Part-time Civil Engineering CAD Designer

LJB Inc. is a fast-growing national engineering firm specializing in civil and structural engineering and geospatial, safety, health, and environmental services. The firm has a 50+ year history of leveraging new technologies to drive innovation and bring unique and sustainable value to our clients.

About the role

We are seeking a Part-time CAD Designer to join our team in South Portland, Maine. This office-based position requires a foundation in plan and graphics production, combined with proficiency in CAD drafting and data processing. The role supports civil engineering and survey projects by producing accurate, high-quality design drawings and technical deliverables. It is ideal for someone with strong Civil 3D skills who enjoys detail-oriented work, cross-functional collaboration, and contributing to projects from concept through completion.

Responsibilities

• Draft and refine site, grading, drainage, and utility plans, along with plan/profiles and detail sheets using Civil 3D.
• Occasionally perform cut-fill and mass balancing analysis utilizing AutoCAD Earthworks.
• Maintain and update survey point databases, surfaces, data shortcuts, profiles, and cross-sections within Civil 3D.
• Utilize and manage a standardized field code library, ensuring consistent layering, symbology, and linework across all projects.
• Perform quality control checks on outgoing CAD deliverables to ensure accuracy and completeness.
• Draft and refine topographic maps, ALTA surveys, construction staking plans, boundary plats, and as-built drawings using Civil 3D in support of our survey department.
• Work closely with licensed engineers, project surveyors, and design/production staff to ensure project deliverables meet applicable standards.
• Maintain organized project records, metadata, and archive structures.
• Participate in cross-office coordination meetings to align data formats, templates, and workflows.
• Demonstrate a desire to innovate and solve difficult problems from inception to final deliverable.
• Perform other duties as assigned.

Requirements

• CAD design experience and AutoCAD Civil 3D experience.
• At least 1 year of experience in office-based data processing.

Preferred Qualifications

• Associate’s degree.
• CAD production experience.
• Microsoft Excel experience with advanced data manipulation and file conversion.

Skills

• Quality control and attention to detail.
• Cross-functional communication and coordination.
• Organization and project record management.

Pay

Hourly pay range: $20 – $36 per hour, based on experience, certifications, and regional market standards.

Benefits

View our 2026 Benefits Summary.

Why Join LJB?

At LJB, you’ll have the opportunity to contribute to meaningful civil engineering and survey projects while growing your skills in a collaborative, supportive environment. Join a company known for diverse opportunities, strong core values, and a commitment to improving quality of life through engineering excellence.