Mullins Mechanical is a leader in industrial and large commercial mechanical, plumbing, and HVAC construction projects across manufacturing facilities, automotive plants, chemical processing sites, data centers, warehouses, and other complex industrial environments. As a self-performing specialty contractor, we deliver excellence in design-build solutions, process and utility piping, HVAC systems, plumbing, equipment installation and rigging, metal fabrication, plant maintenance, and relocation. As our organization continues to scale, we are evolving our Human Resources function to support a more complex, multi-layered business.

We are seeking a strategic and execution-focused Director of Human Resources to serve as a true business partner for executive and operational leadership. This role will operate as a player/coach, leading the HR function while directly shaping organizational strategy, workforce design, and leadership capability. This leader will bring experience supporting and scaling multi-layered organizations, with the ability to design and build effective teams, lead organizational design and development efforts, and deliver a forward-looking HR strategy that enables growth.

This role will site on the Mullins leadership team at our headquarters in Carrollton and will report to the Corporate HR Director of Kelso Industries, ensuring alignment with both Mullins executives and enterprise HR strategy and standards.

Key Responsibilities

Strategic HR & Business Partnership Partner with executive leadership to define and execute a comprehensive HR strategy aligned to business growth, operational complexity, and long-term objectives Act as a trusted advisor to senior leaders, influencing decision-making across workforce planning, organizational design, and leadership effectiveness Lead site design efforts, including structuring multi-layered teams, clarifying roles and spans/layers, and enabling scalable growth Translate business strategy into actionable talent plans, ensuring the organization has the leadership, structure, and capability to execute HR Leadership & Team Development Lead, develop, and scale the Mullins HR function, establishing a high-performing team and service delivery model Operate as a player/coach by balancing hands-on execution with strategic leadership and capability building Establish clear priorities, operating rhythms, and performance expectations across the HR team Talent, Culture & Organizational Development Design/implement scalable programs across performance management, leadership development, succession planning, and career pathing Build leadership capability at all levels through coaching, tools, and structured development programs Champion a culture of accountability, safety, teamwork, and continuous improvement aligned with field and operational environments Lead employee engagement and organizational effectiveness initiatives that strengthen retention and performance Employee Relations & Leadership Coaching Provide executive-level guidance on complex employee relations matters, investigations, and risk mitigation Coach leaders to effectively manage performance, conflict, and team dynamics Ensure consistent, fair, and values-aligned application of policies and practices across the organization Compliance & HR Operations Ensure full compliance with federal, state, and local employment laws (ADA, FMLA, FLSA, I-9, EEO, COBRA, USERRA, workers’

Compensation

) Be a champion of corporate HR Operation initiatives for Mullins Mechanical.

Qualifications

10+ years of progressive HR experience, including senior leadership roles with enterprise or divisional scope Proven experience supporting and scaling multi-layered, operationally complex organizations (construction or industrial MEP strongly preferred) Demonstrated success operating as a strategic HR business partner to senior leadership Deep expertise in organizational design, leadership development, employee relations, and HR operations Trac