Tech Lead

🏢 Summary: Senior Front-End Tech / Team Lead role focused on building scalable, enterprise-grade applications using React and TypeScript while leading a development team. Combines hands-on frontend engineering with architectural decision-making, code quality ownership, and technical mentorship. Involves working within Agile processes to deliver high-quality, secure, and maintainable solutions. 🗂️ Requirements: Senior or Lead-level frontend development experience, Proven experience leading technical teams, Strong expertise in React and TypeScript, Experience with Redux and RTK Query, Experience with relational and NoSQL databases, Experience with containerization and orchestration tools, Experience with CI/CD and Git-based workflows, Knowledge of unit and integration testing frameworks, Experience working in Agile environments, Ability to translate business requirements into technical solutions 📃 Skills: React, TypeScript, Redux, RTKQuery, HTML5, CSS3, Tailwind, PostgreSQL, MongoDB, SQLServer, RabbitMQ, Redis, Auth0, Kubernetes, Docker, Git, GitLab, Azure, Jest, Mocha, JUnit, NUnit, SCORM, xAPI, LTI, MSGraphAPI, ZoomSDK, WCAG 🏢 Description: Key Role Objectives The Front-End Tech / Team Lead role combines deep technical expertise with leadership responsibilities, ensuring high quality code delivery while mentoring and guiding the development team, help make architectural decisions, and build scalable and enterprise solutions. Key Details Location: [Krakow – preferred] Employment Type: [B2B] Experience Level: [ Senior / Lead] Key Requirements   |   Technical Frontend: React 18 with Typescript, Redux, RTK Query, HTML5, CSS3, Tailwind Databases: PostgreSQL, MongoDB, SQL Server Other Third Party: RabbitMQ, Redis, Auth0 DevOps: K8s, Docker, Git (GitLab), Azure Testing: Unit and integration testing frameworks (e.g., Jest, Mocha, Junit, NUnit) Bonus: LTI standards, SCORM/xAPI, or real-time systems (e.g., live quizzes, video classrooms) Key Requirements | Leadership Proven experience in a lead or senior role guiding technical teams Team communication skills and experience working in Agile environments Strong stakeholder management skills and ability to interpret and evaluate business goals Ability to translate business goals into technical execution plans Key Responsibilities | Technical Develop, test and maintain robust and stable services and applications using your language of expertise Follow the mandatory standards and conventions, including technical and behavioural, defined for the project Read and follow the architectural product documentation in decision-making process and implementation Ensure high quality and correctness of the changes produced by your teammates through meticulous code reviews Cover your produced code with effective unit tests and ensure sufficient level of coverage Follow the product non-functional requirements, including performance, security, maintainability, and scalability Participate in architectural decisions; contribute to technical strategy and documentation Keep abreast and informed about the latest technological improvements, be curious and proactive to apply the best technologies and practices to the project being developed Key Responsibilities | Leadership Lead a l team of developers through agile sprints and project lifecycles Mentor junior and mid-level engineers, foster a culture of collaboration and innovation and promote best practices Communicate and ensure processes, standards and conventions established for the project Collaborate with Product Managers, UX/UI Designers and QA teams, to align tech solutions with business goals Translate product requirements into technical deliverables that meet business requirements and deadlines Drive continuous improvement in processes, architecture, and team culture Own and manage technical debt, refactoring, and system improvements Nice to Haves Prior experience in the EdTech domain (e-learning platforms, digital classrooms, LMS) Knowledge of learning science, instructional design, or accessibility standards (e.g., WCAG) Familiarity with MS Graph API, Auth0 API, Zoom SDK, LTI, Clever

🏢 Summary: Backend Tech Lead role focused on leading and implementing a strategic rewrite of a core financial platform module into a modern, scalable architecture. The position combines hands-on Java/Spring Boot development with architectural decision-making, API design, and integration across multiple enterprise banking systems. It involves designing high-performance backend services handling large transactional and reporting datasets. 