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Junior Developer Startup Jobs in California (NOW HIRING)

Monarch Quantum

Mechanical Engineer 3

San Diego, CA · On-site

$125K - $175K/yr

Will mentor junior engineers. * Execute complex engineering tasks involving planning, preparation ... Minimum of 5 years of relevant experience, ideally within a startup or technology company. Skills:

Monarch Quantum

Mechanical Engineer 3

San Diego, CA

$125K - $175K/yr

Will mentor junior engineers. * Execute complex engineering tasks involving planning, preparation ... Minimum of 5 years of relevant experience, ideally within a startup or technology company. Skills:

Monarch Quantum

Mechanical Engineer 3

San Diego, CA · On-site

$125K - $175K/yr

Will mentor junior engineers. * Execute complex engineering tasks involving planning, preparation ... Minimum of 5 years of relevant experience, ideally within a startup or technology company. Skills:

Vyro

Junior Content Creator

San Francisco, CA · On-site

$144K - $150K/yr

We're looking for an ambitious Junior Content Creator who wants to build a career in content ... This is an opportunity to develop your creative skills, gain exposure to a fast-growing startup ...

Embedding VC

Sr. Motion Planning Engineer

Fremont, CA · On-site

$114K - $157K/yr

Anyware Robotics is a fast-paced startup backed by world-class VCs. Empowered by the latest ... Maintain high-standard software development practices and mentor and guide junior developers Skills ...

SecurityPal

Senior Software Engineer

San Francisco, CA

$170K - $200K/yr

We're a post-Series A startup backed by world-class investors, already profitable, and growing fast ... Champion best practices in code quality, system design, and DevOps automation * Mentor junior ...

8848M LLC

Senior Software Engineer

San Francisco, CA · On-site

$170K - $190K/yr

We're a post-Series A startup backed by world-class investors, already profitable, and growing fast ... Champion best practices in code quality, system design, and DevOps automation * Mentor junior ...

Arbor Energy

Lead Combustion Engineer

El Segundo, CA

$170K - $185K/yr

... startup environment. You'll drive strategy from clean-sheet concepts and advanced modeling through ... You'll mentor junior engineers, align cross-functional efforts with test, analysis, and design ...

TetraMem Inc

CAD Engineer

San Jose, CA · On-site

$110K - $250K/yr

Mentor and provide technical guidance to junior engineers, fostering a culture of continuous ... Ability to work in a startup environment and to work both independently and as a team player The ...

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All JobsDeveloper Startup JobsJunior Developer Startup JobsJunior Developer Startup Jobs in California

Junior Developer Startup information

See California salary details

$23.7K

$87.8K

$135.7K

How much do junior developer startup jobs pay per year?

As of Jul 27, 2026, the average yearly pay for junior developer startup in California is $87,810.00, according to ZipRecruiter salary data. Most workers in this role earn between $66,100.00 and $85,900.00 per year, depending on experience, location, and employer.

What is a Junior Developer Startup job?

A Junior Developer Startup job involves working as an entry-level software developer in a fast-paced startup environment. You'll likely assist in coding, debugging, and testing software while collaborating with a small team. Startups often require developers to be adaptable, learn quickly, and take on various responsibilities beyond coding. This role provides great exposure to modern technologies and agile development practices. It’s a valuable opportunity to grow your skills and gain hands-on experience in a dynamic setting.

What are the key skills and qualifications needed to thrive in the Junior Developer Startup position, and why are they important?

To thrive as a Junior Developer at a startup, you need foundational knowledge of programming languages (such as JavaScript, Python, or Ruby), basic understanding of web development, and a degree in computer science or related experience. Familiarity with source control systems like Git, cloud services, and popular frameworks is important, and participation in coding bootcamps or relevant certifications is a plus. Strong problem-solving, adaptability, and effective communication are key soft skills for collaborating in a dynamic, fast-paced environment. These abilities help junior developers quickly learn, contribute to product development, and grow within the rapidly evolving startup landscape.

What are some common challenges a Junior Developer may face when working at a startup?

