Human Resource Generalist - Oklahoma City, OK @ Mullins Mechanical

HR Generalist Job Responsibilities and Requirements

Mullins Mechanical is a leader in industrial and large commercial mechanical, plumbing, HVAC construction projects. Our projects are often in the industrial and manufacturing environments, such as manufacturing facilities, automotive plants, chemical plants, distribution centers, warehouses, and other large commercial facilities.  We are a self-performing specialty contractor specializing in design-build applications, HVAC systems, plumbing, process piping systems, boiler and chiller systems, equipment installation and rigging, plant relocation and maintenance, and metal fabrication. 

In this role, you will help shape the employee experience from onboarding through offboarding, strengthen team engagement, support day‑to‑day HR operations, reinforce compliance, and contribute to a culture where employees feel valued and supported. Working closely with OpCo leadership and the Divisional HR Manager, you will play a meaningful part in ensuring our HR function is responsive, thoughtful, and aligned with the needs of the business. This role will support multiple different business units around the Phoenix area and will be required to spend time at each location.

Key Responsibilities

Employee Relations & Support

• Serve as a trusted resource for employees at all levels, providing guidance on workplace concerns, HR policies, and procedures.
• Support supervisors with performance conversations, documentation, coaching, and conflict resolution.
• Maintain the highest level of confidentiality and professionalism.

Benefits, Leave & HR Administration

• Assist employees with benefits questions, enrollment changes, and 401(k) inquiries.
• Support FMLA, ADA, short‑term disability, workers’ compensation, and return‑to‑work processes.
• Maintain accurate HRIS data and confidential personnel files.

Onboarding & Employee Experience

• Facilitate a welcoming and structured onboarding process.
• Coordinate pre‑employment requirements, new hire documentation, and orientation.
• Support appreciation events and employee engagement initiatives.

 

Offboarding & Transition Support

• Coordinate exit steps, documentation, equipment collection, and system access removal.
• Conduct exit interviews and share insights for retention and manager coaching.
• Ensure offboarding is completed with professionalism, empathy, and accuracy.

Training & Leadership Support

• Create and present HR‑related training for managers.
• Coordinate additional development opportunities and track completions.
• Partner with leadership to identify workforce needs and mitigate HR-related risks.
• Track and report on key HR metrics (turnover, onboarding completion, compliance deadlines, engagement, etc.) to support decision-making.

Compliance & Policy Management

• Ensure compliance with federal, state, and local employment laws.
• Support handbook updates and HR procedure improvements.
• Assist with audits, reporting, and data analysis.
• Partner with operations and safety leadership to support OSHA compliance, safety training tracking, incident documentation, and workers’ compensation processes as needed.
• Be a champion for safety standards and protocols by holding self, leaders and field employees to the highest standards. 

Qualifications

• Bachelor’s degree in HR, Business, or related field, or equivalent experience.

• 3–5 years of progressive HR experience; construction or field-service industry experience preferred.
• Strong knowledge of federal and state employment laws (FMLA, ADA, FLSA, etc.).
• Experience with employee relations, recruiting, and HR administration.

• Demonstrated ability to build and implement scalable HR processes in a fast-paced, field-based environment, balancing structure with flexibility and effective change management.

• Excellent interpersonal, communication, and problem-solving skills.
• PHR or SHRM-CP certification preferred (not required).

 

Work Environment & Physical Expectations

• Primarily office‑based between multiple locations with occasional jobsite visits.
• Ability to sit/stand for extended periods; occasional lifting of 20–25 lbs.