mentor a team of software engineers, fostering a collaborative and high-performance environment. Provide technical guidance, conduct code reviews, and support professional development. Front-End Development: Build and maintain interactive and responsive user interfaces using React.js, Redux, and modern JavaScript (ES6+). Back-End Development: Develop robust, scalable server-side applications and RESTful APIs using Node.js and Express. Application Architecture & Integration: Design and implement scalable architectures and microservices that meet business needs, ensuring best practices are followed across the team. Collaborate with database engineers to design efficient database schemas and manage data interactions using MongoDB or SQL databases. Deployment & Testing: Manage deployments and ensure seamless delivery of updates using CI/CD pipelines and containerization tools like Docker. Ensure high-quality code by writing unit and integration tests, performing debugging, and optimizing application performance. Collaboration & Documentation: Work closely with designers, product managers, and other developers to deliver innovative and user-centric solutions. Create and maintain technical documentation for applications, APIs, and architectural decisions, ensuring team adherence to documentation standards. Requirements & Qualifications Experience & Education: 7+ years of professional experience in full-stack development with React and Node.js. 2+ years of experience in a team lead or senior leadership role, guiding and mentoring other developers. A Bachelor's degree in Computer Science or equivalent is preferred. Front-End Stack: Expertise in React.js, Redux, React Hooks, and component-based architecture. Strong knowledge of HTML5, CSS3, and modern JavaScript (ES6+). Familiarity with front-end tools like Webpack, Babel, or Vite. Back-End Stack: Proficiency in Node.js and Express.js for building server-side applications. Experience with API design and integration, including GraphQL (preferred) or RESTful services. Knowledge of authentication mechanisms such as OAuth, JWT, and session-based authentication. Database & DevOps: Hands-on experience with databases such as PostgreSQL or MySQL. Experience with cloud platforms such as AWS, Azure, or GCP. Familiarity with containerization tools like Docker and orchestration tools like Kubernetes is a plus. Soft Skills: Strong problem-solving and analytical skills. Excellent communication and collaboration abilities, with a proven ability to lead and motivate a team. Eagerness to stay updated on emerging technologies and trends, and to drive continuous improvement within the team. What Is Offered Compensation: Monthly compensation up to 9,000 USD gross . Contract Type: Employment Contract (Umowa o Pracę) ONLY . Please note that there is strictly no B2B option available for this position. Work Model: Hybrid (3 days working from the office located in the center of Warsaw, 2 days working from home). Stability: Long-term cooperation with a stable, international organization. Culture: We value creative problem solvers who learn fast, work well in an open and diverse environment, and enjoy pushing the bar for success ever higher. We do work hard, but we also choose to have fun while doing it.

🏢 Summary: A fully remote Full Stack Engineer role in a late-stage product company building a new engineering team in Poland. The position focuses on developing scalable, production-grade applications using TypeScript, React, and Node.js across the stack. Engineers collaborate cross-functionally to deliver end-to-end features with strong emphasis on quality, performance, and reliability. 🗂️ Requirements: Strong proficiency in TypeScript, Experience with React, Experience with Node.js or server-side TypeScript, Understanding of testing practices, Experience with CI/CD, Experience with version control, Ability to work in a collaborative, fast-paced environment 📃 Skills: TypeScript, React, Node.js, CI/CD, Git, APIs, Microservices, AWS, GCP, Azure, Testing 🏢 Description: A late-stage (Series D), well-funded product company is building a brand-new, fully-remote engineering team in Poland. We're looking for talented Full Stack Engineers who can build high-quality, scalable applications using TypeScript , React , and modern backend frameworks. You'll work closely with product, design, and other engineers to deliver features end-to-end. While financial markets experience is a plus, it is not required - strong engineering fundamentals matter more. We are open to candidates who specialize in only front-end or only back-end development, as well as true full-stack engineers. What You'll Do Design, build, and maintain production-grade applications using TypeScript across the stack. Develop intuitive, performant user interfaces using React and modern front-end tooling. Build and maintain backend services, APIs, and integrations (Node.js / TypeScript). Collaborate with product managers and designers to translate requirements into technical solutions. Write clean, testable, maintainable code with strong attention to performance and reliability. Participate in code reviews, architecture discussions, and continuous improvement initiatives. Troubleshoot issues across the stack and contribute to a culture of engineering excellence. Required Skills Strong proficiency in TypeScript . Experience with React for front-end development. Experience with Node.js , server-side TypeScript, or similar backend frameworks. Solid understanding of modern software engineering practices: testing, CI/CD, version control, code reviews. Ability to work in a fast-paced, collaborative environment. Nice to Have Experience working in financial markets , fintech, or trading systems. Familiarity with cloud platforms (AWS, GCP, Azure). Experience with microservices, event-driven architectures, or distributed systems. Exposure to data visualization libraries or real-time data applications. Experience with performance optimization on either the front-end or back-end.

