Labelbox
Medium (~350)
Sierra
Large (~500)
Best For
Labelbox
Best for: ML infrastructure engineers building data labeling and training platforms for frontier AI labs and enterprises
Sierra
Best for: Builders who want to work with proven Salesforce and Google leadership on enterprise AI agents
Ratings
LabelboxSierra
3.8
4.0
Overall
3.6
3.5
Work-Life Balance
3.8
4.1
Culture & Values
3.6
4.0
Comp & Benefits
3.5
3.8
Senior Mgmt
3.6
3.8
Career Opps
👍 72% Recommend
👤 78% CEO Approval (Manu Sharma)
👍 80% Recommend
👤 84% CEO Approval (Bret Taylor)
Culture Values
Labelbox only
🌈 Diverse & Inclusive
Sierra only
🌱 Learning & Growth
Shared
⚙️ Engineering-Driven🚀 Ship Fast & Iterate💎 Strong Comp & Equity
Pros & Cons
Labelbox
- Competitive compensation and equity
- Working with top AI labs as customers
- Rapid growth creates organizational churn
- Some teams move faster than others
Sierra
- Elite founders with proven track records
- Strong equity at $10B valuation
- In-person-first culture
- Competitive intensity may not suit everyone
Bottom Line
Labelbox
Choose Labelbox if you want to work on the data side of AI — labeling, evaluation, and training infrastructure used by frontier AI teams — with moderate SF-based intensity.
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.
Open Roles
Labelbox — 9 jobs
💻 Engineering
3
🧠 ML / AI
3
📊 Data
1
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
Summary
Labelbox scores 3.8/5.0 on Glassdoor with a 3.6 work-life balance rating. Sierra scores 4.0/5.0 overall with a 3.5 WLB. That’s a 0.2-point gap on overall satisfaction.
Both companies share these culture values: Engineering-Driven, Ship Fast & Iterate, Strong Comp & Equity. Labelbox also emphasizes Diverse & Inclusive. Sierra also emphasizes Learning & Growth.
On the hiring front, Labelbox has 9 open roles and Sierra has 134 open roles.