78 Results for

Summer Jobs in Ontario, CA

Jobs

Los Angeles, CA8 days ago

Full-time
Employee

Want to live in the mountains for the summer and/or fall season (short-term living accommodations available on-site for $170/week if you are from outside the area, that includes: dormitory style rooms, utilities, internet, laundry, 3 daily buffet style meals). You’ll help create a welcoming, comfortable stay for guests by keeping cabins, lodge rooms, and shared spaces clean and ready.

Seal Beach, CA30+ days ago

Temporary

As a Camp Counselor, you will be an active participant in all camp activities and will assist your Camp Director with a variety of daily tasks, all with the goal of creating a memorable and meaningful camp experience for your campers. We partner with over 230 private clubs all over the country to implement traditional-style day camps for elementary-aged children.

Costa Mesa, CA30+ days ago

Temporary

Los Angeles, CA30+ days ago

$19–$23 Per Hour

We host a variety of programs for the community, including an early childhood center, basketball leagues and classes, swim lessons, summer and winter day camp, fitness classes, family holiday programs, teen leadership and Israel programs, senior wellness and adult programs. Through specialty tracks, enrichment activities, and community-building programming, JCamp fosters creativity, confidence, connection, and a vibrant, inclusive Jewish community.

Los Angeles, CA15 days ago

Chaminade is an independent co-educational Catholic school serving approximately 2,000 students in grades 6-12 at our two beautiful campuses located in the San Fernando Valley area of Los Angeles. The Summer Camp Teacher is responsible for providing leadership, oversight and support to the Chaminade Center for Excellence Summer Program while ensuring the overall well-being and safety of the campers and the activities in the program.

Costa Mesa, CA30+ days ago

Temporary

As you manage campers, their families, club logistics, your small staff team and other camp happenings, you will be truly supported by the KE Camps Year-Round Office all the way. Our Camp Directors have real ownership over their camp programs and enjoy infusing their own creativity and talents into their weekly schedules.

Irvine, CA30+ days ago

TRL11 is a venture backed deep tech / defense tech startup bringing cutting-edge video technology to Aerospace applications. Summer internships typically cover a wide range of disciplines, including mechanical, electrical, optical, manufacturing, software, and test engineering.

Corona, California9 days ago

Intern

Overview: PRMG's Summer Internship Program is designed to introduce college students to all the different career paths within the mortgage industry. At the end of the first two weeks, there will be a midterm exam to determine placement for the remaining six weeks of the program.

Los Angeles, CA30+ days ago

Our summer programs include public speaking camps, college admissions prep programs, science camps, summer acting camp, writing camps, computer camp, leadership camp, video production camp, and college tours. The Personal Statement/College Counseling Instructor is responsible for guiding students through two components of our College Admissions Prep Camp Instruction: First, they will help each student complete 1-2 longer or several shorter personal statement responses so that are ready or nearly ready for submission with their college applications.

New!

Seal Beach, CA1 day ago

Administer first aid in the event of injury, rescue swimmers in distress or danger of drowning, and administer CPR and/or artificial respiration, if necessary . We partner with over 230 private clubs all over the country to implement traditional-style day camps for elementary-aged children.

Perris, CA30+ days ago

We’ve been busy building a best-in-class logistics network that allows us to delight customers by speeding up deliveries, adding services, and reducing damage using our own physical, asset-based warehouses. Develop expertise in your area of focus to become a credible company expert, capable of providing accurate and clear answers to inquiries or knowing where to locate information.

Los Angeles, CA17 days ago

$18.50–$20 Per Hour

The company has a long-standing commitment to corporate social responsibility, including more than $1 billion invested in environmental sustainability; $65 million in charitable giving, education initiatives, and innovative health and wellness programs each year; and $143 million toward the construction of two charter school campuses in California’s Central Valley. Ranked No. 1 on the 2025 PEOPLE® Companies That Care list and one of Fortune® magazine’s “100 Best Companies to Work For” in the U.S., The Wonderful Company is continually recognized for its dedication to the well-being of its workforce, their communities, and the planet.

Los Angeles, CA30+ days ago

$22–$25 Per Hour

We’ve been honored as a National Fortune Best Workplace, a Fortune Best Workplace for Women, Millennials, and Parents, and one of America’s Best Employers by Forbes—along with numerous regional recognitions across our 11 offices nationwide. Placement within the listed range depends on many factors, including, but not limited to, years of experience, project size capability (for Construction & Field roles), and internal company equity.

