I build production-grade, scalable systems with Next.js, ASP.NET Core, and Node.js. I've independently architected and shipped 8+ commercial platforms, consistently delivering Lighthouse 95+ and SEO 100/100.
I develop scalable, fast, and reliable systems with React, Next.js, ASP.NET Core, Node.js, and TypeScript. Every line of code runs in a live system real users depend on.
A full-stack technology set spanning frontend, backend, databases, and deployment. Every technology here has been tested in production, on real projects.





































Live commercial platforms with real users - not mockups, working systems.
Pinned repositories and my contribution graph - the code I write, straight from the source.
I'm a full stack software engineer who builds systems that run in production with real users. I've independently architected and shipped 8+ commercial platforms with Next.js, ASP.NET Core, and Node.js.
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<h2>My Approach</h2>
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Before I solve a problem, I try to genuinely understand it: the data model, the concurrency scenarios, where the system will break as it grows. Writing code is the last step for me — the architectural decision is the critical one.
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<h3>My Engineering Approach</h3>
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I design systems built on Clean Architecture, SOLID principles, and testability. Given a choice between shipping a feature fast and being able to extend it three months later without breaking it, I always choose the latter.
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<h4>How I Solve Problems</h4>
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I approach hard technical problems — IDOR, TOCTOU stock race conditions, real-time synchronization — with concrete engineering solutions: isolation levels, backplanes, rate limiting. Not assumptions, measurable decisions._
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8+ commercial platforms: multi-tenant marketplaces, real-time appointment systems, compliance-grade enterprise exam platforms, and e-commerce systems with production payment infrastructure. All shipped at Lighthouse 95+.
.jhun comes from Ceyhun Turkmen's name and makes a playful nod to JSON format: the dot suggests objects and the curly braces represent data blocks. The name and the logo reflect my modern, minimal and tech-focused identity both visually and conceptually.
The navy color symbolizes the night sky's infinity in web design. The navy in the .jhun logo represents the inspiring order of stars and my boundless curiosity.
"Code is the last step of solving a problem — I understand the problem first."
A summary of the systems I've independently architected and shipped.
Production Platforms
Projects Shipped
Lighthouse Score
Full Stack
Feedback from clients on the systems I've shipped for them.
I'm here for open roles, technical collaboration, architecture questions, or just talking engineering.