Cantürk Çelikok
About

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.

Cantürk Çelikok
Experience
6+ years
Live products
4
Industries
4
Location
Ankara, Türkiye
Experience

6+ years of building, and real project experience

2024 - Present

Independent Product Development

Nerdesin, PlusTurk and Ayda POS

2023 - Present

Business SaaS Projects

Call centre, debt collection and payment systems

2022 - 2024

Desktop App Development

Tools for the Windows platform

2020 - Present

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.
Next.jsTypeScriptNode.jsPostgreSQLElectron
Learning & Research

Continuous learning

  1. 2019 - Present

    Continuous Hands-on Learning

    Full stack web and desktop development

  2. 2021 - 2023

    Professional Training

    React, Next.js and TypeScript

  3. 2022 - 2024

    Systems and Infrastructure

    Linux, Docker and deployment

  4. 2024 - 2026

    Product Development Practice

    SaaS, POS and desktop distribution

Research & development

  1. 2025 - 2026

    Desktop Automation Techniques

    Native integration and performance

  2. 2024 - 2026

    Payment Infrastructure Security

    PCI-compliant flows and 3D Secure

  3. 2023 - 2026

    Scalable SaaS Architecture

    Multi-tenant systems

Technologies

Tools I use every day

Next.js
Node.js
PostgreSQL
React
TypeScript
Tailwind CSS
Electron
Next.js
Node.js
PostgreSQL
React
TypeScript
Tailwind CSS
Electron

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