Kulveer

Visiting Partner @ycombinator. Backing high-output YC founders via @phosphorcap. Previously founded and sold @ZeusLiving (S11) & @auctomatic (W07).

[Kulveer @kul]

Joining @ycombinator as a Visiting Partner for the Spring 2026 batch.

Feels a bit full circle.

[Adish Jain ☕️ @_adishj]

we’re launching Motion, the frontier agent for tasteful motion design.

this launch video is made entirely with Motion. 👇🏽

QT + comment "MOTION" to get 1,000 free credits.

tag @motion_so in any X post for a surprise.

now generally available at motion [dot] so.

[George Jefferson @GeorgeJeffersn]

🚨 Introducing the world's first AI growth team:

[Rohin Dhar @rohindhar]

I think what often gets missed

Is Y Combinator moving to SF in 2023

May be what ends up having the biggest economic impact on San Francisco eventually

Just a machine gun of billion dollar companies being produced quarterly in SF, some that will grow much much bigger

[Harsha Gaddipati @GaddipatiHarsha]

Excited to announce Slashy

The first email client that works for you.

The real cost of email isn't the time. It's the mental load of constantly checking it, just in case something needs you.

Slashy kills that. You never need to open your inbox unless Slashy tells you.

Try it out at https://t.co/6tuQxWV7KR

[Tom Blomfield @t_blom]

I turned up at the YC office this morning to find @ApolloAtomics installing the primary loop autoclave for their nuclear reactor 😬

It’s the new component that means their SMRs will be 80% smaller than traditional designs.

[Coffee with One 🇺🇸 @coffeewithone]

Watched a customer spend 6 hrs straight in @octolane today.
Years of building AI CRM taught us one thing worth saving:

1. There's a specific number that unlocks activation
2. There's a specific feature set + specific numbers that unlocks retention

When you find both of them, there's no going back.

But how did we find ours?

🚀 Activation: Look at every user who converted to paid. What's that one behavior they all did in week 1 that churned users didn't? That's gonna be your activation event. Now your job to find the smallest number of repetitions that predicts conversion.

🔄 Retention: Research your month 2 retained users. What combination of features did they use in weeks 2 to 4 that churned users skipped? That's your retention game will surface.

Sounds obvious but I promise you It's not gonna be when you're in it.

We cracked activation first. Then retention. Both took painful iteration, shipping, breaking, rebuilding, shipping again. It was an excruciating process for us where we were not sure if we're getting closer or just running in circles. Until suddenly you are, and you can't unsee it.

Teams are now migrating from HubSpot, Pipedrive, and Attio to Octolane. We did zero outbound and all word of mouth.

Because the agent-first economy lets us solve the edges incumbents can't.

Founders, what number unlocked activation for you?

[Kulveer @kul]

Useful!

[Ali Haghani @iAligator]

Circleback now captures what's on screen, not just what's said.

this matters most for ai agents. a number on a dashboard, pricing on a slide, a deadline in a doc. all of it is now available to the assistant and any agent you connect.

as more work gets done by agents, the context layer matters more than the notes.

[Skyler Chan @skyler_chan_]

At GRU, we only hire killers. Last week, our latest founding mechanical engineer quit SpaceX pre-IPO pre-full vest to join GRU.

Now I’m hiring a Founding Avionics Engineer. You will own the brains of the machine that will make the world’s first bricks on the Moon next year.

This is literally the most exciting startup you will ever work at in your life, possibly, in our generation. This is a massive responsibility. You will work long hours. You will work against the clock, racing to build the avionics systems necessary, to turn our payload on and breathe life on the Moon. Life is short, and we are all going to pass one day. Do you want to live an average life, working as a cog in the machine, or do you want to be remembered in the stars? The reward is not material, but in doing your life’s work.

If you choose to accept the challenge, email me directly at [email protected] with 3 bullet points:

1. What avionics or boards have you built that has flown into space/landed on the Moon/landed on Mars? Evidence of flight heritage
2. What are you world class at?
3. Why is being part of shaping human history via building the first bricks on the Moon, cities on the Moon and Mars, ultimately impacting trillions of future unborn lives that will walk the roads and infrastructure we build at GRU is too existential to not work on to you?

Application Link: https://t.co/YiB02D9YuU

[nico laqua @nico_laqua]

We raised another $106M at a $2.6B valuation since announcing our last round three weeks ago.

Corgi has grown exponentially in the past couple of months, but we're only just getting started transforming one of the largest sectors in the US economy: insurance.

[Garry Tan @garrytan]

https://t.co/cRwIIexCa9

[Kulveer @kul]

Excited about @apolloatomics!

[Y Combinator @ycombinator]

.@ApolloAtomics builds the most compact nuclear reactors with the highest uptime and a deployment time of less than 24 months.

Apollo took the pressurized water reactor technology that already powers 80% of the world’s nuclear plants and flipped one part, the steam generator, to make the plant an order of magnitude smaller without compromising power.

Congrats on the launch, @AssilHalimi & Drew!

https://t.co/5lGDpZhmQ5

[Hyper @heyhyperai]

🚨 HUGE ANNOUNCEMENT 🚨

hyper is now available to download directly from our website

[Y Combinator @ycombinator]

58% of the $400B call center industry runs on on-prem phone systems, and until now, bringing AI voice automation to them meant ripping out their entire infrastructure first.

@Callab_AI connects directly to legacy PBX systems like Cisco UCM and Mitel, with no migration needed.

Congrats on the launch, @haithemkchaou & @chehir_dh!

https://t.co/NmIqA2tL0t

[Kulveer @kul]

@ycombinator @deepitshah5 @JayMehta446970 @_sarthak____ @somanshshah congrats on launch!

[Y Combinator @ycombinator]

StableBrowse is a new browser layer for AI agents. They enable agents to navigate the web with 70% fewer tokens and 3-4x faster execution.

Congrats on the launch, @deepitshah5, @JayMehta446970, @_sarthak____, and @somanshshah!

https://t.co/ectpPwvkJ6

[Kulveer @kul]

@LajmiRihab @ycombinator @t_blom crushing!

[Rihab Lajmi @LajmiRihab]

.Since joining .@ycombinator we 2x'd revenue, onboarded top US staffing agencies, sponsored 4 industry events, and hosted a 700-person webinar.

Here's what we learned working alongside .@t_blom and .@kul

[Tom Blomfield @t_blom]

A founder just apologized for dialing in to office hours from a car. It’s the sixth time he’s done this.

He spends close to 100% of his time meeting customers in unglamorous places a long way from San Francisco.

I wish more founders did this.

[Y Combinator @ycombinator]

Revnu (@revnu_app) makes growth a solved problem. With AI now anyone can build a product, but with Revnu anyone can sell it.

You never have to hire a growth person again. Technical teams focus on building, while Revnu handles the rest.

Congrats on the launch, @artfreebrey & @GeorgeJeffersn!

https://t.co/0SfWw9kGAY

[Kulveer @kul]

@ycombinator @revnu_app @artfreebrey congrats on launch!