🗂️ Requirements: 7+ years backend or fullstack development experience, Strong Java expertise, Strong Spring Boot expertise, Experience designing REST APIs, Experience as Tech Lead or technical owner, Experience designing scalable and distributed systems, Strong relational database design skills (PostgreSQL), Experience with Elasticsearch or similar search technology, Experience integrating external systems via REST or GraphQL, Experience with Docker and Kubernetes, Experience with CI/CD pipelines, Knowledge of OAuth2 and OIDC, Working knowledge of React, Working knowledge of TypeScript, Experience handling large datasets with complex queries, Ability to lead architecture and mentor developers 📃 Skills: Java, Spring, SpringBoot, REST, GraphQL, PostgreSQL, Elasticsearch, Docker, Kubernetes, CI/CD, OAuth2, OIDC, React, TypeScript, SQL, Microservices, DistributedSystems 🏢 Description: Our client is an international financial technology company building solutions that support transaction communication, balances visibility, reporting, and integrations across multiple banking systems . We are looking for a Backend Tech Lead to join a strategic rewrite of a core platform module. The role combines technical leadership with hands-on backend development , helping redesign a legacy component into a modern, scalable architecture. You will work closely with product stakeholders, platform engineers, and frontend teams to design and implement reliable, high-performance backend services that integrate multiple enterprise systems. IN SHORT: 🌍 Remote work or on-site (Wrocław, Bielsko-Biała) – your choice! 💰 170 - 190 PLN/h + VAT ☑️ B2B contract Your Daily Missions Lead the design and development of backend services for a core platform rewrite. Design scalable services responsible for transactions, balances, statements, and reporting data . Define API contracts and integration patterns between backend services, frontend applications, and external enterprise systems. Make key decisions around data modeling, search/indexing strategies, and performance optimization for million-row datasets with complex filtering, sorting, and pagination . Support frontend teams by ensuring API-first design and smooth integration with React applications . Ensure engineering quality through code reviews, architecture discussions, and mentoring other developers . Collaborate closely with product, frontend, and platform teams to deliver robust, production-ready systems . The Essentials We're Seeking 7+ years of experience in backend or fullstack software development. Strong expertise in Java and Spring Boot , including designing modular backend services and REST APIs. Experience acting as a Tech Lead or technical owner responsible for architectural decisions. Solid experience designing scalable APIs and distributed systems . Strong understanding of data modeling in relational databases (e.g., PostgreSQL) and designing efficient query patterns. Practical experience with Elasticsearch (or similar search/indexing technologies) for filtering, search, and aggregation over large datasets. Experience designing hybrid data architectures combining multiple data sources . Experience working with external system integrations , including REST or GraphQL APIs. Familiarity with containerized environments (Docker, Kubernetes) and modern CI/CD pipelines. Understanding of security patterns in enterprise systems (OAuth2, OIDC, authentication and authorization flows). Working knowledge of React and TypeScript , enabling effective collaboration with frontend teams. Proven ability to break down complex architectural changes into manageable development phases . Experience using AI-assisted development tools (e.g., Cursor, Claude Code, or similar agentic coding tools) and openness to experimenting with AI-driven approaches to improve development efficiency and engineering workflows . Ability to combine hands-on engineering with technical leadership and mentoring . Nice-to-Haves Experience in FinTech, banking, or enterprise integration platforms . Experience with large-scale transactional or reporting systems . Experience with GraphQL integrations . Experience with data migration or legacy system modernization . Experience designing API-first platforms . Familiarity with observability practices (logging, metrics, tracing). Understanding of database partitioning and query optimization patterns . Reasons Why You Would Enjoy Working With Us We work in the latest technologies and with international clients, and our projects are polished from < to /> - learn about some of the projects we have completed. We organize TechTalks, meet-ups and create guilds where we exchange knowledge - you can learn a lot from your teammates. We have a close-knit team and we make sure to have regular integrations - we often go out to celebrate together. You can work remotely or choose to work from our offices in Wroclaw or Bielsko-Biala. However, we count on your openness to occasionally visit the office for team meetings or client visits, or possible occasional trips to the client's headquarters. You can adjust your working hours to suit your needs, starting your day between 7:00 and 10:00 am. You can work with great specialists in their fields who also have a sense of humor and other after-hours hobbies. It is the people who create the unique atmosphere and relaxed atmosphere at CSHARK. We have a flat structure - we are not a corporation and don't want to be one 🙃. We offer bonuses for employee referrals (from 3000 PLN to 7000 PLN). We organize remote English classes and provide access to the company library. You can also become an author/author of articles published on our technical blog - https://cshark.com/blog/ .