🏢 Summary: Full Stack JavaScript Developer role focused on building and scaling a complex data processing and analytics platform, covering backend services, frontend applications, and large-scale data pipelines. The position involves developing RESTful APIs, microservices, and modern React applications, while optimizing databases and performance in a cloud environment. The role includes active contribution to architecture, code quality, and production support. 🗂️ Requirements: Strong experience with Node.js (v22+), Experience with Express.js, Solid knowledge of React (v16+), Experience with PostgreSQL and query optimization, Very good understanding of asynchronous JavaScript, Experience designing RESTful APIs, Knowledge of microservices architecture, Understanding of distributed systems, Experience with Jest or Mocha, Experience with Git, Experience with Webpack or Rollup, Understanding of web security best practices, Basic knowledge of AWS and cloud architecture 📃 Skills: JavaScript, Node.js, Express, React, PostgreSQL, REST, Microservices, DistributedSystems, Jest, Mocha, Git, Webpack, Rollup, AWS, SQL, Async/Await, Promises 🏢 Description: Full Stack JavaScript Developer (Node.js / React) About CRIF CRIF is an international company providing credit and business information services, data processing, and advanced decisioning solutions. We support financial institutions, insurers, utilities, and enterprises with reliable data, analytics, and secure, scalable technology platforms. WBO (White Blue Ocean) is CRIF’s personal and cyber security division focused on advanced monitoring of the Open and Dark Web. Using AI and machine learning, it identifies leaked, stolen, or exposed data and delivers proactive alerts for individuals and companies. Role Overview We are looking for an experienced Full Stack JavaScript Developer to join the WBO team and help build a complex data processing and analytics platform, covering backend services, frontend applications, and large-scale data pipelines. Key Responsibilities Design, develop, and maintain scalable backend services using Node.js Build modern, responsive web applications with React Develop and maintain RESTful APIs and microservices Implement and optimize data processing pipelines (ETL, streaming) Design and optimize PostgreSQL databases and complex queries Implement authentication and authorization mechanisms (JWT, ACL) Optimize application performance and data processing efficiency Write and maintain unit and integration tests Participate in code reviews and ensure high code quality Deploy and maintain applications in an AWS cloud environment Troubleshoot production issues and implement sustainable solutions Collaborate with the team on architecture and technical decisions Document technical solutions and API specifications Required Skills & Experience Strong experience with Node.js (v22+) and Express.js Solid knowledge of React (v16+) Experience with PostgreSQL and query optimization Very good understanding of asynchronous JavaScript (async/await, Promises) Experience designing scalable RESTful APIs Knowledge of microservices and distributed systems Familiarity with testing frameworks (Jest, Mocha) Experience working with Git and modern build tools (Webpack / Rollup) Understanding of web security best practices Basic knowledge of AWS and cloud architecture concepts Nice to Have Experience with AWS Lambda, S3, Athena, CloudWatch Docker and CI/CD pipelines (e.g. Jenkins) TypeScript, Redis, Bull, Socket.io Python or Rust for performance-critical components Experience working with and modernizing legacy systems What We Offer CONTRACT OF EMPLOYMENT Remote work model Work on large-scale, data-driven systems in an international environment Real impact on system architecture and technology decisions Modern tech stack and strong engineering culture Cooperation with experienced and supportive teams Competitive salary aligned with your experience (salary range will be shared during the first interview)