Riverside, CA30+ days ago

Full-time

Applicants for employment in the US must have work authorization that does not now or in the future require sponsorship of a visa for employment authorization in the United States and with Kroger Co (i.e., H1-B visa, F-1 visa (OPT), TN visa or any other non-immigrant status). Applicants must have work authorization that does not now or in the future require sponsorship of a visa for employment authorization in the United States and with Kroger Co (i.e., H1-B visa, F-1 visa (OPT), TN visa or any other non-immigrant status).

Riverside, CA30+ days ago

Full-time

La Habra, CA30+ days ago

Full-time

From one tiny Cincinnati grocery store more than a century ago, we've grown into what today is the nation's largest grocer with nearly 2,800 stores in 35 states operating under 28 different names. Applicants for employment in the US must have work authorization that does not now or in the future require sponsorship of a visa for employment authorization in the United States and with Kroger Co (i.e., H1-B visa, F-1 visa (OPT), TN visa or any other non-immigrant status).

Los Angeles, CA30+ days ago

Our summer programs include public speaking camps, college admissions prep programs, science camps, summer acting camp, writing camps, computer camp, leadership camp, video production camp, and college tours. The primary responsibility of the SAT or PSAT Instructor is to guide students through the Education Unlimited SAT curriculum in a classroom setting and to motivate and encourage students to improve their test-taking abilities.

Los Angeles, CA8 days ago

$18–$24 Per Hour

Job Types: Seasonal / Temporary Pay Range: $18.00 - $24.00 per hour Locations: 6-7 sites across Greater Los Angeles (including Mid-City, Hancock Park, Third Street, West LA). Strength and endurance required to maintain constant supervision of campers, including prolonged standing, some bending, stooping, walking long distances, and stretching.

Los Angeles, California10 days ago

Overview: We’re seeking a talented, self‑motivated undergraduate for a 10‑week summer internship, 40 hours/week, to support our Communications team in developing social media strategy and content, with a primary focus on TikTok. This role will directly interact with key internal partners to create content, report on current social trends, and interact with the loyal Califia Farms audience, while helping to attract and engage new ones.

Irvine, CA30+ days ago

Remote

Pacvue is seeking an Engagement & Development Summer Intern to support key HR initiatives, including building Confluence resources, enhancing our internal employee learning platform (LearnUpon), and contributing to employee development programs. Focus: Build/organize HR Confluence pages, support the expansion of HR L&D content, and provide overall support on ongoing Engagement initiatives.

Irvine, CA30+ days ago

Remote

Success by the end of the internship will be demonstrated by improved CRM data accuracy, streamlined case routing processes, contributions to revenue initiatives, and the intern's ability to independently manage assigned operational tasks. Support CRM data integrity initiatives, including ensuring contracts are accurately attached and reflected within SFDC opportunities to maintain reporting accuracy and revenue visibility.

Los Angeles, CA30+ days ago

Arrowhead is leading the field in bringing the promise of RNAi to address diseases outside of the liver, and our clinical pipeline includes disease targets in the liver and lung with a promising pipeline of preclinical candidates. Using a broad portfolio of RNA chemistries and efficient modes of delivery, Arrowhead therapies trigger the RNA interference mechanism to induce rapid, deep, and durable knockdown of target genes.

Los Angeles, CA30+ days ago

You'll collaborate with mechanical, software, and simulation engineers to analyze large in-situ data sets and post-print material characteristics, contributing to rapid iteration and continuous improvement of the printing technology using data-driven and machine-learning-enabled approaches. Assist the Process Engineering team in developing a deep understanding of the metal additive process and hardware operation by analyzing massive in-situ data sets to gain insight into physical mechanisms of the printing process.

San Gabriel, CA30+ days ago

We are seeking motivated and enthusiastic individuals who are eager to learn and dedicated to helping our team in providing exceptional services to children diagnosed with autism who are receiving ABA intervention at our beautiful learning center. Learning and Development: Take advantage of countless learning opportunities throughout the internship period and and gain valuable skills and knowledge about developmental learning challenges, treatment assessment and intervention, practice management, health care, and administrative functions.

New!

Los Angeles, CA3 days ago

$100,000–$150,000

If you're pursuing a career in Investment Banking, Private Equity, Capital Markets, or Corporate Finance, this role represents the type of accelerated opportunity we help you land — faster, with personalized recruiter outreach and AI-powered support. This Investment Banking Analyst role is an example of real opportunities available inside the Career Launch AI Private Job Board, which includes: Exclusive roles from employers who recruit directly through Career Launch AI.

