Huy Tran.

Problem

RFID keycards are cheap, ubiquitous, and trivially cloneable. We wanted hands-free entry with cryptographic identity, on a budget a senior design team could actually afford.

Approach

Ultra-Wideband distance measurement on custom PCBs — ESP32 paired with Qorvo DWM3000 modules, AES-128 over the channel, firmware in C++. I worked across hardware and firmware: schematic design in KiCad, assembly, and the integration testing that no one wants to do.

Outcome

A working tag-and-anchor system. Two custom boards from schematic to silkscreen.

What I do here

I ship React features and build the ASP.NET Core (.NET 8) endpoints behind them — SQL Server stored procedures with CTEs, table-valued parameters, and JSON aggregation, plus API rate limiting. Some business logic doesn’t belong in T-SQL at all, so I’ve moved it into SQL CLR assemblies instead — keeping it fast, testable, and easy to refactor as the schema evolves.

Keeping the lights on

When the testing servers misbehave, I debug them. Hardened asset access via short-lived Azure Blob SAS tokens so partner files aren’t indefinitely public. Built an internal WinForms tool with Entity Framework and DevExpress that cut a manual data workflow by 42%.

Outcome

Earlier feature work cut average client–contractor hiring time by 20%.

Problem

I was tired of inbox-flooding tech newsletters. I wanted to read what I wanted, when I wanted, on my phone, without an account.

Approach

Genre-based filtering, offline reading via SQLite, curated onboarding so a new user has something to read in five seconds. Backend aggregates from NewsAPI with deduplication.