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onurkarakus/README.md
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👨‍💻 About Me

Hi, I'm Onur — a Senior Software Developer specializing in scalable distributed systems and Cloud-Native architectures.

I solve complex business problems using the .NET ecosystem, Modular Monoliths, Vertical Slice Architecture, and Domain-Driven Design (DDD) principles.

Currently exploring AI Agents (Semantic Kernel) and .NET Aspire to automate operational processes.

🏆 Microsoft Certifications

  • Microsoft Certified Professional
  • Microsoft Specialist: Programming in C#

Microsoft Transcript

🛠️ Tech Stack

Backend & Architecture
.NET C# Vertical Slice DDD Modular Monolith Clean Architecture CQRS

Cloud & Infrastructure
Azure Docker Kubernetes PostgreSQL SQL Server Redis

Frontend & Mobile
Next.js Flutter TypeScript

AI & Observability
Semantic Kernel OpenTelemetry

🚀 Featured Projects

Subify OS

Self-hosted subscription & personal finance tracker.
Clean Architecture · .NET · Next.js · PostgreSQL · Docker · AI (BYOK) · Multi-user

Isotope.ABTesting

Modern high-performance .NET A/B Testing library.
Fluent API · Redis · MurmurHash3 · Fail-Open · Zero-allocation paths

AegisAuth

Multi-tenant authentication & authorization API + Admin Portal.
Secure registration · Token management · Tenant isolation

OAuth2 + Refresh Token API

JWT Access + Refresh Token Rotation · PBKDF2 · Rate Limiting · Clean Architecture · Full test coverage

Other notable projects:


"The code you write makes you a programmer. The code you delete makes you a good one."


Portfolio

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  1. SubifyProject SubifyProject Public

    Self-hosted subscription & personal finance tracker. No freemium. BYOK AI & SMTP. .NET + Next.js + PostgreSQL.

    C#

  2. Isotope.ABTesting Isotope.ABTesting Public

    Modern high-performance .NET A/B testing library with Fluent API, MurmurHash3 deterministic allocation, Redis support and Fail-Open resilience.

    C#

  3. AegisAuth AegisAuth Public

    Multi-tenant authentication & authorization platform built with Clean Architecture. Features secure registration, JWT/OAuth tokens, refresh tokens, roles & scopes, and a Blazor admin portal.

    C# 1

  4. dotnet-vertical-slice-template dotnet-vertical-slice-template Public

    A production-ready.NET 9 template implementing Vertical Slice Architecture with CQRS and REPR pattern.

    C# 1 1

  5. dotnet-oauth2-refresh-token-api dotnet-oauth2-refresh-token-api Public

    JWT + Refresh Token Rotation implementation using .NET 8. Secure PBKDF2 password hashing, IP-based rate limiting, clean architecture, and full test coverage.

    C# 1

  6. JwtAuthForBooks JwtAuthForBooks Public

    JWT Token Implementation for .NET 6 Web API

    C# 4 1