🏢 Summary: Short-term B2B contract for a Fullstack Developer (Node.js + TypeScript) to build and maintain backend services for a regulated digital capital market platform in the fintech domain. The role focuses on developing scalable APIs, integrating KYC/AML providers, and implementing authentication, authorization, and investor management features. The project emphasizes code quality, security, and collaboration with cross-functional teams. 🗂️ Requirements: 3+ years commercial experience with Node.js, Strong knowledge of TypeScript, Experience building REST APIs, Experience with NestJS or similar framework, Experience with Prisma ORM or similar ORM, Understanding of authentication and authorization, Experience with relational databases, Experience writing automated tests, Knowledge of clean code principles, English for daily communication 📃 Skills: Node.js, TypeScript, NestJS, Prisma, REST, SQL, Jest, Supertest, Authentication, Authorization 🏢 Description: Description We are a technology company that started its journey in 2008. Our main headquarters is located in the picturesque city of Poznań, nestled by the beautiful Malta lake. For more than 17 years, we have been assisting companies in developing and implementing innovative fintech solutions. Leveraging our expertise in areas such as blockchain, online payments, and more, our clients can invent and develop cutting-edge solutions and services that keep them at the forefront of innovation. FULLSTACK DEVELOPER B2B: 80-100 PLN / hour START - 1 JULY TERM - 6 WEEKS LOCATION: POLAND (REMOTE) *We offer a hybrid work model, allowing you to balance office presence with remote work. However, it's important to note that the role emphasizes a stronger presence in the office to foster teamwork and effective communication. Requirements Key Duties and Services: A Roadmap to Your Professional Success Your Mission : We are looking for a Fullstack Developer (Node. js + TypeScript) to join a fintech project focused on building a regulated digital capital market platform. The system supports investor onboarding, KYC/AML verification, investor classification, access control, audit logging, and digital wallet infrastructure. You will work closely with senior engineers and architects to build scalable backend services and integrations with fintech and blockchain-related providers. Scope of services: Developing and maintaining backend services using Node. js + TypeScript Building and extending REST APIs for onboarding, authentication, and user management Integrating external KYC/AML and identity verification providers Implementing business logic for investor classification and access control Creating and maintaining database models using Prisma ORM Writing unit and integration tests (Jest, Supertest) Participating in code reviews and technical discussions Collaborating with frontend, mobile, QA, and product teams Supporting code quality, security, and system reliability Here’s the set we are required: 3+ years of commercial experience with Node. js backend development Strong knowledge of TypeScript Experience building REST APIs and backend systems Experience with NestJS or similar frameworks Experience with Prisma ORM or similar Understanding of authentication & authorization concepts Familiarity with relational databases Experience writing automated tests (Jest, Supertest or similar) Strong understanding of clean code principles and best practices Good communication skills and English for daily cooperation Nice to have: Experience with class-validator / DTO-based validation Familiarity with GraphQL (Apollo) Experience in fintech / banking / regulated environments Knowledge of KYC/AML processes Exposure to blockchain, wallets, or digital assets Career Advancement at Your Fingertips: Explore Opportunities with Us By joining us you will get: Work on a modern fintech platform with real regulatory requirements Collaboration with experienced senior engineers and architects Opportunity to work with KYC/AML, identity systems, and fintech integrations Influence on system design and backend architecture decision A strong engineering culture focused on quality, security, and scalability Navigating the Hiring Process: What does the recruitment process for that position look like? HR Screening with Talent Acquisition Specialist (30 min) Technical Interview (60 min) Interview with Delivery Manager (30 min) Job Offer

🏢 Summary: Senior Full Stack Developer role focused on architecting and delivering high-performance web applications using React and Node.js. The position involves leading system design, building scalable front-end and back-end solutions, and overseeing cloud-based deployments and DevOps processes. The role includes technical ownership of microservices, APIs, databases, and application performance in a hybrid Warsaw-based setup. 