Synthesia
Mid (~660)
Vast AI
Small (~30)
Best For
Synthesia
Best for: Engineers who want to build cutting-edge generative AI video at a fast-scaling London unicorn with a genuinely low-ego culture
Vast AI
Best for: Scrappy generalists who want a front-row seat to the AI compute revolution
Ratings
SynthesiaVast AI
4.4
5.0
Overall
4.2
4.5
Work-Life Balance
4.5
5.0
Culture & Values
4.4
5.0
Comp & Benefits
4.2
5.0
Senior Mgmt
4.2
5.0
Career Opps
👍 88% Recommend
👤 92% CEO Approval (Victor Riparbelli)
👍 100% Recommend
👤 100% CEO Approval (Jake Cannell)
Culture Values
Synthesia only
🌱 Learning & Growth🎯 Direct Product Impact
Vast AI only
💎 Strong Comp & Equity
Shared
🚀 Ship Fast & Iterate🤝 Flat Hierarchy⚙️ Engineering-Driven🧩 Wears Many Hats
Pros & Cons
Synthesia
- Low-ego supportive culture with genuine trust and ownership
- Fast-paced growth with real opportunity to develop and lead
- R&D and Product teams feel intense pressure and WLB suffers
- Promotions rare internally — new roles favor external hires
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
Synthesia
High-growth AI company with strong culture ratings and real employee trust, though R&D teams feel the pace and promotions skew toward external hires.
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
Synthesia — 71 jobs
💼 Sales / GTM
25
🎨 Design
9
💻 Engineering
9
🧠 ML / AI
5
📣 Marketing
3
🎧 Support
3
📊 Data
2
👤 HR / People
1
⚖️ Legal
1
⚙️ Operations
1
📋 Product
1
Vast AI — 10 jobs
💻 Engineering
6
🧠 ML / AI
2
📊 Data
1
Summary
Synthesia scores 4.4/5.0 on Glassdoor with a 4.2 work-life balance rating. Vast AI scores 5.0/5.0 overall with a 4.5 WLB. That’s a 0.6-point gap on overall satisfaction.
Both companies share these culture values: Ship Fast & Iterate, Flat Hierarchy, Engineering-Driven, Wears Many Hats. Synthesia also emphasizes Learning & Growth, Direct Product Impact. Vast AI also emphasizes Strong Comp & Equity.
On the hiring front, Synthesia has 71 open roles and Vast AI has 10 open roles.