Danny Dominguez
Portrait of Danny Dominguez

Danny Dominguez

Software Engineer II at Invoice CloudMcAllen, TX

Open to new roles.

Payments, apps, and the APIs between them.

I build payment systems that move a million transactions a month, and native apps with 30,000+ downloads.

Highlights

Invoice Cloud

Software Engineer II2022 – Present

I build the payment APIs, ledger, and onboarding behind a multi-tenant payment platform, modernize legacy .NET services, and built its fraud and abuse detection.

1M+
transactions a month
3,000+
customer organizations
~50%
lower processing costs
+25%
throughput

Lotería Tradicional

iOS + Android30,000+ downloads

FreeTogether

iOS + AndroidGroup scheduling

Let's talk

Experience

Invoice Cloud

Payments engineer

Software Engineer II

– Present
  • Designed and delivered RESTful payment APIs, a ledger service, and onboarding for a payment-facilitator platform, cutting processing costs about 50% for customers.
  • Architected and built a fraud and abuse detection service spanning legacy and modern systems as the team's fraud subject-matter expert, reducing successful fraud to under 0.03%.
  • Integrated Datacap point-of-sale systems for card-present payments, including multi-invoice, multi-merchant payments.
  • Built a reusable AI skill with Claude and OpenAI Codex: an end-to-end pipeline that takes work items from refinement to the testing phase.
  • Led migration of legacy services to modern .NET on a multi-tenant platform processing more than 1 million transactions a month, raising throughput 25%.
  • Won 1st place in Invoice Cloud's company-wide Innovation Challenge, an internal engineering hackathon.
  • Won 3rd place at the Vista Hackathon, a 24-hour innovation competition across Vista Equity Partners' software portfolio.

Software Engineer I

–
  • Automated on-call diagnostics, saving more than two hours a day and cutting time-to-resolution for priority-one incidents 30%.
  • Improved Azure DevOps CI/CD pipelines, reducing failed deployments 45%.
  • Refactored legacy Visual Basic and C# applications for testability with NUnit, Moq, and Playwright.
  • Built onboarding and migration tools for a new file-based ACH payment integration.
  • Supported payment and batch systems serving 3,000+ customer organizations.

Drexel University

–

M.S., Software Engineering

Work

30,000+ downloads

Lotería Tradicional

Personal project2020 – Present

The app is the caller for Lotería, the traditional Mexican bingo game. I first built it in React Native, then rewrote it natively in SwiftUI and Kotlin, adding custom voice profiles you can record and share. Its website also calls the cards in the browser, and lets you play or print the game boards.

SwiftUI, Kotlin, Jetpack Compose, React Native, Cloudflare Workers

Lotería home screen with the El Gallo card and Jugar, Tabla, and Voces buttons

FreeTogether

Personal project2026

An iOS and Android app for small groups to mark their availability and rank the best dates for trips, reunions, and shared plans.

SwiftUI, Kotlin, Jetpack Compose, Firebase, Cloud Functions

FreeTogether group calendar showing each member's availability as colored dots

Roadmeter

Personal project2026

An iPhone mileage log that records drives in the background. Swipe each drive Business or Personal, see what it's worth at the IRS rate, and export a log for tax time. No account: drives stay on the phone.

SwiftUI, SwiftData, Core Location, Core Motion, MapKit

Roadmeter's To sort screen: October's claimed total and miles, then each drive with its route map, ready to swipe Business or Personal

dannydominguez.dev

Personal project2022 – Present

This site: a static Astro build. Every change must pass 250+ automated tests (unit, component, and browser tests in Chrome, Firefox, and Safari) plus accessibility, visual, and Lighthouse checks in a local CI gate before it merges, then AWS Amplify deploys it.

Astro, AWS Amplify, Route 53, Playwright

Home page of dannydominguez.dev with the Payments, apps, and the APIs between them headline

Skills

Backend & APIs
.NET 10, .NET 8, .NET Framework, ASP.NET Core, WCF, REST, SOAP
Payments
Datacap, Chase Orbital, J.P. Morgan, Cybersource (Wells Fargo), Bluefin, file-based ACH
Languages
C#, SQL, Python, JavaScript, Swift, Kotlin, PowerShell, Visual Basic
AI & automation
Claude, OpenAI Codex, end-to-end AI development pipelines
Cloud & delivery
Azure App Service, Functions, Service Bus, Key Vault, Azure DevOps, Kubernetes, Docker, CI/CD, Git
Databases
SQL Server, Oracle, MySQL, PostgreSQL
Testing & practices
NUnit, Moq, Playwright, Agile/Scrum, code reviews
Spoken languages
English, Spanish

About

Danny Dominguez at the Hoover Dam

I'm based in McAllen, Texas. Coding is my job and also a hobby: I like finding software fixes for everyday problems.

Outside of work I travel, stay active, and spend time with family, friends, and my dog, Todd.

Let's talk.

I'm open to new roles, and happy to hear about freelance projects.

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