* Created elf loading subsystem for extending firmware at runtime (llext)* Created io_uring like asynchronous I/O subsystem, used for updated sensor driver and subsystem APIs (rtio)* Maintainer of dma, i2c, rtio, and llext areas of Zephyr* Authored various board packages, drivers, and docs.

Adding value to transit apps by creating new and interesting ways to connect commuters to their local businesses.Lead development of high performance low latency contextual ad server and real time analytics pipeline in Rust. Developed native Android and iOS SDKs to embed native advertisements. Automated operations and deployment with Salt, Linode, and AWS.Helped to grow revenue 300% over several years by improving product quality and scaling to new markets.A LeanUp endeavor.

LeanUp is basically the core team of folks I like to build stuff with. Half think-tank, half R&D. We selectively take on projects both internal and external and spin out prototypes, products, and often businesses.We take product ideas from napkin sketches to pitches and further.Primary role doing electronics design, board layout, firmware, and testing. Bluetooth and USB connected devices for collecting sensor data and doing embedded controls. Embedded applications using Zephyr RTOS and C. Soft real-time control using Linux, C, and Erlang. Data analysis and data management work using Python, Rust, and C.

Providing technologies for the automation and improved performance of liquid-liquid chromatography instrumentation.Board design, embedded firmware, custom sensor development, and soft real-time control system using Embedded Linux.A LeanUp project

Architected and lead the development of a social graph in PostgreSQL with temporal, relational, and geographical search and meaning.Developed a high speed messaging system for sending user notifications to multiple destinations.Architected and developed a multi-provider, secure, single sign on system.Lead the development of a REST API written in Go of all of the above.

Counter-Current Chromatography Automation and Sensor DevelopmentScientifically researched and developed in collaboration a novel sensor to measure solvent gradient flows.Designed, Developed, and Tested a custom controller and analog circuitry for reading hand built custom sensorsDesigned, Developed, and Tested a custom controller for doing digital and power control over centrifuges, valves, and sensors.Designed, Developed, and Tested a soft real time embedded control system using Linux, Erlang, Python, and JavaScript. Provided a highly interactive user interface in a web browser with a visual graph programming tool, real time visualization of high performance sensors, logging.A custom data analytics pipeline using Python, NumPy and SciPy to filter and analyze sensor signals.Directly delivered product to customers, assisted in training and answering questions.

Tool and Monitoring Software Development• Developed a flash like tool for designing and generating games for custom embedded Linux platform.• Diagnosed and debugged memory leaks and performance problems using Valgrind and Strace• Created a custom libmng decoder in C to avoid memory fragmentation• Created a custom mmap based animation library in C++ for handling large animations consisting of 100 to 1000s of high resolution lossless images using very little physical memory and still being very efficient at playback, forward, and backward frame scrolling.• Developed a custom slot floor monitoring program using Python, Pyramid and SQLAlchemy for visualizing real time activity on a large number of slot machines.

Telecom Switch Testing and Quality Insurance• Created a C program to directly interact with a GPIB HP telecom test machine using TCP/IP on a Sun Ultrasparc.• Ensured an enormous test suite for Tellabs Titan 5500 could use the newer HP test machine in place of an older HP test machine using GPIB over SCSI.• Ported all programs from Solaris to RHEL for future usage with modern machines