Junior Developers in startup environments often encounter rapid changes in project direction, shifting priorities, and the need to learn new technologies quickly. Unlike more established companies, startups may have less formalized onboarding and training, requiring you to take initiative and learn on the go. You'll likely collaborate closely with small, cross-functional teams, which means communication skills and flexibility are essential. Embracing these challenges can accelerate your growth, expand your technical skill set, and offer opportunities to make a direct, visible impact on the company's products.

What are the most commonly searched types of Developer Startup jobs in California? The most popular types of Developer Startup jobs in California are:
What are popular job titles related to Junior Developer Startup jobs in California? For Junior Developer Startup jobs in California, the most frequently searched job titles are:
What job categories do people searching Junior Developer Startup jobs in California look for? The top searched job categories for Junior Developer Startup jobs in California are:
What cities in California are hiring for Junior Developer Startup jobs? Cities in California with the most Junior Developer Startup job openings:
Junior Developer Startup jobs near you
Infographic showing various Junior Developer Startup job openings in California as of July 2026, with employment types broken down into 100% Full Time. Highlights an 100% In-person job distribution, with an average salary of $87,810 per year, or $42.2 per hour.

Mechanical Engineer 3

Monarch Quantum

San Diego, CA • On-site

$125K - $175K/yr

Full-time

Medical, Dental, Vision, Retirement, PTO

Posted 12 days ago

Job description

Join our fast-paced and passionate team as a Mechanical Engineer 3. As we scale, you will be instrumental in building our foundation from the ground up. This is a dynamic, hands-on role for a self-starter who thrives in a fluid startup environment. You'll have the opportunity to work on cutting edge technologies, work closely with leadership, and develop and implement engineering practices that support our mission and growth. Your key responsibilities are as follows:

  • Work independently and in a team while over communicating with the manager, project engineer and the teammates. Will mentor junior engineers.
  • Execute complex engineering tasks involving planning, preparation, data/information collection and analysis and decision-making in a process involving peer reviews and documentation of the results.
  • Use tenacity, patience, self-discipline and passion for excellence to assure accuracy of execution schedule, data quality/integrity, conformance to company best practices, clarity in communication and documentation.
  • Use every opportunity to grow competency thru mentorship, curiosity, communication, exposure and initiative.

Requirements

  • This position requires access to export-controlled information. Employment is contingent upon the applicant being a U.S. person as defined by 8 U.S.C. § 1324b(a)(3).

Experience:

  • A bachelor’s degree in mechanical engineering, Physics, or a related field.
  • Minimum of 5 years of relevant experience, ideally within a startup or technology company.

Skills:

  • Deep working knowledge of multiple ME topics and strong understanding of standard mechanical engineering degree curriculum.
  • Deep understanding of material properties, mechanisms, fabrication methods: CNC milling, CNC turning, sheet metal, injection molding, laser cutting, water jet cutting, and 3D printing (metal and plastic).
  • Deep understanding of designing for photonic assembling methods: Die bonding, vacuum reflow soldering, wire-bonding, adhesives, etc.
  • Deep understanding of structural theory: static, modal, random vibration, shock, etc.
  • Deep understanding of fluids and heat transfer theory: conduction, convection and radiation.
  • Demonstrated successful execution of engineering tasks including use of mechanical CAD (SolidWorks preferred) and quantitative analysis/programming tools (Python), instrumentation and measurement, part fabrication or procurement, integration and test, data collection, analysis (ANSYS Workbench) and documentation.

Startup Mindset:

  • You're creative, flexible, and eager to wear multiple hats.
  • You're passionate about building systems from the ground up and comfortable with ambiguity and change.

Benefits

The expected annual salary range for this position is $125,000-$175,000.

As a full-time employee, you will be eligible for Monarch’s comprehensive benefits package, which includes:

  • Medical, Dental, and Vision insurance
  • Fidelity 401(k) plan with 4% employer matching
  • 20 paid time off (PTO) days per year
  • 13 paid company holidays
  • 9/80 work schedule (every other Friday off)


Monarch Quantum is proud to be an equal opportunity employer and does not discriminate on the basis of race, color, citizenship status, national origin, ancestry, sex, sexual orientation, age, religion, creed, physical or mental disability, medical condition, marital status, veteran status or any other characteristics protected under applicable federal, state and local laws.