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Senior Front-End Engineer

Development Team

On behalf of our Client from the  USA, Mobilunity is looking for a Senior Front-End Engineer.

This company specializes in developing innovative digital solutions for businesses, focusing on modular e-commerce, web performance optimization, and AI-driven retail technologies. They create flexible, API-first architectures that enhance scalability and user experience. Their expertise includes AI-powered recommendations, conversational commerce, and tailored digital experiences across various industries. With a customer-centric approach, they integrate artificial intelligence to drive efficiency and growth.

Responsibilities:

  • Collaborate with cross-functional teams (including U.S.-based PMs/sales) to align technical work with client expectations.
  • Lead end-to-end development of large-scale projects, including full-site rebuilds and feature enhancements.
  • Collaborate with product managers and architects to design and implement scalable front-end solutions aligned with business goals.
  • Write clean, reusable code with a focus on performance, testing, and maintainability.
  • Optimize applications for speed, scalability, and Core Web Vitals (e.g., LCP, FID, CLS).
  • Mentor junior engineers and contribute to architectural discussions around state management, caching, and deployment.
  • Troubleshoot and resolve complex technical issues in collaboration with support teams.
  • Maintain project documentation and track progress using Jira/Confluence.

Requirements:

  • Ability to collaborate effectively with global teams, explain technical concepts to non-technical stakeholders, and participate in client-facing discussions.
  • 5+ years of front-end development experience, including 2+ years in a senior role.
  • Expertise in React 17+, Next.js, and modern JavaScript/TypeScript.
  • Proficiency in REST API integration and performance optimization (CDNs, caching, code splitting).
  • Strong knowledge of CSS preprocessors (SASS, LESS) and responsive/mobile-first design.
  • Experience with server-side rendering, static site generation, and build tooling (Webpack, Babel).
  • Familiarity with CI/CD pipelines, cloud platforms (AWS, Vercel), and testing frameworks.
  • Solid understanding of e-commerce concepts and analytics tools (Google Analytics, GTM).
  • Level of English – Upper-Intermediate and higher.

Nice to have:

  • Experience with Shopify (custom apps, Hydrogen framework, OAuth flows) or other e-commerce platforms (SFCC, BigCommerce).
  • Knowledge of utility-first CSS (Tailwind) and modern state management (Redux, Zustand).
  • Exposure to headless CMS, composable commerce, or authentication solutions (NextAuth.js).
  • Familiarity with Next.js App Router, React Server Components, or edge computing.

In return we offer:

  • The friendliest community of like-minded IT-people
  • Open knowledge-sharing environment – exclusive access to a rich pool of colleagues willing to share their endless insights into the broadest variety of modern technologies
  • Paid sick leaves, including 5 paid days per year that don’t require a sick note
  • English classes in 1-to-1 & group modes with elements of gamification
  • Neverending fun: sports events, tournaments, music band, multiple affinity groups

Come on board, and let’s grow together!

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