🏢 Summary: Frontend Team Lead role focused on leading the development of scalable, high-performance React applications in a hybrid work model. The position combines hands-on architecture and implementation with mentoring a frontend team and enforcing best practices in design patterns, testing, and CI/CD. The role requires strong expertise in modern React ecosystem and state management to drive frontend excellence. 🗂️ Requirements: 5+ years experience with JavaScript or TypeScript, 3+ years commercial experience with React.js, Strong knowledge of React Hooks and Context API, Strong experience with Redux and Redux Toolkit, Experience with frontend design patterns and clean code principles, Experience integrating REST or GraphQL APIs, Strong knowledge of HTML5 and CSS3 or SCSS, Experience with component libraries and design systems, Familiarity with Webpack or Vite build tools, Experience with unit and integration testing, Experience leading or mentoring frontend developers 📃 Skills: JavaScript, TypeScript, React, Hooks, ContextAPI, Redux, ReduxToolkit, HTML5, CSS3, SCSS, REST, GraphQL, Webpack, Vite, Jest, ReactTestingLibrary, Storybook, MaterialUI, Tailwind, Next.js, Lighthouse, ChromeDevTools, WCAG, CICD 🏢 Description: Frontend Team Lead (React) 📍 Warsaw Poland, Hybrid remote with 3 days from office 💼 Contract of Employment / Umowa o pracę 💰 Monthly compensation up to 8,000 USD About the Client Our Client is 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. Their integrated ecosystem includes PaaS - Platform as a Service, the Core Platform, an AI-native enterprise operations foundation built to optimize workflows, surface insights, and accelerate value creation across portfolios; SaaS - Software as a Service, a cloud platform delivering unmatched performance, intelligence, and execution at scale; and S&C - Solutions and Consulting Suite, modular technology playbooks designed to manage, grow, and optimize company performance. With over a decade of experience supporting high-growth companies and private equity-backed platforms, brings deep domain expertise and a proven ability to turn technology into a strategic advantage. The Role We are looking for an experienced and passionate React Team Lead to lead the development of modern, scalable web applications. You will guide a team of React developers, enforce best practices in frontend architecture and design patterns, and ensure delivery of high-performance user interfaces. The ideal candidate has strong expertise in React (including Hooks and Context API), Redux, and frontend design patterns, and thrives in a fast-paced, collaborative environment. Key Responsibilities Lead, mentor, and support a team of React developers through code reviews, 1:1s, and hands-on coaching. Collaborate with product managers, designers, and backend engineers to define and prioritize features. Own and manage sprint planning, task estimation, and delivery timelines for the frontend team. Architect and implement complex user interfaces using React, Hooks, and Context API. Maintain and evolve a scalable state management solution using Redux Toolkit. Enforce modern frontend design patterns (such as container/presenter, compound components, render props, and HOCs). Build reusable component libraries and maintain design system alignment. Optimize application performance, accessibility, and cross-browser compatibility. Drive best practices in code quality, testing, CI/CD, and documentation. Maintain high unit and integration test coverage (e.g., using Jest, React Testing Library). Contribute to frontend architecture decisions and evaluate new tools/libraries as needed. Requirements 5+ years of experience in JavaScript/TypeScript with 3+ years in React.js Strong expertise with React Hooks, Context API, and Redux (Redux Toolkit preferred) Proven experience with frontend design patterns and clean code principles Experience integrating with RESTful APIs or GraphQL Solid understanding of HTML5, CSS3/SCSS, and responsive UI design Experience with component libraries and design systems (e.g., Storybook, Material UI, Tailwind) Familiarity with build tools like Webpack, Vite, and bundler optimizations Experience leading or mentoring engineers in a team setting Nice to Have Familiarity with performance profiling tools (e.g., Lighthouse, Chrome DevTools) Experience with SSR/SSG frameworks like Next.js Knowledge of accessibility standards (WCAG) Contributions to open-source frontend libraries What’s Offered Monthly compensation up to 8,000 USD Opportunity to lead a specialized frontend team in a fast-growing tech company Real influence on frontend architecture and design patterns

