Jeff Chen

This summer, NCAA Division I voted to remove altitude and track-size conversions, which had been in place since 1981, claiming that "there is no true science being applied."

I've been playing with InstantDB and Tanstack Router recently.

Despite turning 30 last November, I ran my fastest times ever this year: 6.78 in the 60m, 10.55 in the 100m, and 21.26 in the 200m.

Tracking a record's last modified time is a common application requirement.

Almost four years ago, I wrote a post about the relationship between temperature and speed, finding a linear relationship on 30m fly times with an R² of 0.21.

I built a tool that predicts your 100m time given practice results—go check it out!

After a disappointing end to my season, I spent some time reflecting on what went wrong and what I can do better this year.

Most of the posts on this blog are about success.

Intro: what it is, what it purports to do

At some point in our lives, as the story goes, the years start to blur together.

I moved to Montana this summer.

This year, Adidas entered the superspike game with their Prime SP2.

EF Core generates and stores a full snapshot of the database for every migration.

Track has been the most constant part of my life these past few years—through job changes, moves, and a global pandemic, I've hit the track and competed.

At Vesta, we have a multi-tenant application where tenant data is logically separated in our Postgres instance by a tenant\_id column on entity tables.

I'm often asked by non-athletes what my mile time is when I tell them I'm a sprinter.

Want to convert your own times?

Now that it's 2022, I've scored my 2021 predictions.

November was... busy.

I'll be taking a break from weekly posts for a little while!

October was my first full month in Atlanta since May—but I still found a way to get out of town for a couple of weekends.

One thing role-playing games get right about life is the concept of experience points.

My first day at Vesta was three weeks ago—long enough for me to have some initial thoughts about joining.

I was recently working in a fairly new React/TypeScript codebase that was growing quickly.

September was eventful!

Last winter, I published Temperature and Speed, which looked at the correlation between my 30-meter fly times and the ambient temperature.

Multi-factor authentication is becoming increasingly prevalent.

I've recently been looking into various row-level security schemas for Postgres, and came across this excellent article benchmarking a few different architectures for row-level security.

I think one of the most predictive features for personal happiness is whether you have high-quality hobbies.

My time in Montana is coming to an end—I'll be spending the next few days camping in Glacier National Park, then heading back down to Atlanta.

The central concept in James C.

Laddered Engineering ability can be boiled down into a single "level".

When's the last time you looked around for a new job?

Another year, another track season.

July was busy: we hosted my parents and some friends in Montana for the first two weeks, I traveled to Des Moines for the USATF Masters Championships, and I'm writing this on the way to Chicago for a bachelor party.

Genetics clearly influence sprint performance—but by how much?

Last week, I got my hands on a pair of New Balance's sprint spikes for 2021, the FuelCell Sigma SD-X.

I've spent the last couple hours trying to rebuild my mood tracker—although notifications still work, opening the app throws the error "'mood' Is No Longer Available".

Just as I've settled into a pretty good groove in Atlanta, I spent the past few days driving across the country again, this time to Livingston, Montana where I'll be spending the next two months!

I moved to Atlanta two months ago; here are some disorganized impressions of Atlanta and the Southeast:

Sleep is a competitive advantage: good sleep is associated with improved short and long-term memory, muscle synthesis, and muscle recovery, while sleep deprivation impairs cognitive performance and increases injury risk.

Go to any American track meet and you'll notice a striking lack of Asian participants.

My first month in Atlanta has been a blast: I drove across the country, competed in my first races in 15 months, met some friends in person for the first time in a long time, and am writing this from Charleston where I'm spending Memorial Day!

Managers and leaders often fall into the trap of drowning out their reports' voices with their own.

5/8: Atlanta Track Club—Spring Track Meet #3 My first official meet in 15 months!

I wrote Part 1 of this post back in February, demonstrating how to measure Next.js bundle sizes with GitHub Actions.

Be Patient.

I drove across the country to my new home this weekend—Atlanta.

I'm writing this from Denver—I'm moving to Atlanta!

One important difference between junior and senior engineers is that senior engineers take responsibility for the software the team ships.