About Onyx Corporation

Onyx Corporation is a family-owned construction company based in Acton, Massachusetts, specializing in heavy civil construction, excavation, landscape construction, and construction materials. With a commitment to quality workmanship, safety, and customer satisfaction, Onyx takes pride in delivering projects that make a lasting impact on the communities it serves.

Through its Excavation, Landscape Construction, and Materials divisions, Onyx provides a wide range of services and expertise to support projects throughout the region. Our team combines industry knowledge, skilled employees, modern equipment, and a hands-on approach to get the job done safely and efficiently.

As a family-owned company, Onyx values its people and recognizes that our employees are the foundation of our success. We strive to foster a collaborative, team-oriented work environment where employees are respected, supported, and given opportunities to grow and develop their careers.

At Onyx, we believe in working together, taking pride in what we do, and building a company where people want to work and grow.

Job Description

The Construction Assistant Project Manager supports the Project Manager in planning, coordinating, and delivering heavy civil and private construction projects safely, on schedule, and within budget. This position works closely with Superintendents, Foremen, field crews, owners, engineers, subcontractors, vendors, and internal departments. The ideal candidate has direct experience with excavation, site development, earthwork, grading, drainage, underground utilities, and related heavy civil operations.

Reports to: Project Executive

Essential Responsibilities

• Assist the Project Manager with projects from contract award and turnover through final completion and closeout.
• Review plans, specifications, contracts, scopes of work, geotechnical information, and project requirements.
• Perform quantity takeoffs and help prepare budgets, cost codes, buyout packages, purchase orders, and subcontract agreements.
• Prepare, track, and distribute RFIs, submittals, shop drawings, field directives, change documentation, meeting minutes, and project correspondence.
• Assist with project schedules, short-term look-ahead plans, procurement logs, material deliveries, permitting, utility coordination, and subcontractor activities.
• Coordinate with Superintendents, Foremen, field crews, subcontractors, trucking companies, suppliers, survey, and equipment personnel to support daily operations.
• Track labor, equipment, materials, trucking, subcontractor costs, production quantities, and committed costs against the project budget.
• Review field logs, daily reports, time records, tickets, invoices, and quantity documentation for completeness and accuracy.
• Identify potential changes or extra work, gather supporting information, and assist with pricing, notices, proposals, and change-order tracking.
• Support preparation of payment requisitions, cost reports, forecasts, owner reports, and other project financial documents.
• Visit jobsites regularly to monitor progress, confirm field conditions, coordinate documentation, and help resolve issues before they affect safety, schedule, quality, or cost.
• Communicate professionally with owners, general contractors, engineers, subcontractors, vendors, and internal teams.
• Support project safety and quality requirements and help ensure work complies with plans, specifications, permits, contracts, and company standards.
• Assist with punch lists, as-built drawings, final quantities, releases, warranties, record documents, and project closeout.
• Perform other project-management duties as assigned.

Qualifications

• Three or more years of project-engineering, including direct heavy civil experience.
• Working knowledge of excavation, grading, cut-to-fill earthwork, site development, drainage, underground utilities, dewatering, building pads, paving coordination, and related operations.
• Ability to read and interpret civil plans, profiles, details, specifications, contracts, and survey information.
• Experience with quantity takeoffs, RFIs, submittals, change orders, project schedules, cost tracking, and construction documentation.
• Bachelor’s degree in Construction Management, Civil Engineering, or a related field preferred; equivalent heavy civil construction experience may substitute.
• OSHA 10 or OSHA 30 certification preferred.
• Valid driver’s license and ability to travel regularly to active jobsites.

Required Skills and Abilities

• Strong organizational skills, attention to detail, and ability to manage multiple priorities.
• Clear written and verbal communication with both office and field teams.
• Practical problem-solving skills and the ability to recognize project risks early.
• Understanding of construction costs, production, scheduling, and project documentation.
• Proficiency with Microsoft Office, including Excel, Word, Outlook, and Project.
• Experience with Bluebeam, HCSS, B2W, AGTEK, Sage, or similar construction software preferred.
• Ability to work independently, take initiative, and collaborate in a fast-paced construction environment.

Working Conditions and Physical Requirements

This position includes work in both an office and active construction environment. Regular jobsite visits may involve outdoor weather, uneven terrain, dust, noise, moving equipment, and other normal construction conditions. The employee must be able to safely access active work areas, wear required personal protective equipment, and adjust the work schedule based on project needs.

Why Join Onyx?

At Onyx Corporation, we believe our people are our greatest asset. We offer the opportunity to be part of a team that values hard work, collaboration, safety, and professional growth. Whether you're building your career or bringing years of industry experience, you'll have the opportunity to make a meaningful contribution and be part of something bigger.

Equal Employment Opportunity

Onyx Corporation is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all employees and applicants and do not discriminate based on any legally protected status or characteristic.

Join the Onyx Team!

If you're looking for an opportunity to grow your skills, take pride in your work, and contribute to a team that gets the job done, we'd like to hear from you.