🏢 Summary: Senior Frontend Developer role for a greenfield international project focused on enterprise-grade frontend applications using React and TypeScript. The position involves building advanced UI solutions, integrating APIs, and supporting explainable, auditable workflows in a hybrid B2B setup. Teams work cross-functionally following API-first and event-driven development principles. 🗂️ Requirements: Senior-level frontend development experience, Strong knowledge of React, Strong knowledge of TypeScript, Experience building complex enterprise-grade applications, Hands-on API integration experience, Familiarity with contract-first or API-first development, Experience creating reusable components, Experience working with design systems, Understanding of accessibility standards, Knowledge of responsive design, Knowledge of performance optimisation, Knowledge of usability principles, Experience with frontend testing, Ability to work in cross-functional teams, Strong quality and validation mindset, Fluent Polish, Fluent English 📃 Skills: React, TypeScript, API, HTML, CSS, JavaScript, Testing, Accessibility, Responsive, Performance, DesignSystems 🏢 Description: Cooperation Details Start date: As soon as possible, within 3–4 weeks Contract duration: 12 months initially, with possible extensions Contract type: B2B Working model: Hybrid, with 2 days per week from the Warsaw office and the remaining days remotely Equipment: Laptop provided by the client Travel: Up to one possible business trip per year to the Netherlands or France (paid by the Client) Languages: fluent Polish and English are a must We are looking for a Senior Frontend Developer to join a new initiative delivered for an international client operating in the information services sector. Both projects are greenfield initiatives developed from scratch. Each team will consist of approximately five people, including a Tech Lead, Backend Developer, Frontend Developer, and QA Engineer. Responsibilities - Developing frontend applications using React and TypeScript. - Building advanced enterprise-grade user interfaces, including dashboards, forms, filters, cards, and drill-down views. - Integrating frontend applications with APIs using a contract-first approach. - Designing and developing reusable components and solutions based on a design system. - Ensuring accessibility, responsiveness, performance, usability, and overall application quality. - Implementing explainability-focused UI patterns, including evidence, rationale, confidence levels, and source traceability. - Building human review workflows that support approval, rejection, and manual override of system recommendations. - Collaborating closely with the Tech Lead, Backend Developers, QA Engineers, and other team members. - Contributing to component, UI integration, and regression testing. - Working according to spec-driven development, API-first, and event-driven delivery principles. - Ensuring auditability, traceability, and explainability by design. - Supporting thin vertical slice and steel-thread delivery to validate end-to-end functionality early in the development process. Requirements - Senior-level experience in frontend software development. - Strong practical knowledge of React and TypeScript. - Experience in building complex enterprise-grade applications and user interfaces. - Hands-on experience with API integration. - Familiarity with contract-first or API-first development. - Experience in creating reusable components and working with design systems. - Good understanding of accessibility, responsive design, performance optimisation, and usability. - Experience with frontend components, integration, and regression testing. - Ability to work effectively in a cross-functional product team. - Strong quality and validation mindset from the beginning of the development lifecycle. - Fluency in Polish and English. - Experience in projects involving AI, agentic workflows, human-in-the-loop governance, explainability, or decision-support systems will be considered an advantage.

