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Discovering Tomorrow's PayPal Mafia Today

Highlighting founders emerging from top startups

Read by investors managing $100B+ AUM. Limited to 200 members.

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4.7.26 - SpaceX Mafia Pt. 2
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Top Posts

4.7.26 - SpaceX Mafia Pt. 2

Shield AI’s Co-CTO, 14-year SpaceX Director, Starlink engineering leads, founders of $100M+ startups, and Anduril leaders building next-gen space and autonomy startups
4.6.26 - The SpaceX Mafia
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SpaceX

4.6.26 - The SpaceX Mafia

Veteran SpaceX engineers and Starlink directors, ex–Anduril/Mach leaders, Founders Fund & Khosla-backed founding employees, and repeat YC Founders building in space and defense
3.30.26 - The Physical Intelligence & Mistral Mafia
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Early Team

3.30.26 - The Physical Intelligence & Mistral Mafia

Founding MTS @ Physical Intelligence, Mistral Founding Member, Anduril early SF engineer, Mistral researchers from DeepMind, OpenAI, and Meta FAIR (Llama), and a founding team member from Bessemer-backed Sett
4.1.26 - Lightspeed-backed Founder, Crosby Builder, and Factory Engineers Starting New
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Lightspeed

4.1.26 - Lightspeed-backed Founder, Crosby Builder, and Factory Engineers Starting New

ScaleOps CTO ($800M valuation) and early builders from Crosby, Variance, and Factory (~$60M ARR, 6x growth).
3.31.26 - The Saronic & Whoop Mafia
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Kleiner Perkins

3.31.26 - The Saronic & Whoop Mafia

WHOOP’s CTO (ex–Waymo Chief Engineer, Apple Autonomy, $130M co-founder), Saronic engineers launching a16z- and Boost-backed startups, a YC F25 repeat founder, and Whirl AI’s founding engineer
3.30.26 - The Physical Intelligence & Mistral Mafia
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Early Team

3.30.26 - The Physical Intelligence & Mistral Mafia

Founding MTS @ Physical Intelligence, Mistral Founding Member, Anduril early SF engineer, Mistral researchers from DeepMind, OpenAI, and Meta FAIR (Llama), and a founding team member from Bessemer-backed Sett
3.27.26 - Top Founders of the Week
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Top Founders of the Week

3.27.26 - Top Founders of the Week

Kalshi’s 1st FTE, Anduril’s Chief Engineer, Shield AI's COO, Dreamer's CTO, and an Early Palantir Member.
3.26.26 - The Shield AI Mafia
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A16Z

3.26.26 - The Shield AI Mafia

Shield AI’s COO turned founder, Anduril’s former Chief Engineer, Tesla Cybertruck lead and Mach Industries build head, Founders Fund/Index-backed founding ML engineer, and a $100M Felicis-backed founder transitioning out of CEO
3.25.26 - Founding Members from Verily, Cape, Halter and a Repeat 8-Figure Founder
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Verily

3.25.26 - Founding Members from Verily, Cape, Halter and a Repeat 8-Figure Founder

Verily's founding GM, a16z Bio Fund partner, $70M founder with Tempus exit, Lilac AI's 1st engineer (acquired by Databricks), Cape's founding SWE & 11-year Palantir tech lead, and the early Halter team
3.24.26 - A16Z-backed Founder, Post-Acquisition Founders from Amazon and Meta Deals, Plus Shepherd's Day-One Engineers
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A16Z

3.24.26 - A16Z-backed Founder, Post-Acquisition Founders from Amazon and Meta Deals, Plus Shepherd's Day-One Engineers

Fauna Robotics co-founder (NYU prof, ex-OpenAI) building in robotics again, Dreamer CTO and 3rd FTE now free agents, Shepherd's 1st FTEs, and repeat founders across Aviato, Riveter, and Daedalus
3.23.26 - The Kalshi Mafia
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Kalshi

