AJ

Alex Johnson

Senior Backend Developer | C# | .NET

Building robust APIs and scalable systems with clean architecture

About Me

With over 10 years of experience in backend development, I specialize in creating high-performance, scalable systems using C# and .NET technologies. My passion lies in writing clean, maintainable code and implementing robust architecture patterns like Domain-Driven Design (DDD) and CQRS.

Throughout my career, I've led teams in delivering complex enterprise solutions, optimized database performance, and architected microservices that handle millions of requests daily. I believe in continuous learning and staying current with the latest technologies and best practices in software development.

When I'm not coding, I enjoy contributing to open-source projects, mentoring junior developers, and exploring new technologies that can improve development efficiency and system reliability.

Technical Stack

Primary Technologies

C#
.NET 6/7/8
ASP.NET Core
Entity Framework
SQL Server
REST APIs
gRPC
SignalR

Architecture & Cloud

Docker
Kubernetes
RabbitMQ
Redis
Azure
AWS
Microservices
CQRS
Domain-Driven Design
Clean Architecture

Tools & DevOps

Visual Studio
VS Code
Git
Postman
ReSharper
Azure DevOps
GitHub Actions
SonarQube
JetBrains Rider

Work Experience

Senior Backend Developer

2020 - Present
TechCorp Solutions

Lead backend development for enterprise-scale applications serving 2M+ users

Key Achievements:

  • Reduced API response time by 60% through query optimization and caching strategies
  • Architected microservices system handling 10M+ daily requests
  • Mentored team of 6 junior developers and established coding standards
  • Implemented CI/CD pipelines reducing deployment time by 80%

Technologies:

C#
.NET 6
Azure
SQL Server
Docker
Kubernetes

Backend Developer

2017 - 2020
Digital Innovations Inc

Developed and maintained REST APIs for fintech applications

Key Achievements:

  • Built secure payment processing system handling $50M+ annually
  • Improved database performance by 40% through indexing and query optimization
  • Implemented real-time fraud detection system using SignalR
  • Led migration from monolith to microservices architecture

Technologies:

.NET Core
Entity Framework
RabbitMQ
Redis
PostgreSQL

Full Stack Developer

2014 - 2017
StartupLab

Full-stack development for various client projects and internal tools

Key Achievements:

  • Developed MVPs for 15+ startup clients using agile methodologies
  • Created automated testing framework reducing QA time by 50%
  • Implemented OAuth 2.0 authentication system used across 10+ applications
  • Optimized legacy codebase improving performance by 300%

Technologies:

C#
ASP.NET MVC
SQL Server
jQuery
Bootstrap

Featured Projects

E-Commerce Microservices Platform
Featured

A scalable microservices-based e-commerce platform built with .NET 6, featuring order management, inventory tracking, and payment processing.

Technical Challenges:

Implemented distributed transactions using Saga pattern, designed event-driven architecture with RabbitMQ, and achieved 99.9% uptime.

Tech Stack:

.NET 6
Docker
RabbitMQ
Redis
PostgreSQL
Azure

Real-time Analytics API
Featured

High-performance API for real-time data analytics with support for complex queries and data aggregation.

Technical Challenges:

Optimized query performance for large datasets (100M+ records), implemented caching strategies, and built real-time dashboards using SignalR.

Tech Stack:

ASP.NET Core
SignalR
SQL Server
Entity Framework
Azure

DevOps Automation Toolkit

Open-source collection of tools and scripts for automating deployment and monitoring of .NET applications.

Technical Challenges:

Created reusable deployment templates, integrated with multiple CI/CD platforms, and built monitoring dashboards.

Tech Stack:

PowerShell
Docker
Kubernetes
GitHub Actions
Prometheus