Shaun Patrick Alonzo

I’m a senior .NET engineer and technical leader with 10+ years building and leading distributed systems. I authored RFCs, led design reviews, and conducted technical interviews to help teams ship with confidence.

At Domain (domain.com.au), I’ve modernized mission-critical .NET services by migrating from .NET Framework 4.6 to .NET 8 and eliminating 5+ years of technical debt. I architected multi-tenant Pricing & Billing using Event Sourcing and AWS EventBridge, SQS, and SNS, then drove adoption of the event-driven design. I also lead incident response and post-mortems, improving observability and validating bottlenecks with deadlock simulations.

Previously at Carsales (carsales.com.au), I decomposed a monolith into a read-path service and a separate write-path, delivered the Redbook.com.au modernization, and built end-to-end features across C#, Angular, React, Next.js, and AWS. Earlier roles include SOC2-compliant API architecture at Moneyme and leading a cross-functional squad at Nowcom Global Services—where I reduced lender response times from 8s to 2s.

I bring AI into the SDLC by integrating LLM-based code audits and RAG-driven documentation, maintaining 80%+ unit test coverage and increasing engineering velocity by 40% using GitHub Copilot and Gemini. I’m also AWS Certified (Solutions Architect – Associate), and I enjoy building practical systems through projects like Cards Guide PH and my AI-assisted currency converter demo.