Senior CAD Designer

LJB Inc.; South Portland (ME); On-site; USD 50,000 - 69,000; Full time

Job summary

LJB Inc. is seeking a Senior CAD Designer to join our South Portland, Maine team. The role focuses on accurate CAD deliverables, complex land development drafting, and coordinating CAD workflows using Civil 3D.

The position is office-based in South Portland with strong technical judgment and experience in Civil 3D. Expect collaboration across project teams and opportunities to support multiple practices within LJB.

Qualifications

• Advanced AutoCAD Civil 3D experience, including surfaces, alignments, profiles, corridors, data shortcuts, plan production tools and CAD standards.
• 5+ years of progressive office-based CAD production, Civil 3D drafting, and data processing.
• Microsoft Excel – advanced data manipulation, file conversion, quantity support, and coordination of project data used in CAD production.

Responsibilities

• Lead the development, refinement, and quality review of site, grading, drainage, utility, plan/profile, and detail sheets using Civil 3D.
• Perform cut-fill and mass balancing analysis utilizing AutoCAD Earthworks and support project decisions.
• Maintain survey point databases, surfaces, data shortcuts, profiles, and cross-sections within Civil 3D for data integrity.
• Develop and manage a standardized field code library to support consistent CAD production across projects.
• Perform quality control reviews of CAD deliverables prior to release and resolve production issues.
• Draft, refine, and review topographic maps and surveys for the survey department as needed.

Skills

Civil 3D drafting

CAD production

Excel advanced

Tools

AutoCAD Earthworks

Job description

Brief Description

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.

We are seeking candidates to fill the position of Senior CAD Designer to join our team in South Portland, Maine. The Senior CAD Designer is responsible for preparing and drafting accurate, high-quality CAD deliverables and providing advanced production support on complex land development projects. This is an office-based position requiring a strong technical judgment, deep proficiency in Civil 3D drafting and data processing, and the ability to coordinate CAD workflows, troubleshoot production issues, and support consistency across project teams. This position may include drafting efforts to support other practices and groups within LJB.

Hourly Pay Range

$36 – $50 /hr based upon experience, certifications, and regional market standards.

Benefits

View our 2026 Benefits Summary

Senior Cad Designer Essential Functions

CAD Drafting & Deliverables

• Lead the development, refinement, and quality review of site, grading, drainage, utility, plan/profile, and detail sheets using Civil 3D, ensuring deliverables are accurate, coordinated, and aligned with project requirements.
• Perform cut-fill and mass balancing analysis utilizing AutoCAD Earthworks and use results to support project team decision-making.
• Maintain survey point databases, surfaces, data shortcuts, profiles, and cross-sections within Civil 3D, ensuring data integrity and consistency across project files.
• Develop, utilize, and manage a standardized field code library, ensuring consistent layering, symbology, and linework to support consistent CAD production across all projects.
• Perform quality control reviews of CAD deliverables prior to release, identifying errors, resolving production issues, and confirming deliverables meet applicable project, client, and company standards.
• Occasionally Support the survey department by drafting, refining, and reviewing topographic maps, ALTA surveys, construction staking plans, boundary plats, and as-built drawings using Civil 3D.

Communication & Coordination

• Coordinate closely with licensed engineers, project surveyors, design/production staff, and public agencies to resolve production questions, align deliverables with applicable standards, and support timely project completion.
• Provide technical guidance to less experienced CAD and engineering staff, sharing best practices, reviewing work for accuracy, and supporting consistent application of CAD standards and production workflows.
• Maintain organized project records, metadata, and archive structures.
• Lead or actively participate in cross-office coordination meetings to align data formats, templates, CAD standards, and production workflows.

Required Qualifications

CAD DESIGNER ESSENTIAL CREDENTIALS

• Advanced AutoCAD Civil 3D experience required, including demonstrated proficiency with surfaces, alignments, profiles, corridors, data shortcuts, plan production tools, and CAD standards.
• 5+ years of progressive office-based CAD production, Civil 3D drafting, and data processing.
• Microsoft Excel – advanced data manipulation, file conversion, quantity support, and coordination of project data used in CAD production.

Core Skills

• Desire to innovate and solve difficult problems from inception to final deliverable.
• Ability to react quickly and calmly to high-pressure situations.
• Ability to work independently and in team settings.
• Excellent written and verbal communication skills.

Why Join LJB?

Join a team that values collaboration, technical excellence, and innovation. At LJB, you'll have the opportunity to work on challenging land development projects, leverage advanced technology, and grow your career with a nationally recognized engineering firm that has been delivering sustainable solutions for more than 50 years.

LJB Inc. is an equal opportunity employer and prohibits discrimination and harassment of any kind. We are committed to creating a diverse and inclusive workplace where all employees are valued, respected, and have the opportunity to succeed. Employment decisions are based on qualifications, merit, and business needs, without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, genetic information, marital status, or any other protected status under applicable law. If you are a self-starting individual who wishes to join an established team that believes in excellence in the workplace, this opportunity is for you.

Keywords

Senior CAD Designer, Drafter, Civil Engineering, Land Development, Maine