Kenneth Sinder
Senior Software Engineer at Notion
Israeli-Canadian software engineer living in San Francisco, California, USA.
Currently working at Notion on the public API, building platforms that make your workspace (and life) more connected.
Previously worked on Stripe Billing for over 4 years, helping online businesses build recurring revenue.
I dabble in personal finance, running, making awesome jokes, & writing. I love listening to indie tunes and synthpop on Spotify.
Quick Facts
San Francisco, CA
Notion
BSE Software Eng, Waterloo
APIs, Full-Stack, Infrastructure
Summary
Software engineer with 8+ years of experience. Passionate about API design and debugging. Most recently: pioneering cool stuff with MCP and agents.
Python
Ruby
JavaScript
TypeScript
Java
C#
C++
Scala
React
Django
REST APIs
Angular
Vue
Flask
Laravel
Experience
- Senior engineer on Developer Interfaces (formerly Public API), building Notion's API and developer platform.
- Shipped Notion MCP, Notion's patent-pending hosted MCP server, with launch partners OpenAI, Anthropic, and Cursor (inside look).
- Made Notion MCP 2x faster in October 2026, cutting Notion API event-loop delay by over 90%.
- Leading Tool Core: one shared tool engine behind the Notion API, MCP, CLI, and Custom Agents.
- Built Notion's MCP App for ChatGPT and shipped enterprise-managed auth for Notion MCP with Okta and Anthropic.
- Shipped the File Upload API, integration webhooks, and markdown APIs.
- Built new business models and enterprise contract management support into Stripe Billing.
- Designed and implemented Stripe Tax integration for subscriptions and invoices.
- Evolving and maintaining high-volume global recurring revenue APIs and infrastructure.
- Designed API for storing metadata for third-party to LinkedIn HDFS big data ingestion.
- Created customizable web UI internal tool for collecting Q&A answers and metadata.
- — Reduced time to onboard new data integrations from months to days.
- Interned on the Stripe Billing team.
- Worked on the Wish e-commerce platform.
- Full-stack development on the Hootsuite social media management platform.
- Developed software for casino floor optimization.
- Developed software for Canada's national research and education network.
Education
- Attained Dean's Honours List every term for consistently averaging in top 10%.
- Learned C, C++, Scala, OCaml, and Assembly (MIPS/ARM) in regular and enriched courses.