June 19, 2026
Frontend Engineer
Mid • Hybrid
12,000 - 17,500 PLN
Poznan, Poland
About company
Founded in 2011, Cleeng is the Subscriber Retention Management® Company. Cleeng unifies the entire subscriber experience across web and mobile apps from a single platform, empowering D2C companies to simplify subscription management and maximize customer lifetime value.
Our award-winning Subscriber Retention Management (SRM®) suite delivers comprehensive solutions through an integrated approach - from flexible web payments and in-app subscriptions to sophisticated recurring billing and AI-powered customer support.
Trusted by industry leaders, including the NHL, Big Ten Network, The Weather Channel, TOD/BeIN, and NHK, Cleeng's complete suite helps businesses reduce churn and drive sustainable revenue growth across every channel.
About the role
We are looking for a Front-end Engineer to join our Subscriber Experience Squad (SXP) - a high-impact, cross-functional team responsible for the full subscriber lifecycle, from checkout to account management.
In this role, you will focus on building high-quality user interfaces that directly impact conversion, retention, and overall user experience. You will work closely with product leaders and engineering teams to deliver reliable and scalable front-end solutions.
AI is our foundation.
We are an AI-first company. You’ll go beyond traditional coding by weaving AI into your daily workflow to handle repetitive tasks and speed up development. This role is for someone who uses AI tools to boost shipping velocity while maintaining high standards for code quality and system reliability.
Your mission
Build intuitive, responsive, high-performing user interfaces in an AI-first development culture that enhance subscriber experiences across key journeys.
Your Responsibilities
Master and evolve our AI-first development workflows
Build and maintain front-end applications using React and TypeScript
Implement user-facing features based on product and design requirements
Write clean, maintainable, and well-tested code
Contribute to component libraries and reusable UI patterns
Collaborate closely with designers, product managers, and engineers
Ensure high quality through automated testing (unit and integration)
Debug and fix issues across different browsers and devices
Continuously look for ways to improve user experience and development practices
The ideal candidate will have the following Competencies
Practical use of AI tools in day-to-day development
2-4 years of experience building front-end applications with React
Solid knowledge of TypeScript and JavaScript fundamentals
Good understanding of HTML, CSS, and browser behavior
Experience writing automated tests (unit, integration) and testing frameworks (e.g. Playwright)
Experience building responsive, user-friendly interfaces
Understanding of backend concepts (APIs, server-side logic)
Practical experience using AI tools in day-to-day development
Strong attention to detail and code quality
Good communication skills in English (B2+ minimum)
Proactive attitude and willingness to learn
Nice to have
Experience with Next.js and server-side development
Familiarity with AWS or other cloud environments
We offer:
Flexible working hours and form of employment;
100 % paid sick leave within the agreed limits;
Events, celebrations
Work with an international team of well - rounded experts in Amsterdam (HQ), Poznan, Manila, NYC. 16 nationalities and counting!
Work on unique, market-leading, SaaS products, with clients all over the world, from New Zealand, Japan, Europe, US, and Latam;
Work closely with people who value diversity, hard work, friendly relationships and love their jobs, and get all together to the next level!
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Krakow, Poland
3,600 - 7,410 USD
🏢 Summary: The role is for a Middle/Senior Full Stack Engineer to build and scale a SaaS platform using Java and React, contributing to architecture, secure cloud-based integrations, and CI/CD processes. The position involves end-to-end development, code reviews, and collaboration with cross-functional teams in a product built from the ground up. It offers significant ownership and impact within a high-scale environment. 🗂️ Requirements: 4+ years of SaaS development experience, Proficiency in Java, Proficiency in React, Strong knowledge of SQL, Experience with microservices architecture, Experience with JavaScript and TypeScript, Understanding of CI/CD practices, Understanding of observability concepts, Ability to work with EST time zone overlap, Upper-intermediate English proficiency 📃 Skills: Java, React, SQL, JavaScript, TypeScript, ReactJS, Microservices, CI/CD, Redis, Elasticsearch, AWS 🏢 Description: ID67841 AgileEngine is an Inc. 5000 company that creates award-winning software for Fortune 500 brands and trailblazing startups across 17+ industries. We rank among the leaders in areas like application development and AI/ML, and our people-first culture has earned us multiple Best Place to Work awards. Why join us If you're looking for a place to grow, make an impact, and work with people who care, we'd love to meet you! :) About the role We are looking for a Middle/Senior Full Stack Engineer to build robust server-side solutions for a SaaS platform operating at scale, working across Java, React, SQL, Redis, and Elasticsearch. You will contribute to architecture decisions, design reusable client integration systems following secure cloud best practices, and participate in code reviews and CI/CD processes as a trusted technical resource for the team. The role offers significant ownership from day one in a product built from the ground up. What you will do Build a cleanly designed, reusable client integration system adhering to secure cloud software best practices from start to finish; Collaborate with design and product teams to understand requirements, create estimates, plan sprints, and meet delivery timelines; Plan and accurately estimate construction and delivery timelines; Contribute to technical documentation and automated build and deployment processes designed to increase