Irvine, CA9 days ago

You’ll focus on creating meaningful connections and fun summer experiences with children, while we provide the support of a caring team and opportunities to make a real difference. Be Playful – Spend your summer enjoying games, crafts, outdoor play, and creative activities alongside kids.

Brea, CA30+ days ago

Kirkhill, Inc. a wholly-owned subsidiary of Transdigm, is a leading diversified manufacturer of highly engineered, organic, and in-organic elastomer based products. Optimize all aspects of manufacturing process by identifying opportunities and applying simpler, faster, more cost effective and reliable methods in all phases of manufacturing process.

Los Angeles, CA7 days ago

Note: This position reports to our office in Marina Del Rey, CA and we are not currently looking to hire for any remote positions. This candidate is a self-starter with a passion for marketing, as well as excellent organizational and time-management skills.

Rancho Cucamonga, CA30+ days ago

$18–$20

As a Swim Instructor, you'll teach essential swimming skills, instill confidence, promote a love for swimming, and ensure a safe and supportive learning environment. In this role, you'll provide high-quality swim instruction to individuals or groups, focusing on water safety, stroke development, and overall aquatic skills in Rancho Cucamonga.

Garden Grove, CA28 days ago

You’ll be an essential part of our dynamic workforce as an independent contractor, ready to respond and commute to on-site work opportunities at nearby K-12 schools and nonprofits via the BrightBee app. Instructors also receive ongoing coaching and periodic refresher training (a few hours each semester) to ensure confidence in classroom delivery and continued program quality.

Los Angeles, California17 days ago

$26–$29 Per Hour

Irvine, CA30+ days ago

$54,000–$72,000 Per Year

Current enrolled at an accredited university for the duration of the Internship project pursuing a Bachelor’s degree in Environmental Health and Safety, Environmental Sciences, Occupational Health and Safety, Chemical Engineering, Industrial Engineering, Environmental Science, or a related field. + Day‑to‑day work includes reviewing air quality data, conducting gap and applicability assessments, tracking corrective actions, maintaining documentation, and supporting verification activities.

Irvine, CA30+ days ago

Remote

The Product Marketing Intern will support growth initiatives for Helium 10 Ads by helping execute high priority marketing programs and gathering insights that improve adoption. Pacvue's internship program runs across two 9-week cohorts, and candidates may choose the option that best fits their schedule: Cohort 1 (May 18 – July 17) or Cohort 2 (June 15 – August 14).

New!

Ontario, CA4 days ago

$17–$17.75 Per Hour

Pay Transparency: To encourage pay transparency, promote pay equity, and proactively address regulations, ASICS America Corporation will comply with all applicable state or local laws or regulations which require employers to provide wage or salary range information to job applicants and employees. Position Purpose / Summary Statement: The Team Player is to deliver a great client experience through assessing needs, product education and engaging communication to provide a personalized shopping environment.

Los Angeles, CA10 days ago

$270,000–$400,000

A leading middle-market or upper-middle-market private equity firm is seeking a Senior Associate or VP to drive deal execution, diligence, and portfolio management. Private Equity Senior Associate / Vice President – Career Launch AI Network.

New!

Los Angeles, CA3 days ago

$100,000–$120,000

A Fortune 500 technology company (representative of our employer network) is hiring a Corporate Development Analyst to support M&A sourcing, transaction evaluation, strategy development, and partnership analyses. This Corporate Development Analyst posting is an example of the roles inside our private job board — premium strategy & M&A positions that Career Launch AI members get exclusive access to.

Diamond Bar, CA30+ days ago

$18–$20

As a Summer Swim Instructor, you'll teach essential swimming skills, instill confidence, promote a love for swimming, and ensure a safe and supportive learning environment. In this role, you'll provide high-quality swim instruction to individuals or groups, focusing on water safety, stroke development, and overall aquatic skills in Diamond Bar.

Irvine, CA24 days ago

$26–$47.50 Per Hour

Currently enrolled in an Electrical Engineering (or related) BS, MS or PhD program• Commitment to work onsite for 6 months from June/July to December 2026• Strong desire to learn, grow, and make an impact• Strong career interest in analog circuit design• Willing to share knowledge and collaborate with others• Must have experience with Microsoft Word, Excel, PowerPoint, and Outlook• Experience with Cadence Virtuoso and SPICE is highly preferred• Exposure to lab tools such as Oscilloscope, Function Generator, Multimeter etc.#LI-DJ1The typical pay range for an Engineering intern across the U.S. is currently USD $26.00 - $47.50 per hour and for a Non-Engineering intern across the U.S. is currently USD $22.50 - $42.00 per hour. In this Analog IC Design Summer/Fall Co-Op opportunity at Skyworks, you will learn and participate in developing advanced, state-of-the-art RF front-end modules, working with seasoned engineering professionals and collaborating with subject matter experts within Skyworks.