3.23.26 - The Kalshi Mafia

Kalshi’s 1st FTE, founding engineers behind the core trading product, former Chief of Staff, and a YC-backed repeat founder.
3.20.26 - Top Founders of the Week
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Top Founders of the Week

3.20.26 - Top Founders of the Week

Repeat founder (prior exit), founding engineers behind Rox ($1.2B) and Sunday ($165M), plus YC and Z Fellows-backed founders
3.19.26 - Repeat Founder, ex GC-backed Founding Team, and an IOI Gold Medalist
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General Catalyst

3.19.26 - Repeat Founder, ex GC-backed Founding Team, and an IOI Gold Medalist

Posh's Co-Founder, Founding Members of Autoscience, MIT student with IOI gold medals, and key Arc operators
3.18.26 - Founding Operators from Paraform & Hanover Park
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Scale

3.18.26 - Founding Operators from Paraform & Hanover Park

Paraform & Hanover Park founding operators, and early builders across Axiamatic, Grow Therapy, and Andromeda
3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers
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Bessemer

3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers

Atlassian-acquired founder on his 4th act, co-founders of Tamarind Bio & DiligenceSquared, Quince’s CRO, and founding engineers from Gushwork & Translucent

Repeat Founder

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4.17.26 - Top Founders of the Week
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Top Founders of the Week

4.17.26 - Top Founders of the Week

Founders from Flock Safety’ Function Health, Pillar, Founding Engineers from Mintlify, and Starfish Space’s Chief Engineer
4.15.26 - Flock CTO, Parasail Founding Engineer, and a Repeat YC Founder
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Flock

4.15.26 - Flock CTO, Parasail Founding Engineer, and a Repeat YC Founder

Flock Safety’s Founder & CTO + early Flock engineering leaders, Parasail’s founding engineer, and a YC-backed founder (Code Four)
4.14.26 - Mintlify’s 1st FTE, YC Founders, Abstract-Backed Founding Engineer, and an IMO Medalist
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A16Z

4.14.26 - Mintlify’s 1st FTE, YC Founders, Abstract-Backed Founding Engineer, and an IMO Medalist

Mintlify’s first engineer, YC-backed founders, Founding Teams from Build & Chapter, and an IMO medalist

Founding Engineer

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4.17.26 - Top Founders of the Week
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Top Founders of the Week

4.17.26 - Top Founders of the Week

Founders from Flock Safety’ Function Health, Pillar, Founding Engineers from Mintlify, and Starfish Space’s Chief Engineer
4.16.26 - The Resolve AI Mafia & A16Z-backed Founder & First Engineer
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A16Z

4.16.26 - The Resolve AI Mafia & A16Z-backed Founder & First Engineer

Pillar’s Co-Founder & CEO and first engineer, early engineers from Resolve AI, and Slate Auto’s Head of Automotive Software (ex-Tesla Director) turned founder
4.15.26 - Flock CTO, Parasail Founding Engineer, and a Repeat YC Founder
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Flock

4.15.26 - Flock CTO, Parasail Founding Engineer, and a Repeat YC Founder

Flock Safety’s Founder & CTO + early Flock engineering leaders, Parasail’s founding engineer, and a YC-backed founder (Code Four)

Repeat Founding Engineer

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4.16.26 - The Resolve AI Mafia & A16Z-backed Founder & First Engineer
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A16Z

4.16.26 - The Resolve AI Mafia & A16Z-backed Founder & First Engineer

Pillar’s Co-Founder & CEO and first engineer, early engineers from Resolve AI, and Slate Auto’s Head of Automotive Software (ex-Tesla Director) turned founder
4.14.26 - Mintlify’s 1st FTE, YC Founders, Abstract-Backed Founding Engineer, and an IMO Medalist
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A16Z

4.14.26 - Mintlify’s 1st FTE, YC Founders, Abstract-Backed Founding Engineer, and an IMO Medalist

