Aug 2021 – Jul 2023 · 1 yr 11 mos · Greater London, England, United Kingdom · Remote

• Led a project to reduce hosting costs by 20% by adding virtual hosting to Synapse, a backend implementation for the Matrix distributed messaging protocol written in Python.
• Co-led a multi-month project to reduce join time for large distributed chat rooms by 90%.
• Diagnosed and resolved issues on the matrix.org node, with 2.1 million monthly active users.
• Added support for Matrix spaces to the platform for the FOSDEM 2022 conference and collaborated with devops and frontend teams to ensure the conference ran smoothly.

Mar 2019 – Aug 2021 · 2 yrs 5 mos · Cambridge, England, United Kingdom · Remote

• Led a project to reduce the scheduling time of warehouse orders by 50%. Profiled Python code, analyzed PostgreSQL query plans and proposed refactors to improve performance.
• Built and supported a dashboard for warehouse operations, using Apache Kafka and ksqlDB.
• Built new frontend flows for warehouse operators, using TypeScript, React and GraphQL.

May 2018 – Mar 2019 · 10 mos · Cambridge, England, United Kingdom · On-site

• Maintained a low latency replacement for the Linux networking stack, written in C. Used by many high-profile trading firms and allowed nginx to scale to 500,000 requests per second.
• Debugged complex low-level bugs, including kernel deadlocks, races and packet corruption.
• Improved the security of the networking stack by identifying issues through fuzz testing.
• Improved productivity by optimizing running times of tests by 40% and increasing coverage.

Sep 2015 – May 2017 · 1 yr 8 mos · Shelford, England, United Kingdom · On-site

• • Built the startup’s calling and messaging app for iOS, using Swift and Objective C.