I was the interim Head of Engineering at Agoric. I helped the team launch (in October 2022) their mainnet-1 composable smart contract framework built with Hardened JavaScript, and the Inter Protocol built using that framework.

Head of Reliability Platform (including Observability) at Uber: metrics, tracing, logging, alerting and dashboarding, external product monitoring, on-call experience, production scalability testing, service end-point testing, service metadata, etc. I led this 70-person software development organization, with teams in New York, San Francisco, Palo Alto, and Lithuania. We work closely with SRE / Production Engineering to improve the reliability and scalability of Uber's systems and products.

As a senior leader of the 300-person Reference Data program, I led the team that built the core software of the new Reference Data Platform (Cesium) for Global Markets. Co-author of Cesium’s software and hardware architecture. Managed a team of twenty-three developers in New York, Chicago, and London. This new platform uses Resource Description Framework (RDF) and takes a rigorous model-driven approach: adding new data attributes, entity types, and “extension” data provided by other teams requires no code changes or database schema changes to the core platform - it’s all driven from the RDF model. Cesium provides full bi-temporality, fine grained access control, real-time notification, batch feeds out, and federated model and data authoring. Technology: RDF, Scala, Java, Python, Prolog, IBM DB2.As a member of the Quartz Core team, I designed and implemented the Quartz Access Control (Quack) system which provides access control for this critical multi-hundred-million dollar platform. I wrote the entitlement engine in C++ so it could be embedded in the Sandra distributed object store; it can perform 1 million entitlement checks per second per CPU core. I also wrote the Python binding and tools. Technology: C++, Python, Prolog (for prototyping).

As a member of the Sales Technology Core team, I was the co-designer and sole implementer of the Visibility Service, the authoritative service to determine whether a user can see a trade, position, contact, revenue item, etc. across all applications in Global Sales. Visibility Service is capable of providing visibility decisions for a basket of 300,000 trades in one second. Co-designer and lead programmer for the ACCORD system, which provides account, client, and relationship data for all applications in Global Sales. Helped develop the Raven “model-driven-architecture” code-generation tool, being used to rapidly build many services in Sales. Built the tool that monitors all Core Services at the application layer. Provided tools and data analysis for the project to revamp the Global Sales coverage model. Team expert on JVM tuning. Technology: Java, Perl, Python, C, DB2, Linux. As a member of the Firmwide Internet Group, I designed and implemented the high-performance, high-reliability Content Selection Cache, including client-side API and synchronization server, for Investment Research data on the new Institutional Portal (now “Goldman 360”). Designed and implemented the rules-based entitlement engine for all persistent content on the Institutional Portal. Built the tool that is used to monitor, start, and stop all of the Portal’s components on dozens of machines in several administrative zones. Designed and implemented a system to exchange research with TheMarkets.com. Developed an iPlanet Enterprise Web Server NSAPI plug-in to support a next-generation entitlements engine. Took over responsibility for the proprietary authentication, entitlement, and preferences database that is used by many of the firm’s Internet systems, and many of its intranet systems. Technology: Java, Perl, C++, Sybase, Solaris.