---
title: 'Senior AI Frontend Engineer at Sauna'
canonical: 'https://feeny.ai/job/senior-ai-frontend-engineer-sauna-san-francisco-qq6cp10j3cmm'
type: 'job'
last_seen: '2026-09-09'
---

# Senior AI Frontend Engineer at Sauna

- **Company:** Sauna
- **Location:** San Francisco, CA
- **Compensation:** $180k–$240k
- **Employment:** full-time
- **Posted:** 2026-09-04
- **Last confirmed live:** 2026-09-09
- **Apply:** https://jobs.ashbyhq.com/sauna.ai/485cdc13-d4dd-42d3-bd5d-80b62aedac80

## Job description

## ⚠️ PLEASE READ FIRST

- This is a full-time, in-person role based in San Francisco (Presidio) - we work from the office 5 days a week.
- You must be based in the Bay Area or willing to relocate before starting.
- We require US work authorization , but are open to O-1 or J-1 visa sponsorship for exceptional candidates.

## ABOUT SAUNA BY WORDWARE

Every tool you use was built as an island, so you became the glue between them: a name from Gmail into the CRM, a time from the CRM into Calendly, a note from Calendly into a doc. AI showed up and mostly became an eleventh window to paste into.

Sauna is a hybrid of AI and software standing on one shared brain. It holds your context and hands you real software built on top of it, so an ordinary Calendly becomes one that writes the invite itself and knows which of your busy hours bend, and for whom. Software for the path you repeat, AI for the edge that never repeats.

Wordware is the team behind it, 15 people backed by Spark Capital, Felicis, and Y Combinator with a $30M seed, the largest in YC's history. We build from an office in the Presidio, fifty metres from Crissy Field beach, and we work absurdly hard because we can see and feel the outcome every day.

## ABOUT THE ROLE:

You'll own the frontend of Sauna: shipping interfaces that feel instant, intuitive, and polished even when the underlying work is complex.

What You'll Do:

You'll need to make product and design calls yourself, prototype quickly, and execute without waiting for perfect specs. Sometimes you'll implement designs. Other times you'll create them.

Stack: TypeScript, React, Tanstack, Zustand, TailwindCSS, IndexedDB, Cloudflare Workers.

Who You Are:

Minimum:

- 4+ years of frontend engineering with a portfolio of complex web apps you've shipped. We want to see multiplayer experiences, apps handling large data with sophisticated fetching and caching, or work with server-sent events (SSE).
- You love React and deeply understand state management. You know when to useMemo, how callbacks work, the component lifecycle, and you write beautiful, reusable components. You recognize when props are being drilled through multiple layers and should be lifted into context or Zustand instead.
- You're comfortable owning a full-stack feature. You can do the DB migration, write the route in the backend, fetch on the frontend, and create the UI for it.
- Product sense and design intuition: you can take a rough product direction, sketch an interaction, and ship something that feels right.
- You care about performance. You know when to cache, when to refetch stale data, and how to optimistically update the UI. You notice duplicated network requests. You care about the app feeling snappy and responsive.
- You make design decisions: you'll need to own some UX decisions, create simple designs when needed, and unblock yourself.
- High autonomy, low ego: you don't wait for permission or perfect specs. You ship, gather feedback, and iterate.
- You care about craft: details like loading states, empty states, error messages, keyboard shortcuts. The 1000 small decisions that make software feel good.

Bonus (but not required):

- Experience with multiplayer apps (Y.js, Automerge, CRDTs, or similar real-time collaboration frameworks).
- Built interfaces for LLM-based tools (streaming responses, handling uncertainty, progressive disclosure).
- Experience with local-first architectures (IndexedDB, service workers, sync strategies).
- Design background or strong visual sense: you can make things look good without a designer.
- Been a founding frontend engineer and established standards from scratch.

Compensation & Benefits:

Base salary: $180K–$240K + meaningful early-stage equity + health, dental, 401(k), considerable PTO, gym budget, lunch.

## THE PROCESS:

We keep our process simple. Exceptional candidates go from first touch to offer within 2 weeks.

1. Application: Submit your resume and answer a few short questions.
2. 15-minute intro call: Align on location, motivation, and logistics. If it's a go, we move fast from here.
3. System design interview: A deep dive into how you think and architect systems. We'll walk through a real Wordware problem together.
4. Final conversation: We answer your questions and scope out the work trial.
5. Work trial: Paid, in person, usually a few days to two weeks. You work on a real project with us. See how we work, see if it fits, both sides.

## About Sauna

## Company Overview
- **One-liner**: Sauna is building a multiplayer AI agent that learns how you and your team work, remembers everything that matters, and acts on your behalf across thousands of connected tools.
- **Entity Type**: Private (Seed stage)
- **Headquarters**: San Francisco, CA, USA
- **Founded**: Not publicly available
- **Founders**: Not publicly available (company is described as being built by "ex-YC founders")

## Core Business
- Primary industry/industries: Artificial Intelligence, Enterprise Software, Productivity
- Target customers: B2B, teams and knowledge workers
- Mission or purpose statement: To create an AI agent that works as a teammate—running in the background, learning context across sessions, and getting work done even when users are offline.

