Alin Cristea

Full Stack Developer

Profile photo

Alin Cristea

Full Stack Developer

Spain

About

Experienced Full Stack Developer with expertise in React, Next.js, and Node.js. Passionate about creating efficient, user-friendly web applications with clean code and modern technologies.

Skilled in both frontend and backend development with a focus on delivering high-quality solutions.

Current:Senior Frontend @ Service Club
Focus:Next.js • Performance • Design Systems
Location:Spain

Work Experience

Companies I've worked with

Service Club logo

Service Club

Current

Senior Frontend Developer

Website
Barcelona, Catalonia, Spain · RemoteMay 2025 - Present
  • Contributed to the design and implementation of ServiceClub's Marketplace Frontend, a large-scale, modular monorepo built with modern web technologies.
  • Developed and maintained multiple Next.js 15 applications (Marketplace, Academy, Storybook) within a Turborepo architecture.
  • Implemented a shared UI library and design system using Radix UI, Tailwind CSS, and CVA, following Atomic Design principles.
  • Built reusable TypeScript packages for state management (Redux Toolkit), API queries (React Query), and form validation (React Hook Form + Zod).
  • Set up Vitest testing environment, ESLint/Prettier configs, and type-safe tooling across all apps.
  • Integrated Keycloak authentication and environment management for multi-app setup.
  • Designed a Docker + Nginx local infrastructure replicating production environments.
  • Improved developer experience with Turborepo caching, Changesets versioning, and Husky + Commitlint CI hooks.
ReactNext.jsTypeScriptTurborepoTailwind CSSRadix UI+9
Dooyu logo

Dooyu

Senior Frontend Developer

Website
April 2024 - April 2025
  • Worked on an innovative platform that helps creators monetize their knowledge.
  • Developed responsive and interactive features for content creator platform.
  • Implemented real-time communication capabilities using Socket.io.
  • Created custom pages, Q&A sessions, and digital content selling interfaces.
  • Ensured high performance and cross-device compatibility.
  • Developed WebRTC system for real-time video calls between creators and users.
ReactNext.jsTypeScriptTailwind CSSSocket.ioWebRTC
TeamSquad logo

TeamSquad

Frontend Developer

Website
Houston, Texas, United States · RemoteJanuary 2021 - April 2025
  • Contributed to scalable frontend solutions for high-traffic content streaming platforms serving 150,000+ daily users.
  • Developed real-time features with Socket.io, enhancing user interaction on live content platforms.
  • Participated in Agile development cycles with 1-4 week sprints, collaborating closely with product and design teams.
  • Implemented advanced lazy-loading and code-splitting techniques, reducing initial load time by 35% and improving Core Web Vitals scores.
  • Developed multiple Progressive Web Apps (PWAs) with focus on performance and user experience.
ReactNext.jsTypeScriptTailwind CSSTwigSass+2
ShelfUp logo

ShelfUp

Current

Founder & Full Stack Developer

Website
RemoteSeptember 2024 - Present
  • Led the technical direction, full-stack development, and deployment of a scalable SaaS product platform with subscription plans and Stripe integration.
  • Modern web application for creating and managing digital showcases/online stores with QR codes, designed for businesses to create professional, easily accessible digital catalogs and storefronts.
  • Integrated AI-powered developer tools (Cursor, Claude, Codeium) to improve productivity and code quality.
  • Managed infrastructure, CI/CD pipelines, custom domain logic, and real-time analytics.
  • Built scalable infrastructure using Next.js 14, TypeScript, and Supabase.
  • Implemented responsive mobile-first design using Tailwind CSS and Radix UI components.
  • Created multilingual support (English and Spanish) using next-i18next.
  • Integrated SEO optimization with next-seo and structured data.
  • Implemented secure authentication system with role-based access controls.
  • Designed efficient database schema with optimized queries reducing load times by 40%.
  • Developed automated deployment pipeline with continuous integration and testing.
Next.jsTypeScriptSupabaseTailwind CSSRadix UIStripe+2
Devuélvelo logo

Devuélvelo

Founder & Full Stack Developer

Website
Spain
  • Built a consumer-facing web platform to centralize and clarify return policies for Spanish e-commerce stores.
  • Designed and shipped a fast, SEO-friendly Next.js application focused on discoverability and usability.
  • Implemented a scalable data model to handle store-specific return rules, exceptions, and conditions.
  • Prioritized UX clarity to reduce user friction and decision fatigue during the return process.
  • Deployed and iterated rapidly using Vercel with a production-ready CI/CD workflow.
Next.jsTypeScriptSupabaseVercelSEO

Arquinatur

Web Developer

Website
December 2018 - February 2019
  • Developed a WordPress website with a custom child theme.
  • Created a presentation website showcasing the company's services and portfolio.
WordPressPHPCSS

Skills

Technologies I work with

Frontend

JavaScriptTypeScriptHTMLCSSReactNext.jsReduxStyled ComponentsTailwind CSS

Tooling

GitGitHubAgile methodologiesRESTful APIsVercelDockerSupabaseTesting (Jest, React Testing Library)

Backend

Node.jsPHPLaravelSymfonyExpress