engineer efficiency; Review code submitted by other software engineers and submit your own code for review as part of the pull-request deployment process. Must haves 4+ years’ experience of SaaS experience; High level of proficiency in Java , React , and SQL ; Knowledge of or prior experience with microservices architecture ; Front end experience with JavaScript , Typescript , and ReactJS ; DevOps mindset of automation and continuous improvement; Good understanding of observability and familiarity with strong CI/CD practices; A proven ability to meet deadlines, motivate others, and consistently produce high quality, impactful results; Ability to maintain at least 6 hours of overlap with EST working hours ; Upper-intermediate and higher English proficiency. Nice to haves Experience building software in the cloud with AWS preferred. The benefits of joining us Professional growth Accelerate your professional journey with mentorship, TechTalks, and personalized growth roadmaps Competitive compensation We match your ever-growing skills, talent, and contributions with competitive USD-based compensation and budgets for education, fitness, and team activities A selection of exciting projects Join projects with modern solutions development and top-tier clients that include Fortune 500 enterprises and leading product brands Flextime Tailor your schedule for an optimal work-life balance, by having the options of working from home and going to the office – whatever makes you the happiest and most productive. Meet Our Recruitment Process Asynchronous stage – An automated, self-paced track that helps us move faster and give you quicker feedback: Short online form to confirm basic requirements 30–60 minute skills assessment via Codility – a platform founded in Poland that helps us provide quicker feedback and streamline this stage of the process. 5-minute introduction video Synchronous stage – Live interviews Technical interview with our engineering team (scheduled at your convenience) Final interview with your future teammates If it’s a match — you’ll get an offer!
Technology
ExpoPlatform
Staff Front-End Engineer
Senior
Remote
23,000 - 26,000 PLN
🏢 Summary: Senior individual contributor role focused on leading frontend architecture transformation to a scalable React/Next.js ecosystem, driving technical standards, performance, and cross-team engineering excellence. Responsible for defining architecture, leading complex migrations from legacy systems, and ensuring high-performance, real-time capabilities across the platform. The role emphasizes architectural leadership, modern tooling, and AI-first development practices in a high-traffic environment. 🗂️ Requirements: 10+ years commercial software engineering experience, 5+ years experience with React and TypeScript, Strong expertise in Next.js including SSR and SSG, Experience leading frontend architectural decisions across teams, Proficiency with modern frontend build tools, Strong knowledge of OOP and design patterns, Experience with WebSockets and real-time applications, Hands-on experience with unit and end-to-end testing, Experience with CI/CD pipelines and automated releases, Ability to design and document system architecture (C4 diagrams), Experience optimizing performance for high-traffic applications, Practical experience using AI development tools 📃 Skills: React, Next.js, TypeScript, JavaScript, Vite, Rollup, Webpack, MaterialUI, CSS, HTML, WebSockets, Canvas, Three.js, Cypress, Playwright, CI/CD, Bitbucket, GitHubActions, OOP, SSR, SSG, AI, Copilot, Cursor 🏢 Description: Staff Front-End Engineer (React/Next.js) Full-time | Remote About Us ExpoPlatform is a UK-based tech company founded in 2013, delivering cutting-edge solutions for online, hybrid, and in-person events in over 30 countries. Our platform powers registration, attendee engagement, event websites, networking tools, and more, offering a complete digital infrastructure for exhibitions and conferences. We’re currently modernising our frontend platform, moving from legacy architecture to a scalable React/Next.js ecosystem — and this role sits at the heart of that evolution. Your Role We’re looking for a Staff Front-End Engineer to drive technical excellence across our frontend discipline. This is a senior individual contributor role, not a people manager — your impact comes through architecture, engineering standards, mentorship, and cross-team technical leadership. You’ll define how we build, review how we ship, and raise the bar for every engineer around you. This role spans multiple product teams, requiring strong collaboration, the ability to influence without authority, and a passion for building scalable, maintainable, high-performing frontend systems. Key Responsibilities: Define and evolve frontend architecture standards, ensuring long-term scalability and maintainability Lead technical design and reviews for high-impact initiatives: SSR/SSG, state management, component architecture Facilitate architecture discussions with up-to-date diagrams (C4, sequence) before major decisions; maintain documentation in Confluence Lead migration from legacy jQuery to React/Next.js, driving quality and consistency across teams Define and maintain coding, design, and testing standards; improve CI/CD pipelines, quality gates, and observability practices Reduce technical debt through systemic refactors and best practice adoption Ensure UI performance under high concurrency (5,000+ simultaneous users); implement real-time functionality via WebSockets and Canvas/Three.js Improve local dev environments and tooling to support delivery speed; guide test architecture in collaboration with QA and DevOps Mentor engineers on architectural thinking, share knowledge through design sessions, documentation, and pairing Partner with Product, Design, QA, and Staff Engineers to deliver reliable, scalable frontend solutions. Champion AI-first development practices — leverage AI tooling to accelerate delivery, improve code quality, and embed intelligent capabilities across the frontend platform. Requirements: 10+ years of commercial software engineering experience, with