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Off by One

Hi. My name is Can Duruk. I'm the former CTO of Felt and an early engineer at Uber .

Here I write about engineering management (5) , tech industry (9) , and other (3) topics (10) .

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Latest posts

The Math of Why You Can't Focus at Work

Interruptions, recovery time, and task size: three numbers that determine if you'll get real work done. Interactive visualizations show the math behind bad days.

November 24, 2025
22 min read
Take-Home Exercises

How to design effective take-home exercises that assess both ability and interest, with practical guidelines on scope, payment, and AI-assisted work

October 31, 2025
9 min read
Avoiding the Trailing Slash Tax on Github Pages and Astro

A deep dive into how GitHub Pages handles trailing slashes, the hidden redirect cost, and why every millisecond matters for user experience

October 28, 2025
6 min read
Interactive Hiring Pipeline Calculator

Calculate how many candidates you need to reach out to make one hire based on your conversion rates.

October 26, 2025
3 min read
Running 1:1s for Engineers

A practical, repeatable framework for running weekly engineering 1:1s using the People, Product, Process structure—with exact scripts, Notion setup, and tips for making them actually useful.

October 21, 2025
10 min read

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