I write software with the business outcome in mind
I'm Cantürk Çelikok, a freelance full stack software developer based in Ankara, Türkiye. I've been building web and desktop software for more than six years. A law firm's debt collection workflow, a café's orders, the payment system behind a SaaS product: I treat each of them with the same care, because there's a real business and real users behind every one.
The 4 products in my portfolio aren't a showcase. They're still live, with real users. So when I quote for a project I don't say "in theory it's possible". I've built something similar before and I know what works. You can see the work I take on under services, and the notes I took from these projects on the blog.
I work with clients in Türkiye and abroad, in English or Turkish, remotely and across time zones.
Some of my code is on my GitHub profile.
- Experience
- 6+ years
- Live products
- 4
- Industries
- 4
- Location
- Ankara, Türkiye
6+ years of building, and real project experience
Independent Product Development
Nerdesin, PlusTurk and Ayda POS
Business SaaS Projects
Call centre, debt collection and payment systems
Desktop App Development
Tools for the Windows platform
Freelance Software Consulting
Business websites and digitalisation projects
How I work
- I've owned products end to end, from the idea to live users, designing not just the code but the business process and the customer experience.
- I've securely integrated third-party systems such as payment gateways (iyzico, PayTR, Stripe, Nestpay), SMS and call centre infrastructure.
- I've built simple, easy-to-learn interfaces for very different users, from law firms and cafés to field teams and kitchen staff.
Continuous learning
- 2019 - Present
Continuous Hands-on Learning
Full stack web and desktop development
- 2021 - 2023
Professional Training
React, Next.js and TypeScript
- 2022 - 2024
Systems and Infrastructure
Linux, Docker and deployment
- 2024 - 2026
Product Development Practice
SaaS, POS and desktop distribution
Research & development
- 2025 - 2026
Desktop Automation Techniques
Native integration and performance
- 2024 - 2026
Payment Infrastructure Security
PCI-compliant flows and 3D Secure
- 2023 - 2026
Scalable SaaS Architecture
Multi-tenant systems
Tools I use every day
Front-end
- Next.js
- React
- TypeScript
- Tailwind CSS
- Electron
Back-end
- Node.js
- REST API
- WebRTC
Databases
- PostgreSQL
- MySQL
- Redis
- SQLite
Tools & platforms
- Git
- Docker
- Linux
- Nginx
Integrations
- iyzico / PayTR / Stripe
- SMS & Call Infrastructure
- SEO