Job stories

Gym Class by IRL Studios is seeking a Gameplay Animation Engineer to join their team. The successful candidate will be responsible for creating engaging animations and physics-driven movement to enhance the user experience in the company's virtual fitness platform.

### Stop building GPT wrappers. Build a world model instead.

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*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's built it yet. We'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 & Meta

Seed-funded, SF-based (fully in-person)

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*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.

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*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.

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*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.

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*Why join:*

- Real-world ML infrastructure, real users, real technical complexity. - Early equity, competitive pay, and massive growth trajectory. - SF-based, 5 days/week, fully in-person.

We're building core infra. The ML stack everyone else will use later—that’s what we’re shipping today.

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If you’ve read this far, you probably get it.

Reach out directly—let’s build.

https://www.ycombinator.com/companies/foundry/jobs/uwi8b6I-f...

Email at manil @ foundryrl dot com

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Tenjin, a leading mobile marketing analytics platform, is seeking a Senior Backend Engineer to join their team. The role involves building scalable and reliable systems to power Tenjin's data-driven ad attribution services.

Onyx, a Y Combinator-backed company, is seeking a Machine Learning Engineer to help develop and improve its machine learning models and systems. The ideal candidate should have strong expertise in machine learning, data analysis, and software engineering.

Recover, a Y Combinator-backed company, is seeking a Head of Finance to manage financial operations, reporting, and strategic decision-making. The successful candidate will have experience in financial planning, analysis, and leading a finance team within a fast-paced, high-growth startup environment.

Cekura, a YC-backed startup, is seeking a Founding Engineer to help build a platform that empowers individuals to take control of their personal data and digital identity. The role involves developing secure data infrastructure, creating user-friendly tools, and shaping the technical vision for the company.

Spark, a YC-backed startup, is seeking a full-stack software engineer to join their team. The role involves building and improving Spark's platform, which helps developers get their ideas to market faster.

Further.ai is a startup that provides AI-powered solutions for businesses. The company is currently hiring for various roles, including software engineers, data scientists, and product managers.

Weave is a software company that provides communication and relationship management tools for small businesses. They are hiring for various engineering and product roles to expand their team and continue developing their platform.

Infisical, a Y Combinator-backed startup, is seeking a Design Engineer to join their team in San Francisco. The role involves designing and developing innovative products that improve data security and privacy for businesses and individuals.

Dot, a YC-backed startup, is seeking a Customer Success Sales Engineer to join their remote team. The role involves providing technical support, troubleshooting, and educating customers on the company's product.

Mux, a video infrastructure company, is hiring for various positions including software engineers, data scientists, and product managers. The article provides information about the company, its mission, and the available job openings.

EasyPost is a technology company that provides shipping and logistics solutions for businesses. The website outlines the company's various job openings, including roles in engineering, product, sales, and operations.

Tesorio, a financial automation startup, is actively hiring for multiple positions, including software engineers, product managers, and customer success representatives, to join their growing team and help build solutions that improve cash flow management for businesses.

Formance, a Y Combinator-backed startup, is seeking talented individuals to join their team. The company focuses on developing innovative financial software and is currently hiring for various positions, including engineering, product, and business roles.

OneSignal is a leading push notification platform that helps businesses engage with their customers across multiple channels. The company is hiring for various roles, including engineering, product management, sales, and more, to continue growing its innovative solutions.

Streak, a customer relationship management (CRM) company, is seeking a Staff UI Engineer to join their team. The role involves designing and developing user interfaces for Streak's web-based application, collaborating with cross-functional teams, and contributing to the overall engineering efforts.

Flexport is a technology-driven freight forwarding and customs brokerage company that aims to modernize global trade through its digital platform, offering end-to-end supply chain solutions and data-driven insights to help businesses streamline their logistics operations.

Typewise, a secure mobile keyboard app, is seeking a Machine Learning Engineer to join their team. The role involves developing and improving the app's machine learning models for text prediction, autocorrect, and language understanding.

Kaipod Learning, a YC-backed company, is seeking a Senior Product Manager to help shape the future of their AI-powered learning platform. The ideal candidate will have a strong background in product management, a passion for edtech, and the ability to drive innovation and growth.

Artie, a YC-backed startup, is seeking a Founding Product Engineer to help build their AI-powered creative platform. The ideal candidate will have experience in full-stack web development, machine learning, and a passion for creating innovative products.

The article discusses the skills and qualifications needed to become a TypeScript hacker, including experience with JavaScript, familiarity with TypeScript, and proficiency in software engineering principles and practices.

Mosaic, a YC-backed startup, is seeking a Founding Engineer to play a key role in building its core technology and infrastructure. The ideal candidate will have strong technical skills and the ability to work in a fast-paced, collaborative environment to help shape Mosaic's future products and services.

Roame, a Y Combinator-backed startup, is seeking a Founding Product Designer to help shape the company's products and user experience. The role involves designing innovative solutions, collaborating with the team, and contributing to the overall product strategy.

Medisearch, a Y Combinator-backed company, is seeking a founding full-stack engineer to join their team. The engineer will play a crucial role in building the company's core product and contributing to its overall technical strategy and development.

Parity is a blockchain infrastructure company that provides developers with tools and services to build decentralized applications. The company is currently hiring for various roles, including blockchain engineers, product managers, and technical writers.

Legion Health, a YC S21 startup, is seeking a Founding Engineer to build AI-driven operations for their mental health platform. The role involves developing automated workflows and leveraging data to optimize their clinical operations.