Senior React Native Developer

🏢 Summary: Product Owner role responsible for translating product vision into clear, testable user stories and leading agile delivery for a US-based client. The position focuses on backlog management, sprint execution, stakeholder collaboration, and data-driven product decisions. You will bridge business needs and technical teams to ensure high-quality, customer-focused software delivery. 🗂️ Requirements: Proven experience as Product Owner in software development environment, Strong knowledge of Agile principles and SAFe framework, Hands-on experience with backlog management and sprint planning, Ability to write clear, testable user stories and acceptance criteria, Experience defining and tracking KPIs and product metrics, Experience leading requirements workshops and backlog refinement, Proficiency with Jira or similar agile management tools, Advanced English (C1), Polish language proficiency (B2/C1) 📃 Skills: Agile, SAFe, Scrum, Jira, KPIs, ROI, Backlog, UserStories, PIPlanning, English, Polish 🏢 Description: We don’t follow best practices, we set them! Callstack supports and inspires top industry leaders to ship better digital products and services to their users. We are a team of high-level experts in cross-platform development and consultancy. We co-create the technology, collaborate with the Meta team on setting the direction for the future growth of the React Native framework, and much more! We are recognized in the React Native Community as contributors to Open Source projects , organizers of React Universe Conf , as well as speakers at international conferences. We also organize regular community meetups in our HQ in Wrocław, Poland. We truly believe that you can get the best out of people when you give them a chance to participate and develop. At Callstack you are the one to decide in which area you want to grow, you’ll have an individual self-development budget to empower your competencies and gain new skills. Our goal is to allow every employee to speak up and introduce their ideas to build the future together. Join us and work with the TOP Silicon Valley and Fortune 500 companies in the USA! We're looking for a Product Owner to translate product vision into actionable, high-quality user stories for development teams. In this role you will be the voice of the customer, bridging the gap between stakeholder expectations and technical execution. You'll collaborate directly with our US‑based client, operating within US adaptive hours (Monday - Friday 12:00–20:00 CET) , and champion both project delivery and agile execution. As a Product Owner you will: Write clear, comprehensive user stories with detailed acceptance criteria, user journeys, and relevant design and architectural specifications. Define and uphold a strict Definition of Ready (DoR) and Definition of Done (DoD) to ensure clarity and the highest quality throughout the development lifecycle. Prepare and lead engaging Sprint Demos for stakeholders, showcasing the team's achievements and gathering valuable feedback. Act as the final gatekeeper for sprint deliverables , signing off on user stories and bugs to confirm they meet all acceptance criteria. Embrace a data-driven approach by defining success metrics (KPIs, ROI) and aligning with stakeholders on product impact goals. Lead requirements gathering workshops (Inspect Phase) with technical experts and stakeholders to elicit business needs and mitigate gaps. Conduct backlog refinement sessions , breaking down epics into manageable, well-defined stories and mapping all dependencies. Collaborate closely with the Scrum Master and development team during PI Planning and throughout sprints to manage priorities, resolve blockers, and ensure a high story completion rate. Champion a customer-focused mindset , deeply understanding user pain points and ensuring they are addressed in the product backlog. You are the right candidate if you have: Proven professional experience as a Product Owner , ideally in a software development or corporate environment. Exceptional communication skills , with the ability to work effectively with cross-functional teams and stakeholders. Deep understanding of Agile principles and frameworks (SAFe) , with hands-on experience in backlog management, refinement, and sprint planning. A strong analytical and data-driven mindset , with experience in defining and tracking product KPIs. A genuine passion for understanding customer needs and translating them into functional product requirements. Demonstrated ability to write clear, concise, and testable user stories and acceptance criteria. Proactive, curious, and adaptable , with a continuous learning attitude in a fast-paced setting. Experience with agile management tools such as Jira. Strong command of business English language (C1), both written and verbal. Ability to communicate in Polish language (B2/C1). Independence