Full Stack Developer with 2+ years of experience building production web applications across e-commerce, enterprise systems, marketplaces, and training platforms. I specialize in ASP.NET Core, Node.js, and Next.js, with hands-on work in backend architecture, API design, security, CI/CD, and production operations.

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

6 live commercial storefronts, a server-authoritative multiplayer strategy game resolving combat on a 250 ms tick over SignalR, a multi-tenant marketplace on Clean Architecture/CQRS, and an enterprise exam platform for airport security personnel.

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

The production work on my CV, in numbers.

Live E-Commerce Storefronts

20+

Projects Delivered

95+

Lighthouse Score

Years in Production

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

The teams I've worked with and the systems I've shipped since 2024.

Full Stack Developer

Appricode API and Software Consultancy · London (Remote)

Aug 2025 – Sep 2026

Designed and delivered production web applications for international clients, owning implementation from requirements and data modeling through REST API design, frontend architecture, and deployment.
Built Docker + GitHub Actions CI/CD workflows and optimized Next.js SSR/ISR applications, sustaining Lighthouse 95+ on live commercial platforms.

Next.jsASP.NET CoreTypeScriptDockerGitHub ActionsPostgreSQL

Full Stack Developer

Feyzioğlu Industry and Trade Co. Ltd · Turkey

Sep 2024 – Aug 2025

Replaced spreadsheet-driven operations with centralized internal systems covering four core workflows — orders, inventory, reporting, and documents — backed by custom database and REST API design.
Implemented role-based access, structured logging, backups, and production maintenance to improve operational control and system traceability.

Node.jsExpress.jsMySQLReactREST APIRBAC

Full Stack Developer (Contract)

TAV Güvenlik · Turkey (Remote)

Aug 2024 – Sep 2024

Implemented JWT-based RBAC, TOTP/2FA, and GeoIP session validation across three role tiers — Admin, Trainer, and Personnel.
Built exam-integrity and certification workflows including tab-switch enforcement, automated PDF/DOCX generation, and QR-based certificate verification.

ReactRedux ToolkitNode.jsExpress.jsMySQLSpeakeasy (TOTP)

Freelance Full Stack Developer

Freelance · Turkey (Remote)

Jan 2024 – Aug 2024

Delivered 20+ production projects across e-commerce, corporate, and internal business applications for clients in Turkey and abroad.
Owned projects from requirements and technical planning through full-stack implementation, database integration, deployment, and post-launch support.

Next.jsReactNode.jsPHPMySQLMongoDB

Featured Projects

2025 – 2026

E-Commerce Platforms

6 Live Commercial Storefronts

İşPool, Balkolüx, Ferudun Polat Home, NowArt Plicell, RosallieBaby, BarScarf — six live storefronts on Next.js with iyzico payments, KVKK-compliant checkout, real-time Horoz Kargo shipment tracking, and a canvas-based product customization tool. Lighthouse 95+ via SSR/ISR.

Next.jsPrismaPostgreSQLMySQLiyzicoCloudinary

2026 · Client Project

WinToWar

Real-Time Multiplayer Strategy Game

Server-authoritative multiplayer strategy game on ASP.NET Core and Next.js, resolving all combat on a 250 ms game tick broadcast over SignalR. Includes a USD wallet with Litecoin deposits and payouts via BTCPay Server, JWT auth with rotating refresh tokens, an RBAC admin panel, and 189 xUnit tests.

ASP.NET CoreNext.jsSignalRBTCPay ServerJWTxUnit

2026 · Client Project

BAZR

Multi-Tenant Marketplace Platform

Multi-vendor marketplace on ASP.NET Core using Clean Architecture and CQRS (MediatR) across a 33-entity domain, with a Next.js frontend for Consumer, Merchant, Courier, and Admin roles. Stripe payments, an escrow wallet, and real-time order tracking via SignalR and 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

Backend Development with ASP.NET Core
REST API Development with Node.js & Express
React & Next.js
Docker & CI/CD Pipelines
Software Architecture & Design Patterns

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."