Project Administrative Assistant- Energy Storage
Mortenson
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Denver, CO · Posted November 11, 2026
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About the job
ESS Project Administrative Assistant
SUMMARY
Mortenson is currently seeking a Project Admin to join our Energy Storage Group with the ability to work well with a variety of staff at all levels in an ever-changing environment, remaining flexible, inventive, enthusiastic, and efficient with a high level of integrity and confidentiality. As a Project Administrative Assistant, you are at the heart of the business operations and activities and the soul that keeps your team moving forward. You will be handling a wide range of administrative and executive support tasks with an aptitude for working independently or with little supervision. You move quickly with the changing environment and are up to date with the latest software and services. You also use that knowledge to strategically support your team's projects.
Must be willing to work 100% onsite at project locations throughout the United States, with travel to future project locations as business needs require.
RESPONSIBILITIES
Organization and flexibility are critical in performing duties which include, but are not limited to:
Provide administrative and operational clerical support to the department or staff
Handle incoming calls and providing general information, forward calls to the appropriate party and take messages as required
File and maintain written records along with crafting electronic copies for records
Receive, sort and record deliveries into computer database
Prepare daily outbound deliveries
Prepare materials for design and construction meetings
Record and update meeting minutes for the various site meetings
Responsible for procurement of consumable materials and office supplies
Assist Superintendent with equipment inventory tracking and organization
Support Superintendent with the entry of craft worker timecards
General support for the project team as needed with various day to day tasks
Schedule, track and log all repairs and standard maintenance for the work trucks
Provide maps and directions to any visitors, subcontractors, deliveries, or new employees
Log all applicants into the Craft Applicant Tracking Spreadsheet
QUALIFICATIONS
Associate’s degree in Business or related administrative experience preferred.
Bilingual proficiency in English and Spanish is highly preferred.
Three years administrative experience, preferably supporting a large number of team members
Proficiency in Microsoft Office suite, including Excel, Email and Calendar systems, and PowerPoint
Detail oriented, with excellent problem-solving skills, meticulous, upbeat, adept at succeeding in rapidly changing environment
Strong communication skills with high degree of integrity in both written and verbal communications
A few benefits offered include:
(for Non-Craft & Non-Union Craft working 25+ hours / week)
Medical and prescription drug plans that includes no additional cost vision coverage
Dental plan
401k retirement plan with a generous Mortenson match
Paid time off, holidays, and other paid leaves
Employer paid Life, AD&D, and disability insurance
No-Cost mental health tool and concierge with extensive work-life resources
Tuition reimbursement
Adoption Assistance
Gym Membership Discount Program
The base pay range for this role is $24.52MIN - $33.12MAX. (Actual range is higher for the following office locations: Denver, CO and Chicago, IL – 5%, Seattle, WA, and Portland, OR – 10%, Washington, D.C. – 12.5%).
Base pay is positioned within the range based on several factors including an individual’s knowledge, skills, and experience, with consideration given to internal equity.
#LI-LS1 #LI- >
Please make note:
Visa sponsorship is not offered for this position.
Our postings are typically open a minimum of 5 days and an average of 44 days.
ABOUT MORTENSON
As a top builder, developer, and EPC (Engineering, Procurement, and Construction), our expertise spans markets like sports, renewable energy, data centers, healthcare, and more. We are builders at heart, working to ensure the built environment has a lasting positive impact.
Let’s Redefine Possible®
Equal Employment Opportunity
Your uniqueness brings new and creative perspectives to the team. Mortenson is committed to providing equal opportunities of employment (EOE) to all individuals, regardless of your race, religion, gender, national origin, age, veteran status, disability, marital status or any other legally protected category.
Other Items to Note
Mortenson reserves the right to hire any individual without legal or financial obligation on unwanted solicitations. No agency emails, calls, or solicitations are accepted without a valid agreement.
Must be currently legally authorized to work in the U.S. without sponsorship for employment visa status (e.g., H1B status, 0-1, TN, CPT, OPT, etc.). We are unable to sponsor or take over sponsorship of an employment Visa at this time.