Hey! I’m Zac. I’m most interested in low-level systems work: performance, reliability, and understanding how things behave in production.
At Instacart, I’m the primary developer of our C++ Redis/Valkey proxy and help run our caching platform on AWS. I’ve also supported our Postgres/Aurora storage infrastructure. Before that, I was at Citadel in Global Fixed Income & Macro, where I owned the job execution platform for trading tools on GCP and Kubernetes. I graduated from the University of Waterloo in 2023 with a Bachelor of Software Engineering.
In my spare time, I enjoy reverse engineering old-school PC games, fitness, collecting guitars and basses, Hi-Fi audio, and playing video games.
Experience
- Instacart, Software Engineer II, Caching & Storage Infrastructure (May 2025 – Present)
- Citadel, Software Engineer, Global Fixed Income & Macro (Aug 2023 – Nov 2024; intern Sep – Dec 2022)
- Meta, Software Engineer Intern (Jan 2022 – Apr 2022)
- Salesforce, Software Engineer Intern (May 2021 – Aug 2021)
- FreeBSD Foundation, Software Engineer Intern (Sep 2020 – Dec 2020)
- TextNow, Backend Engineer Intern (Jan 2020 – Apr 2020)
- Emailtopia, Full Stack Engineer Intern (Jan 2019 – Aug 2019)
- Segmentech, Software Engineer Intern (May 2018 – Aug 2018)
Contact
Email me at zacharyjoffe@gmail.com, or find me on LinkedIn and GitHub.