Irvine, CA30+ days ago

$26–$47.50 Per Hour

At Skyworks, you will find a fast-paced environment with a strong focus on global collaboration, minimal layers of management, and the freedom to make meaningful contributions in a setting that encourages creative thinking. The candidate will support activities that contribute to making forward looking decisions with the demand plan and communicates those decisions to stakeholders including Supply Chain, Marketing, and our external customers.

Irvine, CA30+ days ago

$26–$47.50 Per Hour

This position includes responsibility for both development and sustaining activities: • Explore and Analyze: Dive into ATE test data, generate insightful summary reports, and help uncover trends and conclusions that drive product decisions. At Skyworks, you will find a fast-paced environment with a strong focus on global collaboration, minimal layers of management, and the freedom to make meaningful contributions in a setting that encourages creative thinking.

Irvine, CA30+ days ago

$26–$47.50 Per Hour

At Skyworks, you will find a fast-paced environment with a strong focus on global collaboration, minimal layers of management, and the freedom to make meaningful contributions in a setting that encourages creative thinking. Develop new algorithms or improve existing ones using programming languages such as Python and other visual programming tools such as Knime or Alteryx or Microsoft SSIS.

New!

Irvine, CA1 day ago

$26–$47.50 Per Hour

We are looking for a Supply Chain & Demand Management Summer/Fall Co-Op to join the team in Irvine, CA, for a 6-month period starting in June 2026 and ending in December 2026. The candidate will support activities that contribute to making forward looking decisions with the demand plan and communicates those decisions to stakeholders including Supply Chain, Marketing, and our external customers.

Long Beach, CA30+ days ago

If hired, you will work in person in a schooled-aged camp setting to provide supervision, care, program delivery, and services per Steve & Kate's Camp and Bright Horizons’ policies, procedures and guidance, in compliance with any applicable laws and regulations, and in a manner that will ensure the safety of children in Steve & Kate's Camp's care and the employee. As the youngest campers' lead counselor, you’ll utilize resources provided by S&K to implement and manage the structure of the camp day, manage a team of support staff, and generally make sure that we are meeting all the baseline needs of our little ones.

Irvine, CA30+ days ago

$20–$26 Per Hour

We are changing the game by providing high quality and regularly scheduled supervisory support which help you make a difference in your clients’ lives. Additionally, we’re looking for someone who values work-life balance and want to make meaningful changes to people’s lives in a transparent and rewarding environment.

Los Angeles, CA30+ days ago

$90,000–$95,000 Per Year

You'll work with a talented engineering team from some of the world's most innovative companies on electrical system design, development, and integration efforts across the factory systems, with a specific focus on PCB and compute system design. Demonstrated indicators of excellence and/or achieving success against adversity (i.e. top academic performance, leadership in engineering clubs, first-generation college student, or other examples of resilience and achievement) .

Irvine, CA30+ days ago

Utilize advanced sports science technologies, including external workload tracking, strength testing technology, force plates, and motion capture, to optimize player performance and recovery strategies. Select a relevant player development topic, conduct thorough research, and structure a presentation using visual and interactive elements for senior performance and player development staff.

New!

Pasadena, CA4 days ago

$18.05–$21 Per Hour

With our International Summer Schools, we offer young learners the opportunity to spend 2 - 4 weeks in North America, improving their English language skills in a robust program while participating in a full-activity program of sports, discos, parties, excursions, and lots more! Inspect and maintains swimming and pool equipment for functionality, ensures proper placement and availability in the pool area, and recommends maintenance and repair as needed.

Los Angeles, CA30+ days ago

Interns will gain hands-on exposure to brand strategy, content creation, influencer partnerships, product lifecycle development, and direct-to-consumer operations within a high-growth beauty startup environment. This role will focus on executing day-to-day brand initiatives, supporting influencer and social media strategy, and assisting with product launches and retail efforts.

New!

