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Junior Software Jobs in California (NOW HIRING)

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading ...

Showing results 41-60

Junior Software information

What does a junior software engineer do?

A Junior Software Engineer assists in designing, developing, and maintaining software applications under the guidance of senior team members. They typically write and review code, fix bugs, and collaborate with other engineers to implement new features or improve existing ones. Junior Software Engineers are also expected to learn and adapt to new technologies, follow best coding practices, and participate in code reviews. Their role is essential in supporting project development and gaining hands-on experience to advance their careers.

What are some common challenges faced by junior software engineers when transitioning from academic projects to real-world development teams?

Junior Software Engineers often find that real-world development involves more complex codebases, collaborative workflows, and the use of industry-standard tools, which can be quite different from academic projects. Adapting to agile methodologies, participating in code reviews, and learning to communicate effectively with cross-functional teams are typical challenges. Additionally, juniors may need to quickly get up to speed with version control systems and continuous integration tools, all while balancing learning with delivering work on tight deadlines. Supportive mentors and structured onboarding can help ease this transition.

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

To thrive as a Junior Software Developer, you need a solid understanding of programming languages (such as Java, Python, or JavaScript), problem-solving skills, and typically a degree in computer science or related field. Familiarity with version control systems like Git, basic knowledge of databases, and exposure to IDEs and debugging tools are commonly required. Strong communication, eagerness to learn, and the ability to work collaboratively help set you apart in this entry-level position. These skills and qualities are crucial for effectively contributing to development projects, adapting to evolving technologies, and supporting team goals.

What are the most commonly searched types of Software jobs in California?

The most popular types of Software jobs in California are:

What cities in California are hiring for Junior Software jobs?

Cities in California with the most Junior Software job openings:

Infographic showing various Junior Software job openings in California as of August 2026, with employment types broken down into 88% Full Time, 10% Part Time, and 2% Contract. Highlights an 88% Physical, 3% Hybrid, and 9% Remote job distribution.

Junior Software Engineer

Mechanize

South San Francisco, CA

Full-time

Medical, Dental, Vision, Life

Re-posted 17 days ago


Job description

About Mechanize

Mechanize builds reinforcement learning environments that frontier AI labs use to train and evaluate their coding models. Learn more at mechanize.work.

Why the work matters

AI models have gotten good at narrow coding tasks but still fail at the complex, judgment-heavy parts of software engineering. We build the environments that expose those failures and help models improve.

What you'll do

You'll design, build, and refine RL tasks. Each task is a self-contained software engineering challenge with a prompt, an environment, and an automated grader. You own the full lifecycle: coming up with the idea, implementing the grading infrastructure, running frontier models against the task, analyzing where and why they fail, and iterating until the task is rigorous and fair.

Coming up with good task ideas requires being clever: finding situations where a frontier model will fail in interesting ways, which means seeing gaps that the model itself doesn't see. You will use coding agents heavily, and a large part of the job is directing them well, evaluating their output, and knowing when they are failing in subtle ways.

What makes someone good at this

Strong technical fundamentals combined with an intuition for AI model behavior. You need to anticipate where a model will take shortcuts, distinguish genuine capability gaps from grader issues, and understand how a model will interpret a prompt. Most engineers significantly underestimate what frontier coding agents can already do; candidates who have spent significant time working with them will have a real head start.

Good fit if you:

  • Have just graduated or are about to graduate

  • Can code in Python

  • Are confident working independently

  • Are motivated by problems that require both technical skill and creative cleverness

  • No prior ML or AI experience required

We're happy to hire candidates who are very capable, even if they have no prior professional software experience.

Probably not a good fit if you:

  • Want a product engineering role building features for end users

  • Prefer a highly collaborative team environment with shared ownership

  • Want extensive structured mentorship

This is independent, high-ownership work. You own your tasks from start to finish, with regular check-ins and feedback. Strong performers are recognized and promoted quickly. Benefits include health, dental, vision, and life insurance. Applying takes less than one minute.

Interview process: https://www.mechanize.work/how-our-interview-process-works

Learn more about the work: https://www.mechanize.work/what-working-here-is-like

About Mechanize. ~20 person team in San Francisco. Backed by Patrick Collison, Nat Friedman, Daniel Gross, Jeff Dean, Dwarkesh Patel, and Sholto Douglas. Featured in the New York Times, the Dwarkesh Podcast and Hard Fork.