Mintlify’s first engineer, YC-backed founders, Founding Teams from Build & Chapter, and an IMO medalist
4.10.26 - Top Founders of the Week
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Top Founders of the Week

4.10.26 - Top Founders of the Week

Mach Industries CTO, Early Anduril Engineering Leader, senior SpaceX Directors & Leaders, Hermeus Co-Founders, and Stipple Bio’s Co-Founder & CTO

AI

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4.16.26 - The Resolve AI Mafia & A16Z-backed Founder & First Engineer
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A16Z

4.16.26 - The Resolve AI Mafia & A16Z-backed Founder & First Engineer

Pillar’s Co-Founder & CEO and first engineer, early engineers from Resolve AI, and Slate Auto’s Head of Automotive Software (ex-Tesla Director) turned founder
4.15.26 - Flock CTO, Parasail Founding Engineer, and a Repeat YC Founder
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Flock

4.15.26 - Flock CTO, Parasail Founding Engineer, and a Repeat YC Founder

Flock Safety’s Founder & CTO + early Flock engineering leaders, Parasail’s founding engineer, and a YC-backed founder (Code Four)
4.14.26 - Mintlify’s 1st FTE, YC Founders, Abstract-Backed Founding Engineer, and an IMO Medalist
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A16Z

4.14.26 - Mintlify’s 1st FTE, YC Founders, Abstract-Backed Founding Engineer, and an IMO Medalist

Mintlify’s first engineer, YC-backed founders, Founding Teams from Build & Chapter, and an IMO medalist

Applied AI

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3.18.26 - Founding Operators from Paraform & Hanover Park
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Scale

3.18.26 - Founding Operators from Paraform & Hanover Park

Paraform & Hanover Park founding operators, and early builders across Axiamatic, Grow Therapy, and Andromeda
3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers
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Bessemer

3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers

Atlassian-acquired founder on his 4th act, co-founders of Tamarind Bio & DiligenceSquared, Quince’s CRO, and founding engineers from Gushwork & Translucent
2.20.26 - Top Founders of the Week
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Sante

2.20.26 - Top Founders of the Week

Head of ML at PolyAI, Stash’s co-founder post-sale, Lily Robotics and Jyve repeat founders, and Grafana’s post-acquisition builders

Fintech

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4.14.26 - Mintlify’s 1st FTE, YC Founders, Abstract-Backed Founding Engineer, and an IMO Medalist
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A16Z

4.14.26 - Mintlify’s 1st FTE, YC Founders, Abstract-Backed Founding Engineer, and an IMO Medalist

Mintlify’s first engineer, YC-backed founders, Founding Teams from Build & Chapter, and an IMO medalist
4.5.26 - Top Founders of the Week
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Top Founders of the Week

4.5.26 - Top Founders of the Week

Founding MTS @ Physical Intelligence, Mistral researchers from DeepMind, OpenAI, and Meta FAIR, WHOOP CTO, Saronic robotics architect, and Mercury founders with exits to Chime and GM
2.27.26 - Top Founders of the Week
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Top Founders of the Week

2.27.26 - Top Founders of the Week

Co-Founders of Cursor, Freeform, Fluidstack, Orum; creators of Stripe Checkout/Atlas/Connect/Dashboard; Playco CTO & Statsig founding engineer

Infrastructure

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4.16.26 - The Resolve AI Mafia & A16Z-backed Founder & First Engineer
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A16Z

4.16.26 - The Resolve AI Mafia & A16Z-backed Founder & First Engineer

Pillar’s Co-Founder & CEO and first engineer, early engineers from Resolve AI, and Slate Auto’s Head of Automotive Software (ex-Tesla Director) turned founder
4.13.26 - $2.5B Founder, $50M+ Exit Founder, and Starfish Chief Engineer
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Function Health

4.13.26 - $2.5B Founder, $50M+ Exit Founder, and Starfish Chief Engineer

Function Health CTO, Getlabs Founder (YC → acquired), Starfish Chief Engineer ($150M+), and SiFive SVP & GM ($3.6B)
3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers
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Bessemer

