Christopher Doohan Email & Phone Number

Oakland, Ca, Us

Oakland, California, United States

- Inherited and managed a high-maintenance legacy codebase, as local engineer 0. On-shored knowledge and provided comprehensive training and mentorship to a team of five junior developers.- Containerized the app, unifying development and production environments, and easing developer onboarding difficulties.- Repaired a three-year-long broken database migration chain, allowing the production system to be reproduced locally for testing.- Set up CI via CircleCI and restored an abandoned testing suite, resulting in a test coverage jump from 0% to 30%.- Automated the previously manual trafficking of ads to Pinterest, freeing up 40 hours a week from the operations team.- Led efforts in fighting production fires, ensuring minimal downtime and quick resolution of frequent critical issues.

San Francisco, California, United States

- Fully built a scalable, privacy-centric customer outreach platform using Python, Terraform, and GCP, capable of fielding a million requests per second. This was greenfield work during startup incubation.- Built a proof of concept cross-platform C++ SDK for a major CAD organization, demonstrating the feasibility and scalability of real time customer interactions across a suite of native apps, resulting in a follow-up contract to further develop the feature set.- Wrote an in-depth architectural analysis of a client’s newly purchased Ruby on Rails app, resulting in a detailed roadmap for follow-up work to improve app security, and increase scalability by 30x.- Performed Ruby on Rails database integration work for a major eyewear retailer, enabling many new features.

San Francisco, California, United States

Oakland, California, United States

- Added custom ETL integration to import data from an enterprise backend into a Postgres/Rails data analytics app. This project also required technical investigations into data inconsistencies and schema difference between platforms, as well as automated data validation.- Optimized load times of Rails pages, resulting in 70% faster load time for primary landing page. Optimizations spanned SQL queries, template rendering, and data structures.

Oakland, California

- Implemented solutions in Python and C++ in order to scale a distributed system built on Django, Celery, Postgres, Pybind, and OpenCV. Spent 20% of the time on 24-hour support.- Optimized low level computer vision routines, resulting in 4x higher throughput for image processing.- Built instrumentation and scaffolding to drive TensorFlow and PyTorch machine learning models at a throughput of hundreds of inferences per second.- Increased overall observability by adding tooling to analyze system load, store Postgres time series statistics, and export data on network traffic.

Emeryville, Ca

- Wrote highly cross-platform, security-focussed C++ for a wide range of CPU architectures and platforms. Stack relied on Boost/OpenSSL/SQL Server.- Ported BigFix OS X Client from 32-bit to 64-bit, replacing the OS X Carbon API in the process.- Profiled and optimized I/O transcoding in the BigFix client, minimizing external library calls and unnecessary memory allocations, improving overall file read speed by 70%.- Developed virtual machine guest-side decision tree to identify underlying hypervisor as VMWare, HyperV, KVM, VIOS, or VirtualBox, giving systems administrators more fine grained visibility and control over their deployments.- Improved BigFix code stability by contributing error diagnostics and test coverage tools to the build system, and personally removing 60% of compiler warnings during down time.

Emeryville, Ca

- Developed testing frameworks and tests for APIs and front end web services, using Python, Perl, and JavaScript. Selenium and Protractor were also leveraged. - Black and glass box testing on distributed systems across a diverse collection of platforms, including Windows, Linux, Solaris and AIX.

Seattle, Wa

- Assisted in experimental setup and data acquisition for x-ray measurements at SLAC and ANL. - Developed data analysis tools, including automated curve fitting and plot generation routines, for x-ray emission and diffraction data using Mathematica and Python's numpy and matplotlib libraries. - Wrote software to simulate diffraction patterns for a given ionization and charge density.

Seattle, Wa

- Taught approximately 100 students in small-group discussion sections focussing on physical concepts. - Taught approximately 160 students in lab classes focusing on circuitry and electrodynamics. - Taught students one-on-one in physics and calculus.

Santa Cruz, Ca

- Used wetlab techniques, such as sputtering and spin-coating, to fabricate a variety of semiconductor devices, including transistors and solar cells. - Developed and tested circuitry for solar cell characterization. - Developed software, primarily in WaveMetrics and LabVIEW, to interface with lock-in amplifiers, current/voltage source-meters, cryostats, and other hardware, automating frequently used measurement procedures. - Developed data analysis software in WaveMetrics and Python to determine semiconductor device characteristics. - Measurement techniques often involved analyzing time-dependent quantities in real-time and using these quantities as triggers for other measurement routines.

Master Of Science (Ms), Physics

Bachelor Of Science (Bs), Physics