🏢 Summary: Hybrid React Team Lead role focused on leading the development of scalable web applications and managing a frontend team in a dynamic, product-oriented environment. The position combines hands-on React development with architectural decisions, state management design, and close collaboration with cross-functional teams. It requires strong expertise in modern frontend technologies, testing practices, and performance optimization. 🗂️ Requirements: 5+ years experience with JavaScript/TypeScript, 3+ years experience with React.js, Strong knowledge of React Hooks, Strong knowledge of Context API, Strong knowledge of Redux (Redux Toolkit preferred), Experience with frontend design patterns, Experience with clean code principles, Experience with RESTful APIs or GraphQL, Good knowledge of HTML5, Good knowledge of CSS3/SCSS, Experience with responsive design, Experience with component libraries and design systems, Familiarity with Webpack or Vite, Experience leading or mentoring developers 📃 Skills: JavaScript, TypeScript, React, Redux, ReduxToolkit, Hooks, ContextAPI, HTML5, CSS3, SCSS, REST, GraphQL, Webpack, Vite, Jest, ReactTestingLibrary, Storybook, MaterialUI, Tailwind, Next.js, Lighthouse, ChromeDevTools, WCAG 🏢 Description: Please note: This is a hybrid role – 3 days per week from the office in Warsaw. Overview We are a leader in AI-powered enterprise operations. We deliver digital solutions and consulting services that help companies grow and improve their performance. We use advanced technology to simplify processes, increase efficiency, and create new business opportunities, especially in private capital markets. Our ecosystem includes: PaaS (Platform as a Service) – an AI-based platform that improves workflows, provides useful insights, and supports value creation across portfolios. SaaS (Software as a Service) – a cloud platform that offers strong performance, smart tools, and scalable solutions. S&C (Solutions and Consulting Suite) – modular technology solutions that help manage, grow, and improve company performance. With more than 10 years of experience working with fast-growing companies and private equity-backed businesses, we combine strong industry knowledge with technology expertise to create real business value. The Opportunity We are looking for an experienced and motivated React Team Lead to lead the development of modern and scalable web applications. You will manage a team of React developers, support good frontend architecture practices, and make sure we deliver fast and high-quality user interfaces. The ideal candidate has strong experience with React (including Hooks and Context API), Redux, and frontend design patterns. You should feel comfortable working in a dynamic and team-oriented environment. Responsibilities Lead, mentor, and support a team of React developers through code reviews, 1:1 meetings, and practical guidance. Work closely with product managers, designers, and backend engineers to plan and prioritize features. Manage sprint planning, task estimation, and delivery timelines for the frontend team. Design and build complex user interfaces using React, Hooks, and Context API. Develop and maintain scalable state management solutions using Redux Toolkit. Apply modern frontend design patterns (such as container/presenter, compound components, render props, and HOCs). Build reusable component libraries and ensure alignment with the design system. Improve application performance, accessibility, and cross-browser compatibility. Promote best practices in code quality, testing, CI/CD, and documentation. Maintain strong unit and integration test coverage (e.g., with Jest and React Testing Library). Support frontend architecture decisions and evaluate new tools when needed. Requirements 5+ years of experience with JavaScript/TypeScript, including 3+ years with React.js Strong knowledge of React Hooks, Context API, and Redux (Redux Toolkit preferred) Experience with frontend design patterns and clean code principles Experience working with RESTful APIs or GraphQL Good knowledge of HTML5, CSS3/SCSS, and responsive design Experience with component libraries and design systems (e.g., Storybook, Material UI, Tailwind) Familiarity with build tools such as Webpack or Vite Experience leading or mentoring developers Nice to Have Experience with performance tools (e.g., Lighthouse, Chrome DevTools) Experience with SSR/SSG frameworks like Next.js Knowledge of accessibility standards (WCAG) Contributions to open-source frontend projects Why Join Us? We are looking for creative people who solve problems, learn quickly, and enjoy working in an open and diverse environment. We work hard, support each other, and also make time to enjoy what we do.

