Hi, my name is
Umut Korkmaz
Lead Software Engineer
Lead Full Stack Engineer with 10+ years building enterprise, commerce, and platform products end-to-end across React/Next.js, .NET, Node.js, and cloud infrastructure. I combine hands-on engineering with technical leadership — modernizing legacy systems, leading cross-functional teams, and shipping products used by thousands.
01. About Me
Lead Full Stack Engineer with 10+ years of experience building enterprise, commerce, and platform products end-to-end across React/Next.js, .NET, Node.js, and cloud infrastructure. I combine hands-on engineering with technical leadership: modernizing legacy systems, leading cross-functional teams, mentoring engineers, and shipping products that are used by thousands of users.
My background spans internal enterprise platforms, developer marketplaces, payment-enabled e-commerce, mobile apps, and high-availability infrastructure. Recent work includes leading modernization at Digiturk — moving internal systems from ASP.NET WebForms to modern React and .NET APIs, delivering a React Native employee app for managed iOS and Android devices, and contributing to AI-enabled knowledge workflows.
Strongest in React, Next.js, TypeScript, React Native · .NET / C#, Node.js, Python / FastAPI · system design, microservices, CI/CD, cloud infrastructure · team leadership, mentoring, platform modernization, and AI integration. I enjoy turning ambiguous business problems into reliable software that ships.
Proven track record integrating payment systems across multiple gateways, running high-availability infrastructure with load balancing and cloud deployments, and building AI-powered features including virtual assistants with Small Language Models and intelligent matching systems. Passionate about AI-assisted development — GitHub Copilot, Claude, and Cursor daily.
Frontend
Backend
Data & Messaging
Cloud & Infra
AI & ML
AI Dev Tools
Architecture & Quality
Payments
02. Experience
Lead Software Engineer
- >Led modernization of DigiFlow, an internal workflow platform with ~100 workflows, from ASP.NET 3.5 WebForms to React and .NET 10 API, significantly reducing page load times, decreasing support tickets, and improving maintainability for all employee-facing operations.
- >Delivered DigiPort App, a React Native (New Architecture) mobile app replacing the legacy system for announcements, events, and workflow access on managed iOS and Android devices, processing 20+ company-wide events monthly.
- >Architecting an AI-powered virtual assistant combining fine-tuned Small Language Models (SLMs) to help employees access company knowledge through natural language — currently in development with custom model training pipeline.
- >Mentored engineers (junior and senior) in React, .NET API development, and modern Git workflows, leading the team's migration from TFS to Git-based version control.
Lead Software Engineer
- >Led an engineering team (frontend and backend) building a multi-module B2B supply-chain and e-commerce platform across 40+ industry categories and a catalog of 10,000+ product categories.
- >Architected the platform using React, Next.js, TypeScript, Node.js, .NET Core, Entity Framework, Mantine UI, Zustand, and SQL Server with three distinct trade models for different business workflows.
- >Coordinated cross-functional delivery including code reviews, pull requests, CI/CD pipelines, and testing practices across agile sprints.
Senior Software Engineer
- > Yazılımcı Bul — Spearheaded development of Turkey's developer marketplace platform (yazilimcibul.com). Built AI-powered features for intelligent developer matching, automated project analysis, budget/timeline estimation, CV-based skill scoring, and an admin panel with escrow and dispute management. Stack: React, Node.js, Express, MongoDB.
- > Kapsül Mobilya — Built an interactive furniture e-commerce platform with a real-time 3D customizer using Babylon.js, enabling customers to configure products visually before purchase with integrated payment processing via iyzico. Stack: React, TypeScript, .NET Core, Babylon.js.
- > E-Export City — Developed a digital export portal enabling Turkish businesses to reach global markets, featuring catalog management, inquiry workflows, tiered memberships, and admin tooling for cross-border sales enablement. Stack: React, Node.js, Express, MongoDB, Redis.
- > And more — Delivered additional web and mobile applications across multiple clients.
Full Stack Software Engineer / Team Lead
- >Designed and built a hosting, domain, and server management platform comparable in scope to WHMCS. Stack: React, Next.js, Node.js, Python, FastAPI, PostgreSQL, Redis.
