I build web, mobile and backend, start to finish.
I'm Mert, a fullstack developer. I build e-commerce, payments and ERP-connected apps with Next.js, React Native and Node.js. I work remotely from Turkey.
For a faster reply, message me directly:
I've worked on projects for Boyner (through PATH), Harmoni Yazılım, Qrispy, Hopgogo and SubmitApp.
How I work
I reply fast
I care about answering quickly. The easiest way to reach me is WhatsApp.
Easy to reach
Email, the form or WhatsApp. Use whichever suits you.
Your satisfaction comes first
Customer satisfaction is how I measure the work. Finishing is not enough; it has to be useful.
I modernize old systems
I study old or undocumented applications, work out how they behave, and move them to a modern setup.
What I do
- Web apps and e-commerce
- Storefronts, admin panels and customer portals with Next.js and React. Payments with Stripe or QNBPay, and integrations with ERP systems such as Uyumsoft.
- Mobile apps
- Mobile apps with React Native and Expo. Turborepo monorepos so web and mobile share packages.
- Backend and integrations
- APIs with Node.js, NestJS and .NET. PostgreSQL and MySQL databases. Integrations with Stripe, QNBPay, Telnyx and AWS services.
- Hosting and migrations
- VPS setup and self-hosting, moving off AWS managed services to cut cost, deployment on Railway and Neon. Moving from Create React App to Vite, and technical SEO.
- Modernizing old applications
- I study an old or undocumented application, work out how it behaves, and move it to a modern setup while keeping that behavior. For applications you own or have the right to change.
How we start
Write to me
Describe your project briefly on WhatsApp, by email or with the form.
We pin down the scope
Together we decide what you need and what the first version must include.
Quote
We talk about price and timeline based on that scope.
Build and delivery
I build it, test it and put it live.
Work
Harmoni Yazılım: storefronts, B2B app and ERP integration
June 2024 - present
Built Next.js B2C storefronts and React/Vite B2B management apps integrated with Uyumsoft ERP. Integrated QNBPay for payment collection and passed the 3D Secure flow to the frontend. Built inventory, order and customer workflows, and handled technical SEO and Google Search Console.
Stack: Next.js, React, Vite, TypeScript, Zustand, TanStack Query, QNBPay
Harmoni Yazılım: after-sales service
June 2024 - present
Built a web interface and an Android app (React Native and Expo) for service-request tracking, repair records, photo uploads and OTP-confirmed delivery to customers.
Stack: React, Vite, React Native, Expo, TypeScript
Qrispy: web and mobile product
Feb 2024 - present
Set up a Turborepo monorepo with shared packages for web and mobile. Built Next.js admin and customer dashboards and rebuilt the mobile app with Expo and React Native. Built Stripe checkout and subscriptions, and backend services with NestJS, TypeORM and MySQL. Moved AWS managed services to a VPS to reduce cost. Integrated translation and speech-to-text with AWS services and Telnyx.
Stack: Next.js, TypeScript, React Native, Expo, Turborepo, NestJS, TypeORM, MySQL, Stripe, AWS, Telnyx
Hopgogo: travel planning platform
Aug 2025 - Nov 2025
Built a travel planning platform with customizable multi-destination itineraries for transport, accommodation and activities. Implemented booking, reservations and Stripe checkout, plus authentication, traveler profiles, saved payment methods and purchase history.
Stack: Next.js, TypeScript, Zustand, TanStack Query, React Hook Form, Tailwind CSS, Stripe
Boyner: product pages and merchant portal
Feb 2023 - Feb 2025, through PATH
Rebuilt the product listing and product detail pages of Boyner's e-commerce platform. Built merchant portal features for coupons, notifications and order management. Gathered requirements directly from merchants and wrote reusable React components.
Stack: React, Next.js, TypeScript, Redux Toolkit, Tailwind CSS
SubmitApp: Vite migration and SEO
May 2022 - Dec 2024
Moved the frontend from Create React App to Vite and tripled build performance. Restructured the frontend architecture and raised the Lighthouse SEO score from 50% to 98%. Moved landing pages to Next.js for technical SEO, and built dynamic PDF generation with React-PDF and multilingual support with i18next.
Stack: React, Next.js, Vite, React Router, Zustand, TanStack Query, Tailwind CSS, React-PDF, i18next
Experience
Harmoni Yazılım Fullstack developer, freelance, Remote
June 2024 - present
Qrispy Fullstack developer, freelance, Remote
Feb 2024 - present
Hopgogo Fullstack developer, freelance, Remote
Aug 2025 - Nov 2025
PATH Product & Software House (Boyner) Frontend developer, Remote
Feb 2023 - Feb 2025
SubmitApp Frontend developer, freelance, Remote
May 2022 - Dec 2024
Fdnsoft Frontend developer, Ankara
Dec 2021 - May 2022
Softtech Frontend developer, Remote
June 2021 - Dec 2021
Education
Bilkent University BSc, Computer Technology and Information Systems
2015 - 2020
METU Development Foundation Private High School High school
2011 - 2015
Languages
Turkish native, English professional.
Skills
- Web and mobile
- React, Next.js, React Native, Expo, TypeScript, JavaScript, Vue, HTML, CSS, Tailwind CSS
- Backend
- Node.js, NestJS, .NET, REST APIs
- Databases and ORMs
- PostgreSQL, MySQL, Prisma, Drizzle, TypeORM
- Cloud and deployment
- VPS setup, self-hosting, Railway, Neon, AWS
- Payments and integrations
- Stripe, QNBPay, Telnyx, Uyumsoft ERP, Google Search Console
- Tooling
- Zustand, TanStack Query, Redux Toolkit, React Hook Form, Turborepo, Vite, Git
Questions
How do you price projects?
By scope. Describe your project briefly, we'll pin down what's needed, and I'll send a quote.
Which languages do you work in?
Turkish and English. Turkish is my native language and my English is professional.
Can you join an existing project?
Yes. I've rebuilt Boyner's product pages and the Turkish Tennis Federation's applications, and moved a project from Create React App to Vite.
Do you handle hosting and deployment too?
Yes. I have experience with VPS setup, self-hosting, and deploying on Railway and Neon. At Qrispy I moved AWS managed services to a VPS to reduce cost.
How fast do you reply?
I care about answering quickly. The fastest way is WhatsApp: +90 539 980 47 25.
Can you modernize an old application?
Yes. I've studied old applications, worked out how they behave, and modernized them. You can write to me about applications you own or have the right to change.
How do we start?
Fill in the form below or email me directly. Your project, your goal and a date if you have one is enough.
Contact
Name and email are enough. Add a phone number and a project note if you like. Write to me for pricing and we'll pin it down together.
Or write directly: myyilmaz97@gmail.com, WhatsApp +90 539 980 47 25