Gym Class  Is Hiring Character Animation Engineering Lead

### Stop building GPT wrappers. Build a world model instead.---*Why Foundry exists:*Every SaaS app, enterprise tool, and internal workflow without an API will soon be automated by browser agents—not traditional API integrations. Tens of trillions of dollars in global labor depend on browser-based workflows that no AI system can reliably automate today.But browser agents right now are like GPT-1: impressive demos, but brittle and broken in practice. To scale browser agents from GPT-1 demos to GPT-4 reliability—and unlock this enormous economic leap—they need purpose-built infrastructure:- *Realistic web simulation*: capable of modeling complex tasks, ambiguous UIs, and non-deterministic interactions.
- *Robust RL training loops*: that learn effectively from sparse rewards and authentic user behavior.
- *Rigorous evaluation benchmarks*: tied to real-world outcomes and genuine business impact.No one&#x27;s built it yet. We&#x27;re going first.We’re building exactly this—core infrastructure designed from first principles, specifically for browser agents. No incremental tools, no wrappers around GPT—just the foundational AI stack everyone else will depend on later.Our founding team is ex-Scale AI &amp; MetaSeed-funded, SF-based (fully in-person)---*What we’re looking for:*A founding engineer who’s cracked at software engineering—but who now wants to ship core ML systems and RL infrastructure from scratch.This is not another prompt-engineering job.*You’ll:*- Build a browser agent gym—sparse rewards, non-determinism, messy DOM trees.
- Solve hard ML problems at the edge of production—every single day.---*You probably:*- Are a killer engineer (Python, TypeScript) early in your career (0–2 YOE).
- Ship insanely fast—internships, side projects, OSS, real research—things you’ve built yourself.
- Have real ML exposure: trained models, built infra, ran experiments.
- Have strong OSS contributions, publications we’d recognize, or both.
- Want a grind. Want to get better. Want to build something genuinely novel.---*Bonus points:*- You’ve built RL agents, browser automation (Puppeteer, Playwright), or eval tooling.
- You’re tired of wrapping APIs and fine-tuning HuggingFace models—ready to do something deeper.---*Why join:*- Real-world ML infrastructure, real users, real technical complexity.
- Early equity, competitive pay, and massive growth trajectory.
- SF-based, 5 days&#x2F;week, fully in-person.We&#x27;re building core infra. The ML stack everyone else will use later—that’s what we’re shipping today.---If you’ve read this far, you probably get it.Reach out directly—let’s build.<a href="https:&#x2F;&#x2F;www.ycombinator.com&#x2F;companies&#x2F;foundry&#x2F;jobs&#x2F;uwi8b6I-founding-engineer-ml-x-swe">https:&#x2F;&#x2F;www.ycombinator.com&#x2F;companies&#x2F;foundry&#x2F;jobs&#x2F;uwi8b6I-f...</a>Email at manil @ foundryrl dot com

Foundry  is hiring – Come build a world model for the web

Bild AI  is hiring a founding engineer in SF

Tenjin  Is Hiring a Senior Ad Attribution Engineer (Ruby, Go)

Onyx  Is Hiring for ML Engineer

Recover  Is Hiring

GiveCampus  Is Hiring Sr engineers passionate about education

Cekura (Formerly Vocera)  Is Hiring

Spark AI  is hiring a full-stack engineer in San Francisco

FurtherAI  Is Hiring Software and AI Engineers

Weave  is hiring a founding engineer

Infisical  Is Hiring Design Engineer in San Francisco

Dot  is hiring a sales engineer to automate analytics (fully remote)

Mux  is hiring engineering managers for video at scale

EasyPost  Is Hiring

Tesorio  Is Hiring a Senior Back End Engineer in Latam (100% Remote)

Formance  Is Hiring Engineers to Build OSS Financial Infrastructure

OneSignal  Is Hiring Engineers

Hive.co  Is Hiring a Head of Engineering

Streak  is hiring Staff Engineers for local first, high perf front ends

Flexport  is hiring software engineers

Typewise  Is Hiring an ML Engineer (Zurich, Switzerland)

KaiPod Learning  Is Hiring a PM

Artie  Is Hiring Engineer #3

Instant  Is Hiring a Founding TypeScript Engineer

Mosaic  is building a general purpose agent for video editing

Roame  Is Hiring: Founding Product Designer

MediSearch  Is Hiring a Founding Engineer in Central Europe

Parity  is hiring founding engineers to build an AI SRE (in-person SF)

Legion Health  is hiring engineers to rebuild psychiatry with AI

Telli  is hiring founding engineers in Berlin, Germany (on-site)

posted by	title	time	batch	link
hackerews	Gym Class Is Hiring Character Animation Engineering Lead	Gym Class Is Hiring Character Animation Engineering Lead	7 hours ago	W22
lakabimanil	Foundry is hiring – Come build a world model for the web	Foundry is hiring – Come build a world model for the web	11 hours ago	F24
rooppal	Bild AI is hiring a founding engineer in SF	Bild AI is hiring a founding engineer in SF	a day ago	W25
amirmanji	Tenjin Is Hiring a Senior Ad Attribution Engineer (Ruby, Go)	Tenjin Is Hiring a Senior Ad Attribution Engineer (Ruby, Go)	2 days ago	S14
yuhongsun	Onyx Is Hiring for ML Engineer	Onyx Is Hiring for ML Engineer	3 days ago	W24
nickgulino1	Recover Is Hiring	Recover Is Hiring	3 days ago	W21
mkong1	GiveCampus Is Hiring Sr engineers passionate about education	GiveCampus Is Hiring Sr engineers passionate about education	4 days ago	S15
atarus	Cekura (Formerly Vocera) Is Hiring	Cekura (Formerly Vocera) Is Hiring	4 days ago	F24
tk90	Spark AI is hiring a full-stack engineer in San Francisco	Spark AI is hiring a full-stack engineer in San Francisco	4 days ago	W24
sgondala_ycapp	FurtherAI Is Hiring Software and AI Engineers	FurtherAI Is Hiring Software and AI Engineers	5 days ago	W24

YC Job Board

Making your job search easier