Founding Jobs Posted on X (Twitter)

we're hiring a founding design engineer! @orchard_robots apply here: jobs.ashbyhq.com/orchard/1dc6ba…

Watch on X

11:45 PM · Aug 20, 2026

12

designengineeringfoundingstartup

Founding Engineer

Polar Browser

Founding engineer for an AI browser that automates hours of work. Email hiring@polarbrowser.com with 2–3 extraordinary things you've done.

Aug 20, 2026

Kevin Jiang

@jiang_kev

This is @PolarBrowser's ARR with 3 people. Now, we’re hiring a founding engineer and designer to multiply a billion knowledge workers. We’re obsessed with problems like: → How do you build systems that scale agents to automate the company? One thing more important than Show more

3:04 PM · Aug 19, 2026

34

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engineeringfoundingstartupai

Founding Designer

Polar Browser

Founding designer for an AI browser a billion knowledge workers could use every day.

Aug 20, 2026

Kevin Jiang

@jiang_kev

This is @PolarBrowser's ARR with 3 people. Now, we’re hiring a founding engineer and designer to multiply a billion knowledge workers. We’re obsessed with problems like: → How do you build systems that scale agents to automate the company? One thing more important than Show more

3:04 PM · Aug 19, 2026

34

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designfoundingstartupai

Founding Security Engineer

The Bitcoin Way

Founding security engineer for self-hosted Bitcoin infrastructure.

Aug 20, 2026

The Bitcoin Way

@Thebitcoinway_

Looking for a #Bitcoin job? 👀 We're hiring! We're looking for a talented Security Engineer to join our technical team and assist in securing our self-hosted infrastructure Come and help us create sovereign individuals 💪 More details in the link below 👇

1:00 PM · Aug 20, 2026

17

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securityfoundingweb3

Founding Engineer

Munari

a16z Speedrun. Reliability infra so robots work in the real world, not just the lab. On-site SF.

San Francisco, US · Aug 18, 2026

just posted a new list of open roles / startups hiring right now feat @rmn & @alanyguo, @advaith_sridhar, @ianbrooke, @jamie_niu, @arthurmensch, @tbc415, @Kalshi, @zipline, @Flock_Safety, & many more thanks @nicoledebow for writing this one with me :)

12:54 PM · Aug 12, 2026

228

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engineeringaifoundingstartup

Founding Engineer

Discovered Materials

$9M to build AI scientists that discover semiconductor materials. a16z Build list.

Aug 18, 2026

just posted a new list of open roles / startups hiring right now feat @rmn & @alanyguo, @advaith_sridhar, @ianbrooke, @jamie_niu, @arthurmensch, @tbc415, @Kalshi, @zipline, @Flock_Safety, & many more thanks @nicoledebow for writing this one with me :)

12:54 PM · Aug 12, 2026

228

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engineeringaifoundingstartup

Founding Engineer

Tenera

a16z Speedrun-backed. Predict how users react to software before you ship. Own agent infra, backend, and frontend.

San Francisco, US · Aug 17, 2026

new list of open roles on the @a16z build newsletter. thanks @thedanigrant for writing this one with me :) feat @shklarski @KexinHuang5 @inferact @OrsakNicole @ValsAI @mjlbach @jgreze @tonydevincenzi @Jackmc and many more full list here: a16zbuild.substack.com/p/open-roles-a…

1:00 AM · Aug 14, 2026

35

Design Leader

Gravity

Invent the design language for human and agentic care. Clinician and patient interfaces. a16z Build list.

New York, US · Aug 17, 2026

new list of open roles on the @a16z build newsletter. thanks @thedanigrant for writing this one with me :) feat @shklarski @KexinHuang5 @inferact @OrsakNicole @ValsAI @mjlbach @jgreze @tonydevincenzi @Jackmc and many more full list here: a16zbuild.substack.com/p/open-roles-a…

1:00 AM · Aug 14, 2026

35

Founding MTS – Infra Engineer

Benchflow

Deeply technical founding infra engineer. Airflow, Medallion, 100TB-scale data. Grind-mindset startup seat.

Aug 15, 2026

Xiangyi Li

@xdotli

apart from this, @benchflow_ai is hiring for deeply technical infra engineer as founding mts if the following sounds familiar to you & you have grind mindset for startups, you probably are a good fit - 100TB - AirFlow - Medallion connect me on linkedin and let's chat!

Xiangyi Li

@xdotli

if you are a startup working on a product related to - devops - ai infra - observability - telemetry - rl / posttraining infra and looking for customer / design partners, i'd love to chat with you! we can pay up to 5-fig for design partnership to help you shape your product

2:49 AM · Aug 15, 2026

25

engineeringaicloudstartupfounding

Founding Engineer

Joey

Founding engineer at an AI dating startup.

Aug 14, 2026

- @cnitschelm (prev spacex) and @trevoroleary (prev tesla) just came out of stealth with $7M for Uplift to rethink how homes get built - @carlymalatskey is hiring a founding engineer for her AI dating startup, Joey - @freialobo & @jackiehluo just came out of stealth with sigil Show more

4:24 PM · Aug 14, 2026

28

engineeringaistartupfounding

Founding Engineer

Sigil

Just came out of stealth. Hiring a founding engineer.

Aug 14, 2026

- @cnitschelm (prev spacex) and @trevoroleary (prev tesla) just came out of stealth with $7M for Uplift to rethink how homes get built - @carlymalatskey is hiring a founding engineer for her AI dating startup, Joey - @freialobo & @jackiehluo just came out of stealth with sigil Show more

4:24 PM · Aug 14, 2026

28

engineeringstartupfounding

Founding Engineer

Cardinal

Founding engineer role.

Aug 14, 2026

- @cnitschelm (prev spacex) and @trevoroleary (prev tesla) just came out of stealth with $7M for Uplift to rethink how homes get built - @carlymalatskey is hiring a founding engineer for her AI dating startup, Joey - @freialobo & @jackiehluo just came out of stealth with sigil Show more

4:24 PM · Aug 14, 2026

28

engineeringstartupfounding

Founding Software Engineer (TypeScript / Node.js)

AI-native recruiting platform

Build the backend for an AI-native recruiting platform. TypeScript, Node.js, NestJS, PostgreSQL, Redis and AI agents. $100k to $200k plus 0.1% to 0.75% equity.

Remote (Worldwide) · Aug 11, 2026

Zamir Khotov

@ZamDeveloper

💼 Hiring Founding Software Engineer (TypeScript / Node.js) | $100K–$200K | Remote Worldwide Build the backend powering an AI-native recruiting platform, designing scalable TypeScript services, APIs, and infrastructure while helping define the architecture of an early-stage Show more

4:10 PM · Aug 11, 2026

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engineeringaistartupfounding