Aide Infrastructure Engineer Jobs (NOW HIRING)

Salary: $29.74 - $36.15 Hourly
Location : Santa Rosa, CA
Job Type: Extra Help
Job Number: 26/05-1001-EHC
Department: Sonoma County Public Infrastructure (SPI)
Opening Date: 05/20/2026
Closing Date: Continuous
Bargaining Unit: 05
Position Information
Grow your technical experience with the County of Sonoma.
No work experience required!
Starting salary up to $36.15/hour* depending upon experience.
Here at the County of Sonoma, Engineering Aide positions offer opportunities to gain experience toward career growth in the field of sub-professional engineering. As you gain on-the-job training and experience, you can progress through our career ladders. While all of our sub-professional and professional engineering positions require knowledge of algebra and geometry as well as the ability to accurately enter data, conduct reporting, and track and maintain project records, the County offers various starting points for you to begin exploring your career in civil engineering. As an extra-help Engineering Aide, you can gain experience that may qualify you for an alternate appointment to an Extra-Help Engineering Technician I position.
Sonoma Public Infrastructure (SPI) leads the way to a safe and sustainable community by planning, building, managing, and maintaining Sonoma County's investment in quality services and infrastructure. Working in the office and out in the field, SPI Engineering Aides support the Construction Contract Administration, Engineering Design, Field Survey Crew, Materials Lab, and Transportation work groups. Additional duties may include:

• Performing construction material testing in the field on County roads and working in the Materials Lab
• Conducting field surveys, processing survey data in AutoCAD, and reviewing right-of-way maps.
• Supporting staff with both field and office tasks, collecting data, and verifying calculations

The ideal Engineering Aide candidate will possess many of the following:

• The ability to learn to gather and confirm field data, ensure compliance with plans and specifications, and perform PG&E invoice reviews
• Strong analytical and problem-solving skills, and the ability to work independently and prioritize daily activities
• Excellent customer service skills, and the ability to work cooperatively with applicants, industry representatives, staff, and other agencies
• Training and/or experience using drafting software such as AutoCAD, AutoCAD Civil 3D, etc.
• A passion for field work, an interest in infrastructure construction and maintenance projects, patience, and a sense of humor to readily accept last-minute assignment changes

Extra-Help Employment
Extra-help employees relieve or augment permanent staff. Intermittent, extra-help employees are not in the classified civil service and do not have property rights to permanently allocated positions. In addition, they do not receive most regular employee benefits such as: long-term disability insurance coverage; accrual of vacation; participation in the County retirement program; or eligibility to take promotional examinations. Intermittent, extra-help employees are limited in their employment to a maximum of 1,380 hours within any twelve-month consecutive period. Extra-help employees who meet the eligibility requirements may qualify for a County contribution toward medical coverage.
This recruitment is being conducted to fill multiple extra-help positionsin SPI. This employment list may also be used to fill future extra-help positions as they occur during the active status of the list.
*Salary is negotiable within the established range.
Application submissions require the Supplemental Questionnaire to be completed.
Minimum Qualifications
Experience: Any combination of experience which would provide an opportunity to acquire the knowledge and abilities listed. Normally, academic course work in plane geometry, trigonometry, algebra, and surveying would provide such opportunity. Post high school education in engineering technology, including computer aided drafting and design would be desirable.
Education: Academic course work in plane geometry, trigonometry, algebra, and surveying which would provide an opportunity to acquire the knowledge and abilities listed. Course work in an Engineering Technology curriculum leading to an Associate Degree is desirable.
License: Possession of a valid driver's license at the appropriate level, including special endorsements as required by the State of California, may be required depending upon assignment to perform the essential job functions of the position.
The position advertised on this announcement does require possession of a valid California Driver's License.
Knowledge, Skills, and Abilities
Knowledge of: mathematics, engineering maps and records; electronic information systems.
Ability to: trace simple maps and plans; make arithmetical calculations quickly and accurately; learn to operate a wide variety of computer applications; gather data and prepare accurate reports; read and understand technical descriptions; understand and follow oral and written directions; work cooperatively with other staff; climb, stand and walk for sustained periods of time, perform physical tasks such as chopping, digging, flagging, and traffic control, and lift moderately heavy objects; utilize electronic information systems and analyze and interpret such information; communicate effectively with coworkers and the public.
Selection Procedure & Some Helpful Tips When Applying

• Your application information and your responses to the supplemental questions are evaluated and taken into consideration throughout the entire selection process.
• You should list all employers and positions held within the last ten years in the work history section of your application. Be as thorough as possible when responding to the supplemental questions.
• You may include history beyond ten years if related to the position for which you are applying. If you held multiple positions with one employer, list out each position separately.
• Failure to follow these instructions may impact your competitiveness in this process or may result in disqualification.

