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.

giris.tsx

<section id="giris">
  <h2>My Approach</h2>
  <p>
    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.
  </p>

  <h3>My Engineering Approach</h3>
  <p>
    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.
  </p>
</section>

vizyon.tsx

<div id="vizyon">
  <h4>How I Solve Problems</h4>
  <p>
    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._
  </p>
</div>

.jhun{}

What I've Built

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+.

Where does my logo come from?

.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."

Download CV

By the Numbers

A summary of the systems I've independently architected and shipped.

Production Platforms

20+

Projects Shipped

95+

Lighthouse Score

Full Stack

Engineering Philosophy

The principles that guide how I write code.

Clean Architecture & SOLID

I separate layers with clear boundaries; on BAZR I kept a 33-entity domain model manageable this way with CQRS/MediatR.

Scalability

I don't build real-time systems bound to a single instance; on Rezervo and BAZR I designed for horizontal scaling from day one with a Redis-backed SignalR backplane.

Performance

Core Web Vitals and Lighthouse scores aren't a bonus, they're part of the deliverable — I've kept 95+ consistently across the projects I've shipped.

Accessibility

I test interfaces with keyboard navigation; aria labels and semantic HTML are a default starting point, not a layer added afterward.

Developer Experience

Type safety, a consistent folder structure, a readable commit history — that's the standard I hold myself to for code I'll reopen a year later.

Testability

xUnit/Moq on the .NET side, Jest/Supertest on Node — I don't ship critical business logic (payments, stock, authorization) to production untested.

Code Quality

FluentValidation, Zod, and Serilog structured logging — I want to catch failures in the logs before a user has to report them.

Problem Solving

I work out the data model and concurrency scenarios first; that's how TavAkademi's exam-integrity system and BAZR's stock race condition got solved.

Experience

Systems I've independently architected and shipped since 2024.

Software Engineer — Independent & Contract

Remote · 2024 – Present

Architected, built, and independently shipped 8+ production-grade commercial platforms, owning the full lifecycle from requirements to CI/CD deployment.
Optimized PostgreSQL/MySQL query performance through targeted indexing strategy and query tuning; introduced Serilog structured logging for systematic error tracking.
Delivered 20+ production software projects for international clients with a 99% client satisfaction rate; recognized on Bionluk's Rising Stars and Most Loved Freelancers lists.

Next.jsASP.NET CoreNode.jsPostgreSQLMySQLPrismaRedisDockerNginxVPS

Featured Engagements

2025

TAV Security — TavAkademi

Corporate Training & Exam Platform

JWT-RBAC with TOTP/2FA and GeoIP session validation for airport security personnel, a polygon-editor X-Ray exam simulation, and automated certificate generation.

ReactRedux ToolkitNode.jsExpress.jsMySQLSpeakeasy (TOTP)

2025 – 2026

E-Commerce Platforms

6 Active Commercial Projects

IşPool, Balkolüx, Ferudun Polat Home, NowArt Plicell, RosallieBaby, BarScarf — 6 live platforms with iyzico payments, KVKK-compliant auth, and Meta CAPI/GA4 conversion tracking.

Next.jsPrismaPostgreSQLMySQLNextAuth.jsCloudinary

2026 · Contract (Upwork)

BAZR

Multi-Tenant Marketplace

Clean Architecture/CQRS 33-entity domain model, Stripe payments + escrow wallet, real-time order tracking via SignalR + Hangfire.

ASP.NET CorePostgreSQLRedisCQRS/MediatRStripeSignalR

Technical Skills

Grouped by category — technologies I use in production.

Frontend

CSS5y
HTML55y
React4y
Bootstrap3y
Next.js3y
Tailwind CSS3y
Redux Toolkit2y
Vite2y
shadcn/ui1y

Backend

Node.js4y
Express3y
EJS2y
Handlebars.js1y
ASP.NET Core1y
Stripe1y

Database

MongoDB3y
Mongoose3y
MySQL3y
PostgreSQL2y
Prisma2y
Sequelize2y
Redis1y

DevOps

Docker2y
Vercel2y
Railway1y
Render1y

Language

JavaScript5y
TypeScript3y

CMS

WordPress2y

Integrations & Tools

C#EF CoreFramer MotionGSAPiyzicoSignalRHangfireDocker ComposeGitHub ActionsSwagger/OpenAPICloudinaryTwilio SMSSendGridAnthropic Claude APIGoogle GeminixUnitJest

Resume

Education, certifications, and languages.

Education

B.Sc. Computer Engineering

Iskenderun Technical University

2020 – 2024

Certifications

Full Stack Development Bootcamp
Advanced React and Next.js
Prisma and SQL Advanced Database Management

Languages

Turkish — Native
English — B2 - Upper-Intermediate & Technical Fluency

Download CV (PDF)

{ }

<section id="giris"> <h2>My Approach</h2> <p> 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. </p> <h3>My Engineering Approach</h3> <p> 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. </p> </section>

<div id="vizyon"> <h4>How I Solve Problems</h4> <p> 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._ </p> </div>

What I've Built

Where does my logo come from?

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."