Alin Cristea | Full Stack Developer

About

I design and build fast, maintainable web products for teams that care about craft.

I am a senior frontend developer focused on React, Next.js, TypeScript and scalable UI systems. I enjoy turning complex product ideas into interfaces that feel calm, responsive and easy to extend.

Current

Senior Frontend @ Service Club

Focus

Product UI, performance, design systems

Building

SaaS tools and founder-led products

See projects

years shipping web products

150k+

daily users on products served

personal products launched

Selected Work

Projects that show the mix of product thinking, frontend craft and full-stack execution.

Live

ShelfUp

Founder & Full Stack Developer

Next.js

TypeScript

Supabase

PersonalLive2024

ShelfUp

A SaaS for small businesses to create branded storefronts, organize products and share them through a QR code.

Value

Shipped as a subscription product with Free and Pro plans, where Pro adds up to two stores, unlimited categories and products, advanced design control and QR logo branding.

Next.jsTypeScriptSupabaseTailwind CSSRadix UI+1

Read case study Visit live site

Live

Devuélvelo

Founder & Full Stack Developer

Next.js

TypeScript

Tailwind CSS

PersonalLive2025

Devuélvelo

A SaaS that calculates return deadlines automatically, keeps purchase records organized and warns you when a return is close to expiring.

Value

Built around a Free plan with up to five active purchases and a Pro plan for unlimited tracking through Stripe.

Next.jsTypeScriptTailwind CSSSupabaseVercel

Read case study Visit live site

Live

Dooyu

Senior Frontend Developer

React

Next.js

TypeScript

CompanyLive2024

Dooyu

A product delivery role focused on responsive creator pages, Q&A flows and real-time communication features.

Value

Contributed to user-facing surfaces across creator pages, Q&A sessions and live communication.

ReactNext.jsTypeScriptTailwind CSSSocket.io+1

Read case study Visit live site

What I Bring

The way I move from product ambiguity to production-quality interfaces.

Product thinking

I care about the job the interface needs to do, not just the component it needs to render.

Scalable UI

I build patterns, primitives and design-system foundations that teams can keep extending.

Shipping quality

I balance speed with maintainability, performance and the small details that make products feel polished.

Experience

Selected work across product teams, SaaS platforms and founder-led projects.

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).

ReactNext.jsTypeScriptTurborepoTailwind CSSRadix UICVARedux Toolkit+7

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.

ReactNext.jsTypeScriptTailwind CSSSocket.ioWebRTC

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.

ReactNext.jsTypeScriptTailwind CSSTwigSassSocket.ioPWA

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.

Next.jsTypeScriptSupabaseTailwind CSSRadix UIStripenext-i18nextCI/CD

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.

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

The stack I reach for when quality, speed and maintainability matter.

Frontend

Interfaces, app architecture and component systems.

TypeScriptReactNext.jsTailwind CSSReduxRadix UICVAFramer Motion

Product Engineering

The systems around shipping reliable product work.

Design systemsPerformanceAccessibilityTestingStorybookReact QueryZod

Full Stack

Backend and infrastructure when the product needs it.

Node.jsSupabaseDockerVercelStripeREST APIsPHP