You will get your React or Next.js bug fixed fast, clean and tested
Project details
Got a React or Next.js bug that's slowing you down? I'll find it, fix it cleanly, and make sure it stays fixed — without breaking the rest of your app.
I'm a senior frontend & full-stack developer with 6+ years in production React/Next.js apps, including the platform behind a brand now at ~$4M in revenue. I've worked through the real stuff: state bugs, broken builds, hydration errors, API and Stripe issues, layout and responsiveness problems, and performance regressions.
What you get: a clear diagnosis of the root cause (not just a patch), a clean, tested fix, and a short note on what caused it so it doesn't come back. I write clean TypeScript, work fast, and keep you updated in plain language.
Send the bug, your repo or a zip, and steps to reproduce — I'll reply with a clear first step. Bigger issue or a small feature? Go with the Multi-Fix or Fix + Feature tier.
I'm a senior frontend & full-stack developer with 6+ years in production React/Next.js apps, including the platform behind a brand now at ~$4M in revenue. I've worked through the real stuff: state bugs, broken builds, hydration errors, API and Stripe issues, layout and responsiveness problems, and performance regressions.
What you get: a clear diagnosis of the root cause (not just a patch), a clean, tested fix, and a short note on what caused it so it doesn't come back. I write clean TypeScript, work fast, and keep you updated in plain language.
Send the bug, your repo or a zip, and steps to reproduce — I'll reply with a clear first step. Bigger issue or a small feature? Go with the Multi-Fix or Fix + Feature tier.
Programming Languages
JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance OptimizationWhat's included
| Service Tiers |
Starter
$35
|
Standard
$79
|
Advanced
$149
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 days |
Number of Revisions | 1 | 2 | 3 |
Bug Investigation | - | ||
Fix Documentation | - | ||
Detailed Code Comments | - | - |
About Serdar
Senior Frontend & Full-Stack Developer | React, Next.js & Stripe
Mary, Turkmenistan - 3:23 pm local time
6 years shipping production web apps — including the e-commerce platform behind Unidea, a brand now at ~$4M revenue.
🚀 6+ years building production web apps end to end
🛒 Built the platform behind Unidea (unidea.ru) — a custom-product brand that scaled to ~$4M (₽382M) revenue, +5.2x YoY
💳 Stripe payments — deposits, full-payment, 3DS, multi-currency, error recovery
📈 +15% checkout conversion · −35% critical bugs · +25% faster delivery (last product)
🧩 Full-stack: React/Next.js front + NestJS/Prisma/PostgreSQL back, self-hosted deploy
👥 Led & mentored frontend teams (grew a team 1 → 3, mentored 4 devs)
🔥 WHAT I DO
You're building a web product, MVP, or SaaS that needs a frontend that converts and a backend that holds up. I own it end to end — React/Next.js UI, NestJS APIs, PostgreSQL, payments, and deployment — and ship in weeks, with clean code your future team won't curse.
🔥 WHAT I BUILD
✅ Frontends that convert — multi-step onboarding, pricing & checkout, dashboards, admin panels
✅ Backends that scale — NestJS REST APIs, PostgreSQL + Prisma, Redis queues, JWT/argon2 auth
✅ Stripe billing & checkout — deposits, full-payment, subscriptions, 3DS, multi-currency
✅ Next.js apps — App Router, SSR / SSG, SEO, Core Web Vitals
✅ Quality built in — Playwright E2E, TypeScript strict, Zod validation, Swagger API docs
✅ Ship & run it — Docker, self-hosted deploy (Coolify on Ubuntu/VPS), AWS S3, CI/CD
🔥 RESULTS I'VE DELIVERED
✔ Built the e-commerce platform behind Unidea (unidea.ru) — a custom-product brand now at ~$4M (₽382M) revenue, +5.2x YoY
✔ +15% offer-to-checkout conversion on a 7-step booking funnel
✔ −35% critical regressions with Playwright E2E coverage
✔ +25% faster feature delivery using AI-assisted workflows (Claude, Codex)
✔ Shipped full-stack apps end to end — React/Next.js front, NestJS/PostgreSQL back, self-hosted deploy
🔥 HOW I WORK
I think like a product engineer, not a ticket-taker. I align on the business outcome first — who the user is and what they pay for — then ship in weekly demos with clear, written updates (async-friendly and comfortable across time zones).
1️⃣ Discovery & scope — define the MVP boundary
2️⃣ Architecture — clean, scalable foundations (FSD + TypeScript)
3️⃣ Weekly sprints with demos
4️⃣ Launch — CI/CD, tests, monitoring
5️⃣ Post-launch support
🔥 TECH STACK
Frontend: React, Next.js (App Router, SSR/SSG), TypeScript, Redux, Zustand, TanStack Query, React Hook Form, Zod, Tailwind CSS
Backend: Node.js, NestJS, REST API, Prisma, PostgreSQL, Redis, BullMQ, JWT & argon2 auth, Swagger
Payments: Stripe (Checkout, 3DS, deposits & full-payment, multi-currency)
DevOps: Docker, Coolify, Ubuntu/VPS, CI/CD, AWS S3
Quality: Playwright, GTM, Amplitude, i18n
🚀 Building a web product, MVP, or SaaS? Send a short brief via "Invite" or "Message" — I'll reply with a clear first step and a realistic timeline, no obligation.
🔍 React Developer | Next.js Developer | Full Stack Developer | Frontend Developer | Node.js Developer | NestJS Developer | TypeScript Developer | PostgreSQL | Prisma | Redis | REST API | Stripe Integration | SaaS Developer | E-commerce Developer | Web Application | Dashboard Development | Docker | Web Development
Steps for completing your project
After purchasing the project, send requirements so Serdar can start the project.
Delivery time starts when Serdar receives requirements from you.
Serdar works on your project following the steps below.
Revisions may occur after the delivery date.
Reproduce, fix, test, and deliver
I reproduce the issue, find the root cause, implement a clean fix, test it (and add a quick check where it helps), then deliver with a short note on what caused it.