Jeff Kershner

Built game engines in C++, scaled AI to 1,200+ retail stores, led distributed teams across 3 countries. Looking for my next engineering leadership challenge.

[Jeff Kershner @kershnerd]

Testing JoltPhysics out in my Vulkan renderer:
https://t.co/f3T2oa7KiR

#vulkan #cpp

[Jeff Kershner @kershnerd]

Vulkan renderer with realtime shadows, MSAA, Jolt physics at sunset:

https://t.co/ivW3jPyIl2

#cpp #vulkan #jolt

[Jeff Kershner @kershnerd]

Expert React/NextJS/FastAPI Python developer thinking about trying out https://t.co/3etggSrU5V Blazor for a while.

Good idea? or Talk me out of it!

#Csharp #aspnet #react #blazor @shanselman

[Jeff Kershner @kershnerd]

The essay is outstanding and warrants a thorough read by all.

[Jeff Kershner @kershnerd]

I wonder what a technical interview would be at @AnthropicAI

Anthropic: code this merge sort and tell me what the big OH is.

Interviewer: sure… give me a moment to as Claude Code.

Anthropic: you’re hired!

[Jeff Kershner @kershnerd]

I showed my son how to use the chrome inspector to make changes to a live website's DOM. Now he thinks he changed the live website for everyone!

This is how hacking starts...

[Jeff Kershner @kershnerd]

Hot take: If you're not enforcing type safety across your full stack, shared types between frontend and backend, you haven't felt the pain yet.

I've seen what happens at scale: a backend contract changes, the frontend silently breaks, and suddenly you're debugging at midnight wondering why the data looks wrong. A shared type layer (tRPC, OpenAPI codegen, or even a simple shared types package) turns that class of bug into a compile-time error instead of a production incident.

This isn't about being pedantic. It's about respecting your teammates' time and your future self's sanity.

If you've worked on a real team shipping real features at real velocity, you already know this. If you haven't... you will.
#TypeScript #FullStack #EngineeringCulture #SoftwareDevelopment

[Jeff Kershner @kershnerd]

@sama I’m upping my Claude code max plan subscription with @AnthropicAI

[Jeff Kershner @kershnerd]

I just learned that “vibe coding” is asking AI to write code and shipping without even looking at the code! For real?

[Jeff Kershner @kershnerd]

@camski Ozempic is not for you.

[Jeff Kershner @kershnerd]

@davepl1968 The shit we did in C in the late 90s (before YouTube, StackOverflow, and LLMs) still blows my mind.

[Jeff Kershner @kershnerd]

Fixed a bug where the neondb connection pool wasn't working correctly.

Give it a try at https://t.co/WlbD4Qx0w0

[Jeff Kershner @kershnerd]

Playing around with a market dashboard with real-time market data (well free API is 15 min behind).

Using @reactjs deployed on @Cloudflare pages, @Railway for the FastAPI and @Finnhub_io for the free API for market data.

This is just a fun project if anyone wants to try it yourself.

[Jeff Kershner @kershnerd]

TypeScript without generics is just JavaScript with extra steps. One function. Any type. Zero any.

The type travels with your data — all the way from the API call to your component. Your editor autocompletes. Typos get caught at compile time. Refactors become safe.

https://t.co/uy8C0cl9Xz

#TypeScript #WebDev #WebDevelopment

[Jeff Kershner @kershnerd]

Happy lunar new year!

[Sam Altman @sama]

Peter Steinberger is joining OpenAI to drive the next generation of personal agents. He is a genius with a lot of amazing ideas about the future of very smart agents interacting with each other to do very useful things for people. We expect this will quickly become core to our product offerings.

OpenClaw will live in a foundation as an open source project that OpenAI will continue to support. The future is going to be extremely multi-agent and it's important to us to support open source as part of that.

[Jeff Kershner @kershnerd]

@tymofii @reactjs @Cloudflare @Railway @Finnhub_io Good to know and thanks for sharing!

[Jeff Kershner @kershnerd]

Playing around with a market dashboard with real-time market data (well free API is 15 min behind).

Using @reactjs deployed on @Cloudflare pages, @Railway for the FastAPI and @Finnhub_io for the free API for market data.

This is just a fun project if anyone wants to try it yourself.

[Jeff Kershner @kershnerd]

You can try it out (always for free) at:
https://t.co/WlbD4Qx0w0

[Jeff Kershner @kershnerd]

My favorite quote from @shanselman :
"I can't believe we are getting beat by a bookstore!"