About Us

Quoc Nguyen

How We Got Here

Our founder Quoc Nguyen wrote his first C# program back in 2010 — and honestly, the code was pretty bad. But he kept at it. 16 years later, we've worked on healthcare systems, enterprise logistics software, and even arcade games. What started as one developer asking too many questions became a studio that designs and ships systems other teams now depend on.

What We Actually Do

Most of our work is in C# and .NET — desktop apps with WPF, web APIs with ASP.NET Core, mobile apps with MAUI. We've spent a lot of time figuring out how to make different systems talk to each other, which means microservices, message queues, and debugging why things work locally but not in production.

Beyond the Code

Our founder got his Scrum Master certification because he wanted to understand why sprints kept going sideways. Recently we've been deep in AI/ML — that's where the industry is heading. When we're not shipping, we're probably reading about new tech or helping junior devs figure out why their API is returning 500 errors.

System Architecture

Designed microservices for 60+ distributed nodes with 99.97% uptime. I think about how pieces fit before writing code.

Technical Leadership

Led teams of 5-10 engineers across enterprise projects. Teaching what I know, learning what I don't.

Cloud Architecture

Azure and AWS in production — I've made mistakes on both so I know what not to do. Multi-cloud deployments across 3 platforms.

Performance & Scale

Optimized APIs from 4s to 200ms response time. Because nobody likes waiting for their app to load.

How We Can Work Together

Whether you need a full team or just an extra pair of hands — I've got you covered.

Dedicated capacity

Full-Time Team

Your project, my people. We plug into your workflow like we've always been there.

Low commitment

Part-Time Help

10-20 hrs/week. Good for maintenance, new features, or just having someone to bounce ideas off.

MVP-ready

Startups & Side Projects

Got an idea but no tech cofounder? I've helped solo founders go from napkin sketch to launched product.

Strategic guidance

Fractional CTO

Architecture decisions, hiring help, tech roadmap — without the full-time salary.

Win-Win Partnership

Here's how I think about working together:

I only win when you do

Not interested in billing hours for code nobody uses. If your metrics don't move, I haven't done my job.

Transparent pricing

I'll tell you what it costs, how long it takes, and if something goes sideways. No hidden fees.

You keep everything

Full source code, docs, and training. We don't hold your project hostage — your team should be able to run it without us.

Where I've Worked

Companies and projects that kept me busy (and taught me a lot)

Enterprise Client (NDA)

Technical Lead & Solution ArchitectMay 2015 – PresentRemote (Vietnam)

Enterprise Logistics Ecosystem

Lead Architect & Developer
  • Led the team that built an enterprise resource system for a multi-region network
  • Designed the microservices layer — gRPC, Hub Service pattern, the works
  • Data sync across stores was the hard part. Built a framework that actually handles it.
C# .NETMicroservicesgRPCSQL Server

Fleet Mobile Solutions

Technical Lead
  • Cross-platform mobile apps for inventory and sales — from zero to production
  • MAUI + Xamarin hybrid setup (yes, both — migration story)
  • Wired it up to the ERP backend via RESTful APIs
MAUIXamarinWebAPIAzure DevOps

Cloud Integration Platform

Solution Architect
  • Cloud integration platform connecting multiple operating nodes
  • Event-driven architecture with Azure Service Bus and Functions
  • Real-time analytics dashboard — actual business decisions came from this
AzureEvent-DrivenDockerCI/CD

DNAfor.NET

Senior Software DeveloperMay 2011 – Jul 2015Ho Chi Minh City, Vietnam

ChartLogic Healthcare EMR

Senior Developer
  • Full EMR system with HL7 integrations — healthcare is a different beast
  • WPF desktop app using proper MVVM (not the fake kind)
  • Service layer over WCF for third-party connections
WPFMVVMWCFSQL Server

GoComics Mobile Application

Lead Mobile Developer
  • Cross-platform comic reader app — fun project, tight deadline
  • Ionic + Cordova hybrid (before React Native was cool)
  • Content management with MongoDB on the backend
IonicCordovaMongoDBJavaScript

Independent Consulting

Expert Software DeveloperJan 2011 – PresentRemote

DN Game Studio Projects

Technical Lead & Project Manager
  • Ran the dev team across multiple Unity game projects
  • Cloud infra on Azure + AWS — picked the right tool for each job
  • Handled everything from scoping to delivery to client calls
UnityAzureAWS.NET

LSB Organization (Amazon Seller Tools)

Lead Developer & Project Manager
  • Automation tools that save Amazon sellers hours every day
  • Designed the architecture and wrote the backend
  • SP-API integration — Amazon's API is... an experience
.NETBlazorAWSAmazon API

Certifications

Verified credentials from industry leaders — because experience is best paired with formal recognition.

AI Fluency: Framework & FoundationsVerified

Anthropic

Issued: January 2026

Claude Code in ActionVerified

Anthropic

Issued: January 2026

Scrum Master CertificationVerified

LearnQuest

Issued: October 2025

Google Tech LeadVerified

Google

Issued: August 2025

Continuing Education

Software Architecture & System DesignUdemy (2024)AI & Machine Learning BootcampUdemy (2024)Agile Fundamentals: Scrum & KanbanUdemy (2025)

Education

BSc in IT Software Engineering

Hoa Sen University, Ho Chi Minh City

2007 - 2011

What I Work With

Tools I've used over 16 years — some I love, some I've just learned to live with

Languages & Platforms

C#.NET CoreMAUIJavaScriptTypeScriptPythonNode.jsSQL

Web & APIs

ASP.NET CoreBlazorWebAPIgRPCReactAngularREST

Architecture & Patterns

MicroservicesEvent-DrivenClean ArchitectureDDDCQRSMVVM

Cloud & DevOps

AzureAWSDockerKubernetesGitHub ActionsCI/CD

Databases

SQL ServerPostgreSQLMongoDBRedisFirebase

Methodologies & Tools

PMPAgileScrumTDDAutomated TestingJIRA

Let's Talk

Have a project idea or just want to chat about tech? Drop me a message.

Let's Work Together

Have a project in mind? Send me a message.

< 24h reply

Contact Information

Pick whichever works for you.

Email

hello@appxdev.cloud

Available 24/7

Phone

(+84) 79 200 10 73

Mon - Fri, 9AM - 6PM (GMT+7)

Location

Ho Chi Minh City, Vietnam

Open to remote work worldwide

Connect With Me

Available for new projects

Currently accepting freelance work and consulting opportunities.

Frequently Asked Questions

How much does a project cost?

Startup MVPs typically run $8K–$20K. Enterprise systems start at $25K. Fractional CTO retainers from $2K/month. I always send a detailed quote before starting — no surprises.

Do you work with international clients?

Yes — most of my clients are US-based. I've been working remotely across timezones for 10+ years.

Can you sign an NDA?

Absolutely. I've worked under NDAs with enterprise clients. Happy to sign yours before we discuss details.

What tech stack do you specialize in?

.NET / C# for enterprise, React / Next.js for web, and I've shipped production systems on Azure, AWS, and GCP.