Irvine, CA1 day ago

$26–$47.50 Per Hour

We are looking for a Supply Chain & Demand Management Summer/Fall Co-Op to join the team in Irvine, CA, for a 6-month period starting in June 2026 and ending in December 2026. At Skyworks, you will find a fast-paced environment with a strong focus on global collaboration, minimal layers of management, and the freedom to make meaningful contributions in a setting that encourages creative thinking.

New!

Los AngelesToday

Part-time

In the past few years, Woodcraft has expanded its menu of services beyond traditional afterschool programs and summer camps to include early learning, environmental and social justice, college access, and inclusion services for youth with intellectual and developmental disabilities. Continuously at the forefront of expanded learning opportunities, Woodcraft Rangers has a rich history of making a significant impact in the greater Los Angeles area, believing that all youth is innately good, deserves the opportunity to realize their full potential, and should be an active participant in defining their own path.

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Summer Jobs in Ontario, CA

Housekeeping Staff (Summer and/or Fall 2026). Live and Work in the Colorado Rockies YMCA of the Rockies

Summer Day Camp Counselor-Intern KE Camps

Summer Day Camp Counselor KE Camps

Summer Camp Unit Head JCCs of North America

Summer Camp Teacher (Internal Candidates Only) Chaminade College Preparatory

Summer Day Camp Director KE Camps

Summer 2025 Engineering Internship TRL11, Inc.

Summer Internship Mortgage Paramount Residential Mortgage Group

Personal Statement Writing Instructor/College Counselor - Summer 2026 Education Unlimited

Summer Day Camp Lifeguard KE Camps

Supply Chain Summer Internship Wayfair

Wonderful Scholar Summer Internship, Agency The Wonderful Company

Construction Finance - Summer Internship Shawmut

Summer 2026 Human Resource Intern Supply Chain - Riverside Kroger Co.

Summer 2026 Human Resource Intern Supply Chain - Riverside Kroger Supply Chain

Summer 2026 Maintenance Intern- Supply Chain Kroger Co.

SAT Instructor - Summer 2026 Education Unlimited

Summer Camp Coach (Counselor) LA - Midcity, West LA, & West Hollywood Areas Got Game Camp

Social Media Summer Intern Califia Farms, LLC

Engagement & Development Summer Intern Pacvue

Revenue Operations Analyst Summer Intern Pacvue

Summer Intern, Medical Publications & Communications Arrowhead Pharmaceuticals

Process Engineering Internship/Co-Op (Summer/Fall 2026) Freeform

2026 Summer Intern (Non-Paid) FirstSteps for Kids, Inc.

Investment Banking Summer Analyst Career Launch AI

Children’s Summer Respite Support Jovie of CA, WA, and MN

Rotation Summer Internship Kirkhill Inc.

Marketing Intern - Summer 2026 Boys Lie

Summer Swim Instructor Premier Swim Academy - Rancho Cucamonga

Summer Camp Group Leader with Rainbow Chef's Academy BrightBee Inc.

Student Architectural Intern | Summer 2026 - Los Angeles Aviation Corgan

Environmental Health and Safety (EHS) Internship, Summer 2026 Edwards Lifesciences

Product Marketing Summer Intern Helium 10

Summer Seasonal Team Player (Sales Associate) - Ontario Asics

Private Equity Senior Summer Associate Career Launch AI

Corporate Development Summer Analyst Career Launch AI

Summer Swim Instructor Premier Swim Academy - Diamond Bar

Analog IC Design Summer/Fall Co-Op (June '26 - Dec '26) (Irvine, CA, US) Skyworks Solutions, Inc

Supply Chain & Demand Management Summer/Fall Co-Op (Irvine, CA, US) Skyworks Solutions, Inc

Product Engineering Summer/Fall Co-Op (Irvine, CA, US) Skyworks Solutions, Inc

Digital Supply Chain Summer/Fall Co-Op (Irvine, CA, US) Skyworks Solutions, Inc

Supply Chain & Demand Management Summer/Fall Co-Op Skyworks Solutions

Summer Camp Youngest Camper Counselor Lead - Long Beach Steve & Kate's Camp

ABA Positions! Hiring ASAP for summer! Part Time Behavior Technicians! POP THERAPIES INC

Electrical Engineer (New Grad Summer 2026) Freeform

Summer 2026 Intern, Performance Excel Sports Management

Lifeguard-Summer EF Education First

Beauty Brand Intern - Summer 2026 Lost Angels

Supply Chain & Demand Management Summer/Fall Co-Op Skyworks

Kinder Camp Leader - Summer Day Camp Castellanos Woodcraft Rangers

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