Best X Builds

Founding roles in United States

18 founding jobs in United States that were actually posted on X, not copied from a board. Location is whatever the original post said.

18 roles · updated 2026-10-17

Fluxera

Founding GTM. 100k to 120k plus equity. San Francisco startup and VC networks preferred. Posted by the founder. DM.

San Francisco preferred@Shubham_6x

Noise

Founding designer, onsite in New York. Work trials are paid. Posted by the maker.

New York@lucacs

Engineer

Engineering

Pilgrim Labs

Hardware that engineers, manufactures, and deploys biology. Posted by founding team. Reach out.

United States@MauricioMoel

Engineer

Engineering

Aside

Memory, computer use, compaction, agent loop. $160k to $300k plus equity. SF, in person. Posted by the CEO.

San Francisco, United States@hyojun_at

Founding Marketer

Content / Media

Maverick Intelligence

B2C playbook on B2B AI. Fluent in Claude Code or Codex, talks to camera, has opinions. London or San Francisco. Posted by the CEO.

London, United Kingdom or San Francisco, United States

Chief of Storytelling

Content / Media

Remster

Owns story and growth, not cuts. Weekly GTM experiments, travel BLR and SF. DM a video. Posted by the founder.

Bangalore, India or San Francisco, United States@sumukhanadig8

Creator Growth

Content / Media

X

Founding role on Creators Product. Bring creators to X and grow the ones already there. LA or SF preferred. Posted by Creators Product.

Los Angeles or San Francisco, United States@allegrajacchia

16VC

Fundraising, investing, founders, research. Bengaluru, London, or San Francisco. Email hr@16vc.co. Posted by the GP.

Bengaluru, India / London, UK / San Francisco, US

Andera

AI agents for audit. $37M Series A. San Francisco, on-site. Posted by a teammate at Hack the North.

San Francisco, United States@natashajchen

Shorebird

Founding engineer at a small Flutter tooling team. Posted by a teammate.

Remote, United States@AbhishekDoshi26

Marble

Founding engineer, in person in NYC. YC S26, restaurant back-of-house AI. Posted by a co-founder.

New York, NY@arjunjchaliha

Sugar

Founding engineer in NYC. Equity plus competitive comp, $10k referral. Posted by the founder.

New York, NY@lukaivicev

Sixtyfour

Founding growth for agents that do enterprise research. SF in person. $120k to $150k plus equity. Posted by the CEO.

San Francisco, US@saarth_

Munari

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

San Francisco, US@katieschwartz

Tenera

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

San Francisco, US@katieschwartz

Gravity

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

New York, US@katieschwartz