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Salary
$150k – $200k per year
Location
In office (Los Angeles)
Seniority
Principal · 15+ years exp

Confirmed on the employer's own hiring board on Sep 28, 2026. First seen by Alion on Sep 28, 2026.

Overview
Company
Impact
Profile match

Overview

Carollo Engineers is a leading engineering firm dedicated exclusively to water. For over 90 years, we've specialized in the planning, design, and construction of water, wastewater, stormwater, and reuse facilities, bringing innovative and sustainable solutions to the water sector's most complex challenges.

We work with water agencies, municipalities, utilities, research organizations, and private companies across various industries, including technology, manufacturing, and beyond. These clients choose Carollo because we employ some of the most knowledgeable and experienced professionals in the world. When you join our team, you'll work alongside industry leaders who are advancing the science of water, protecting public health, and building resilient communities.

Carollo's vision is to be the best water consulting firm and the best place for you to build your career. If you're passionate about making a difference in this critical field, we invite you to explore a career with Carollo.

Responsibilities

We are seeking a Principal Engineer to provide design management, project management, and client service support to our clients within the Los Angeles area, with a focus on design/build projects. As part of our team, you will work on:

  • Projects related to municipal water and wastewater treatment plants, including but not limited to major treatment plant expansions, and critical water reuse projects that will create sustainable and resilient water supplies for the world.
  • Plans, schedules, and conducts engineering work on wastewater and reuse projects of significant size and complexity, with full responsibility over design decisions and quality standards
  • Specific work will include preliminary design, detailed design, and engineering services during construction
  • Representative engineering tasks include the development of hydraulic calculations, treatment process evaluations and sizing, preparation and review of technical memoranda, design development and reviews, design management in coordination with discipline engineers (e.g. civil, structural, mechanical, electrical, instrumentation and controls), and QA/QC
  • Supervises team of several subordinates of project engineer or senior project engineer level with multiple engineering or professional disciplines included
  • Mentors entry to mid-level engineers and supervises their work on project assignments; provides direction on how to execute work, provides examples, and reviews their work
  • Provides design expertise as part of project pursuits during proposals, and contributes to the development of statement of qualifications and proposals
  • Negotiates critical and controversial issues with top-level engineers and officers of other organizations and companies
  • Serve as project manager for some mid- to large-sized projects
  • Provide overall responsibility for several projects concurrently
  • Demonstrates high degree of creativity, foresight, and mature judgment in planning, organizing, and guiding extensive engineering programs and activities of outstanding novelty and importance
  • Initiates and maintains extensive contacts with key engineers and decision makers of other organizations and companies, requiring skill in persuasion and negotiation of critical issues
  • Ability to prepare proposals and interviews, and to lead negotiating efforts with client after selection
  • Develops and maintains positive relationships with client management personnel
  • Identifies need for, and ability to direct and actively manage subconsultants performing services on projects
  • Active in professional associations, including presentations of technical papers, member of technical committees, and officer of local or national organization
  • Identifies need for recruitment of new employees and participates in the identification, interview, and selection process
  • Travel required when requested

Qualifications

  • Bachelor's degree in civil, environmental, or chemical engineering
  • 10+ years of wastewater and reuse design experience in the field of environmental consulting engineering with an emphasis in hydraulics, physical, chemical, and biological treatment processes and treatment plant design for wastewater and reuse
  • Comprehensive experience in treatment plant design is required
  • Registration as a Professional Engineer in the State of California
  • Must have demonstrated experience with managing and designing medium- to large-sized projects with full responsibility for budget, schedule, contractual obligations and quality standards
  • Ability to evaluate progress of staff and results obtained, and recommends major changes to achieve overall objectives
  • Demonstrate creative, foresight and mature engineering judgment in anticipating and solving unprecedented engineering problems
  • Ability to communicate effectively with clients and project team
  • Deliver high quality services within budget and schedule constraints
  • Familiar with a broad range of issues related to wastewater and reuse systems, including master planning, conveyance, with an emphasis on treatment plant design
  • Knowledge of structural and geotechnical design concepts, analytical laboratory techniques and familiarity with codes and regulation related to drinking water
  • Sensitive to political issues and client preferences
  • Work well in a team environment
  • Proficient in public speaking roles
  • Proficient in MS Word and Excel

Preferred Qualifications

  • 15+ years of wastewater and reuse design experience in the field of environmental consulting engineering with an emphasis in hydraulics, physical, chemical, and biological treatment processes and treatment plant design for water, wastewater, and/or reuse
  • Experience in MBR treatment and advanced treatment facilities design
  • Experience with Microstation or AutoCAD
  • Master's degree in civil or environmental engineering
  • Design and construction phase experience
  • Experienced in in using tools to managing project financials, managing schedule, and in managing quality

Compensation Range

$150,000 to $200,000 annually. This is the lowest to highest salary we in good faith believe we would pay for this role at the time of this posting. We may ultimately pay more or less than the posted range, and the range may be modified in the future. An employee’s pay within the salary range will be based on several factors including, but limited to, relevant education, qualifications, certifications, experience, skills, seniority, geographic location, performance, and business or organizational needs.

Other Compensation and Benefits

Carollo is committed to providing employees with a competitive, comprehensive benefits program that provides the support employees and their families need to lead healthy, productive lives. Carollo’s benefits package includes paid time off and holidays, comprehensive health insurance coverage, pre-tax savings account options for healthcare, dependent care and commuter expenses, disability insurance and life insurance options for you and your dependents. We also offer free Caregiver Support, Travel Assistance, counseling services, discount programs, and a Lifestyle Reimbursement Account. Other compensation that may be available includes: 401(k) company contribution matching, tuition reimbursement, discretionary bonuses, career advancement bonuses, professional registration bonuses, employee referral bonuses, and compensatory time for exempt employees. Flexible work arrangements may also be available. Eligibility for benefits varies based on employment status.

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