significant depth in frontend 5+ years focused on React/TypeScript, with strong Next.js expertise including SSR/SSG and complex migrations Proven ability to lead architectural decision-making across teams and drive platform-wide technical standards Proficiency with modern frontend tooling: Vite, Rollup, Webpack, Material UI, CSS/HTML Solid understanding of OOP, design patterns, and frontend software architecture Experience with WebSockets and interactive frontend visualisations (Canvas/Three.js a plus) Hands-on experience with Unit Testing, Cypress and Playwright, and maintaining testable frontend codebases Familiarity with CI/CD pipelines, Bitbucket, GitHub Actions, and automated release processes Able to model and explain system architecture (e.g. C4 diagrams) Experience mentoring senior engineers and influencing engineering culture Advanced or native-level English, with the ability to clearly communicate technical concepts to both technical and non-technical stakeholders, including external partners and clients Problem-solving mindset with demonstrated experience in performance optimisation for high-traffic applications AI-first mindset — practical experience using AI tools (e.g. Copilot, Cursor, or similar) in day-to-day engineering, and ability to evaluate and adopt AI capabilities in product features. What We Offer A chance to shape the entire frontend discipline of a globally used event-tech platform Freedom to propose architectural improvements and drive meaningful technical change A collaborative, international team built on trust, transparency, and shared ownership Culture that values curiosity, innovation, and continuous improvement Competitive salary & financial stability Flexible work hours and a fully remote setup.
Technology
AgileEngine
Full Stack Engineer
Senior
Remote
Krakow, Poland
5,600 - 7,400 USD
🏢 Summary: Senior Full Stack Engineer role focused on building and modernizing a large-scale healthcare platform supporting primary care programs. The position involves developing scalable backend APIs in C#/.NET and frontend applications in React and TypeScript, along with healthcare integrations such as EMR systems and HL7/FHIR. You will collaborate cross-functionally to deliver high-quality, performant, and maintainable solutions. 🗂️ Requirements: 6+ years of software development experience, Experience with C# and .NET Framework/.NET Core/.NET 6+, Experience with React and/or Angular, Experience with TypeScript, Experience with SQL Server and/or PostgreSQL, Experience with NoSQL databases, Experience with Telerik/Kendo UI, Experience with API design and development, Experience with distributed systems, Upper-intermediate English level 📃 Skills: C#, .NET, .NETCore, .NET6, React, Angular, TypeScript, SQLServer, PostgreSQL, NoSQL, Telerik, Kendo, APIs, DistributedSystems, Azure, HL7, FHIR, EMR, EHR 🏢 Description: ID69153 AgileEngine is an Inc. 5000 company that creates award-winning software for Fortune 500 brands and trailblazing startups across 17+ industries. We rank among the leaders in areas like application development and AI/ML, and our people-first culture has earned us multiple Best Place to Work awards. Why join us If you're looking for a place to grow, make an impact, and work with people who care, we'd love to meet you! :) About the role We are looking for a Senior Full Stack Engineer to develop and maintain backend and frontend components of a large-scale healthcare platform supporting primary care programs. You will build scalable APIs and business workflows using C# and .NET Core, implement React and TypeScript frontend experiences, and contribute to healthcare integrations including EMR systems and HL7/FHIR standards. The role spans modernization initiatives and cross-functional collaboration with product, data, DevOps, and clinical teams. What you will do Develop and maintain backend and frontend platform components; Participate in architecture and technical design discussions; Implement scalable APIs and business workflows; Build healthcare workflows and integrations; Support modernization and refactoring initiatives; Collaborate with product, data, DevOps, and clinical teams; Improve performance, maintainability, and code quality; Contribute to code reviews and technical decision-making. Must haves 6+ years software development experience ; Experience with C# / .NET Framework, .NET Core / .NET 6+ ; Experience with React and/or Angular ; Experience with TypeScript ; Experience with SQL Server and/or PostgreSQL ; Experience with No-SQL Databases ; Experience with Telerik/Kendo UI ; Experience with API design and development ; Experience with distributed systems; Upper-intermediate English level. Nice to haves Experience with healthcare software; Experience with EMR / EHR systems; Experience building offline-first applications; Experience with Azure; Familiarity with HL7/FHIR familiarity. The benefits of joining us Professional growth Accelerate your professional journey with mentorship, TechTalks, and personalized growth roadmaps Competitive compensation We match your ever-growing skills, talent, and contributions with competitive USD-based compensation and budgets for education, fitness, and team activities A selection of exciting projects Join projects with modern solutions development and top-tier clients that include Fortune 500 enterprises and leading product brands Flextime Tailor your schedule for an optimal work-life balance, by having the options of working from home and going to the office – whatever makes you the happiest and most productive. Meet Our Recruitment Process Asynchronous stage – An automated, self-paced track that helps us move faster and give you quicker feedback: Short online form to confirm basic requirements 30–60 minute skills assessment via Codility – a platform founded in Poland that helps us provide quicker feedback and streamline this stage of the process. 5-minute introduction video Synchronous stage – Live interviews Technical interview with our engineering team (scheduled at your convenience) Final interview with your future teammates If it’s a match — you’ll get an offer!
