Aside from high pay and competitive perks offered to attract talent, companies that provide regular feedback, advancement, and mentorship programs are better able to keep younger workers.

So where are the employers who support promotion from within? Based on company review surveys, career site Glassdoor.com put together a list of the top 25 companies that provide the best career opportunities.

"When employees share a company review on Glassdoor, we ask them to rate several workplace factors, including how they believe their employer is when it comes to offering career opportunities," says Scott Dobroski, a spokesman for Glassdoor. "If career advancement and growth opportunities are important for a job seeker, this rating provides insight into what employees have to say about the career opportunities at a specific employer."

Many companies that made it on last year's list, such as Bain & Company, Edelman, and CareerBuilder, reappeared on this year's list. Newcomers this year include Fluor, Chevron, and the Four Seasons Hotels and Resorts.

To break any ties, Glassdoor calculated ratings to the thousandth decimal. Company ratings are based on a 5.0 scale, with 5 being the best possible score.

25. Fluor

Career opportunities rating: 3.9

What employees think:

"High priority is placed on employee development. A great place to work if you are a self motivated individual. If not, also a great place to work. Lots of resources for development whether it is technical or non technical. Lots of opportunity to advance your career." —  Fluor Process/Specialty Engineer III (Houston, TX)

Source: Glassdoor



24. Chevron

Career opportunities rating: 3.7

What employees think:

"Plenty of room to advance and apply for jobs internally rather than look outside. 9/80 work schedules with great bonus plan and annual salary raises." — Chevron Drilling IT Professional (Houston, TX)

Source: Glassdoor



23. H-E-B

Career opportunities rating: 3.7

What employees think:

"They train you for management positions. The pay and flexibility. The opportunity to transfer anywhere throughout Texas and the U.S." – H-E-B Deli Associate (Missouri City, TX)

Source: Glassdoor



22. General Electric

Career opportunities rating: 3.7

What employees think:

"The company is very willing to send you to training classes that target the career goals you have in mind. You will most likely get Six Sigma and Leadership training within the first 1 to 2 years of being on the job." – GE Software Distribution and Asset Management Engineer (Cincinnati, OH)

Source: Glassdoor



21. Procter & Gamble

Career opportunities rating: 3.7

What employees think:

"Huge investment in people development. Great variety of assignments, products, geographies. Great values — you are treated right." — Procter & Gamble Brand Manager (location n/a)

Source: Glassdoor



20. L&T

Career opportunities rating: 3.7

What employees think:

"Invaluable training and exposure to the best practices, reasonably good pay, and best facilities provided. Growth can be quick if you can take up challenges and prove yourself." — L&T Assistant Manager (Rajahmundry, India)

Source: Glassdoor



19. Gartner

Career opportunities rating: 3.7

What employees think:

"The training provided is next to none and gives new employees the tools to hit the ground running. Coming from a larger corporation, the culture here is a breath of fresh air. Everyone is ambitious and smart with a drive to do more." – Gartner Account Executive (Fort Myers, FL)

Source: Glassdoor



18. Synygy

Career opportunities rating: 3.7

What employees think:

"Great mentorship program, really helpful especially for new employees; unique work environment, with events and values that you won't find anywhere else." – Synygy Employee (location n/a)

Source: Glassdoor



17. Northwestern Mutual

Career opportunities rating: 3.8

What employees think:

"You will learn how to build your book of business. You will learn how to manage your time for maximum efficiency and productivity. You will choose who you want to do business with." — Northwestern Mutual Financial Representative (West Palm Beach, FL)

Source: Glassdoor



16. Eaton

Career opportunities rating: 3.8

What employees think:

"Opportunities: being large and diverse, there is always room for lateral or vertical moves, regardless of the economy. If you are talented, you'll have a job here." — Eaton Leadership Development Program Employee (Beltsville, MD)

Source: Glassdoor



15. Deloitte

Career opportunities rating: 3.8

What employees think:

