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Entry Level Junior Software Engineer Jobs in California

Mechanize

Junior Software Engineer

San Francisco, CA

$144.23/hr

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Rafael, CA

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Francisco, CA · On-site

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Bruno, CA

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Francisco, CA · On-site

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

Pacifica, CA

$144.23/hr

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

Oakland, CA

$144.23/hr

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Francisco, CA · On-site

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Francisco, CA · On-site

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Francisco, CA · On-site

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

Daly City, CA

$144.23/hr

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

Daly City, CA

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

South San Francisco, CA

$144.23/hr

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Francisco, CA

$144.23/hr

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Francisco, CA

$144.23/hr

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Francisco, CA

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Leandro, CA

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

Alameda, CA

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Francisco, CA

$144.23/hr

  • Medical

  • Dental

  • Vision

  • Life

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 ...

Mechanize

Junior Software Engineer

San Francisco, CA

  • Medical

  • Dental

  • Vision

  • Life

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 ...

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Entry Level Junior Software Engineer information

What does an entry level junior software engineer do?

An Entry Level Junior Software Engineer is typically responsible for assisting with designing, coding, testing, and maintaining software applications under the supervision of more experienced engineers. They often work on fixing bugs, writing simple code modules, and learning about the company's software development processes. This role is a starting point for new graduates or individuals with limited professional experience, allowing them to build foundational skills and gain exposure to real-world software projects.

What are the key skills and qualifications needed to thrive as an entry level junior software engineer?

To thrive as an Entry Level Junior Software Engineer, you need a solid understanding of programming fundamentals, algorithms, and data structures, typically supported by a degree in computer science or a related field. Familiarity with common programming languages (such as Java, Python, or JavaScript), version control systems like Git, and basic knowledge of software development tools is essential. Strong problem-solving skills, attention to detail, and effective communication set standout candidates apart. These skills and qualities are crucial for successful collaboration, writing reliable code, and contributing effectively to team-based software projects.

What are some common challenges faced by entry level junior software engineers during their first year on the job?

Entry Level Junior Software Engineers often encounter the challenge of adapting to new codebases and development tools, which may differ significantly from what they've used in school or internships. They may also find it difficult to estimate task durations or understand complex requirements without prior experience. Frequent collaboration with senior engineers and participating in code reviews can help accelerate learning and build confidence. Over time, mastering effective communication and time management becomes essential for success in fast-paced development environments.

What is the difference between Entry Level Junior Software Engineer vs Software Developer?

AspectEntry Level Junior Software EngineerSoftware Developer
Required CredentialsBachelor's in CS or related field; some internshipsBachelor's in CS or related field; coding experience
Work EnvironmentTeam-based, collaborative projects, entry-level tasksProject-focused, coding, debugging, and implementation
Employer & Industry UsageTech companies, startups, IT departmentsSoftware firms, tech startups, enterprise IT
Common Search & ComparisonYesYes

Entry Level Junior Software Engineers and Software Developers often share similar educational backgrounds and work environments. The main difference lies in job focus: engineers may be involved in designing systems and architecture, while developers typically focus on coding and implementation. Both roles are common in tech industries and often overlap in entry-level positions, making them frequently compared by job seekers.

Can I become an entry level junior software engineer with no experience?

Entry level junior software engineer positions often require some foundational knowledge of programming languages such as Python, Java, or C++, and familiarity with development tools. While prior work experience is not always necessary, demonstrating coding skills through projects, internships, or certifications can improve your chances of securing an entry-level role.

Is 25 too late to become an entry level junior software engineer?

Entry level junior software engineer roles are open to individuals of various ages, including those starting their careers at 25 or later. Many employers value skills, relevant training, and a willingness to learn over age, and career changers often successfully transition into these roles by gaining programming skills through courses, certifications, or self-study.

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

The most popular types of Junior Software Engineer jobs in California are:

What are popular job titles related to Entry Level Junior Software Engineer jobs in California?

For Entry Level Junior Software Engineer jobs in California, the most frequently searched job titles are:

What job categories do people searching Entry Level Junior Software Engineer jobs in California look for?

The top searched job categories for Entry Level Junior Software Engineer jobs in California are:

What cities in California are hiring for Entry Level Junior Software Engineer jobs?

Cities in California with the most Entry Level Junior Software Engineer job openings:

Entry Level Junior Software Engineer jobs near you
Infographic showing various Entry Level Junior Software Engineer job openings in California as of August 2026, with employment types broken down into 1% As Needed, 90% Full Time, 6% Part Time, and 3% Contract. Highlights an 87% Physical, 4% Hybrid, and 9% Remote job distribution.

Junior Software Engineer

Mechanize

San Francisco, CA

$144.23/hr

Full-time

Medical, Dental, Vision, Life

Re-posted yesterday

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.

Apply