🗂️ Requirements: 7+ years full stack development experience, 2+ years in senior or technical lead role, Expert-level React.js with Hooks and Redux, Advanced JavaScript ES6+ proficiency, Strong Node.js and Express.js experience, Experience designing REST or GraphQL APIs, Experience with OAuth, JWT, sessions, RBAC, Database design and optimization with PostgreSQL, MySQL, or MongoDB, Hands-on Docker experience, Experience with AWS, Azure, or GCP, CI/CD pipeline management experience, Proficiency with Git workflows, Bachelor’s or Master’s in Computer Science or related field 📃 Skills: React, Redux, JavaScript, HTML5, CSS3, Node.js, Express, GraphQL, REST, OAuth, JWT, RBAC, PostgreSQL, MySQL, MongoDB, Docker, Kubernetes, AWS, Azure, GCP, Git, CI/CD, Webpack, Babel, Vite 🏢 Description: 🧩 About the Company Our client is a rapidly growing US-based technology firm with global operations. With a strong commitment to innovation and quality engineering, the company is building a new engineering hub in Warsaw. This is your opportunity to join a high-performing team and play a pivotal role in developing next-generation digital solutions for the private capital markets. 📍 Location & Setup Start remotely and transition to a hybrid model based in Warsaw (3 days/week in the office in the coming months). 🧠 The Role: Senior Full Stack Developer (React & Node.js) We’re looking for an expert-level Senior Full Stack Developer with at least 7 years of professional experience in designing, architecting, and delivering high-performance web applications. You will take ownership of complex technical challenges across both the front-end and back-end, drive architectural decisions, and provide technical leadership and mentorship within the software development lifecycle. 🔧 Key Responsibilities Technical Leadership: Architect and develop scalable, responsive UIs with React.js, Redux, and modern JavaScript (ES6+). System Design: Design, build, and scale advanced server-side applications, microservices architecture, and RESTful/GraphQL APIs with Node.js and Express. Data Architecture: Lead database design, optimization, and integration strategies (PostgreSQL, MySQL, or MongoDB). Quality Assurance: Define testing strategies, write robust unit/integration tests, and establish efficient debugging protocols for the team. DevOps & Deployment: Oversee and optimize CI/CD pipelines, containerization using Docker, and cloud deployments. Agile Mentorship: Lead agile collaboration with product managers, designers, and engineers, while mentoring mid-level and junior developers. Performance: Proactively monitor system performance, identify bottlenecks, and maintain high-availability production-grade applications. Standards: Establish and maintain comprehensive technical documentation and coding standards. 📌 What We’re Looking For Front-End: Expert-level experience with React.js, Hooks, Redux, and complex component-based architecture. Deep mastery of HTML5, CSS3, and ES6+. Advanced configuration and optimization experience with build tools like Webpack, Babel, or Vite. Back-End: Senior-level proficiency in Node.js & Express.js for enterprise applications. Extensive API design and architecture experience (GraphQL highly preferred, alongside REST). Deep understanding and implementation experience with advanced security and authentication protocols: OAuth, JWT, sessions, and RBAC. Databases & DevOps: Proven experience in scaling and optimizing relational and non-relational databases (PostgreSQL, MySQL, or MongoDB). Solid hands-on experience with Docker; Kubernetes experience is highly advantageous. Demonstrated experience designing and deploying applications on cloud platforms (AWS, Azure, or GCP). Advanced proficiency with Git workflows and driving Agile/Scrum methodologies. 🎓 Qualifications Bachelor’s or Master’s in Computer Science or a related field. 7+ years of hands-on experience in full stack development. 2+ years of experience in a senior or technical lead capacity. Proven track record of architecting, deploying, and maintaining high-traffic production applications. 💡 Soft Skills Strategic, analytical thinker and highly effective problem-solver. Strong technical leadership, team collaboration, and cross-functional communication skills. Self-motivated with excellent time management and the ability to drive projects autonomously. Passion for continuous learning, adopting new technologies, and sharing knowledge with the team. 🎁 What’s Offered Competitive salary up to $6,200 USD/month. Hybrid remote role with 3 days form office in the heart of Warsaw Generous Paid Time Off (PTO). Comprehensive full benefits package. The unique chance to shape the technical foundation of a new engineering hub and lead high-impact projects. A supportive, innovation-driven work environment that values technical excellence.