🏢 Summary: Lead a mobile engineering team to build and maintain scalable iOS and Android applications, owning the full mobile development lifecycle from development to operations. The role focuses on mobile architecture, engineering quality, API integration, and collaboration with cross-functional teams in a hybrid work environment. 🗂️ Requirements: Experience as a Tech Lead in Agile mobile teams, Strong hands-on experience with Swift and/or Kotlin, Knowledge of MVVM and Clean Architecture, Experience with CI/CD, testing, and monitoring, Understanding of API integration and backend basics, DevOps awareness, Strong problem-solving and decision-making skills, Fluent English, Availability to work from the Warsaw office 3 days per week 📃 Skills: Swift, Kotlin, MVVM, CI/CD, Testing, Monitoring, APIs, DevOps, Flutter, React, Java, Node.js, Android, iOS 🏢 Description: Your responsibilities: Lead, mentor, and grow a team of iOS and/or Android engineers, fostering a collaborative and high-performance culture Own the end-to-end mobile lifecycle (build, test, deploy, run – You build it, you run it) Develop scalable, high-quality mobile applications with a strong focus on performance and user experience Ensure code quality through pair programming, reviews, and defined engineering standards Align mobile solutions closely with backend systems, APIs, and enterprise architecture Drive the evolution of the mobile architecture, tooling, and overall application landscape Identify and reduce technical debt and operational risks Collaborate closely with Product, Design, SRE, and Security to deliver sustainable and reliable solutions Your Profile: Proven experience as a Tech Lead in Agile mobile teams Strong hands-on background in iOS (Swift) and/or Android (Kotlin) Solid understanding of modern architecture patterns (e.g. MVVM, Clean Architecture) Experience with CI/CD, testing, and monitoring in mobile environments Full-stack mindset (API integration, backend basics, DevOps awareness) Strong problem-solving skills, ownership, and decision-making capabilities Experience with or interest in cloud technologies Clear communication skills and strong self-initiative Fluent in English Nice to have -Experience with cross-platform frameworks (Flutter, React Native) -Backend knowledge (e.g. Java, Node.js) -Experience with cloud & DevOps You are comfortable coming to our Warsaw office 3 days a week. How about? Employment contract? Of course. With us you do not have to worry about stable employment. Benefits? We have them! Among other: corporate incentive program, sport card, private medical care. Lunch card? With the cooperation extended and permanent contract, you will receive additional funds to use for meal purchases. Working in a hybrid model? Of course! ! You work with us 2 days a week from home. Work wherever you want? In PAYBACK you have the opportunity. Working 100% remotely, also from European countries for 15 days a year. ‎Flexible working hours? Sounds great! We start working between 7 to 10. Trainings? Of course. We provide training to develop hard and soft skills. Convenient location? Sure! We invite you to our new office at Rondo Daszyńskiego, but we are currently also working remotely. Dress code? We definitely say no. There are no rigid dress code rules in our company, sneakers are more than welcome. Friendly atmosphere at work? Yes! In PAYBACK, people are the most important asset‎. Something is missing? Open communication is our priority, so dare to ask!‎

🏢 Summary: Technical leadership role for a Mobile Tech Lead responsible for building and scaling high-quality iOS and/or Android applications while owning the full mobile lifecycle. The position combines hands-on development with architectural ownership, mobile DevOps practices, and close backend integration. The role focuses on performance, scalability, and continuous improvement of mobile architecture and engineering standards. 