and proactiveness in daily work. Nice to have: Professional Scrum Product Owner (PSPO) or Certified Scrum Product Owner (CSPO) certification. Experience working directly with end-users and conducting user research. A background in business analysis or a related field. What we offer: 24 paid days off & 30 days paid sick leave for B2B contractors Fully-covered life insurance Private healthcare for you and your family Free access to mental health platform - Helping Hand Multisport Card or monthly allowance for other sports activities Individual Wellbeing & Development Budget Monthly lunch allowance Flexible working hours and the possibility of remote work Accounting costs refund for B2B contractors Cool office in Wrocław city center Magnificent team events and activities Company-wide workation and team building workshops Top-notch hardware - Apple devices

🏢 Summary: Mid-level Full-stack Developer role focused on building and maintaining web and mobile applications using React and .NET technologies. The position involves developing scalable backend services, microservices, and SEO-friendly frontends integrated with CMS, within a multinational Agile environment. The role combines frontend, backend, cloud, and DevOps responsibilities with regular team collaboration. 🗂️ Requirements: 2–4 years experience as FullStack Developer, .NET 8/10 proficiency, C# proficiency, Strong React knowledge, JavaScript proficiency, TypeScript proficiency, HTML5 knowledge, CSS3 knowledge, Experience with RESTful APIs, Experience with Git, Experience with Microsoft Azure (Functions, Durable Functions, CosmosDB, ServiceBus, Application Insights), Experience with CI/CD pipelines, Experience with Agile methodologies, Communicative English (B2+) 📃 Skills: .NET, C#, React, JavaScript, TypeScript, HTML5, CSS3, REST, Git, Azure, Functions, CosmosDB, ServiceBus, ApplicationInsights, CI/CD, ReactNative, Expo, Sanity, GROQ, Redux, RxJS, Tanstack, Sentry, Firebase, Analytics 🏢 Description: Join Our Team as a Full-stack Developer (React, C#)! We are seeking a talented Mid FullStack Developer proficient in .NET and React to join our team. As part of our company culture, we value collaboration and regular in-person interactions. Our team meets every two months in our Poznań office for informal gatherings to connect, share ideas, and strengthen teamwork in a relaxed setting. You will work in multinational environment and will be responsible for designing and implementing software solutions, utilizing both front-end and back-end technologies. This role requires strong problem-solving skills, excellent communication abilities, and a passion for delivering high-quality code. Ready to take the next step in your career? Apply now and join us! Key Responsibilities: • Design and develop SEO-friendly web application, based on React and TypeScript and integrated with Sanity CMS. • Contributing to a mobile application using React Native, TypeScript and Expo . • Build and maintain microservices to enhance the web experience, including features like roadside assistance, car repair bookings, and membership management. • Develop robust and scalable backend systems using .NET 8/10, Azure ServiceBus, Functions, CosmosDB and more. • Utilize Sentry for error monitoring and Google Analytics/Firebase to track user behaviour and optimize performance. Requirements : Proven experience (2-4 years) as a FullStack Developer Proficiency in .NET (preferably .NET 8/10), C# Strong understanding of front-end technologies, including React, JavaScript, TypeScript, HTML5, and CSS3 Practical knowledge of clean-code principles and patterns, drive to write clean, testable and maintainable code Experience with RESTful APIs and Web Services Knowledge of version control systems, such as Git Excellent problem-solving and analytical skills Familiarity with Microsoft Azure platform (Functions and Durable Functions, CosmosDb, ServiceBus, Application Insights) Experience with DevOps approach and CI/CD pipelines Strong communication and interpersonal skills, communicative English (B2+) Experience with Agile development methodologies Nice to have: Experience in working with Sanity CMS and GROQ query language (or any other headless CMS) Familiarity with Figma or similar tools At least basic knowledge about Server Side Rendering and libraries like: Redux, RxJS, Tanstack Experience in working with mobile apps and practical knowledge of React Native, Expo, Expo Application Services Knowledge of microservices architecture and software integration patterns We offer: Conference/workshop budget of approximately 10000 PLN!- the budget renews every year and can be used for conferences, workshops, training programs, certifications, studies, or other development initiatives. "Fabresikowe": one-time 1000 PLN bonus to create your work space more comfortable and more tailored to your needs! Relaxing office massages In-house trainings Team events Frequent company events Free breakfast every day Free beverages, fresh fruit, snacks Chill out room English and Norwegian classes

