Scale AI
Large (~1,200)
Synthesia
Mid (~660)
Best For
Scale AI
Best for: Ambitious builders who want critical AI infrastructure work serving top-tier clients
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
Ratings
Scale AISynthesia
3.5
4.4
Overall
2.7
4.2
Work-Life Balance
2.9
4.5
Culture & Values
3.5
4.4
Comp & Benefits
2.8
4.2
Senior Mgmt
3.6
4.2
Career Opps
👍 56% Recommend
👤 60% CEO Approval (Alexandr Wang)
👍 88% Recommend
👤 92% CEO Approval (Victor Riparbelli)
Culture Values
Scale AI only
No unique values
Synthesia only
🤝 Flat Hierarchy🧩 Wears Many Hats
Shared
⚙️ Engineering-Driven🎯 Direct Product Impact🌱 Learning & Growth🚀 Ship Fast & Iterate
Pros & Cons
Scale AI
- Building critical AI data infrastructure used by OpenAI, Meta, Microsoft, and the US government
- Strong compensation for engineers — competitive base + equity
- Work-life balance rated 2.7/5 — long hours common during client deadlines
- Culture and values scored 2.9/5 — inconsistent management quality
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
Bottom Line
Scale AI
Choose Scale AI if you want to build data infrastructure for OpenAI and the US government — but expect long hours and inconsistent management.
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.
Open Roles
Scale AI — 174 jobs
💻 Engineering
61
🧠 ML / AI
26
📋 Product
14
💼 Sales / GTM
13
⚙️ Operations
8
⚖️ Legal
6
📣 Marketing
6
📊 Data
3
💰 Finance
2
👤 HR / People
2
🎨 Design
1
🎧 Support
1
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
Summary
Scale AI scores 3.5/5.0 on Glassdoor with a 2.7 work-life balance rating. Synthesia scores 4.4/5.0 overall with a 4.2 WLB. That’s a 0.9-point gap on overall satisfaction.
Both companies share these culture values: Engineering-Driven, Direct Product Impact, Learning & Growth, Ship Fast & Iterate. Synthesia also emphasizes Flat Hierarchy, Wears Many Hats.
On the hiring front, Scale AI has 174 open roles and Synthesia has 71 open roles.