Major League Assistant Strength & Conditioning Coach

Seattle Mariners

Peoria, AZ · MLB · Posted October 19, 2026

$75K – $90K /year

Role snapshot

Support Head Strength & Conditioning Coach in delivery of services to Major League Team, create program design models, monitor athlete reports, and collaborate with Athletic Training and field staff.

Department
Sports Medicine & Performance
Seniority
Entry level
Type
Full-Time
Work mode
On-Site

What this job requires

  • ✓CSCS and RSCC certifications
  • ✓Committed professional with strong analytic focus
  • ✓Ability to relate to athletes and generate program buy-in
  • ✓Maximum lifting of up to 100 pounds with frequent lifting of weights up to 50 pounds

Nice to have

  • +Previous experience in high-level baseball setting

One of 95 open Sports Medicine & Performance roles on SportsCareers right now, 46 of them entry level like this one. 20 of the 95 list pay; this one does.

Job description

In order to be considered for this role, after clicking "Apply Now" above and being redirected, you must fully complete the application process on the follow-up screen.

Primary Objective: The Assistant Major League Strength and Conditioning Coach will be an integral part of a dynamic team within a high-performance professional baseball environment. This role involves supporting the Head Major League Strength and Conditioning Coach in delivery of Strength & Conditioning services to the Major League Team. We are seeking a motivated individual who is eager to build strong relationships, foster interdepartmental collaboration, and maintain consistent, effective communication. The ideal candidate will contribute to a culture of progressive thinking and innovation.

Essential Functions:
  • Hold the gym environment to a high standard and in line with current cultural expectations.
  • Create and develop program design models for use in daily preparation, lifting, and conditioning in a professional baseball setting.
  • Assist in the creation and development of player performance screens and assessments.
  • Monitor daily, weekly, and monthly reports from MLB athletes.
  • Communicate with Athletic Training, Rehab, PT staff daily to provide a team first approach.
  • Collaborate with field staff & coordinators to maximize player performance.
  • Assist Director of Player Performance to act as a support system for the S&C coaches for questions and clarifications.
  • Communicate with the Major League S&C Staff to maintain uniformity throughout the organization to provide a seamless transition for all return-to-play athletes under 40-man regulations.
  • Assist in managing budget and financial reporting.
 
Education and Experience:
  • CSCS and RSCC certifications
  • Previous experience in high-level baseball setting (preferred)

Competencies, Knowledge, Skills and Abilities (KSA’s):
  • Must be a committed professional, with strong analytic focus. 
  • Ability to relate to athletes and generate program buy-in.

Physical Activities and Working Conditions:
  • Maximum lifting of up to 100 pounds with frequent lifting of weights up to 50 pounds; typically standing and walking for most of the day
  • Position will require non-traditional work schedule including evenings and weekends.
  • Position may require travel.
  • Position is based out of Peoria, Arizona, and Seattle, Washington.

Compensation Rate/Range:
The anticipated salary range for this role is $75,000-$90,000 annually. The Mariners also provide a robust and unique offering of perks and benefits including paid public transportation, merchandise discounts, special access to baseball games and other public events, and a number of exclusive employee incentives. All perks are subject to eligibility requirements and availability and may be modified or amended from time to time.

We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, sex, sexual orientation, age, disability, gender identity, marital or veteran status, or any other protected class.

Apply Now

Posted by Seattle Mariners. SportsCareers is a job board, not the employer. Applying takes you to their official careers page.

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