🗂️ Requirements: Proven experience as Tech Lead in Agile mobile teams, Strong hands-on experience with iOS and/or Android development, Proficiency in Swift and/or Kotlin, Knowledge of MVVM and CleanArchitecture, Experience with CI/CD in mobile environments, Experience with mobile testing and monitoring, Experience with API integration and backend basics, Understanding of DevOps practices, Experience or interest in Cloud technologies, Fluent English 📃 Skills: iOS, Android, Swift, Kotlin, MVVM, CleanArchitecture, CICD, Testing, Monitoring, APIs, DevOps, Cloud, Flutter, ReactNative, Java, Node.js, Agile 🏢 Description: Your responsibilities: Lead, mentor, and grow a team of iOS and/or Android engineers, fostering a collaborative and high-performance culture Own the end-to-end mobile lifecycle (build, test, deploy, run – You build it, you run it) Develop scalable, high-quality mobile applications with a strong focus on performance and user experience Ensure code quality through pair programming, reviews, and defined engineering standards Align mobile solutions closely with backend systems, APIs, and enterprise architecture Drive the evolution of the mobile architecture, tooling, and overall application landscape Identify and reduce technical debt and operational risks Collaborate closely with Product, Design, SRE, and Security to deliver sustainable and reliable solutions Your Profile: Proven experience as a Tech Lead in Agile mobile teams Strong hands-on background in iOS (Swift) and/or Android (Kotlin) Solid understanding of modern architecture patterns (e.g. MVVM, Clean Architecture) Experience with CI/CD, testing, and monitoring in mobile environments Full-stack mindset (API integration, backend basics, DevOps awareness) Strong problem-solving skills, ownership, and decision-making capabilities Experience with or interest in cloud technologies Clear communication skills and strong self-initiative Fluent in English Nice to have -Experience with cross-platform frameworks (Flutter, React Native) -Backend knowledge (e.g. Java, Node.js) -Experience with cloud & DevOps You are comfortable coming to our Warsaw office 3 days a week. How about? Employment contract? Of course. With us you do not have to worry about stable employment. Benefits? We have them! Among other: corporate incentive program, sport card, private medical care. Lunch card? With the cooperation extended and permanent contract, you will receive additional funds to use for meal purchases. Working in a hybrid model? Of course! ! You work with us 2 days a week from home. Work wherever you want? In PAYBACK you have the opportunity. Working 100% remotely, also from European countries for 15 days a year. ‎Flexible working hours? Sounds great! We start working between 7 to 10. Trainings? Of course. We provide training to develop hard and soft skills. Convenient location? Sure! We invite you to our new office at Rondo Daszyńskiego, but we are currently also working remotely. Dress code? We definitely say no. There are no rigid dress code rules in our company, sneakers are more than welcome. Friendly atmosphere at work? Yes! In PAYBACK, people are the most important asset‎. Something is missing? Open communication is our priority, so dare to ask!‎

🏢 Summary: Tech Lead role focused on designing and delivering backend-centric, cloud-based solutions for a custom industrial application covering end-to-end logistics, production, and shipment processes. The position combines strong .NET backend expertise with Angular fullstack work, emphasizing Domain Driven Design, Clean Architecture, and microservices. The role requires technical ownership, architectural decision-making, and pragmatic delivery within a European team. 🗂️ Requirements: Minimum 7 years of commercial experience in .NET development, Experience in senior or Tech Lead role, Strong backend expertise, Hands-on Fullstack experience with Angular, Experience with cloud-native architectures, Knowledge of Domain Driven Design, Knowledge of Clean Architecture, Experience with microservices, Experience with API design, Practical use of AI tools in development, Fluent English, Residence in Poland 📃 Skills: .NET, Angular, C#, Cloud, Microservices, APIs, DDD, Architecture, AI, Git 🏢 Description: We are looking for an experienced Tech Lead to join a European team working on a custom-built solution for the industrial/manufacturing sector. The application supports an end-to-end process—from logistics, through production, to final shipment—ensuring full traceability and process control. This role is strongly backend- and cloud-focused and requires a pragmatic, delivery-oriented mindset. Your tasks Design, develop, and maintain backend-centric fullstack solutions using .NET and Angular Take ownership of technical decisions with a strong focus on backend architecture and cloud-based solutions