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Software Development Intern Jobs in Fairfield, CA

Pylon Labs

Software Engineer, Intern

San Francisco, CA · On-site

... for software development and can juggle multiple workstreams at the same time. * (Bonus) You have experience with our tech stack (React, Golang, GraphQL, and AWS). Our Perks Commuter benefits ...

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All JobsSoftware Development Intern JobsSoftware Development Intern Jobs in Fairfield, CA

Software Development Intern information

See Fairfield, CA salary details

$11

$23

$40

How much do software development intern jobs pay per hour?

As of Sep 13, 2026, the average hourly pay for software development intern in Fairfield, CA is $23.30, according to ZipRecruiter salary data. Most workers in this role earn between $18.85 and $24.71 per hour, depending on experience, location, and employer.

What types of projects and tasks can a software development intern expect to work on during their internship?

As a Software Development Intern, you can expect to contribute to real-world projects such as developing new features, fixing bugs, assisting with code reviews, and writing documentation. Interns often work closely with experienced developers, participate in agile team meetings, and may be involved in testing and deploying software. The tasks assigned are designed to build your technical skills, expose you to collaborative workflows like version control with Git, and provide valuable experience in a professional software engineering environment.

What are the key skills and qualifications needed to thrive as a software development intern, and why are they important?

To thrive as a Software Development Intern, you need a foundational understanding of programming languages (such as Python, Java, or C++), problem-solving skills, and a relevant academic background in computer science or a related field. Familiarity with version control tools like Git, integrated development environments (IDEs), and basic software development methodologies is typically expected. Strong communication, eagerness to learn, and teamwork skills help interns stand out by allowing them to collaborate effectively and adapt to feedback. These skills and qualities are crucial for contributing to real-world projects, gaining valuable experience, and growing within a professional development environment.

What is the difference between Software Development Intern vs Software Engineer?

AspectSoftware Development InternSoftware Engineer
CredentialsTypically pursuing or recent graduate of a computer science or related degreeBachelor's or higher in computer science or related field, with professional experience
Work EnvironmentTemporary, internship-based, often part-time or summer rolesFull-time, permanent positions in various industries
Employer & Industry UsageUsed by tech companies, startups, and organizations offering internship programsUsed across all industries requiring software development
Search & Comparison IntentPeople exploring entry-level or internship opportunities in software developmentIndividuals seeking full-time software engineering roles

In summary, a Software Development Intern is an entry-level, temporary role aimed at gaining experience, while a Software Engineer is a full-time professional position requiring more experience and responsibility. The internship provides a pathway into the industry, whereas the engineer role involves ongoing project work and career development.

What does a software development intern do?

A software development intern assists in designing, coding, testing, and debugging software applications under the supervision of experienced developers. They often work with programming languages like Java, Python, or C++, and may use tools such as version control systems and development environments to contribute to ongoing projects.

What cities near Fairfield, CA are hiring for Software Development Intern jobs?

Cities near Fairfield, CA with the most Software Development Intern job openings:

Software Development Intern jobs near you
Infographic showing various Software Development Intern job openings in Fairfield, CA as of September 2026, with employment types broken down into 8% Internship, 75% Full Time, and 17% Temporary. Highlights an 92% In-person, and 8% Remote job distribution, with an average salary of $48,463 per year, or $23.3 per hour.

Software Engineer - Intern

San Francisco, CA • On-site

Kastle AI Inc
See more jobs at Kastle AI Incexternal

Full-time

Re-posted 7 days ago

Job description

About Kastle
Kastle is building the AI employee for consumer lending. We work with some of America's largest banks and mortgage lenders, helping them scale their contact center and compliance operations using autonomous AI Agents that process payments, originate loans, and help customers get a world class experience during the biggest financial decisions of their lives. We've processed over $1 billion in transactions and are backed by Y Combinator and Commerce Ventures. If you are interested in building AI that is applied in the real world where precision, reliability, and performance matter and redefine access to credit across the world, apply below.
About the Role
We're looking for a Software Engineer Intern who is excited to build products that are used by millions of users every month. As an intern, you won't spend your summer fixing minor bugs or working on isolated projects-you'll work alongside experienced engineers to design, build, and ship production software and AI Agents that is deployed at some of the world's largest banks.
You'll join a small, fast-moving team where you'll have real ownership, receive frequent feedback, and learn how software is built from idea to deployment.
If you're curious, enjoy solving difficult problems, and want to grow as an engineer by building meaningful products, we'd love to meet you.
What You'll Do
  • Ship agent capabilities that run in production at national banks and servicers
  • Contribute to evals and QA harnesses that catch failure modes and makes reliable AI scale in production
  • Work with the latest voice and language models - latency, interruption handling, grounding, tool use - and integrate them into enterprise environments
  • Sit in on real customer calls and learn directly from executives and how AI gets deployed in the real world
  • Contribute to technical documentation and internal tooling.

What We're Looking For
  • Currently pursuing or recently completed a Bachelor's / Master's / Bootcamp degree in Computer Science, Software Engineering, or a related field.
  • Strong programming fundamentals in at least one language such as Python, Java, Go, JavaScript, TypeScript, or C++.
  • Experience building personal projects, coursework, hackathon projects, or previous internships.
  • Familiarity with web development, APIs, databases, or cloud platforms is a plus.
  • Strong problem-solving skills and attention to detail.
  • Comfortable working in a collaborative, fast-paced environment.
  • Eager to learn, ask questions, and continuously improve.
Bonus Points
  • Experience building agents that operate in realtime settings
  • Interest in consumer lending, banking, or financial services
What You'll Gain
  • A rare opportunity to contribute to a company that will redefine an entire industry
  • Hands-on experience building software used by real customers.
  • Mentorship from experienced engineers.
  • Exposure to the full software development lifecycle-from planning to production.
  • Opportunities to own meaningful projects and present your work.
  • A collaborative team environment focused on learning, growth, and impact.

Apply