🏢 Summary: Senior React Native Developer role focused on delivering end-to-end mobile applications using React Native and Expo, with responsibility for architecture, API integration, and technical leadership. The position involves driving technical decisions, ensuring code quality, and collaborating with clients and teams to build scalable enterprise mobile solutions. 🗂️ Requirements: Advanced English proficiency, Proven experience developing mobile applications with React Native, Practical experience with Expo, Experience integrating REST or GraphQL APIs, Experience in technical leadership or mentoring, Experience with debugging and monitoring tools, Understanding of scalability and code quality principles, Ability to translate business requirements into technical solutions 📃 Skills: React, ReactNative, Expo, REST, GraphQL, CI/CD, Monitoring, Logging, APIs, Mobile 🏢 Description: 🌍 Hello World! We are The Codest -  International Tech Software Company with tech hubs in Poland delivering global IT solutions and projects. Our core values lie in “Customers and People First” approach that prioritises the needs of our customers and a collaborative environment for our employees, enabling us to deliver exceptional products and services. Our expertise centers on web development, cloud engineering, DevOps and quality. After many years of developing our own product - Yieldbird, which was honored as a laureate of the prestigious Top25 Deloitte awards, we arrived at our mission: to help tech companies build impactful product and scale their IT teams through boosting IT delivery performance. Through our extensive experience with product development challenges, we have become experts in building digital products and scaling IT teams. But our journey does not end here - we want to continue our growth. If you’re goal-driven and looking for new opportunities, join our team! What awaits you is an enriching and collaborative environment that fosters your growth at every step. 💡 Project Description: We’re seeking a seasoned Senior React Native Developer with strong experience in React Native and Expo, who is ready to step into a technical leadership role on mobile projects. In this position, you’ll be responsible for delivering end-to-end mobile applications, shaping architectural decisions, integrating with existing APIs, and supporting the team in building high-quality solutions. 📈 Your Responsibilities : Build and mantain mobile applications using React Native and Expo Integrate mobile frontends with existing APIs and backend services Partner with internal teams and clients to ensure solutions align with business objectives Drive technical planning, analysis, and execution across development work Support the team through code reviews and knowledge sharing, raising engineering quality Collaborate on delivering scalable, maintainable, and observable enterprise solutions Serve as the primary contact for technical topics within the project 🔑 Key Requirements: Advanced English in speaking and writing (you will be working in an international team) Solid track record of developing mobile apps with React Native Practical experience working with Expo Strong background in integrating with REST and/or GraphQL APIs Experience guiding others or contributing in a mentoring / technical leadership capacity Familiarity with debugging and monitoring tools Good understanding of scalability, maintainability, and overall code quality Ability to work with clients and translate business requirements into technical solutions ➕ Nice to have: Background in building or contributing to enterprise-scale applications Familiarity with setting up or working with mobile CI/CD processes Experience using observability solutions, including logging and monitoring tools 📜 Our Promise (what you can expect from us): 17-22k PLN monthly on B2B contract 100% remote work (but we have offices in Krakow and Warsaw and we’re happy to meet there from time to time 😉) 300 PLN to use on our benefits platform, Worksmile - gift cards, medical services, sports, etc. Our B2B contract contains provisions that allow you to obtain IP BOX support Integration events, education opportunities and much more… A unique opportunity to take your career to the next level - we’re looking for people who want to create an impact. You have ideas, we want to hear them! 📌 Recruitment process: 30 minute screening call online with our recruiter 1h technical call with our developer 30 minute conversation with the team leader on client side 30 minute English language check Final 1h technical call Offer Questions, insights? Feel free to reach out to our recruiting team: ewa.szczodrak@thecodest.co In the meantime, feel free to visit our website where you can find key facts about us.