Build and evolve systems based on Domain Driven Design and Clean Architecture Design, develop, and maintain microservices, APIs, and integration layers Ensure code quality through unit tests and architectural consistency Plan and realistically deliver roadmap items, focusing on feasibility, prioritization, and execution Requirements Minimum 7 years of commercial experience in .NET development, including senior or tech lead responsibilities Strong backend expertise combined with hands-on experience as a Fullstack Developer (Angular) Solid understanding of cloud-native architectures and modern backend systems Solid understanding of Domain Driven Design, Clean Architecture, microservices, and API design Practical experience using AI tools in daily development work (e.g., AI copilots, AI-assisted coding, AI-driven workflows) Pragmatic, realistic engineering mindset focused on delivery, planning, and rational decision-making Ability to take ownership of complex topics and drive them to completion Fluency in English Residing in Poland required

🏢 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: Senior Backend Developer role focused on Risks & Inspections and Safety Intelligence projects using .NET/C# and event-driven architecture. The position involves API and service development, domain modeling, integrations, and comprehensive testing in a hybrid work model based in Warsaw. Full-time B2B contract with potential long-term extension and occasional international travel. 🗂️ Requirements: Strong proficiency in .NET, Strong proficiency in C#, Experience in API development, Experience in service implementation, Familiarity with event-driven architecture, Expertise in domain modeling, Knowledge of tenant-aware data management, Experience with unit testing, Experience with integration testing, Experience with service testing, Experience with contract testing, English proficiency, Availability for hybrid work in Warsaw 📃 Skills: .NET, C#, API, React, MDM, workflow, audit, testing, integration, queues, idempotency 🏢 Description: Work model: hybrid - 2 days a week, Warsaw office. Project language: English. Start: ASAP or 30 days. Remuneration: B2B > up to 48 USD/hour. FTE: full-time (40 hours per week). Business Travel: may travel once a year to France or the Netherlands. Equipment: laptop provided by the client. Industry: Information Services. We are seeking a skilled Backend Developer to join our innovative team focusing on Risks & Inspections and Safety Intelligence projects. The ideal candidate will possess robust experience in .NET / C# development, API and service implementation, and event-driven design patterns. You will play a critical role in ensuring effective domain modeling, integration with various services, and thorough testing methodologies. Main Responsibilities: - Implementing strong .NET / C# development practices. - Executing API and service implementations. - Utilizing event-driven patterns such as events, queues, and idempotency. - Developing comprehensive domain models and state management. - Managing tenant-aware data access and conducting authorization checks. - Integrating with MDM, workflow, audit, and various data services. - Conducting unit, integration, service, and contract testing. - Collaborating on specifications from structured requirements. Key Requirements: - Strong proficiency in .NET / C#. - Experience in API and service development. - Familiarity with event-driven software architecture. - Expertise in domain modeling and traceability. - Knowledge of tenant-aware data management. - Experience in effective testing methodologies across multiple domains. Nice to Have: - Experience with React or similar frameworks. - Understanding of spec-driven development practices. - Capability to work in a contract-first delivery environment. - Experience with cross-capability collaboration. Other Details: - The role is designed for a new initiative with a senior-level requirement. - Two 5-person teams are being built with a target start date within 3-4 weeks. - The initial contract duration is 12 months, with potential extensions subject to a one-month notice period. - The work is primarily remote, requiring office attendance two days a week. - Candidates may need to travel to the Netherlands or France once during the year. - English language proficiency is necessary. - Equipment will be provided by the organization.