Senior Civil 3D Designer – Infrastructure & 3D Modeling

Mott MacDonald; Los Angeles (CA); Hybrid; USD 84,000 - 103,000; Full time

Benefits offered by this job

401(k) matching

Medical insurance

Dental insurance

Vision insurance

Paid holidays

PTO

Parental leave

Life insurance

Job summary

Mott MacDonald in Los Angeles is seeking an experienced Civil 3D Designer to produce detailed civil infrastructure drawings and 3D models. You will work with engineers and project managers to convert concepts into constructible plans for roads, drainage, utilities, and site developments.

You will contribute to design reviews, ensure compliance with standards, and collaborate across disciplines in a hybrid office environment. Strong 5+ year background in civil design is preferred.

Qualifications

• Minimum 5 years of civil engineering design experience.
• Advanced proficiency with AutoCAD Civil 3D.
• Experience developing grading, drainage, utility, roadway, or site plans.
• Ability to work effectively in a collaborative, multidisciplinary environment.

Responsibilities

• Develop and refine detailed civil engineering drawings using AutoCAD Civil 3D for grading, drainage, utilities, and roadway design.
• Collaborate with engineers and project managers to translate concepts into accurate, constructible plans.
• Create 3D surface models, alignments, profiles, corridors, and cross-sections for infrastructure projects.
• Prepare plan sets, quantity calculations, and construction documentation.
• Ensure all designs meet applicable codes, standards, and client requirements.
• Participate in design reviews and provide innovative solutions to technical challenges.
• Coordinate with multidisciplinary teams to support integrated project delivery.
• Maintain organized drawing files, models, and documentation.

Skills

Attention to detail

Communication

Problem solving

Education

Associate degree or technical diploma in civil eng tech

Tools

AutoCAD Civil 3D

Job description

Mott MacDonald in Los Angeles is seeking an experienced Civil 3D Designer to produce detailed civil infrastructure drawings and 3D models. You will work with engineers and project managers to convert concepts into constructible plans for roads, drainage, utilities, and site developments.

You will contribute to design reviews, ensure compliance with standards, and collaborate across disciplines in a hybrid office environment. Strong 5+ year background in civil design is preferred.