Internship/Co-Op (Estimator) Summer 2026

OBAYASHI CORPORATION is seeking an Estimator Intern to assist the Estimating team in preparing detailed cost estimates for large-scale infrastructure projects. The role will expose various aspects of the estimating process, from reviewing project specifications to collaborating with subcontractors and suppliers. This is an excellent opportunity for students to gain practical experience in heavy civil construction and develop skills essential for a career in construction management or civil engineering. This role will be based in the Foster City, CA office. 

Key Role & Responsibilities:

This position is expected to start in May/June 2026 and continue through August 2026, if available. We ask for a minimum of 12 weeks, full-time and on-site, for most internships.

The role will expose various aspects of the estimating process, from reviewing project specifications, "Scope Identification, Construction means and methods" to collaborating with subcontractors and suppliers.

• Assist in preparing cost estimates for heavy civil projects, including roads, tunnels, bridges, dams, and other large infrastructure projects.
• Review project plans, drawings, and specifications to determine project scope and requirements.
• Perform quantity take-offs and assist with pricing materials, labor, and equipment for bids and proposals.
• Research historical data and develop unit costs based on material and labor costs.
• Collaborate with subcontractors, vendors, and suppliers to obtain and review quotes.
• Participate in internal meetings and support the team in bid preparations and presentations.
• Assist in evaluating project risks, identifying potential cost-saving measures, and ensuring compliance with company and client standards.
• Update and maintain estimating databases and historical cost records.
• Perform additional duties as needed to support the estimating and preconstruction teams.

Qualifications:

• Currently pursuing in Civil Engineering, Construction Management, or a related field.
• Strong interest in heavy civil construction and infrastructure projects.
• Basic knowledge of construction processes and terminology.
• Proficiency in Microsoft Office (Excel, Word, and PowerPoint); familiarity with estimating software is a plus.
• Strong analytical skills with attention to detail and accuracy.
• Excellent written and verbal communication skills.
• Ability to work independently and as part of a team in a fast-paced environment.
• Willingness to learn and take initiative.

Preferred Qualifications:

• Previous internship or related experience in construction or estimating is a plus.
• Familiarity with AutoCAD, Bluebeam, or similar software.
• Knowledge of construction cost databases such HCSS Heavy Bid Estimating Software is a plus.

What You’ll Gain:

• Hands-on experience in estimating for heavy civil projects.
• Exposure to major infrastructure projects and industry best practices.
• Mentorship and guidance from experienced engineers and estimators.
• Opportunity to work with a global leader in construction and make valuable industry connections.
• Potential for full-time employment opportunities upon successful completion of the internship.

HOURLY PAY RANGES:

• $25-$30/ HOUR

The expected pay range for this position is $25.00 to $30.00 per hour. Obayashi Corporation provides pay ranges representing its good faith estimate of what it reasonably expects to pay for a position. This pay range reflects what we reasonably expect to pay for this role within California. We strive to offer competitive and fair compensation across all locations. The pay offered to a selected candidate will be determined based on factors such as (but not limited to) the scope and responsibilities of the position, the qualifications of the selected candidate, departmental budget availability, internal equity, geographic location and external market pay for comparable jobs.

About Obayashi 

Obayashi Corporation has delivered quality solutions to infrastructure challenges across the globe for more than 130 years. Founded in 1892, Obayashi is the largest Japanese Contractor, and is the fourth largest International Contractor conducting business in the United States. Obayashi has been operating and completing projects in the United States since 1979. Obayashi provides a full range of general contractor services in both public works and private sectors including: office buildings, residences, tunnels, highways, rail systems, bridges, artificial islands, airports and nuclear power plants. Other services include urban planning and architecture, real estate and property development, environmental, and waste services. The North American Operations consolidated revenue is over $3 billion in the United States and Canada. 

Equal Opportunity Employer 

Obayashi Corporation is an equal opportunity employer and makes employment decisions on the basis of merit. We want to have the best available persons in every job. Company policy prohibits unlawful discrimination based on race, color, creed, gender, religion, marital status, registered domestic partner status, age, national origin or ancestry, physical or mental disability, medical condition including genetic characteristics, sexual orientation, or any other consideration made unlawful by federal, state, or local laws. It also prohibits unlawful discrimination based on the perception that anyone has any of those characteristics, or is associated with a person who has or is perceived as having any of those characteristics. The Company is committed to compliance with all applicable laws providing equal employment opportunities. This commitment applies to all persons involved in Company operations and prohibits unlawful discrimination by any employee of the Company, including supervisors and coworkers.