Fireworks AI
Small (~100)
Vast AI
Small (~30)
Best For
Fireworks AI
Best for: Engineers who want to work with ex-Meta AI infrastructure engineers on LLM inference
Vast AI
Best for: Scrappy generalists who want a front-row seat to the AI compute revolution
Ratings
Fireworks AIVast AI
4.2
5.0
Overall
3.3
4.5
Work-Life Balance
4.3
5.0
Culture & Values
4.2
5.0
Comp & Benefits
4.2
5.0
Senior Mgmt
4.0
5.0
Career Opps
👍 100% Recommend
👤 100% CEO Approval (Jake Cannell)
Culture Values
Fireworks AI only
🎧 Deep Work / Low Meetings🌱 Learning & Growth
Vast AI only
🤝 Flat Hierarchy💎 Strong Comp & Equity
Shared
⚙️ Engineering-Driven🚀 Ship Fast & Iterate🧩 Wears Many Hats
Pros & Cons
Fireworks AI
- World-class team of ex-Meta AI infrastructure engineers — technically very strong peers
- Working on LLM inference optimization which is one of the hottest areas in AI infrastructure
- Early-stage startup intensity with long hours expected and high performance bar
- Small team and rapidly evolving product means less structure, process, and career laddering
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
Fireworks AI
Choose Fireworks AI if you want to work with ex-Meta AI infrastructure engineers on cutting-edge LLM inference — but expect early-stage startup intensity and limited structure.
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
Fireworks AI — 28 jobs
💻 Engineering
9
💼 Sales / GTM
4
⚙️ Operations
2
👤 HR / People
1
⚖️ Legal
1
📣 Marketing
1
🧠 ML / AI
1
📋 Product
1
Vast AI — 10 jobs
💻 Engineering
6
🧠 ML / AI
2
📊 Data
1
Summary
Fireworks AI scores 4.2/5.0 on Glassdoor with a 3.3 work-life balance rating. Vast AI scores 5.0/5.0 overall with a 4.5 WLB. That’s a 0.8-point gap on overall satisfaction.
Both companies share these culture values: Engineering-Driven, Ship Fast & Iterate, Wears Many Hats. Fireworks AI also emphasizes Deep Work / Low Meetings, Learning & Growth. Vast AI also emphasizes Flat Hierarchy, Strong Comp & Equity.
On the hiring front, Fireworks AI has 28 open roles and Vast AI has 10 open roles.