# Jeeyoung Kim [email protected] / [jeeyoungk.com](https://jeeyoungk.com) I'm currently the cofounder / CTO of [depthfirst.com](https://depthfirst.com/), revolutionizing security and vulnerability management. Engineering Leader with 10+ years of experience. I thrive in a small, scrappy, and nimble startup environment. Experienced in all areas of software engineering, but with a focus in scalable systems, developer productivity, and software architectures. Previously, I lead teams on software development lifecycle (SDLC), large-scale backend re-architecture, and data engineering. I've been fortunate to build and execute with high-performing teams, but also believe that being hands-on and not losing sight of the day to day is vital. # [depthfirst](https://depthfirst.com/) (2024-2025), CTO / Cofounder Security meets AI, AI meets Security. # ![[chronosphere.png|16]] [Chronosphere](https://chronosphere.io/) (2024) Cloud-Native Observability. I focused on optimizing the cloud infrastructure cost. # ![[plaid.png|16]] [Plaid](https://plaid.com) (2017-2023) Joined at 50 employees. I was lucky to shape Plaid's initial infrastructure and influence its culture. I'm especially proud of my initial contribution to Plaid's Go infrastructure, most extensively used to build and deploy services at Plaid. I was the engineering lead for the 2021-2022 university recruiting season. We closed 24 candidates with 40% of the closed candidates identifying in the URG. * (2020-2023) **Engineering Manager, Developer Efficiency** * 3 teams of 20 engineers responsible for the Software Development Lifecycle - CI/CD, Observability, Developer Environment, Common Libraries, Monorepos. Measuring and improving developer productivity and happiness. * Vendor management, build-vs-buy decisions, and AWS cost management. Led the AWS cost reduction initiative, reducing the Observability AWS spend by 50%. * [Developer Efficiency @ Plaid](https://plaid.com/blog/how-we-built-developer-efficiency-at-plaid/), [Scaling With Devenv](https://plaid.com/blog/scaling-with-devenv/) * (2017-2020) **Tech Lead, Core Services** * Responsible for the Core backend services powering Plaid's storage and traffic orchestration. * Bootstrapped Plaid's Go monorepo and shared libraries. * Introduced core technologies including gRPC, Prometheus, and tracing (via LightStep). * Started and iterated on multiple generations of core data storage layer on top of MongoDB, MySQL, and ElasticSearch, focusing on performance, reliability, and scalability. * (2017) **Data Engineering** * Bootstrapped Plaid's data and analytics platform. Set up the data warehouse and ETL pipelines, serving engineering, product, and business stakeholders. During my time I programmed in `Go`, `TypeScript`, and `Python`, Plaid's pillar languages. I was programming regularly (top 5 committer) until 2022 when I started to manage multiple sub-teams. # ![[square.png|16]] [Square](https://squareup.com) (2013-2017) Joined at 300 employees. Started in the Payments Infrastructure team but moved to Platform and Data engineering by the end. In summary, the work was repeated encounters with scalability and architectural challenges as Square predated AWS and modern scalability techniques. * (2016-2017) **Engineering Manager, Data Infrastructure** * Team of 8 engineers responsible for Square's data warehouse and ETL pipelines. * Data warehouse, data pipeline (event stream v2), Hadoop modernization (YARN). * (2015) **Tech Lead, Data Infrastructure** * Conducted PoC with (back-then) new technologies (Redshift and Airflow) and rolled them. * (2014) **Tech Lead, Observability** * Scaled Graphite backed (Whisper) with a custom Cassandra-powered time-series backend. * Author of the go-to per-service internal dashboard ("AppDash"). * (2013) **Tech Lead, Payments Infrastructure** * Scaled Square's infrastructure from a single instance Postgres to a horizontally sharded MySQL. * Conducted PoCs with various NoSQL databases (Riak, Cassandra) before ultimately rejecting them. * wrote [Why I love databases](https://medium.com/@jeeyoungk/why-i-love-databases-1d4cc433685f). I programmed in `Java` and `Python` in the context of microservices, data pipelines (MapReduce jobs), and ETL workflow. # ![[polychart.png|16]] [Polychart](https://github.com/Polychart) (2012) Co-founded a data visualization startup. Building "Tableau for the web" before its time with a modern take on the [Grammar of Graphics / ggplot2](https://en.wikipedia.org/wiki/Ggplot2). Looking back, I was naive and I didn't know what I was doing but it was a blast. # ![[waterloo.png|16]] University of Waterloo Bachelor of Mathematics - Joint Computer Science & Pure Mathematics (co-op) - with distinction, Dean's Honor List. ### Internships * ContextLogic (now known as [wish.com](https://wish.com)) (2011) * Google (2010) ### Other * **Work Authorization**:- Permanent Resident (US), Citizen (Canada) _Last Updated Jan 2024_