Alin Cristea

Senior Frontend Developer

Profile photo

Alin Cristea

Senior Frontend Developer building polished products with Next.js, TypeScript and design systems.

Spain / Remote

About

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

Senior frontend developer focused on React, Next.js, TypeScript and scalable UI systems. I turn complex product ideas into interfaces that feel calm, responsive and easy to extend.

CurrentSenior Frontend at Service Club
FocusProduct UI, performance, design systems

5+

years shipping web products

150k+

daily users on products served

3

personal products launched

Selected Work

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

ShelfUp project visual
PersonalArchived2024-2026

ShelfUp

A shipped SaaS product for creating branded mobile storefronts, organizing catalogs and sharing them through QR codes.

ShelfUp reached a complete subscription-product implementation with Free and Pro tiers before being archived when it did not achieve sufficient adoption.

Next.jsTypeScriptSupabaseTailwind CSSRadix UI+1
Devuélvelo project visual
PersonalArchived2025-2026

Devuélvelo

A shipped consumer SaaS that calculated return deadlines, organized proof of purchase and surfaced reminders before windows expired.

Devuélvelo shipped the calculator, purchase dashboard, ticket attachments, calendar feeds and reminder system before being archived when it did not achieve sufficient adoption.

Next.jsTypeScriptTailwind CSSSupabaseVercel
Dooyu logo

Dooyu

CompanyLive2024

Dooyu

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

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

ReactNext.jsTypeScriptTailwind CSSSocket.io+1

What I Bring

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

01

Product thinking

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

02

Scalable UI

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

03

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.

May 2025 - Present

Barcelona, Catalonia, Spain · Remote

Service Club logo

Service Club

Current

Senior Frontend Developer

Website
  • 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.
ReactNext.jsTypeScriptTurborepoTailwind CSSRadix UICVARedux Toolkit+7

April 2024 - April 2025

Dooyu logo

Dooyu

Senior Frontend Developer

Website
  • 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.
ReactNext.jsTypeScriptTailwind CSSSocket.ioWebRTC

January 2021 - April 2025

Houston, Texas, United States · Remote

TeamSquad logo

TeamSquad

Frontend Developer

Website
  • 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.
ReactNext.jsTypeScriptTailwind CSSTwigSassSocket.ioPWA

September 2024 - August 2026

Remote

ShelfUp logo

ShelfUp

Founder & Full Stack Developer

Case study
  • Built and launched a SaaS for creating mobile digital catalogs and sharing them through QR codes.
  • Designed the responsive store editor, public storefront, category and product management, and media upload flows.
  • Implemented English/Spanish localization, structured data, generated sitemaps and customizable store themes.
Next.jsTypeScriptSupabaseTailwind CSSRadix UIStripenext-i18nextCI/CD

August 2026

Spain

Devuélvelo logo

Devuélvelo

Founder & Full Stack Developer

Case study
  • Built and launched a Spanish consumer product for calculating and tracking purchase return deadlines.
  • Created the public calculator, purchase dashboard, ticket attachments, retailer data and calendar feeds.
  • Implemented Supabase Auth/PostgreSQL/Storage, scheduled Resend reminders and Stripe plan gates.
Next.jsTypeScriptSupabaseVercelSEO

December 2018 - February 2019

Arquinatur

Web Developer

Website
  • 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