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Intern Mern Stack Developer Jobs in California (NOW HIRING)

PlusAI

Full Stack Engineer Intern

Santa Clara, CA · On-site

$19 - $65/hr

  • Retirement

Build the Metrics Visualization Hub (Full-Stack): Design and ship an end-to-end web application ... Solid programming fundamentals (e.g., Python, SQL) and experience designing, building, and ...

RocketRide Inc.

AI Developer Intern

San Francisco, CA · On-site

$22.75 - $29.75/hr

About This Role We're searching for an AI Developer Intern for the fall term (mid-Sep through mid ... Hands-on work with cutting-edge agentic AI tools, frameworks, and infrastructure - the real stack ...

Clera

Founding Engineer Intern

San Francisco, CA · On-site

... Intern to join their founding team in San Francisco. You'll work directly with the CTO to ship ... Full-stack focus -- not an ML engineer and not overly specialized in a single language (e.g. Python ...

Clera

Founding Engineer Intern

San Francisco, CA · On-site

... Intern to join their founding team in San Francisco. You'll work directly with the CTO to ship ... Full-stack focus - not an ML engineer and not overly specialized in a single language (e.g. Python ...

Dellfor Technologies

senior .net developer

California City, CA

$67.50 - $85.75/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

NET stack (WISA, WINS) C#, WPF * Recent 1+ years of developing web application in open source stack (MEAN, MERN) * 2+ years of writing code in JS (ES6), JQuery, HTML, CSS, C# * At Least 5+ years of ...

Fluency

Engineering Intern

San Francisco, CA · On-site

$20/hr

About the internship We're hiring an Engineering Intern for a 13-week internship at our San ... Build user-facing features end to end and ship real product to real users, working across the stack ...

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Intern Mern Stack Developer information

What is an intern MERN stack developer?

Intern MERN Stack Developers are entry-level programmers who assist in building web applications using the MERN stack, which stands for MongoDB, Express.js, React.js, and Node.js. As interns, they work under the guidance of senior developers to gain hands-on experience in designing, developing, and deploying full-stack web applications. Their responsibilities typically include writing code, fixing bugs, collaborating with teams, and learning best practices in software development. This role is ideal for those looking to start a career in web development and gain practical experience with modern JavaScript technologies.

What types of projects and tasks can I expect to work on as an intern MERN stack developer?

As an Intern MERN Stack Developer, you will typically participate in projects that involve building and maintaining web applications using MongoDB, Express.js, React, and Node.js. Your daily tasks may include writing and testing code, fixing bugs, developing new features under the guidance of senior developers, and contributing to team meetings. You'll likely collaborate with designers, backend engineers, and QA testers, gaining exposure to the full software development lifecycle. This hands-on experience is valuable for building your technical skills and understanding industry-standard development workflows.

What are the key skills and qualifications needed to thrive as an intern MERN stack developer, and why are they important?

To thrive as an Intern MERN Stack Developer, you need a solid understanding of JavaScript, HTML, CSS, and the core components of the MERN stack: MongoDB, Express.js, React.js, and Node.js, often supported by relevant coursework or self-led projects. Familiarity with version control systems like Git, basic RESTful API development, and optionally cloud platforms or CI/CD tools is valuable. Strong problem-solving skills, eagerness to learn, and effective communication help you collaborate with teams and adapt to new tasks quickly. These skills are crucial for contributing to real-world projects, resolving development challenges, and growing into a proficient full-stack developer.

What is the difference between Intern Mern Stack Developer vs Junior Mern Stack Developer?

AspectIntern Mern Stack DeveloperJunior Mern Stack Developer
Experience LevelEntry-level, internshipEntry to early professional experience
ResponsibilitiesAssisting in development tasks, learning, supporting senior developersDeveloping features, fixing bugs, contributing to projects
Skills & CertificationsBasic knowledge of MERN stack, learning mindsetProficiency in MongoDB, Express.js, React, Node.js, some certifications
Work EnvironmentInternship programs, training-focusedFull or part-time roles in tech teams

The main difference between an Intern Mern Stack Developer and a Junior Mern Stack Developer lies in experience and responsibilities. Interns are typically students or beginners gaining hands-on experience, while Junior developers have some practical skills and contribute more independently. Intern roles focus on learning and support, whereas Junior roles involve active development and problem-solving.

