Sierra
Large (~500)
Vast AI
Small (~30)
Best For
Sierra
Best for: Builders who want to work with proven Salesforce and Google leadership on enterprise AI agents
Vast AI
Best for: Scrappy generalists who want a front-row seat to the AI compute revolution
Ratings
SierraVast AI
4.0
5.0
Overall
3.5
3.8
Work-Life Balance
4.1
5.0
Culture & Values
4.0
5.0
Comp & Benefits
3.8
5.0
Senior Mgmt
3.8
5.0
Career Opps
👍 80% Recommend
👤 84% CEO Approval (Bret Taylor)
👍 100% Recommend
👤 100% CEO Approval (Jake Cannell)
Culture Values
Sierra only
🌱 Learning & Growth
Vast AI only
🤝 Flat Hierarchy🧩 Wears Many Hats
Shared
⚙️ Engineering-Driven🚀 Ship Fast & Iterate💎 Strong Comp & Equity
Pros & Cons
Sierra
- Elite founders with proven track records
- Strong equity at $10B valuation
- In-person-first culture
- Competitive intensity may not suit everyone
Vast AI
- Front-row seat to the AI compute revolution — demand for GPU cloud is surging
- Strong compensation and generous equity stakes for a bootstrapped startup
- Processes are still being defined — expect ad hoc workflows
- Intense workload — the team explicitly values high output
Bottom Line
Sierra
Choose Sierra if you want elite founders (Bret Taylor, Clay Bavor) and strong equity at a $10B enterprise AI company — but it's in-person-first and the competitive intensity won't suit everyone.
Vast AI
Choose Vast AI if you want perfect Glassdoor scores and generous equity at a tiny GPU marketplace — but expect startup chaos.
Open Roles
Sierra — 134 jobs
💻 Engineering
42
💼 Sales / GTM
27
📋 Product
15
👤 HR / People
7
🎨 Design
5
⚖️ Legal
5
📣 Marketing
5
⚙️ Operations
5
📊 Data
2
💰 Finance
1
Vast AI — 9 jobs
💻 Engineering
6
🧠 ML / AI
2
Summary
Sierra scores 4.0/5.0 on Glassdoor with a 3.5 work-life balance rating. Vast AI scores 5.0/5.0 overall with a 3.8 WLB. That’s a 1.0-point gap on overall satisfaction.
Both companies share these culture values: Engineering-Driven, Ship Fast & Iterate, Strong Comp & Equity. Sierra also emphasizes Learning & Growth. Vast AI also emphasizes Flat Hierarchy, Wears Many Hats.
On the hiring front, Sierra has 134 open roles and Vast AI has 9 open roles.