🏢 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: Senior Fullstack (React + Node.js) Developer role focused on building and enhancing a complex iGaming platform using modern web technologies. The position involves developing new features, integrating third-party APIs, and ensuring scalability, performance, and code quality within a microservices-based architecture. Office presence in Łódź or Wrocław is required. 🗂️ Requirements: Knowledge of JavaScript and ECMAScript 6, 3+ years commercial experience with React, 3+ years commercial experience with Node.js, 3+ years commercial experience with Nest.js, 5+ years commercial experience in web development, Experience with high-load SQL or NoSQL databases, Experience implementing REST, GraphQL and WebSockets, Understanding of TDD principles and writing tests, Understanding of microservices architecture, Experience with GIT, Experience with RabbitMQ, Experience with Redis, Ability to work from office in Łódź or Wrocław 5 days per week 📃 Skills: JavaScript, ECMAScript6, React, Node.js, Nest.js, SQL, NoSQL, REST, GraphQL, WebSockets, TDD, Microservices, GIT, RabbitMQ, Redis 🏢 Description: We are looking for a Senior Fullstack (React + Node.js) Developer to join our team in developing a complex iGaming platform using the latest web development technologies. If you're a self-starter with solid architecture, design, coding, testing, and debugging skills, we'd love to hear from you! Please note that office work 5 days from the EPAM office in Łódź, Wroclaw is required. Responsibilities Develop the in-house iGaming platform Integrate 3rd party APIs Create new features from inception Collaborate with cross-functional teams for high-quality solutions Ensure platform scalability and performance Maintain code quality through testing and debugging Contribute to architectural and design decisions Enhance and support existing platform components Requirements Knowledge of JavaScript and ECMAScript 6 standards 3+ years commercial experience in React, Node.js and Nest.js 5+ years commercial experience in web development Background in high loaded SQL or NoSQL databases Implementation of REST, GraphQL and WebSockets Understanding of TDD principles and test writing Familiarity with microservice architecture principles Skills in GIT, RabbitMQ and Redis Nice to have 2+ years hands-on background developing over CI/CD, Microservices architecture or Containers Familiarity with Kubernetes, Nats or TypeScript We offer/Benefits We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

🏢 Summary: Hybrid React Developer role focused on building responsive, high-performance user interfaces and rapidly prototyping new features with strong emphasis on UX. The position involves close collaboration with product and design teams and integration of RESTful APIs to deliver seamless end-to-end functionality. Requires regular on-site presence in Kraków once per week. 🗂️ Requirements: Advanced English (min. B2), Experience with React.js development, Ability to build responsive, high-performance user interfaces, Experience integrating RESTful APIs and backend services, Proficiency in modern CSS and JavaScript best practices, Experience using design tools (Figma or Sketch), Ability to work from Kraków office once per week 📃 Skills: React, JavaScript, CSS, REST, API, Figma, Sketch, UX 🏢 Description: 🌍 Hello World! We are The Codest -  International Tech Software Company with tech hubs in Poland delivering global IT solutions and projects. Our core values lie in “Customers and People First” approach that prioritises the needs of our customers and a collaborative environment for our employees, enabling us to deliver exceptional products and services. Our expertise centers on web development, cloud engineering, DevOps and quality. After many years of developing our own product - Yieldbird, which was honored as a laureate of the prestigious Top25 Deloitte awards, we arrived at our mission: to help tech companies build impactful product and scale their IT teams through boosting IT delivery performance. Through our extensive experience with product development challenges, we have become experts in building digital products and scaling IT teams. But our journey does not end here - we want to continue our growth. If you’re goal-driven and looking for new opportunities, join our team! What awaits you is an enriching and collaborative environment that fosters your growth at every step. We are looking for an experienced React Developer . Please note: this is a hybrid position, you will be expected to come into the office 1 day per week (the office is located in Kraków). 📈 Your Responsibilities : Build responsive user interfaces with React.js Rapidly prototype new features with a focus on UX design Collaborate with product and design teams to refine user experience Integrate APIs and backend services Apply modern CSS and JavaScript best practices Utilize design tools for wireframes and mockups 🔑 Key Requirements: Advanced English in speaking and writing Develop and maintain responsive, high-performance user interfaces using React.js Rapidly prototype new features and iterate based on user feedback, with a strong focus on UX quality Work closely with product managers and designers to translate requirements into intuitive user experiences Integrate RESTful APIs and backend services to deliver seamless end-to-end functionality Write clean, maintainable code following modern CSS and JavaScript best practices Use design tools (e.g., Figma, Sketch) to create and review wireframes and mockups before implementation Excellent communication skills in English (min. B2 level) 1x a week working from the office in Krakow 📜 Our Promise (what you can expect from us): 18-22k PLN on B2B Hybrid work (1x per week from the office in Kraków) 300 PLN to use on our benefits platform, Worksmile - gift cards, medical services, sports, etc. Our B2B contract contains provisions that allow you to obtain IP BOX support Integration events, education opportunities and much more… A unique opportunity to take your career to the next level - we’re looking for people who want to create an impact. You have ideas, we want to hear them! 📌 Recruitment process: 30 minute screening call online with our recruiter - Justyna 1 hour screening technical interview 1 hour call with the client Offer Questions, insights? Feel free to reach out to our recruiting team: justyna.pazdalska@thecodest.co In the meantime, feel free to visit our website where you can find key facts about us.

