Senior Frontend Engineer (Remote) Location: Remote or Berlin, hybrid | Team: Core | Level: Senior Join Winna.com – Help Build the Future of Crypto Gaming At Winna.com, we’re redefining what’s possible in crypto gaming. Our mission is simple: deliver a lightning-fast, seamless, and visually stunning gaming experience powered by cutting-edge blockchain technologies. We're building the most advanced crypto casino platform in the world—and we’re just getting started. We’re looking for a Senior Frontend Engineer who excels at building high-performance, interactive web applications. You’ll own the front-end architecture for our gaming experiences, optimize complex rendering pipelines, craft rich real-time interfaces, and push the limits of what’s possible in browser-based gaming. This is a fully remote or Hybrid role. We value autonomy, trust, and flexibility—and expect you to bring energy, ownership, and leadership wherever you work. What You’ll Be Doing - Own the design and implementation of our frontend architecture, ensuring fast, fluid, and responsive user experiences across devices. - Build and optimize interactive, real-time gaming interfaces using React, TypeScript, and PixiJS. - Work closely with product and design to translate game mechanics, animations, and interactions into high-quality frontend implementations. - Integrate with backend APIs and real-time systems (WebSockets, Pub/Sub) to deliver smooth multiplayer and live gaming features. - Develop reusable UI components, internal tooling, and performance-focused rendering systems. - Ensure front-end performance, accessibility, reliability, and security. - Collaborate cross-functionally with backend engineers, designers, and DevOps on end-to-end implementation of new gaming features. - Implement high-quality testing, monitoring, and observability for frontend systems. - Drive best practices across code quality, architecture, CI/CD, and frontend development workflows. - Mentor engineers and contribute to a culture of technical excellence. Technologies You’ll Work With Core Frontend: - React - TypeScript - PixiJS - HTML5 canvas & WebGL - WebSockets / real-time systems Supporting Tech: - Node.js (for integration and understanding API design) - PostgreSQL - Redis - RabbitMQ Bonus Skills (Nice to Have Experience With) - Datadog or other front-end observability tools - AWS or similar cloud environments - CI/CD pipelines for frontend builds - Animation systems, physics engines, or game-loop logic - Experience in gaming, iGaming, or crypto products What We’re Looking For Must-Haves - 5+ years of professional software engineering experience with a strong focus on frontend development. - Deep expertise in React and TypeScript, including performance optimization and complex state management. - Experience building high-performance, graphics-heavy, or real-time applications (e.g., WebGL, Canvas, animations, games). - Strong understanding of client-side performance, rendering pipelines, and modern browser capabilities. - Experience integrating with real-time APIs (WebSockets, event streams). - Familiarity with modern CI/CD workflows for frontend apps. Nice-to-Have - Background in crypto, gaming, or iGaming. - Experience with multiplayer systems, client-server sync, or animation frameworks. - Comfort working with Node.js for API integration or build tooling. - Experience leading initiatives or mentoring engineers. - Knowledge of cloud deployment environments (AWS) and containerization. Why Join Winna.com? - Be part of a fast-growing and well-funded start-ups at the intersection of gaming and blockchain. - Work with a world-class engineering team—collaborative, autonomous, and impact-driven. - Own critical parts of the front-end architecture powering next-generation gaming experiences. - Remote-first culture with flexible hours, asynchronous communication, and no micromanagement. - Build products you’ll be genuinely excited about. What You’ll Get - Competitive Salary – We pay top-of-market for top-tier talent - Private Health Insurance – Comprehensive coverage - Remote-First Work Environment – Work from anywhere - Generous Holiday Allowance - Flexible Time Off & Hours – We focus on output - Performance-Related Bonus – We reward meaningful impact Ready to Build with Us? We’re creating something bold and different—and we want the best minds to help us do it. If you're passionate about infrastructure, performance, and pushing tech boundaries, apply now and let’s build the future of crypto gaming together.

