Senior Front-End Engineer; React + Webflow | Remote | Eastern Europe
Position: Senior Front-End Engineer (React + Webflow) | Remote | Eastern Europe Get AI-powered advice on this job and more exclusive features. Upstack Data Full-Time Remote Eastern Europe $5,000 - $6,500 USD monthly salary Role hours require working US Eastern Timezone About Upstack Data We're a customer identity resolution platform helping marketing teams connect ad spend to actual customer behavior. We're a small but fast-growing bootstrapped SaaS company based in the USA with a fully remote team. About The Role We are seeking a talented and product-minded Senior Frontend Engineer to join Upstack Data, a customer identity resolution platform helping marketing teams connect ad spend to actual customer behavior. In this role, you will own our frontend applications—both our React-based B2B SaaS product and our Webflow marketing website—ensuring they are performant, scalable, and user-friendly. You will work directly with our CEO to translate business requirements into high-quality code, making independent UI/UX decisions throughout the product development lifecycle from initial concept to deployment and optimization. A distinguishing aspect of this role is your ability to design clean, modern interfaces without relying on dedicated designers. You will influence product and technology decisions, establish our component library and design system, and build interfaces for complex features including dashboards, analytics views, data tables, integration settings, and billing flows. This is an excellent opportunity for someone passionate about creating impactful B2B SaaS products, with strong product sense and an understanding of what makes tools like Stripe, Linear, and Vercel feel intuitive and polished.
Qualifications
- 6+ years of hands-on experience developing production React applications with Type Script
- Strong experience with types and backend API calls
- Expert proficiency in modern React patterns including hooks, context API, composition, and performance optimization
- Strong experience with shadcn
/ui, Radix UI, or similar headless component libraries
- Preferred Webflow proficiency for building and maintaining marketing pages and content management
- Solid understanding of Tailwind CSS and modern CSS practices (flexbox, grid, responsive design)
- Strong UI judgment and ability to design intuitive interfaces independently without designer mockups
- Experience building B2B SaaS applications with understanding of common UI patterns (data tables, filters, dashboards, forms, settings)
- Familiarity with RESTful APIs and integration with backend services and third-party platforms (Stripe, analytics, marketing tools)
- Experience with Git workflows and modern deployment practices
- Knowledge of frontend testing frameworks and best practices for code quality
- Excellent communication skills and autonomous problem-solving abilities
- Available for 4-5 hours overlap with US Eastern timezone (typically 2pm-10pm Eastern European time)
Responsibilities
- Design, develop, and maintain high-quality React components and features for our SaaS application using Type Script and shadcn/ui
- Make independent UI/UX decisions on layouts, user flows, information hierarchy, and interaction patterns that create intuitive user experiences
- Build and maintain our Webflow marketing website, landing pages, and implement conversion-focused optimizations
- Collaborate with the CEO on product requirements, providing technical perspective on feasibility and proposing alternative approaches that balance user value with engineering effort
- Establish and maintain our component library and design system to ensure consistency and reusability across the application
- Participate in code reviews and contribute to establishing frontend engineering standards and best practices
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