Mercury
Large (~1,300)
Sierra
Large (~500)
Best For
Mercury
Best for: Engineers who want product ownership and fast growth building startup banking infrastructure
Sierra
Best for: Builders who want to work with proven Salesforce and Google leadership on enterprise AI agents
Ratings
MercurySierra
4.3
4.0
Overall
3.8
3.5
Work-Life Balance
3.9
4.1
Culture & Values
4.0
4.0
Comp & Benefits
3.8
3.8
Senior Mgmt
3.9
3.8
Career Opps
👍 79% Recommend
👤 85% CEO Approval (Immad Akhund)
👍 80% Recommend
👤 84% CEO Approval (Bret Taylor)
Culture Values
Mercury only
🎯 Direct Product Impact🧩 Wears Many Hats
Sierra only
No unique values
Shared
⚙️ Engineering-Driven🚀 Ship Fast & Iterate🌱 Learning & Growth💎 Strong Comp & Equity
Pros & Cons
Mercury
- Strong talent density with smart, motivated teammates and genuine autonomy and ownership
- Great Place to Work certified — product-first mindset with meaningful scope for every engineer
- Still figuring out how to scale processes — expect some ambiguity and shifting priorities
- Work-life balance rated 3.8/5 — periods of higher intensity during rapid growth phases
Sierra
- Elite founders with proven track records
- Strong equity at $10B valuation
- In-person-first culture
- Competitive intensity may not suit everyone
Bottom Line
Mercury
Choose Mercury if you want product ownership, fast growth, and to build banking infrastructure for startups — but expect growing pains and occasionally intense workloads.
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
Mercury — 70 jobs
💻 Engineering
15
💼 Sales / GTM
13
👤 HR / People
4
📋 Product
4
🎨 Design
3
⚖️ Legal
3
⚙️ Operations
3
📊 Data
2
💰 Finance
2
📣 Marketing
2
🧠 ML / AI
1
🎧 Support
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
Mercury scores 4.3/5.0 on Glassdoor with a 3.8 work-life balance rating. Sierra scores 4.0/5.0 overall with a 3.5 WLB. That’s a 0.3-point gap on overall satisfaction.
Both companies share these culture values: Engineering-Driven, Ship Fast & Iterate, Learning & Growth, Strong Comp & Equity. Mercury also emphasizes Direct Product Impact, Wears Many Hats.
On the hiring front, Mercury has 70 open roles and Sierra has 134 open roles.