Technology
AgileEngine
Frontend Engineer ID55143
Senior
Remote
Krakow, Poland
4,200 - 7,700 USD
🏢 Summary: Senior/Lead Frontend Engineer role focused on building and leading the development of modern, high-performance React web applications. The position involves architecting scalable frontend solutions, creating reusable UI components, and driving best practices in code quality, accessibility, and performance. You will influence technical decisions, mentor developers, and contribute to product experience and frontend architecture. 🗂️ Requirements: University degree in Information Technology or related field or equivalent experience, 7+ years of software development experience focused on modern frontend technologies, Strong experience with React.js and component-based development, Experience building dynamic and customizable layouts, Experience with design systems and reusable UI component libraries, Knowledge of clean code principles and design patterns, Experience with scalable frontend architecture, Experience integrating REST or GraphQL APIs, Experience with state management tools, Experience with modern frontend build tools, Experience with modern styling systems, Professional English communication skills 📃 Skills: React, JavaScript, TypeScript, Redux, Zustand, REST, GraphQL, Vite, Webpack, ESBuild, CSS, Tailwind, styled-components, CSS-in-JS 🏢 Description: AgileEngine is an Inc. 5000 company that creates award-winning software for Fortune 500 brands and trailblazing startups across 17+ industries. We rank among the leaders in areas like application development and AI/ML, and our people-first culture has earned us multiple Best Place to Work awards. Why join us If you're looking for a place to grow, make an impact, and work with people who care, we'd love to meet you! :) About the role As a Senior/Lead Frontend Engineer , you will lead the development of modern web applications, crafting high-performance, scalable, and reusable UI components that bring complex data to life. Working with React and modern frontend architectures, you’ll drive technical decisions, mentor developers, and shape best practices in code quality, accessibility, and performance. This role offers strong influence on product experience and architecture while contributing to a collaborative, innovation-driven environment. What you will do Contribute to the frontend development of new web applications; Design and implement high-performance, maintainable, and reusable UI components; Drive the migration to modern tech stacks and architect scalable features for React applications; Visualize complex data sets using advanced frontend techniques; Ensure best practices in front-end architecture, code quality, accessibility, and testing; Participate in code reviews, technical discussions, and mentorship of developers; Continuously research and advocate for improvements in performance, scalability, and developer experience. Must haves University or college degree in Information Technology or a related field, or relevant work experience; 7+ years of software development experience with a strong focus on modern web frontend technologies; Solid experience with React.js and component-based development; Strong understanding of building dynamic and customizable layouts; Experience building or consuming design systems and reusable UI component libraries; Knowledge of clean code principles, design patterns, and scalable frontend architecture; Experience integrating REST or GraphQL APIs into web applications; Experience with state management tools such as Redux or Zustand ; Experience with build tools such as Vite , Webpack , or ESBuild ; Experience with styling systems such as CSS Modules, Tailwind , styled-components, or CSS-in-JS; Structured and analytical working style with strong team collaboration skills; Excellent English communication skills. Nice to haves German language proficiency. The benefits of joining us Professional growth Accelerate your professional journey with mentorship, TechTalks, and personalized growth roadmaps Competitive compensation We match your ever-growing skills, talent, and contributions with competitive USD-based compensation and budgets for education, fitness, and team activities A selection of exciting projects Join projects with modern solutions development and top-tier clients that include Fortune 500 enterprises and leading product brands Flextime Tailor your schedule for an optimal work-life balance, by having the options of working from home and going to the office – whatever makes you the happiest and most productive. Meet Our Recruitment Process Asynchronous stage – An automated, self-paced track that helps us move faster and give you quicker feedback: Short online form to confirm basic requirements 30–60 minute skills assessment via Codility – a platform founded in Poland that helps us provide quicker feedback and streamline this stage of the process. 5-minute introduction video Synchronous stage – Live interviews Technical interview with our engineering team (scheduled at your convenience) Final interview with your future teammates If it’s a match — you’ll get an offer!