Internships in Castro Valley, California, United States

Externship Opportunities at VetnCare offer veterinary students a 2‑week, hands‑on experience in a supportive clinical environment. Interns shadow veterinarians, observe diagnostics, treatment planning, and case management, and gain exposure to surgery, dentistry, urgent care, and exotic animal medicine.

Uline seeks a motivated college student for a paid summer internship in outside sales. The role offers hands‑on experience selling to diverse industries, weekly training, mentorship, and a phone and car allowance.

Apprentice Teacher Assistants support YMCA Early Childhood Impact centers across the East Bay, providing high‑quality care and instructional assistance to children of all abilities. In this on‑site apprenticeship, candidates help lead classroom activities, supervise children, assist with meal service, and maintain safe learning environments.

The Store Assets Protection Executive Intern (Store Leadership Intern) role offers a summer internship in the Greater Bay Area, California, where interns work closely with a mentor to learn the AP business area and other team functions within Target stores. Interns will manage a security culture, including crisis response, safety environment, and crowd management planning, execute strategic AP strategies and goals, identify and develop resolutions for external theft and fraud, conduct internal a

Fuse is pioneering fusion energy, building Titan, a next‑generation fusion generator. As an intern, you’ll work on the R&D team in San Leandro, contributing to design, testing, and integration of cutting‑edge components.

Fuse is pioneering fusion energy, aiming to deliver limitless, clean power by replicating the sun’s process. As an intern, you’ll join the Titan project, helping build the next‑generation fusion generator.

Target Data & Analytics team builds data pipelines to support business insights. As an ETL Intern you will assist in designing, developing, and testing data extraction and transformation processes, collaborating with senior engineers to ensure data quality.

Are you seeking a dynamic, fast-paced paid internship? The Office of California Senator Jerry Mc Nerney is looking for enthusiastic and motivated individuals to join our team.

Store Executive Intern (Store Leadership Intern) is a paid 40‑hour/week internship that provides hands‑on training in retail store leadership. Interns lead teams, drive guest experience, manage sales and merchandising, and learn operational performance.

Indie Campers seeks a Tourism & Operations Intern to join our San Francisco Depot. The role offers hands‑on experience in RV and campervan rentals, covering front‑office customer service, sales, and back‑office operations such as reservation alignment, vehicle preparation, quality control, and fleet coordination.

This internship offers students hands‑on experience in software development, covering the full lifecycle from requirement analysis to deployment and maintenance. Students will collaborate with cross‑functional teams, write code, test, and troubleshoot applications while learning industry best practices and emerging technologies.

Software Developer Internship at BMO Capital Markets offers students a chance to immerse in the full software development lifecycle within a dynamic financial technology environment. Interns collaborate with cross‑functional teams to transform business requirements into robust, secure applications, leveraging modern cloud, microservices, and API‑driven architectures.

Protiviti Applications department at Robert Half is building AI‑driven applications to shape the company’s technological future. The intern designs, develops, and maintains generative AI apps, uses RAG and prompt engineering, evaluates LLM outputs, and communicates results to stakeholders.

Protiviti Applications department at Robert Half is building generative AI applications to power enterprise solutions. The intern designs, develops, and evaluates LLM‑based conversational agents using RAG, prompt engineering, and embeddings.

Learning & Development team at Milestone Technologies supports employee growth through training programs and analytics. The intern coordinates training assignments, manages LMS access requests, maintains learning records, and creates reports on training completion and utilization.

Unpaid internship with City of Huntsville offering students in technical, public administration, or business fields hands‑on experience. Interns work across city departments, performing research, data collection, report writing, and stakeholder interviews.

Core Technology team at Rondo Energy develops high‑temperature heat battery platforms for industrial decarbonization. The intern supports thermal and fluid performance analyses using 1D simulation tools, builds steady‑state and transient thermal models, and validates results against test data.

People Team at Astra offers an internship program for incoming sophomores, juniors, and seniors across engineering and business disciplines. Interns contribute to spacecraft and launch vehicle design, systems engineering, CAD modeling, analysis, testing, and documentation while working alongside senior engineers.

Kairos Power's Engineering teams in Salt Chemistry, Fuels, and Materials are advancing nuclear energy solutions. Interns will collaborate on chemical, materials, and process engineering projects, conducting experiments, data analysis, and documentation while gaining hands‑on experience in labs and manufacturing settings.

Franklin Templeton is recruiting an Undergraduate Summer Intern for the US Fund Admin & Oversight team. The internship, based in Stamford, Connecticut with additional locations in Rancho Cordova, Ft. Lauderdale, San Ramon, and San Mateo, requires interns to work on-site full‑time (approximately 37.5 hours per week).