James Greenhill
Chief Data Wrangler
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolJames Greenhill is a seasoned data and infrastructure leader with 14 years of experience building resilient analytics and real-time pipelines for companies from startups to Uber and PostHog. As Chief Data Wrangler at PostHog he combines backend, DevOps and SRE expertise—shipping features like optimized funnel rendering, ClickHouse integrations, and ECS/CloudFormation deployments while cleaning up type systems and infra. He led data engineering for Uber’s New Mobility and Self-Driving teams, architecting two generations of pipelines that synchronized requirements across seven+ stakeholder orgs and moved teams from firefighting to proactive SLAs and monitoring. Based in San Francisco, he also scouts and invests in data, infra, and developer-experience startups through Accel, pairing operational chops with early-stage product insight. Known for diplomatic problem-solving amid chaos, he blends hands-on coding, infrastructure automation, and strategic decision-making with a knack for pragmatic, cross-functional collaboration.
14 years of coding experience
17 years of employment as a software developer
Industrial Systems Engineering Economic Decision Analysis, Industrial Systems Engineering Economic Decision Analysis at Georgia Institute of Technology
Github Skills (13)
python10
back-end-development10
django10
devops9
postgresql9
aws-cloudformation8
data-engineering8
clickhouse7
kubernetes6
typescripts6
typescript6
kubernetes-pods6
typescript-types6
Programming languages (18)
Github contributions (5)
PostHog/posthog
May 2020 - Dec 2022
🦔 PostHog provides open-source web & product analytics, session recording, feature flagging and A/B testing that you can self-host. Get started - free.
Role in this project:
Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:633 reviews, 358 commits, 778 PRs in 2 years 7 months
Contributions summary:James primarily contributed to optimizing the funnel rendering feature by implementing lateral joins and addressing type errors. They were involved in the deployment process to ECS using CloudFormation and worked on bug fixes related to CloudFormation. The user also addressed code quality by adding type annotations and cleaning up comments. The user's work also touched upon infrastructure tasks as demonstrated by their contributions to the deployment process.
pythonabtestingdata-warehouseself-hostjavascript
PostHog/posthog-flutter
Jun 2020 - Feb 2022
PostHog Flutter SDK
Contributions:6 releases, 8 reviews, 43 commits in 1 year 7 months
in-app-purchasedartiosflutterposthog
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