🏢 Summary: Senior Fullstack Developer role focused on building and scaling a complex iGaming platform using React and Node.js. The position involves developing new features, integrating third-party APIs, and contributing to architectural decisions within a microservices-based environment. The role requires strong experience in high-load systems and modern web technologies. 🗂️ Requirements: 5+ years commercial experience in web development, 3+ years commercial experience with React, 3+ years commercial experience with Node.js, 3+ years commercial experience with Nest.js, Strong knowledge of JavaScript and ECMAScript6, Experience with high-load SQL or NoSQL databases, Experience implementing REST, GraphQL and WebSockets, Understanding of TDD and test writing, Knowledge of microservices architecture, Experience with Git, Experience with RabbitMQ, Experience with Redis 📃 Skills: JavaScript, ECMAScript6, React, Node.js, Nest.js, SQL, NoSQL, REST, GraphQL, WebSockets, TDD, Git, RabbitMQ, Redis, Microservices 🏢 Description: We are looking for a Senior Fullstack (React + Node.js) Developer to join our team in developing a complex iGaming platform using the latest web development technologies. If you're a self-starter with solid architecture, design, coding, testing, and debugging skills, we'd love to hear from you! Please note that office work 5 days from the EPAM office in Krakow, Gdansk, Wroclaw, Katowice or Poznan is required. Responsibilities Develop the in-house iGaming platform Integrate 3rd party APIs Create new features from inception Collaborate with cross-functional teams for high-quality solutions Ensure platform scalability and performance Maintain code quality through testing and debugging Contribute to architectural and design decisions Enhance and support existing platform components Requirements Knowledge of JavaScript and ECMAScript 6 standards 3+ years commercial experience in React, Node.js and Nest.js 5+ years commercial experience in web development Background in high loaded SQL or NoSQL databases Implementation of REST, GraphQL and WebSockets Understanding of TDD principles and test writing Familiarity with microservice architecture principles Skills in GIT, RabbitMQ and Redis Nice to have 2+ years hands-on background developing over CI/CD, Microservices architecture or Containers Familiarity with Kubernetes, Nats or TypeScript We offer/Benefits We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

🏢 Summary: Senior React Native Developer role focused on building and evolving a large-scale, multi-module mobile platform used by millions of users across Europe and North America. The position involves driving architectural decisions, developing complex mobile applications in React Native and TypeScript, and mentoring engineers while ensuring high performance and scalability. You will collaborate cross-functionally and contribute to CI/CD, native integrations, and continuous technical improvements. 🗂️ Requirements: 5+ years commercial software development experience, 4+ years experience with React Native, Experience building and maintaining large-scale mobile applications, Strong knowledge of TypeScript and modern JavaScript, Experience with React Hooks, Understanding of modular and multi-module architecture, Experience with MobX, Experience with React Query (TanStack Query), Knowledge of native mobile development concepts for iOS and Android, Experience integrating REST APIs, Experience with GraphQL, Experience with form management solutions, English proficiency at B2 level or higher, Polish proficiency at B2 level or higher, Residence in Poland 📃 Skills: React, ReactNative, TypeScript, JavaScript, MobX, ReactQuery, TanStackQuery, iOS, Android, REST, GraphQL, CI/CD, Firebase 🏢 Description: Join one of Europe's largest mobile platforms, delivering digital services used by millions of users across multiple countries in Europe and North America. Built on a multi-module architecture, the platform enables rapid product development, high code reusability, and continuous expansion into new business areas. As a Senior React Native Developer, you will play a key role in shaping the architecture of a big mobile ecosystem, driving technical decisions, mentoring other engineers, and delivering high-quality solutions at scale. Your tasks Design, develop, and maintain complex mobile applications using React Native and TypeScript Drive architectural decisions and contribute to the evolution of our multi-module platform Lead technical discussions and participate in solution design Review code, mentor team members, and promote engineering best practices Collaborate closely with Product Owners, UX Designers, Backend