Mercury
Large (~1,300)
OpenAI
Large (~3,500)
Best For
Mercury
Best for: Engineers who want product ownership and fast growth building startup banking infrastructure
OpenAI
Best for: Engineers who want to build frontier AI models at the company defining the industry, with elite compensation
Ratings
MercuryOpenAI
4.3
4.5
Overall
3.8
3.6
Work-Life Balance
3.9
4.6
Culture & Values
4.0
4.5
Comp & Benefits
3.8
4.3
Senior Mgmt
3.9
4.3
Career Opps
👍 79% Recommend
👤 85% CEO Approval (Immad Akhund)
👍 90% Recommend
👤 95% CEO Approval (Sam Altman)
Culture Values
Mercury only
🧩 Wears Many Hats
OpenAI only
No unique values
Shared
🎯 Direct Product Impact⚙️ 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
OpenAI
- Cutting-edge frontier AI research with world-class colleagues
- Elite compensation — top-tier TC and equity packages
- High-intensity environment — long hours and intense pace are the norm
- Internal politics and rapid org changes as the company scales
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.
OpenAI
High-intensity, mission-driven culture with world-class colleagues and top-tier comp — but expect long hours, rapid org changes, and internal politics as the company scales.
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
OpenAI — 655 jobs
💻 Engineering
317
💼 Sales / GTM
57
📋 Product
30
📊 Data
28
🧠 ML / AI
28
📣 Marketing
24
⚙️ Operations
17
⚖️ Legal
13
🎨 Design
10
👤 HR / People
9
💰 Finance
7
🎧 Support
4
Summary
Mercury scores 4.3/5.0 on Glassdoor with a 3.8 work-life balance rating. OpenAI scores 4.5/5.0 overall with a 3.6 WLB. That’s a 0.2-point gap on overall satisfaction.
Both companies share these culture values: Direct Product Impact, Engineering-Driven, Ship Fast & Iterate, Learning & Growth, Strong Comp & Equity. Mercury also emphasizes Wears Many Hats.
On the hiring front, Mercury has 70 open roles and OpenAI has 655 open roles.