In a small company you are likely to:

• Work closely with founding members
• Be teamed with senior engineers & get to leverage off their experience
• Be exposed to product development at close range
• Participate in the full life cycle of a product/service
• Impact the product/service directly
• Relax in a laid-back environment with relatively little bureaucracy, while being energized by a dynamic process

In a large company you are likely to:

• Have a less rigorous time commitment than you would experience in a small company
• Have more opportunities to move around in the organization
• Be exposed to different development methodology
• Have access to a broad base of resources
• Experience more diversity and formal resolution mechanisms