3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers

Atlassian-acquired founder on his 4th act, co-founders of Tamarind Bio & DiligenceSquared, Quince’s CRO, and founding engineers from Gushwork & Translucent

Defense

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3.9.26 - The Anduril Mafia
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Founders Fund

3.9.26 - The Anduril Mafia

Anduril Chief Engineer, Mach Industries CTO, Founding MTS at Physical Intelligence, and other Anduril engineering leaders from SpaceX, CIA, and Uber ATG
2.5.26 - Repeat Founders Backed by Khosla & Bessemer in Stealth
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Crypto

2.5.26 - Repeat Founders Backed by Khosla & Bessemer in Stealth

Former Drift, Turnstile, Machina Labs, Second Measure founders, alongside operators from Goodfire, TRM Labs, and Fibr
1.14.26 - The Etched Mafia
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Founder

1.14.26 - The Etched Mafia

Senior MTS and founding ML scientists from Etched, defense AI founders from Harmattan, and early product and AI leaders emerging from Aikido Security and Converge Bio.

Biotech

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4.10.26 - Top Founders of the Week
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Top Founders of the Week

4.10.26 - Top Founders of the Week

Mach Industries CTO, Early Anduril Engineering Leader, senior SpaceX Directors & Leaders, Hermeus Co-Founders, and Stipple Bio’s Co-Founder & CTO
4.9.26 - Khosla-Backed Unicorn Founders, a $100M a16z-Backed Bio Founder, and Early Sarvam & AfterQuery Builders
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Healthcare

4.9.26 - Khosla-Backed Unicorn Founders, a $100M a16z-Backed Bio Founder, and Early Sarvam & AfterQuery Builders

Hermeus Co-Founders & first avionics hire turned YC-backed founder, Stipple Bio’s Co-Founder & CT), and early Sarvam AI & AfterQuery team
3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers
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Bessemer

3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers

Atlassian-acquired founder on his 4th act, co-founders of Tamarind Bio & DiligenceSquared, Quince’s CRO, and founding engineers from Gushwork & Translucent

Healthcare

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4.14.26 - Mintlify’s 1st FTE, YC Founders, Abstract-Backed Founding Engineer, and an IMO Medalist
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A16Z

4.14.26 - Mintlify’s 1st FTE, YC Founders, Abstract-Backed Founding Engineer, and an IMO Medalist

Mintlify’s first engineer, YC-backed founders, Founding Teams from Build & Chapter, and an IMO medalist
4.13.26 - $2.5B Founder, $50M+ Exit Founder, and Starfish Chief Engineer
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Function Health

4.13.26 - $2.5B Founder, $50M+ Exit Founder, and Starfish Chief Engineer

Function Health CTO, Getlabs Founder (YC → acquired), Starfish Chief Engineer ($150M+), and SiFive SVP & GM ($3.6B)
4.9.26 - Khosla-Backed Unicorn Founders, a $100M a16z-Backed Bio Founder, and Early Sarvam & AfterQuery Builders
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Healthcare

4.9.26 - Khosla-Backed Unicorn Founders, a $100M a16z-Backed Bio Founder, and Early Sarvam & AfterQuery Builders

Hermeus Co-Founders & first avionics hire turned YC-backed founder, Stipple Bio’s Co-Founder & CT), and early Sarvam AI & AfterQuery team

Crypto

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3.18.26 - Founding Operators from Paraform & Hanover Park
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Scale

3.18.26 - Founding Operators from Paraform & Hanover Park

Paraform & Hanover Park founding operators, and early builders across Axiamatic, Grow Therapy, and Andromeda
2.5.26 - Repeat Founders Backed by Khosla & Bessemer in Stealth
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Crypto

2.5.26 - Repeat Founders Backed by Khosla & Bessemer in Stealth

Former Drift, Turnstile, Machina Labs, Second Measure founders, alongside operators from Goodfire, TRM Labs, and Fibr
1.22.26 - Cosmos Founder Starting Anew and The Anchorage & BitGo Mafias
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Crypto

1.22.26 - Cosmos Founder Starting Anew and The Anchorage & BitGo Mafias

A Cosmos co-founder, Anchorage founding engineers, and repeat founders within BitGo.

