Quality Control Technician

Knight's Companies; North Charleston (SC); On-site; USD 42,000 - 52,000; Full time

Benefits offered by this job

Competitive pay

Medical, Dental, Vision Insurance

Paid Time Off (PTO)

401(k) with Company Match

Short-Term Disability (STD)

Long-Term Disability (LTD)

Company-Paid Life Insurance

Voluntary insurance programs

Job summary

Knight’s Companies in South Carolina is seeking a Quality Control Technician to ensure the quality and consistency of our ready‑mix concrete products. You will perform critical testing at plant sites and job locations, supporting production to meet customer specifications and industry standards.

The role requires a high school diploma, valid driver's license, and an ACI Field Tech Level I certification, plus at least one year in QC. We offer competitive pay, benefits, and growth opportunities.

Qualifications

• High school diploma required; Associate's degree preferred.
• Excellent communication and organizational skills.
• Current, valid state driver's license.
• ACI Concrete Field Tech Level I certification required.
• Minimum of 1 year experience in a quality control.
• Ability to interpret construction specs and concrete mix designs.
• Proficiency in reading, understanding, speaking, writing English.

Responsibilities

• Perform QC testing on concrete and aggregates, including slump, air content, unit weight, and compressive strength.
• Monitor production and delivery performance to ensure consistent product quality.
• Coordinate with plant and dispatch teams to implement necessary quality adjustments.
• Conduct trial batches and evaluate mix designs ahead of project needs.
• Oversee third‑party testing services.
• Maintain accurate testing records and documentation.
• Ensure compliance with NRMCA Plant Certification requirements.
• Maintain lab equipment and work areas to industry standards.
• Uphold safety and environmental policies.
• Deliver professional, customer‑focused service at all times.

Skills

Communication skills

Organizational skills

Driver's license

MS Office

ACI Field Tech I

QC experience

Concrete mix designs

English proficiency

Independent worker

Education

High school diploma

Associate's degree preferred

Tools

MS Office

Job description

Since 1969, Knight’s Companies has grown from a single septic tank pumping truck into a trusted, family-owned leader in construction and manufacturing services. Built on quality, integrity, and customer service, Knight’s Companies is committed to excellence across its Redi-Mix, Precast, Trucking, and Pumping operations.

Join our team as a Quality Control Technician, where you’ll play a key role in ensuring the quality and consistency of our ready-mix concrete products. In this position, you’ll work both at plant sites and job locations, performing critical testing and supporting production to meet customer specifications and industry standards.

What You'll Do:

• Perform quality control testing on concrete and aggregates, including slump, air content, unit weight, and compressive strength
• Monitor production and delivery performance to ensure consistent product quality
• Coordinate with plant and dispatch teams to implement necessary quality adjustments
• Conduct trial batches and evaluate mix designs ahead of project needs
• Oversee and collaborate with third‑party testing services
• Maintain accurate testing records and documentation
• Ensure compliance with NRMCA Plant Certification requirements
• Maintain lab equipment and work areas to industry standards
• Uphold all safety and environmental policies
• Deliver professional, customer‑focused service at all times

What You Need to Be Successful:

• High school diploma required; Associate's degree preferred.
• Working computer knowledge; including applicable Microsoft software.
• Current, valid state driver's license.
• Excellent communication and organizational skills.
• ACI Concrete Field Tech Level I certification required.
• Minimum of 1 year experience in a quality control.
• Ability to understand, interpret, and use construction specifications and concrete mix designs.
• General knowledge of the properties, characteristics, and performance of concrete mixes, its components, additives, and raw materials.
• Ability to work independently with minimal supervision.
• Ability to accurately understand, analyze, and interpret information.
• Proficiency in reading, understanding, speaking, writing, and using the English language.
• Ability to accurately perform basic mathematical functions including adding, subtracting, multiplication, division, percentage computations and basic area and volume computations using fractions, decimal equivalents or whole numbers, and basic area, volume, unit weight, and total weight computations.
• Ability to work as part of a team.
• Ability to accept and follow direction as provided by managers, and ask questions when needed.
• Ability to work overtime as needed.

#ZR

What We Offer:

• Competitive pay
• Medical, Dental, and Vision Insurance
• Paid Time Off (PTO) and Paid Holidays
• 401(k) with Company Match
• Short-Term Disability (STD)
• Long-Term Disability (LTD)
• Company-Paid Life Insurance
• Voluntary insurance programs including Life, Critical Illness, Hospitalization, Accident and Pet Insurance.

Interested in opportunities in other Knight’s Companies locations?

We’re hiring across our other markets:

• Lowcountry: Charleston/Jedburg/St. George/Moncks Corner
• Midlands: Columbia/Lexington/Irmo/Blythewood/Lugoff/Sumter
• South: Aiken/Hampton/Beaufort/Okatie/Richmond Hill/Savannah

Visit our careers page to explore all openings: www.knightscompanies.com

Join our team and be part of a company that values safety, hard work and professionalism. We offer a supportive work environment, opportunities for growth, and comprehensive benefits to help you succeed in your career.

EOE