Engineers, QA Engineers, and Architects Improve application performance, reliability, scalability, and maintainability Contribute to CI/CD processes and development tooling Support the integration of native mobile capabilities and third-party services Identify technical debt and proactively drive improvements across the codebase Requirements At least 5 years of commercial software development experience, including at least 4 years with React Native Proven track record of building and maintaining large-scale mobile applications Strong expertise in TypeScript, modern JavaScript, and React Hooks Solid understanding of modular and multi-module application architecture Hands-on experience with MobX and React Query (TanStack Query) Knowledge of native mobile development concepts and creating native modules for iOS and Android Practical experience with REST APIs, GraphQL, and form management solutions English and Polish proficiency at the B2 level or higher Residing in Poland required Nice-to-have requirements Payment integrations and mobile wallet solutions Geolocation and location-based services Firebase services and analytics Mobile security best practices Observability and monitoring tools Background in large-scale international products Agile delivery experience (Scrum/Kanban) What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: B2B contract for a Senior React Native Developer to build and maintain a white-label, multi-tenant mobile ordering platform for iOS and Android. The role focuses on developing scalable, production-grade applications with advanced mobile features and clean architecture. Initial 4-month engagement with possible extension, starting in June. 🗂️ Requirements: Minimum 3 years commercial experience with React Native and shipped production apps, Strong TypeScript skills including strict mode, generics, utility types, Deep knowledge of React Navigation and complex navigation patterns, Experience with React Native Reanimated (v2+) and gesture-based interactions, Solid knowledge of iOS and Android build systems (Gradle, Xcode, signing, schemes/flavours), Experience debugging native crashes and JS bundle issues, Proficiency with TanStack Query (or React Query), Experience with Zustand or similar state management, Ability to design and maintain typed API clients and data-fetching layer, Experience with modular or feature-based architecture, English level B2 or higher, Experience working in Agile/Scrum environments 📃 Skills: ReactNative, TypeScript, ReactNavigation, Reanimated, Zustand, TanStackQuery, iOS, Android, Gradle, Xcode, JavaScript, Scrum 🏢 Description: We are looking for an experienced Senior React Developer to join the team working on a white-label mobile ordering platform for restaurants. The product is built as a shared, multi-tenant solution, where each client receives their own fully branded mobile application powered by a common codebase. Who we are: We are Inspeerity (part of DevelopX group), engineering consultancy providing software development and consultancy. Our primary expertise is systems architecture and full stack development – from defining project requirements, to designing, building, and deploying software applications for web, backend, enterprise and mobile. We are crazy about technology, serious about people. TL;DR • Who : Senior React Native Developer • Contract Type : B2B • Salary range: Up to 150 PLN/h + VAT • Start date : from ~9th June • Term of the agreement : ~ 4 months with possibility of prolongation What you’ll be doing: Developing and maintaining production-grade mobile applications in React Native for iOS and Android platforms. Designing and implementing scalable, maintainable, and modular application architecture within a multi-tenant / white-label environment. Building advanced mobile features using TypeScript, React Navigation, Reanimated, and gesture-based interactions. Managing application state, server communication, caching, and API integrations using TanStack Query, Zustand, and typed API clients. Ensuring high code quality through clean architecture, reusable components, strong naming conventions, and maintainable code practices. Participating in agile development processes, including sprint planning, reviews, demos, and close collaboration with international stakeholders. Presenting delivered features during sprint reviews and proactively suggesting product and technical improvements. Supporting the QA process during regression testing and contributing to overall product stability and performance. You will be the best fit if you have: At least 3 years of commercial React Native experience with shipped production apps. Strong TypeScript