## Products & Services
- **[Sauna AI Agent]**: A cloud-based AI agent that connects to over 3,000 tools and apps (Linear, GitHub, Notion, Gmail, Google Calendar, Jira, HubSpot, Stripe, etc.). It drafts messages, tracks what matters, files tickets, and delivers briefings. It is "multiplayer"—teammates share a Sauna's context and memory, and individual agents can communicate with each other. Available on web app, iOS, iMessage, Slack, and email.

## Market Standing
- **Valuation/Market Cap**: Not disclosed
- **Key Metric**: Total funding of $30M (largest seed round in YC history)
- **Notable Investors/Partners**: Y Combinator, Spark Capital
- **Growth Signals**: Named "Makers of the #1 Product of All Time on Product Hunt"; launched publicly on April 29, 2025; currently 18 employees; shipping to first paying users; described as building "Cursor for knowledge work"

## Competitive Advantages
- **Multiplayer AI**: Unlike single-user AI assistants, Sauna allows entire teams to share context and memory, and individual agents can communicate peer-to-peer.
- **Always-on Cloud Agent**: Runs 24/7 in the cloud, working even when the user is offline—drafting, tracking, filing, and briefing autonomously.
- **Massive Tool Integration**: Connects to over 3,000 tools and apps, with custom MCP connector support.
- **Record Seed Round**: The largest seed round in YC history signals strong investor confidence and ample runway.

## Strategic Focus
- Current priorities include scaling the agent runtime to handle 1000x current load, building out sandbox infrastructure for secure code execution, and expanding the product to serve more team workflows. The company is hiring heavily across engineering, product, and growth roles to accelerate product-market fit.

## Why Work Here
- **Culture**: Early-stage startup (18 people) with a "ship fast" ethos—one-week sprints, weekly demos, and features going from sketch to launch in days. The company uses its own product daily.
- **Work Policy**: Fully in-office, five days a week at the Presidio in San Francisco. Relocation required for non-local candidates.
- **Compensation**: Competitive base salary ($180K–$240K for Senior Full Stack Engineer), meaningful early-stage equity, health/dental, 401(k), considerable PTO, gym budget, and lunch provided.
- **Engineering Culture**: Work directly with the CTO; own infrastructure decisions that determine system reliability at scale; build real-time streaming, task queues, and multi-model LLM routing.
- **Hiring Process**: Simple and fast—exceptional candidates can go from first touch to offer within 2 weeks. Includes a paid in-person work trial (a few days to two weeks).

## Sources
1. [sauna.ai](https://www.sauna.ai/)
2. [builtin.com - Sauna Jobs](https://builtin.com/company/sauna/jobs)
3. [ainative.careers - Product Manager at Sauna](https://ainative.careers/jobs/sauna-product-manager)
4. [jobs.ashbyhq.com - Growth @ Sauna](https://jobs.ashbyhq.com/sauna.ai/56f92234-3ad1-4eaf-8f95-c53fa15af0a0)
5. [builtin.com - Senior Full Stack Engineer (Back-End)](https://builtin.com/job/senior-full-stack-engineer-back-end/9906576)

## Other roles at Sauna

- [Content Producer](https://feeny.ai/job/content-producer-sauna-san-francisco-q77m1ttavcj4) — San Francisco, CA
- [Founding Growth Marketer](https://feeny.ai/job/founding-growth-marketer-sauna-san-francisco-hqrgcx3bvh48) — San Francisco, CA
- [Applied AI Engineer](https://feeny.ai/job/applied-ai-engineer-sauna-san-francisco-k7rxpcqws9x4) — San Francisco, CA
- [Creative Director / Story Crafter](https://feeny.ai/job/creative-director-story-crafter-sauna-san-francisco-pb529vn4nzcz) — San Francisco, CA
- [Product Designer](https://feeny.ai/job/product-designer-sauna-san-francisco-vyaae9z6w49g) — San Francisco, CA
- [Head of Growth](https://feeny.ai/job/head-of-growth-sauna-san-francisco-ga9n0570xa0a) — San Francisco, CA
- [Designer (Brand and Marketing)](https://feeny.ai/job/designer-brand-and-marketing-sauna-san-francisco-bav9dmhg9h27) — San Francisco, CA
- [Staff Engineer](https://feeny.ai/job/staff-engineer-sauna-san-francisco-21rbhewz8nss) — San Francisco, CA
- [Senior Full Stack Engineer (Back-End)](https://feeny.ai/job/senior-full-stack-engineer-back-end-sauna-san-francisco-xm6ndd6hmd8v) — San Francisco, CA
- [Senior Frontend Engineer](https://feeny.ai/job/senior-frontend-engineer-sauna-san-francisco-v1w8cpfwhga4) — San Francisco, CA