"Opportunities to lead teams very early in your career. Ever-changing environment so flexibility is a must!" — Deloitte Employee (San Francisco, CA)

Source: Glassdoor



14. Ernst & Young

Career opportunities rating: 3.8

What employees think:

"Great place to start your career. Organized training program and onboarding process. The company talks the talk and walks the walk when it comes to people first culture with flexibility and mobility." — Ernst & Young Employee (Chicago, IL)

Source: Glassdoor



13. Cameron International

Career opportunities rating: 3.8

What employees think:

"They are focused on the employees career and give plenty of opportunity for growth. Management understands that every employee has career goals and Cameron is not one to stand in the way of those goals." — Cameron International Engineer II (Houston, TX)

Source: Glassdoor



12. UniFirst

Career opportunities rating: 3.8

What employees think:

"Achievements and hard work acknowledged. Upward and lateral mobility. My opinion matters and my work ethic is matched by upper management." — UniFirst Regional Sales Manager (Orlando, FL)

Source: Glassdoor



11. CareerBuilder

Career opportunities rating: 3.9

What employees think:

"A great learning environment, management that actually cares and shares in your career growth strategies, outstanding benefits and perks." – CareerBuilder Client Support Specialist (Norcross, GA)

Source: Glassdoor



10. PwC

Career opportunities rating: 3.9

What employees think:

"If you like variety, PwC is the place to be. You have a great number of opportunities in both audit and advisory roles, and if you challenge yourself, you can grow your career here." — PwC Audit Associate (San Jose, CA)

Source: Glassdoor



9. Schlumberger

Career opportunities rating: 3.9

What employees think:

"Unlimited career opportunities, working in a nice, multicultural environment with some very awesome people, opportunity to see the world." — Schlumberger Field Engineer (location n/a)

Source: Glassdoor



8. Four Seasons

Career opportunities rating: 4.0

What employees think:

"This company always lends an opportunity for development and very willing to let you try new things you'd never otherwise get to in other companies." – Four Seasons Hotels Director (Toronto, ON, Canada)

Source: Glassdoor



7. Suncor

Career opportunities rating: 4.0

What employees think:

"Limitless opportunities to learn and tremendous leverage to define one's role and grow in one's career. This does not mean only promotion in ranks/titles necessarily, but the personal journey to become the best or indispensable in one's chosen field." — Suncor Project Manager (Calgary, AB, Canada) 

Source: Glassdoor



6. Booz & Company

Career opportunities rating: 4.0

What employees think:

"Top-notch people, access to the best leaders in industry, ability to be very entrepreneurial, willingness to advance early on performance, deep functional expertise in addition to superstar MBAs." — Booz & Company Principal (location n/a)

Source: Glassdoor



5. Edelman

Career opportunities rating: 4.1

What employees think:

"Plentiful opportunities to develop and build a career, large global network with many practice areas, high quality of work." — Edelman Vice President (San Mateo, CA)

Source: Glassdoor



4. Guidewire

Career opportunities rating: 4.4

What employees think:

"Great bosses who support you - opportunity. A supportive environment where you can push the envelope and if you fail, it is a learning opportunity, but you pushed the limits." — Guidewire Worldwide Recruitment Business Partner (Foster City, CA)

Source: Glassdoor



3. McKinsey & Company

Career opportunities rating: 4.5

What employees think:

"Amazing training in all the core business functions. Broad exposure to different companies, industries, and functional areas." — McKinsey & Company Business Analyst (location n/a)

Source: Glassdoor



2. Boston Consulting Group

Career opportunities rating: 4.5

What employees think:

"Very strong training program: analytics, presenting, slide writing, managing client relationships. Consistent, 360 feedback culture. Typical 2-year track to move to next level." —Boston Consulting Group Principal (location n/a)

Source: Glassdoor



1. Bain & Company

Career opportunities rating: 4.5

What employees think:

"Lots of effort put into personal development and growth. People really care about you, and the atmosphere is more collaborative than competitive." — Bain & Company Consultant (Chicago, IL)

Source: Glassdoor



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