skills - strict mode, generics, utility types. Deep understanding of React Navigation and complex navigation patterns. Experience with React Native Reanimated (v2+) and gesture-based interactions. Solid knowledge of iOS and Android build systems (schemes/flavours, signing, Gradle, Xcode). Experience debugging native crashes, JS bundle issues. Proficiency with TanStack Query (or React Query). Experience with Zustand or comparable lightweight state management. Ability to design and maintain a clean data-fetching layer with typed API clients. Experience working in a feature-based or modular architecture. Comfortable presenting your own work to stakeholders every two weeks. Proactive mindset: expected to raise observations, propose improvements, and drive initiatives - not just execute tickets. Strong problem-solving and debugging skills. English level B2 or higher. Hands-on experience working in Agile / Scrum environments. What we offer: Hybrid and flexible cooperation model based on a B2B contract. Remote work or working from our Bialystok, Warsaw, Rzeszow offices. It's up to you! Great working conditions and best equipment. Collaboration with experienced and engaged people who will appreciate your work and support you whenever you need it.

🏢 Summary: Senior Fullstack Developer role focused on extending a HubSpot-based CRM with new frontend, backend, and integration functionalities in a fully remote setup. The position involves building custom modules, managing license and trial features, and ensuring reliable integrations between internal and external systems. The developer will take ownership of data flows, webhooks, and system reliability within a small cross-functional team. 🗂️ Requirements: Minimum 5 years of experience as Fullstack Developer, Strong knowledge of React, Strong knowledge of TypeScript, Solid experience with Node.js, Experience with API development, Hands-on experience with webhooks, Experience with system integrations, Ability to extend existing backend codebases, Experience with AI-assisted coding tools, English C1 level, Polish B2 level 📃 Skills: React, TypeScript, Node.js, APIs, Webhooks, HubSpot, CRM, LMS, Authentication, Integrations, Monitoring, Observability, Claude 🏢 Description: Senior Fullstack Developer (React / Node.js) – Fully Remote Location: Fully remote Working hours: 10:00–18:00 (UK time), no travel required Rate: PLN 120–160 / hour Project duration: Initial 2 months, extension very likely Client: International financial institution Process: 2 interview stages Team: 2 Developers, Project Manager, Architect About the Role We are looking for an experienced Senior Fullstack Developer to join a small, cross-functional team working on the expansion of an existing CRM system. The project focuses on extending a HubSpot-based solution with new frontend, backend, and integration functionalities. You will play a key role in designing and building a new custom HubSpot application for internal users, developing license and trial management features, and integrating multiple internal and external systems. The role combines hands-on development with ownership of integrations and data flow reliability. Responsibilities Design and develop a new custom module within an existing HubSpot application Build user-facing interfaces for internal HubSpot users Implement a management panel for customer trials and licenses Integrate the application with existing internal APIs Identify and implement missing backend functionalities Develop integration code in Node.js connecting LMS webhooks with the authentication system Automate user account creation based on LMS-triggered events Automate user roles and permissions assignment based on learning system data Ensure data consistency, reliability, and observability across systems Handle error management, retries, and monitoring of webhook-based flows Requirements Minimum 5 years of professional experience as a Fullstack Developer Very strong knowledge of React and TypeScript Solid experience with Node.js and API development Hands-on experience with webhooks and system integrations Ability to read, understand, and extend existing backend codebases Practical experience using Claude Code or similar AI-assisted coding tools English proficiency at C1 level (daily collaboration with international clients) Polish proficiency at B2 level or higher (internal team communication) What We Offer Fully remote work Competitive hourly rate: PLN 120–160 Sports card (Multisport or equivalent) Private medical healthcare Access to learning and training platforms Small, experienced team with a clear technical direction High likelihood of project extension after 2 months