Please visit to review more detailed information about the hiring process, including the application process, examination steps, and department selection process.
Application submissions require the Supplemental Questionnaire be completed.
Responses to supplemental questions are used to evaluate your qualifications. Please provide sufficient information to allow for a thorough evaluation of your qualifications.
The selection procedure will consist of the following examination:
An Application and Supplemental Questionnaire Appraisal Examination (pass/not pass) will be conducted to evaluate each applicant's combination of educational coursework, training, experience, knowledge, and abilities that relate to this position to ensure satisfaction of the minimum qualifications for this position. Candidates who possess the minimum qualifications for the position will be placed on an extra-help employment list and referred to the department. The department may contact candidates from the employment list who possess the most appropriate job-related qualifications for further consideration.
Additional InformationA background investigation is required prior to employment. Candidates referred to departments for a selection interview are typically required to sign authorization and release forms enabling such an investigation. Failure to sign prescribed forms will result in the candidate not being considered further for that vacancy. Reference information will not be made available to candidates.
Additional requirements, such as successful completion of a physical exam, drug screen, etc., may apply, depending on the duties and responsibilities of the position. If you receive a conditional job offer for the position, the requirements upon which the offer is contingent will be outlined in the conditional job letter. You may also review the to determine the requirements for this position.
How To Apply
Applications are accepted online at Paper applications may be submitted by person, fax (707-565-3770), email, or through the mail. All applications and appropriate supplemental information as outlined in the job bulletin must be received by the time and date specified on the first page of this job announcement. Continuous recruitments may close without notice at any time that a sufficient number of qualified applications have been received. Applications received after the recruitment closes will not be accepted.
The County of Sonoma values diversity and is dedicated to creating a workplace environment that provides individuals with a sense of belonging. We are committed to having a diverse workforce that is representative of the communities we serve. The County is proud to be an Equal Opportunity Employer where all aspects of employment are based on merit, competence, performance, and business need.
HR Analyst: JT
HR Technician: NM
Important Note: Benefits described herein do not apply to Extra Help positions.
County of Sonoma Benefits: General*
These are some of the excellent benefits the County offers:
Paid Time Off: Competitive vacation accrual and sick leave accruals; additional management leave annually; 12 paid holidays, and an additional 8 floating holiday hours per year; and may be eligible for up to 8 weeks (320 hours) of Paid Parental Leave after 12 months of County employment.
Health Plan: Choose from nine health plans (three HMOs, three deductible HMOs, and three HSA-qualifying plans) with a generous County contribution to the premium (the contribution amount varies by bargaining unit). For more information, please see the appropriate MOU.
Retirement: Fully integrated with Social Security. For more information regarding eligibility, retirement contributions, and reciprocity with prior public service, please visit
IRS 457 Plan: Pre-tax employee contribution up to the IRS annual maximum.
Retiree Medical: County contribution to a Health Reimbursement Arrangement to help fund post-retirement employee health insurance/benefits.
Student Loan Debt Relief: County employees may be eligible for through the U.S. Department of Education.
Plus, excellent dental, vision, disability, life insurance, professional development, and more.
For answers to specific questions regarding the employment process and more details about benefits or retirement, please contact Human Resources at (707) 565-2331. Additional details about benefit and compensation packages can be found in the MOUs located at For specific information about health and welfare benefits, including plan options, coverage, and premium amounts, go to or contact the Human Resources' Risk Management-Benefits Office at or (707) 565-2900.
*Important Notes: Benefits described herein do not represent a contract and may be changed without notice.
01
How did you first learn about this opportunity?

• Careers in Government
• College or University
• County of Sonoma Human Resources Office
• DiversityJobs
• Employee of Sonoma County
• Facebook
• Glassdoor
• GovernmentJobs.com
• Handshake
• Indeed
• Instagram
• Job Fair
• Latino Service Providers
• LinkedIn
• Los Cien
• Press Democrat
• sonoma-county.org/www.yourpath2sonomacounty.org
• Start Here!
• X (Twitter)
• Veterans Services Office
• Women's Organization or Group
• Other Internet Site
• Other Publication

02
This eligible list may be used for future bilingual (English/Spanish) positions. Please indicate if you are interested in bilingual positions and your level of proficiency.

• Yes, I have basic (conversational) English/Spanish bilingual skills
• Yes, I have fluent (reading, writing, and conversational) English/Spanish bilingual skills
• No, I do not have English/Spanish bilingual skills, and/or I do not wish to be considered for a bilingual position

03
Do you possess, or have the ability to obtain, a valid State of California Class C driver's license by date of hire?

• Yes
• No

04
Responses to supplemental questions are used to evaluate your qualifications. Please provide sufficient information to allow for a thorough evaluation of your qualifications.
Please list your coursework in algebra, geometry, trigonometry, surveying, and computer-aided drafting and design that meets or exceeds this position's minimum qualifications.
Also, if you are a certified Engineering Technician and/or Engineering Technologist, please let us know.
05
Please describe the types of drafting and design projects you have worked on, and highlight your experience using drafting software such as AutoCAD, AutoCAD Civil 3D, etc. Provide a detailed example of a project you worked on that best demonstrates your level of expertise.
06
Please describe your experience gathering, tracking, analyzing, and cross-checking data from multiple sources to prepare reports and make recommendations. Highlight your experience calculating quantities.
Required Question