What are the most commonly searched types of Mern Stack Developer jobs in California?

The most popular types of Mern Stack Developer jobs in California are:

What are popular job titles related to Intern Mern Stack Developer jobs in California?

For Intern Mern Stack Developer jobs in California, the most frequently searched job titles are:

What job categories do people searching Intern Mern Stack Developer jobs in California look for?

The top searched job categories for Intern Mern Stack Developer jobs in California are:

What cities in California are hiring for Intern Mern Stack Developer jobs?

Cities in California with the most Intern Mern Stack Developer job openings:

Intern Mern Stack Developer jobs near you
Infographic showing various Intern Mern Stack Developer job openings in California as of August 2026, with employment types broken down into 50% Full Time, and 50% Part Time. Highlights an 100% In-person job distribution.

Full Stack Engineer Intern

PlusAI

Santa Clara, CA • On-site

$19 - $65/hr

Full-time, Internship

Retirement

This job post has expired today. Applications are no longer accepted.

Job description

PlusAI is a Physical AI company pioneering AI-based virtual driver software for factory-built autonomous trucks. Headquartered in Silicon Valley with operations in the United States and Europe, Plus was named by Fast Company as one of the World's Most Innovative Companies. Partners including TRATON GROUP's Scania, MAN, and International brands, Hyundai Motor Company, Iveco Group, Bosch, and DSV are working with Plus to accelerate the deployment of next-generation autonomous trucks. If you're ready to make a huge impact and drive the future of autonomy, Plus is looking for talented individuals to join its fast-growing teams.
Responsibilities:

  • Build the Metrics Visualization Hub (Full-Stack): Design and ship an end-to-end web application - front-end dashboards through back-end services - that makes autonomous-vehicle product metrics, route analytics, and pipeline health easy to explore for engineering and operations teams.

  • Deliver Low-Latency Data Access: Build a caching and pre-aggregation layer to reduce latency in result fetching

  • Optimize the Metrics Calculation Pipeline: Profile, refactor, and scale the back-end pipelines that compute product metrics, operation summaries, and route extractions - improving throughput, controlling cost, and strengthening the correctness of derived measures.

  • Develop the Metrics Validation Process: Build and automate validation tooling that cross-checks pipeline outputs against source-of-truth references, flags discrepancies, and gates bad data before it reaches downstream consumers - turning manual triage into a repeatable, alert-driven workflow.

Required Skills:

  • Full-Stack Web Development: Strong proficiency building modern web applications end-to-end - front-end frameworks (e.g., React/TypeScript) and back-end services/APIs (e.g., Python/FastAPI) - with an eye for clean, responsive, data-rich interfaces.

  • Backend & Data Pipeline Development: Solid programming fundamentals (e.g., Python, SQL) and experience designing, building, and maintaining data processing pipelines and the services.

  • Performance & Scalability: Ability to analyze code, system architecture, and data pipelines to improve execution speed and resource efficiency, including caching and pre-aggregation strategies for low-latency data access.

Preferred Skills:

  • Working with Large Datasets: Experience handling and processing high volumes of structured and time-series data, with strong SQL skills and familiarity with relational and/or columnar databases.

  • Big Data Processing: Hands-on experience with distributed processing frameworks such as PySpark for large-scale data pipelines.

  • Domain Exposure: Familiarity with autonomous vehicles, robotics, or other sensor/telemetry-heavy data environments.

$19 - $65 an hour
Our internship hourly rates are a standard pay determined based on the position and your location, year in school, degree, and experience.
Your opportunities joining PlusAI
Work, learn and grow in a highly future-oriented, innovative and dynamic field.
Wide range of opportunities for personal and professional development.
Catered free lunch, unlimited snacks and beverages.
Highly competitive salary and benefits package, including 401(k) plan.
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
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