Our company Surfer is an AI Visibility Platform that helps marketing teams become the definitive answer wherever their buyers search — across Google and AI search. The platform combines data, research-backed optimization, and a user-friendly workflow to grow brand visibility through content where buying decisions start to form. Surfer is used by content marketers, SEO specialists, agencies, and in-house marketing teams around the world to track, plan, write, and optimize content that gets ranked and cited by both search engines and LLMs. Surfer is part of Positive Group - a fast-growing tech group specializing in B2B SaaS products that help marketing teams grow smarter. The group brings together several brands around a common ambition: to become the European benchmark in MarTech. With around 400 employees based in France, Germany, Italy, and Poland, Positive supports customers in 80+ countries. We’re a remote-first company, but if you ever crave some in-person energy, we’ve got a cozy office in Wrocław , Poland where the magic happens (and coffee never runs out ☕). Job Description Join the AI Tracker team – building Surfer’s AI-driven search visibility product. SEO is evolving. It’s no longer just about Google rankings — it’s about how brands appear inside LLM-generated answers. AI Tracker is our response to that shift. We build a product that monitors how LLMs talk about brands, analyzes AI visibility across queries, and turns raw AI data into actionable recommendations. This isn’t a pixel-perfect feature factory with a fixed roadmap. This is a product operating at the intersection of SEO, AI, LLMs and experimentation — where direction evolves as the market evolves. You Will Be Responsible For - Building and maintaining frontend features for AI Tracker in a rapidly evolving environment. - Designing AI-driven functionalities. - Ensuring code quality and flexibility as the product and backend evolve. - Collaborating closely with backend engineers and designers in a fast-iteration environment. - Contributing to LLM research and helping shape product direction. - Taking ownership from exploration to delivery. - Using AI coding tools effectively to speed up development. This role is not about polishing pixels for weeks. It’s about shipping, iterating, learning — and sometimes pivoting. You may be a good fit for this role if you - Have at least 7 years of experience in frontend engineering. - Have worked in dynamic, innovative product companies where there is no trade-off between speed and quality. - Have strong expertise in React, TypeScript, Apollo, and GraphQL. - Are comfortable working with evolving or partially defined backend APIs. - Can prototype quickly, even without finalized designs. - Thrive in dynamic environments without rigid roadmaps. - Are self-driven, proactive, and naturally take ownership. - Understand business context — not just technical implementation. - Have experience building AI-powered, user-facing products. - Communicate openly, challenge ideas constructively, and value collaboration. - Stay up to date with AI and LLM developments. - Use AI coding tools effectively and critically to improve productivity. Nice to Have - Experience with Node.js and Fastify. - Understanding of SEO or AI-driven search concepts. - Interest in automation and experimenting with AI agents in engineering workflows. What we offer: - Monthly Salary: 23 000 - 27 000 PLN + VAT on B2B contract - 27 days PTO per year. - Paid sick leave - your health comes first. - Medical insurance via SafetyWing. - Multisport card (50% covered). - Development budget: $1,000 annually for your growth and learning adventures. Location and Remote Work We’re a remote-first company, but if you ever crave some in-person energy, we’ve got a cozy office in Wrocław, Poland.

• Develop and maintain user interfaces using React and Next.js. • Work with our design system, theming, and localization to create consistent and responsive interfaces. • Build reusable UI components and contribute to the shared component library. • Integrate with REST and GraphQL APIs using generated typings. • Optimize rendering performance and bundle size for improved user experience. • Write and maintain unit and integration tests to ensure product reliability. • Participate in code reviews and contribute to evolving frontend best practices. • Work with error monitoring, logging, and analytics tools to ensure system health. • Collaborate closely with designers and backend engineers to deliver seamless user experiences. • Participate in architectural discussions and contribute to technical solution design.

Role Description We’re looking for a UX-minded Front-End Engineer to join our team and lead the development of cross-platform user experiences across web and mobile. You’ll work primarily in React Native to build high-quality, performant applications that run seamlessly on iOS, Android, and the web. You should be as comfortable pushing a new build to the App Store as you are shipping a new feature behind a feature flag on the web. You’ve built and scaled front-end applications that serve millions of users, and you know how to design for performance, reliability, and user experience at scale. You thrive in cross-functional environments and bring a deep appreciation for design, quality, and usability. We are looking to hire mid and senior level front end engineers! You have drive, hunger, intellectual rigor. You are an owner. This is a remote position. We are primarily looking for candidates based on the East Coast of the US or within Central European Time (CET ±2 hours) to ensure team overlap. You will: - Build and maintain cross-platform apps using React Native and related web technologies (e.g. React, Next.js) - Own feature development from design to deployment across iOS, Android, and web platforms - Leverage native iOS (Swift) code where necessary for performance or system integration - Collaborate with design, product, and backend engineering to bring features to life - Optimize performance, responsiveness, and accessibility across platforms - Help define and enforce front-end architecture, tooling, and code standards - Contribute to app store deployments and release management Qualifications - 5+ years of experience in front-end development, with significant time spent in React and React Native - A proven track record of building and maintaining front-end applications used by millions of users - Experience shipping production-quality mobile apps (iOS and/or Android) - Comfort working with native iOS (Swift or Objective-C) and integrating with React Native bridges - Strong understanding of front-end principles: component design, state management, mobile performance, etc. - Familiarity with app store processes (TestFlight, Apple App Store, Google Play) - A strong product sense and appreciation for good design and user experience - Excellent communication and collaboration skills Benefits - Medical, Dental, Vision - We're excited to offer comprehensive and competitive benefits including Medical, Dental, Vision - 401k: We offer a 401(k) with several investment options for pre-tax retirement savings.