Open to Principal/Senior Engineering roles at growth-stage companies

David Michael Flahive

Principal Engineer & Software Architect

Principal Engineer with over 20 years of experience architecting and scaling enterprise platforms. Independently founded and operates platforms serving millions of users with $30M+ in transactions processed.

SignUpGenius RegistrationMax LLC Texas A&M University

Beyond the Resume: Real Code Evidence

This portfolio includes access to real production repositories, comprehensive infrastructure documentation, and 18+ years of platform operation history with verifiable business impact.

Code Repositories

Multiple production codebases with Clean Architecture, Domain-Driven Design patterns

Infrastructure

Enterprise datacenter to AWS migration with comprehensive documentation

Production Scale

$30M+ transactions, millions of users, continuous multi-year operation

About Me

I'm a Principal Engineer and software architect with over 20 years of experience independently building and scaling enterprise platforms. Having founded RegistrationMax LLC, I architect mission-critical systems serving millions of users across government, nonprofit, and commercial sectors.

As Founder of RegistrationMax LLC since 2006, I've architected fully redundant AWS infrastructures, designed complex multi-tenant SaaS platforms, and built bulk-email systems capable of 2M+ monthly sends. My work is backed by extensive documented codebases and real production systems with verifiable scale.

I combine entrepreneurial accountability with deep technical execution, delivering complex projects on aggressive timelines while maintaining long-term platform stewardship across multiple high-scale production systems. The AI context system provides detailed insights into actual implementations and architectural decisions.

Key Highlights

20+ years of software development experience
Scaled systems to handle millions of users
Expert in .NET, C#, Angular, and AWS
DevOps and infrastructure expertise
Extensive documented codebase portfolio
Bilingual (English/Spanish)

Experience

Each role includes queryable AI context—the real story behind the bullet points.

Founder & Principal Engineer

RegistrationMax LLC/LumaVerse

Charlotte, NC • November 2006 - Present

Current

Frequently Used Technologies

.NET, C#, VB.NET, T-SQL, Angular
Git, Nginx, IIS, Windows Server, Linux
MS SQL Server, MS SQL Availability Groups
AWS: EC2, ECS, ELB, WAF, EFS, S3, ElasticCache

Key Accomplishments

  • • Founded and operates multi-platform SaaS business since 2006
  • • 4HOnline.com: 5M+ memberships, $22M+ transactions (18+ years operation)
  • • FairEntry.com: 13,000+ fairs, 13M+ entries, $8M+ transactions
  • • Rebuilt Tickets.SignUpGenius.com in under 4 months
  • • Architected fully redundant AWS infrastructure across multiple AZs
  • • Built bulk-email infrastructure: 2M+ monthly sends with high deliverability

Previous Experience

Programmer

Texas A&M AgriLife Extension

College Station, TX • August 2009 - December 2012

Provided technical expertise and deployed new technologies including ASP.NET, C#, SQL Server, and GIS platforms.

Web Developer

ParishSOFT LLC

Ann Arbor, MI • January 2008 - July 2009, December 2009

Designed web-based data management systems and hierarchical permission structures for masstimes.org.

Programmer

Texas A&M AgriLife Extension

College Station, TX • February 2001 - December 2007

Coordinated database modernization projects and migrated legacy systems to modern LAMP-based solutions.

Featured Projects

Real production systems with documented codebases—not demos or prototypes.

4HOnline.com

Nationwide 4-H membership enrollment and event registration platform

• 5M+ memberships processed across the United States
• $22M+ in online transactions facilitated
• .NET Core + Angular with MS SQL Server
• 18+ years of continuous operation since 2006

Tickets.SignUpGenius.com

Event ticketing platform built for SignUpGenius's 300M+ user base

• Fully rebuilt from scratch in under 4 months
• Production-ready .NET stack migration
• Designed for high-volume concurrent ticket sales
• Aggressive timeline delivery for critical business need

FairEntry.com

Comprehensive county and state fair management and entry system

• 13,000+ fairs managed nationwide
• 13M+ individual entries processed
• $8M+ in online transactions
• Complex multi-tier entry workflows with payment integration

LearnGrow.io

Online training management system for YQCA (Youth Quality Care of Animals)

• .NET MVC architecture with course management
• Serves youth and educators in agricultural training
• Comprehensive training tracking and certification
• Youth animal care education platform

OnlineStable.com

Animal records management system for AQHA (American Quarter Horse Association)

• .NET MVC platform for comprehensive breed records
• Handles complex multi-party data relationships at scale
• Official quarter horse association partnership
• Complete pedigree and registration management

AWS Infrastructure

Full infrastructure migration to cloud

• Multi-availability zone deployment
• Fully redundant architecture spanning multiple regions
• Zero-downtime database operations with SQL Server Availability Groups
• Complete infrastructure as code with disaster recovery

Skills Matrix

Honest self-assessment—including what I'm NOT good at.

STRONG ✓

MODERATE ○

GAPS ✗

AI Development Tools

Cursor
Claude Code
Amazon Q
Great for mockups & debugging,
but I prefer to refactor/rewrite
for production quality

Languages & Frameworks

.NET / .NET Core
C# / VB.NET
Angular/AngularJS
T-SQL
PL/pgSQL
JavaScript

Cloud & DevOps

AWS (EC2, ECS, S3, etc.)
Cloudflare
Nginx / IIS
Windows Server
Linux Ubuntu/Debian/RHEL/Rocky
VMWare ESXi
Proxmox
Hyper-V

Databases

Microsoft SQL Server
- Enterprise/Standard
- Availability Groups
PostgreSQL
- Percona
- Patroni
MySQL (it's been a while)

Third-Party Services

Stripe
Twilio
SendGrid
DevExpress
SmartyStreets
Devart LinqConnect

Get In Touch

Contact Information

Location

Dripping Springs, TX 78620

Languages

English (Native), Spanish (Fluent)

Education

Texas A&M University

College Station, TX

1998-2003 • 118 credit hours earned

Mechanical Engineering Technology / Computer Science

Professional References

Professional and personal references are available upon request.