According to Amazon's public salary data, the average annual salary of employees at Amazon headquarters in Seattle is about $150,000. In addition, Amazon also provides generous benefits and employee welfare programs, such as medical insurance, retirement pensions, stock awards, etc. In addition, Amazon also provides flexible working hours and work location options, as well as career development opportunities and training programs. In general, Amazon is an employer that provides good treatment and benefits. According to Amazon's official website, employee benefits at the Seattle headquarters include:

1. Competitive salary and benefits: Amazon offers competitive salary and benefits programs, including medical, dental and vision insurance, 401(k) plans, paid vacations, etc.

2. Career development opportunities: Amazon offers a wide range of career development opportunities, including internal training, career development programs and leadership courses.

3. Advanced work environment: Amazon provides an advanced work environment, including modern workplaces, flexible work hours, fitness facilities and employee restaurants.

4. Cultural diversity: Amazon is committed to creating a diverse and inclusive work environment to attract and retain the best talent.

Overall, Amazon provides employees with generous benefits and career development opportunities at its Seattle headquarters to attract and retain the best talent.