First engineering hire after Xaptum’s $2.2mm seed raise in 2016, starting as a principal engineer and eventually becoming CTO. In addition to cultivating the engineering team, I spearheaded a major pivot as we sought product-market fit, culminating in our zero-trust overlay network architecture for IoT. Wore many engineering hats over six years (pre/sales, software, network, firmware, hardware, security) and managed a diverse set of employees, contractors, partners, and customers. Helped secure first paying customers and partner supplier contracts.Xaptum is a secure IPv6 overlay network designed for numerous, mobile, dispersed IoT and edge devices. Early markets include railroad, digital signage, and environmental sensing. The backbone network hosts a variety of network & security services, making Xaptum the first SASE (secure access service edge) for IoT.Some engineering design highlights include:• An extensible core network backplane using segment routing (SRv6) and eBPF.• Zero-touch identity & credential provisioning for high-volume devices in an untrusted supply chain, using TPM2.0 secure elements, DAA (direct anonymous attestation) group signature algorithm, and a custom authentication protocol (XTT).• A plug-n-play network card to connect an IoT gateway to the Xaptum overlay, essentially a mini-PCIe form-factor, single-board Linux computer incorporating a WiFi chipset and the Xaptum "enftun" tunnel client.

A multi-player card game for the Google Chromecast, including both Android and iOS sender applications (>250,000 installs) and a website for custom deck creation (>50,000 MAU).• Wrote Android "sender" application for players to interact with the Chromecast game.• Maintained all backend AWS infrastructure and optimized database & query design.

A virtual assistant for improving personal finance by automating best practices. Users create tasks instructing Tellur how to watch and respond to account activity: warn me when I overspend my monthly “restaurant” budget or remind me to move part of my paycheck into my IRA.Some engineering design highlights include:• Designed the type system and language underlying the Tellur custom task builder. • Designed and implemented the backend verifier (typechecker) and execution engine for the tasks.• Developed a free monad-based Scala library for typesafe, usage use of the Intuit Transactions API .• Developed a Python library for concise, composable, and programmatic declaration of AWS Cloudformation templates.