Fireworks AI
Small (~100)
OpenAI
Large (~3,500)
Best For
Fireworks AI
Best for: Engineers who want to work with ex-Meta AI infrastructure engineers on LLM inference
OpenAI
Best for: Engineers who want to build frontier AI models at the company defining the industry, with elite compensation
Ratings
Fireworks AIOpenAI
4.2
4.5
Overall
3.3
3.6
Work-Life Balance
4.3
4.6
Culture & Values
4.2
4.5
Comp & Benefits
4.2
4.3
Senior Mgmt
4.0
4.3
Career Opps
👍 90% Recommend
👤 95% CEO Approval (Sam Altman)
Culture Values
Fireworks AI only
🧩 Wears Many Hats🎧 Deep Work / Low Meetings
OpenAI only
🎯 Direct Product Impact💎 Strong Comp & Equity
Shared
⚙️ Engineering-Driven🚀 Ship Fast & Iterate🌱 Learning & Growth
Pros & Cons
Fireworks AI
- World-class team of ex-Meta AI infrastructure engineers — technically very strong peers
- Working on LLM inference optimization which is one of the hottest areas in AI infrastructure
- Early-stage startup intensity with long hours expected and high performance bar
- Small team and rapidly evolving product means less structure, process, and career laddering
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
Fireworks AI
Choose Fireworks AI if you want to work with ex-Meta AI infrastructure engineers on cutting-edge LLM inference — but expect early-stage startup intensity and limited structure.
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
Fireworks AI — 30 jobs
💻 Engineering
9
💼 Sales / GTM
5
📊 Data
1
🎨 Design
1
👤 HR / People
1
📣 Marketing
1
🧠 ML / AI
1
⚙️ Operations
1
📋 Product
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
Fireworks AI scores 4.2/5.0 on Glassdoor with a 3.3 work-life balance rating. OpenAI scores 4.5/5.0 overall with a 3.6 WLB. That’s a 0.3-point gap on overall satisfaction.
Both companies share these culture values: Engineering-Driven, Ship Fast & Iterate, Learning & Growth. Fireworks AI also emphasizes Wears Many Hats, Deep Work / Low Meetings. OpenAI also emphasizes Direct Product Impact, Strong Comp & Equity.
On the hiring front, Fireworks AI has 30 open roles and OpenAI has 655 open roles.