- >Implemented high-availability infrastructure achieving 99.9% uptime, using HAProxy, Patroni, PgBouncer, etcd, keepalived, Nginx, and Bind9.
- >Built real-time customer support features via WebSockets and webhook integrations, and developed a React Native mobile companion app for customer account management.
Full Stack Software Developer
- >Developed web applications and business websites using C# / .NET MVC, PHP, Laravel, jQuery, SQL Server, and MySQL.
- >Led delivery of an internal CRM application supporting sales-management workflows and improved online visibility through SEO and Google Ads initiatives.
Earlier Experience
03. Education
Bachelor of Engineering
Computer Engineering
İstanbul Kültür University
İstanbul, Turkey
Associate's Degree
Computer Programming
İstanbul Kültür University
İstanbul, Turkey
Teaching & Mentorship
04. Featured Projects
Featured Project · 2023 - Present
Digiflow
A comprehensive workflow modernization project for Digiturk, upgrading ~100 critical legacy workflows from ASP.NET 3.5 to a modern stack using React and .NET 10 API. Streamlines internal processes and is extensively used by company employees.
Featured Project · 2023 - Present
DigiPort App
A cross-platform mobile portal application (iOS & Android) built with React Native for Digiturk employees. Provides seamless access to company announcements, events, and workflows, replacing the legacy system as a unified internal communication hub.
Featured Project · 2026 - Present
EchoSafe
A digital legacy and security mobile app that delivers user-curated content to designated recipients under defined trigger scenarios.
A 24/7 courier & logistics platform for motorcycle and vehicle couriers serving individual and corporate customers. Features shipment creation, real-time package tracking, ETA calculations, and tiered corporate pricing — optimized for intra-city deliveries in Istanbul.
Featured Project · 2025 - Present
CodePulse
A VS Code extension for automatic developer time tracking and productivity analytics — a privacy-first alternative to WakaTime. Ships with a local SQLite store, heartbeat monitoring, idle detection, language/project breakdowns, keystroke velocity and code-churn insights, and an optional REST API for external integrations.
Turkey's developer marketplace platform connecting clients with software developers. Features AI-powered developer matching, automated project analysis, budget/timeline estimation, CV-based skill scoring, and a robust admin panel with escrow and dispute management.
An interactive e-commerce platform for custom furniture with a real-time 3D configurator powered by Babylon.js. Customers can visually customize products before purchase with integrated payment processing via iyzico.
A digital export portal enabling Turkish businesses to reach global markets. Features catalog management, inquiry workflows, tiered memberships (Bronze, Silver, Gold), and admin tooling for cross-border sales enablement.
Multi-module B2B supply-chain and e-commerce platform with three distinct trade models tailored to different business workflows. Led an engineering team across frontend and backend, covering 40+ industry categories and a catalog of 10,000+ product categories. Coordinated code reviews, PR workflow, CI/CD pipelines, and testing practices across agile sprints.
Hosting, domain, server, and customer-management platform supporting commercial operations — comparable in scope to WHMCS. Runs on a high-availability stack achieving 99.9% uptime using HAProxy, Patroni, PgBouncer, etcd, keepalived, and Bind9.
Open-source .NET library shipping two NuGet packages: Meridian.Mediator (CQRS-style in-process request/response, notifications, streams, and pipeline behaviors) and Meridian.Mapping (object-to-object mapping with profiles, resolvers, converters, and query projection). Targets .NET 8–11.
Latest Articles
MCP Servers in Production: Patterns From Real Deployments
Production patterns for MCP server design: transport choices, scoped tool surface, recoverable error messages, auth that does not leak, observability, and knowing when not to build one.
Shipping Meridian: An Open-Source .NET Mediator and Mapper
Releasing Meridian, a compact .NET library with a CQRS mediator and object mapper: small public surface, strong test discipline, and a release workflow that ships reliably.
Evaluating Coding Agents: Building a Rubric That Scales
A five-axis rubric for evaluating coding agents that survives model releases: correctness, minimality, adherence, verification, and cost, measured across a stratified sample of real tasks.
06. What's Next?
Get In Touch
I'm currently open to new opportunities and exciting projects. Whether you need a senior full-stack engineer for your team, want to collaborate on AI integrations, payment systems, or a project that needs a real-time web experience — I'd love to hear from you!