Storage and ingestion on the Mimir metrics database.

Tech Lead and Directly Responsible Individual for Sequins: Stripe's foundational distributed key-value store for slowly changing data. Sequins is relied upon internally by O(100) teams and serves millions of reads per second over a multi-petabyte corpus at extremely low latency and high availability.Saved >$6M annually in optimization of serving systems that allowed us to run on newer, smaller, cheaper cloud instance types without disruption to our stringent SLAs.Redesigned and re-implemented load balancing algorithm to reduce CPU load by >50% on back-end storage nodes.Onboarded ~20 engineers to formally support service when no formal support existed.Designed rate-limiting controls to shield service from saturation by misbehaving clients.Chief investigator of low-level problems in Go, Linux kernel and TCP stacks. Decreased CPU load on serving systems by 30%+ by going deep with Go's tracing and profiling tools and aggressively removing goroutine and memory allocations. Solved multiple EC2 network limit issues diagnosed with eBPF and TCP analysis tools.Shepherded numerous concurrent critical projects led by other engineers: Kubernetes migrations, caching systems, instance type migrations.Primary liaison for critical Stripe initiatives as they related to Sequins: high availability/disaster recovery, holiday season readiness, cost reduction, ...

Working on reliability, correctness and performance of Mixpanel's storage tier, written in Go, Kafka, Kubernetes on GCP. Owner of Mixpanel's GDPR infrastructure components and Mixpanel's open source Python library.

Part-time software engineering role contributing to Cozy: an automatic data structure synthesis tool written in Python. I wrote a common subexpression elimination (CSE) pass for Cozy's back-end code generation layer. I've added new features to Cozy's built-in specification language, and I've improved Cozy's quality by tracking down and fixing bugs.

I designed and wrote a ton of custom software for Art & Logic's clients. A&L's projects often had difficult requirements, challenging deadlines and precise budgetary needs. These projects had me working all over the tech stack in dozens of languages and frameworks. I wrote native Windows/OS X/iOS apps, full-stack web applications and more.Leading projects was among my primary responsibilities. I worked with A&L's clients to see projects from early requirements to delivery. I frequently managed the work of a team of engineers (including myself), designers and testers.I created over 100 comprehensive estimates for incoming projects. This part of my position cemented my understanding of the things that go into software projects and the effort needed to implement them.I wrote over 250 detailed reviews of Art & Logic Programming Challenge submissions from prospective A&L recruits. A&L's Chief Engineer called my reviews "spot on."

Developed widely-used Web applications and back-end software.Implemented a check digit algorithm to generate barcode numbers for all Borders Rewards, American Eagle Outfitters and Ann Taylor rewards program membership cards.Optimized performance of frequently-used pages in high-traffic MySony application by 70+ percent.

In the server team on Verizon's "iobi" product, I worked on the user presence API. I designed a diagnostic logging toolkit and log aggregation system used throughout the server platform.

Created C++ data upgrade tools to transform patient data between software versions at deployed hospital sites.

At Gothica I wrote an accurate reporting interface for a high-traffic commerce system with a highly complex SQL Server schema. I created custom web applications for Gothica's clients, including Dr. Phil's e-commerce site.

I was the primary developer on a lot of full stack custom web applications for InSite's clients using ColdFusion, ASP, JavaScript and SQL Server. I created InSite's internally-vital project management intranet application. I did early work with new technologies like AJAX and Flash/server communications before they were popular. I created Pizza Hut's first online coupon clipping system.

I created internal web applications in ColdFusion and SQL and built database interface tools used by ParaCom's accounting department.