🏢 Summary: Full Stack Developer role with a strong frontend focus, responsible for building scalable modern web applications using React and TypeScript while contributing to backend services in .NET. The position involves delivering end-to-end features, integrating REST APIs, and ensuring high performance across frontend and backend layers in an agile environment. 🗂️ Requirements: Completed degree in Computer Science or related technical field, Strong commercial experience with React, Strong commercial experience with TypeScript, Solid understanding of modern frontend architecture and performance optimization, Experience building scalable and maintainable web applications, Good understanding of REST APIs and backend integration, Experience with C#, Experience with .NET development, Experience working in agile development environments, Understanding of software development lifecycle 📃 Skills: React, TypeScript, C#, .NET, REST, APIs, Agile, SDLC 🏢 Description: Responsibilities We are looking for a Full Stack Developer with a strong frontend focus who wants to work on modern web applications in an international environment. You will design and develop scalable business applications, primarily using React and TypeScript , while also contributing to backend services and integrations. You collaborate closely with product owners, architects, and engineering teams to deliver end-to-end features across the full stack. Your key responsibilities include: Design, develop, and maintain modern web applications using React and TypeScript . Implement responsive, user-friendly and high-performance frontend solutions. Collaborate with backend engineers and architects to deliver end-to-end features . Develop and maintain backend services and APIs using .NET technologies. Troubleshoot , debug , and optimize application performance across frontend and backend layers. Work in an agile environment with cross-functional and international teams. Support application deployment , maintenance , and continuous improvement of systems. Contribute to technical discussions and help ensure code quality and maintainability . Benefits Motivizer Benefits Platform to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choose medical care package, meal tickets, sports cards (we have Multisport and on preferential terms, we have membership cards to one of the most popular Gyms), cinema tickets, shop vouchers, discounts and many more. Language Courses – you'll have access to a multi-language learning platform enabling you to practice your language skills and learn new ones! Regular and systematic further training opportunities - both internally and from external providers. We support your ongoing learning and development. Cooperation within an internal community is our everyday reality. We have networking events, coding challenges, and company parties for different occasions. Qualifications Completed university degree in Computer Science or a comparable technical field. Strong experience with React and TypeScript in production environments. Solid understanding of modern frontend architecture , performance , and best practices . Experience building scalable and maintainable web applications . Good understanding of REST APIs and backend integration concepts. Experience with C# and . NET development. Familiarity with agile methodologies and software development lifecycle . Fluent English and Polish communication skills and ability to work in international teams. Nice to have: Experience with MongoDB or other NoSQL databases. Knowledge of GraphQL and advanced API patterns. Exposure to Microsoft Azure and cloud - native architectures . Understanding of DevOps practices and CI/CD pipelines . Experience working in enterprise - scale or distributed systems environments . About Cluster Reply Cluster Reply is the Reply Group company specializing in consulting and system integration of Microsoft technologies. As a Microsoft partner, Cluster Reply is active in Germany, Austria and Switzerland and works within the Reply network with sister companies in Brazil, Great Britain, Italy as well as the USA. The company focuses on innovation and supports customers in their digital transformation. The solutions range from on-premises to cloud applications in the areas of modern workplace and security, business applications, applications and infrastructure as well as data and artificial intelligence.

🏢 Summary: Long-term opportunity for a Middle/Senior Full Stack Developer to design, develop, and optimize a live educational platform using Node.js and React.js. The role covers both frontend and backend development, system architecture, integrations, and DevOps within a mature product continuously enhanced for performance and security. 🗂️ Requirements: 4+ years of professional software development experience, 4+ years of hands-on JavaScript frontend development, Strong knowledge of React.js, Strong knowledge of Node.js, Strong knowledge of NestJS, Experience with PHP, Experience with AWS, Experience with Docker, Experience with MySQL, Confident use of Git 📃 Skills: JavaScript, React.js, Node.js, NestJS, PHP, AWS, Docker, MySQL, Git, Salesforce, Contentful, Kubernetes, GraphQL, Jenkins, CI/CD 🏢 Description: Project overview The project is live and has been actively developed for over 5 years, with continuous feature enhancements and security improvements. All development is carried out on our side. Our client is a US‑based nonprofit organization developing an educational platform that supports students in learning computer science and building coding projects. The platform provides curriculum materials, teaching tools, progress tracking, collaboration features, and portfolio‑building capabilities. The mission of the platform is to help close the gender gap in the tech industry. Position overview We are looking for a Strong Middle/Senior Full Stack Developer (Node.js + React.js) to join our dynamic team. You will be involved in the design, development, and optimization of both frontend and backend functionality, working closely with a cross‑functional team on a long‑term product. Responsibilities Develop and maintain platform features using Node.js, React.js, and NestJS Participate in system design, architecture discussions, and technical decision‑making Improve platform performance, scalability, and security Implement integrations with third‑party systems (e.g., Salesforce, Contentful) Work closely with product managers, designers, and QA to deliver high‑quality features Write clean, maintainable, and well‑tested code Participate in code reviews and provide constructive feedback to the team Contribute to DevOps processes using AWS, Docker, and CI/CD tools Troubleshoot, debug, and resolve technical issues in both frontend and backend components Support continuous enhancement and modernization of the long‑running project Requirements 4+ years of professional software development experience 4+ years of hands‑on experience with JavaScript for frontend development Strong knowledge of: React.js, Node.js, NestJS Experience with PHP Experience working with AWS and Docker Experience with MySQL Confident use of Git Nice to have Solid understanding of Kubernetes Experience with GraphQL Familiarity with Jenkins and CI/CD automation Experience integrating with Salesforce and Contentful 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.)