Principal Traffic Engineer

At Mott Mac Donald, we are driven by purpose and powered by brilliant people. As a trusted engineering, management, and development consultancy, we work with clients to solve complex challenges and deliver sustainable outcomes that make a meaningful difference for the communities we serve.

When you join us as an experienced professional, you will bring your expertise to work that matters while continuing to grow your career. You will collaborate with talented colleagues across disciplines and geographies, contribute your perspective, and help shape better outcomes through technical excellence, innovation, and integrity.

Build on your experience while helping shape what comes next. At Mott Mac Donald, you'll work alongside talented people on complex and rewarding projects that make a real difference. We value fresh perspectives, encourage collaboration, and provide opportunities to expand your skills, take on new challenges, and grow your career. Whether you're deepening your technical expertise, broadening your leadership experience, or exploring new opportunities across our business, you'll be supported by a team that is committed to helping you succeed.

Mott Mac Donald is seeking an experienced Traffic Engineering Leader to join our growing Southern California transportation team. Based in the Los Angeles area, this role will provide technical leadership across a diverse portfolio of transportation infrastructure projects, including major assignments with LA Metro, California High-Speed Rail, Olympic Games-related programs, and other public-sector transportation initiatives.

This is a leadership opportunity for a California-licensed Traffic Engineer who combines strong technical expertise with client engagement, project delivery, and team development capabilities. You will serve as a trusted advisor to key clients, oversee critical traffic engineering reviews and designs, mentor developing engineers, and help expand our traffic engineering presence across Southern California.

The successful candidate will join a small but growing team and play a key role in shaping its future growth, technical capability, and market presence.

This role offers the opportunity to work on some of the most significant transportation programs in Southern California while helping build and lead a growing traffic engineering practice. You will have immediate project opportunities, direct client exposure, and the chance to shape how transportation infrastructure is delivered across the region. We are looking for a technically respected leader who is passionate about transportation, enjoys solving complex challenges, and is motivated to help grow both people and business.

• Serve as the technical lead for traffic engineering projects across Southern California.
• Lead the review, development, and approval of worksite traffic control plans, transportation management plans, construction phasing strategies, and detour plans.
• Provide technical oversight for LA Metro traffic-control review assignments supporting active and planned capital projects.
• Support California High-Speed Rail and other transportation agencies with traffic engineering reviews, third-party design oversight, and transportation management activities.
• Lead traffic engineering efforts associated with major regional events, including Olympic Games transportation improvements and mobility planning initiatives.
• Review, sign, and seal engineering documents and traffic control plans as required.
• Coordinate with public agencies including LA Metro, LADOT, Caltrans, local municipalities, and other transportation stakeholders.
• Provide technical guidance on traffic operations, temporary traffic control, work zone safety, construction traffic management, and transportation planning.
• Support the development and delivery of traffic engineering design packages using AutoCAD Civil 3D and related software tools.
• Manage project scope, schedules, budgets, quality, and deliverables for assigned projects.
• Act as a client-facing technical advisor and build strong relationships with agency stakeholders and transportation decision-makers.
• Support business development activities, including proposal preparation, technical approaches, interviews, and client presentations.
• Mentor and develop junior engineers and technical staff.
• Help recruit, build, and grow the Southern California traffic engineering team as workloads expand.
• Collaborate with multidisciplinary teams across highways, rail, transit, civil…