Summary
Overview
Work History
Education
Skills
Military Principles I Apply to My Career and Life
Languages
Timeline
Generic

Donaciano Hernandez Jr

Fallbrook,CA

Summary

Highly disciplined and versatile professional with 15+ years of combined military and technical experience in leadership, mechanical systems, welding, and HVAC. Proven ability to manage teams, train personnel, and execute complex projects under demanding conditions. Adept at problem-solving, process improvement, and ensuring operational excellence. Committed to applying the leadership principles and work ethic developed in the Marine Corps to every role, fostering growth, accountability, and teamwork.

Professional focused on HVAC systems with experience in installation, maintenance, and repair. Strong technical skills in diagnostics, troubleshooting, and system optimization. Team player who adapts to changing environments and prioritizes achieving results. Reliable and driven to ensure efficient and high-quality outcomes in all tasks.

Overview

19
19
years of professional experience

Work History

HVAC Technician

Associate Mechanical Contractors
10.2022 - Current
  • Install, maintain, and repair residential and commercial HVAC systems to ensure optimal performance and energy efficiency.
  • Diagnose mechanical, electrical, and refrigeration issues, resolving complex system malfunctions.
  • Maintain and service Dunham-Bush chillers in compliance with manufacturer specifications.
  • Conduct preventative maintenance to minimize downtime and extend equipment lifespan.
  • Adhere to OSHA 10 safety standards to maintain safe work environments.
  • Collaborate with project managers and team members to complete projects on time and within budget.
  • Document service activities and maintain detailed client records.

Welder & Foreman Fabricator

Eagle Eye Fabrication
11.2017 - 07.2025
  • Successfully completed multiple projects independently, with budgets ranging from $10K to $100K.
  • Supervised and coordinated fabrication projects, ensuring adherence to deadlines and quality standards.
  • Executed welding, cutting, and assembly of metal structures according to blueprints and specifications.
  • Trained and mentored junior welders, improving team efficiency and skill levels.
  • Conducted inspections to ensure compliance with safety regulations and company standards.
  • Managed materials, tools, and workflow to optimize productivity and minimize waste.
  • Collaborated with clients and engineers to resolve technical issues and meet project requirements.
  • Operated MIG and TIG welding equipment to produce high-quality metal fabrications.
  • Assisted in training new employees on welding techniques and safety practices.
  • Conducted inspections of completed welds for quality assurance and compliance with specifications.
  • Collaborated with team members to streamline production processes and improve efficiency.
  • Welded in flat, horizontal, vertical, and overhead positions.
  • Strengthened client relationships by delivering consistent, high-quality workmanship on all projects.

Diesel Mechanic, Drill Instructor, Combat Marksman

United States Marine Corps,
03.2007 - 11.2017
  • Trained and mentored 400+ recruits, instilling discipline, resilience, and teamwork while developing future leaders.
  • Instructed and qualified thousands of Marines in advanced marksmanship, enhancing unit readiness and performance under pressure.
  • Maintained and repaired tactical vehicles and diesel engines, ensuring operational reliability in high-stress environments.
  • Guided Marines of all ranks, fostering professional growth and team cohesion.
  • Designed and delivered training programs in technical skills, leadership, and adaptability transferable across industries.
  • Managed personnel, equipment, and mission-critical tasks with precision, accountability, and efficiency.
  • Self-motivated, with a strong sense of personal responsibility.
  • Worked effectively in fast-paced environments.
  • Skilled at working independently and collaboratively in a team environment.
  • Proven ability to learn quickly and adapt to new situations.
  • Excellent communication skills, both verbal and written.

Education

Some College (No Degree) - Management

Palomar College
San Marcos, CA

HVAC Certification - HVAC

UEI College
Oceanside, CA
05.2024

Skills

  • Leadership & Team Development
  • Diesel & Mechanical Systems Maintenance
  • Welding & Fabrication Management
  • HVAC Installation, Maintenance & Troubleshooting
  • Training & Mentorship
  • Safety Compliance (OSHA 10)
  • Planning & Coordination
  • Operational Excellence & Accountability
  • Technical troubleshooting
  • System troubleshooting
  • Certified HVAC technician
  • Focused on safety
  • Quality-focused
  • Customer focused

Military Principles I Apply to My Career and Life

  • Continuous Self-Improvement: Always seek to grow personally and professionally.
  • Technical and Tactical Excellence: Maintain high standards in every task, from machinery repair to leadership.
  • Responsibility and Accountability: Own my actions and inspire others to do the same.
  • Sound and Timely Decision-Making: Act decisively to achieve effective results.
  • Leading by Example: Demonstrate integrity, discipline, and dedication.
  • Mentorship and Team Support: Guide and encourage team members to build strong, cohesive teams.
  • Clear Communication: Ensure tasks, expectations, and updates are understood.
  • Task Completion and Follow-Through: Ensure responsibilities are fully understood and successfully accomplished.

Languages

Spanish
Native or Bilingual

Timeline

HVAC Technician

Associate Mechanical Contractors
10.2022 - Current

Welder & Foreman Fabricator

Eagle Eye Fabrication
11.2017 - 07.2025

Diesel Mechanic, Drill Instructor, Combat Marksman

United States Marine Corps,
03.2007 - 11.2017

HVAC Certification - HVAC

UEI College

Some College (No Degree) - Management

Palomar College
Donaciano Hernandez Jr