Caleb O'Hara

Controls engineer building software that holds up in the real world.

I build practical tools for engineering workflows, then document what works. Most projects sit at the hardware-software boundary and optimize for reliability over hype.

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Focus

Controls + software integration

Current Role

Controls engineering at Siemens

Shipping

Internal tools, prototypes, and writing

Featured Work

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COMPASS Assessment

Behavioral assessment tool that maps natural tendencies across four orientations — Driver, Catalyst, Guardian, and Architect. Client-side only, no data collection.

Deployed as a live, no-login assessment with instant scoring
Kept all responses client-side for a privacy-first user experience

EV Reimbursement App

Internal tool for Siemens employees to track and submit home EV charging costs. Three-step wizard with tiered billing, additional charges, billing history, receipt generation, trend charts, guided tour, and dark mode. Installable as a PWA.

Replaced manual reimbursement tracking with a guided three-step wizard
Hardened security with CSP, SRI hashes, XSS-safe DOM APIs, and input sanitization