Case Study · Founder & Full-Stack Developer · 2026
Celina: a live two-sided marketplace, built solo, from first commit to production
Celina (celinaeda.ru) is a consumer marketplace connecting home cooks with customers. I built every layer of it — product design, frontend, backend, infrastructure, SEO, and analytics — and operate it in production. It's the most honest portfolio piece a developer can show you: a real business system running in production, not a demo.
The challenge
A two-sided marketplace is one of the hardest things to ship as a solo developer. It needs seller onboarding with identity verification, a catalog customers trust, ordering with real-time status, security that protects both sides, and — the part most builds skip — the ability to be found: a marketplace nobody discovers on Google is dead on arrival.
What I built
Frontend that search engines love
- React 18 + TypeScript with Vite static-site generation — 56 prerendered SEO landing pages, bilingual, fully indexed by Google and Yandex.
- Automated instant indexing (IndexNow) on every deploy, so new pages appear in search within hours, not weeks.
Backend that handles real money and real identity
- Node.js + Express + Prisma: order lifecycle with real-time status tracking from "placed" to "delivered".
- KYC identity verification for cooks — document upload and review workflow.
- Multi-device session security with remote sign-out; role-separated access enforced server-side.
Infrastructure that runs itself
- Docker + nginx + Let's Encrypt on a VPS, automated deploy pipeline, daily automated backups.
- Full conversion funnel in analytics: traffic → catalog → order, with search-console data feeding decisions.
Results
What this means for your project
Everything expensive about your project — authentication, payments-ready order flows, verification, deployment, SEO — I have already solved in production under my own name. You're not paying me to learn on your budget.