Cybersecurity

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3.26.26 - The Shield AI Mafia
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A16Z

3.26.26 - The Shield AI Mafia

Shield AI’s COO turned founder, Anduril’s former Chief Engineer, Tesla Cybertruck lead and Mach Industries build head, Founders Fund/Index-backed founding ML engineer, and a $100M Felicis-backed founder transitioning out of CEO
2.4.26 - Repeat Founders with $200M Exit, USV-Backed Founder, and Celestial AI's CTO
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Founding Engineer

2.4.26 - Repeat Founders with $200M Exit, USV-Backed Founder, and Celestial AI's CTO

Repeat founders from the Day AI founder’s prior startup, a USV-backed founder, Celestial AI's CTO, and early builders from Uptool, Kindred, and Claroty.
1.14.26 - The Etched Mafia
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Founder

1.14.26 - The Etched Mafia

Senior MTS and founding ML scientists from Etched, defense AI founders from Harmattan, and early product and AI leaders emerging from Aikido Security and Converge Bio.

SaaS

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3.18.26 - Founding Operators from Paraform & Hanover Park
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Scale

3.18.26 - Founding Operators from Paraform & Hanover Park

Paraform & Hanover Park founding operators, and early builders across Axiamatic, Grow Therapy, and Andromeda

Robotics

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4.5.26 - Top Founders of the Week
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Top Founders of the Week

4.5.26 - Top Founders of the Week

Founding MTS @ Physical Intelligence, Mistral researchers from DeepMind, OpenAI, and Meta FAIR, WHOOP CTO, Saronic robotics architect, and Mercury founders with exits to Chime and GM
2.27.26 - Top Founders of the Week
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Top Founders of the Week

2.27.26 - Top Founders of the Week

Co-Founders of Cursor, Freeform, Fluidstack, Orum; creators of Stripe Checkout/Atlas/Connect/Dashboard; Playco CTO & Statsig founding engineer
2.2.26 - Poetiq + Kaia Health Founders and Founding Engineers from Fieldguide, Concourse, and RobCo
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Frontier AI

2.2.26 - Poetiq + Kaia Health Founders and Founding Engineers from Fieldguide, Concourse, and RobCo

Poetiq’s co-founder, Kaia Health’s founding team post-acquisition, and early engineers from Fieldguide, Concourse, and RobCo.

American Dynamism

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4.15.26 - Flock CTO, Parasail Founding Engineer, and a Repeat YC Founder
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Flock

4.15.26 - Flock CTO, Parasail Founding Engineer, and a Repeat YC Founder

Flock Safety’s Founder & CTO + early Flock engineering leaders, Parasail’s founding engineer, and a YC-backed founder (Code Four)
4.10.26 - Top Founders of the Week
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Top Founders of the Week

4.10.26 - Top Founders of the Week

Mach Industries CTO, Early Anduril Engineering Leader, senior SpaceX Directors & Leaders, Hermeus Co-Founders, and Stipple Bio’s Co-Founder & CTO
4.9.26 - Khosla-Backed Unicorn Founders, a $100M a16z-Backed Bio Founder, and Early Sarvam & AfterQuery Builders
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Healthcare

4.9.26 - Khosla-Backed Unicorn Founders, a $100M a16z-Backed Bio Founder, and Early Sarvam & AfterQuery Builders

Hermeus Co-Founders & first avionics hire turned YC-backed founder, Stipple Bio’s Co-Founder & CT), and early Sarvam AI & AfterQuery team