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Freelance Full Stack Engineer Jobs in California

Wonderschool

Full Stack Engineer

San Francisco, CA · On-site

$180K - $220K/yr

As a Senior Full Stack Engineer, you will own features end-to-end, working across frontend, backend, and data layers to deliver high-quality, scalable products. You will operate as a builder ...

Staffingine LLC

Full stack engineer

Newark, CA · On-site

Job Title: Full stack engineer Job Location: Newark - California Job Type: Contract * Handson experience with React or Angular NodeJs ExpressNestJs and MongoDB * Handson experience with ...

Wonderschool

Full Stack Engineer

San Francisco, CA

$180K - $220K/yr

As a Senior Full Stack Engineer, you will own features end-to-end, working across frontend, backend, and data layers to deliver high-quality, scalable products. You will operate as a builder ...

NeoSigma

Full-stack engineer

San Francisco, CA · On-site

They are seeking a Full-stack Engineer to build scalable systems, develop backend services, and create high-quality frontend experiences while collaborating with customers and internal teams.

1 point system

Full Stack Engineer

Fremont, CA · On-site

$50 - $55/hr

Job Title Full Stack Engineer 3-5+ years (Mid-level) - Preferable less than 10 years experience Duration 6 Months+ Contract to Hire Location 100% onsite 901 Page Ave. Fremont, CA * 40 hours/week - NO ...

Nash, Inc.

Full Stack Engineer

San Francisco, CA · On-site

Full Stack Engineer San Francisco / Hybrid/Remote About Nash Logistics is the substrate beneath every economy that has ever existed, and it remains the least intelligently coordinated activity in the ...

Stellar IT Group

Full Stack Engineer

Fremont, CA · On-site

Mid-Level Full Stack Engineer 6+ months (CTH) Fremont, CA (ONSITE) Core Technical Expertise (Hands-On) * Proven experience in C# / .NET back-end development for production systems. * Strong Angular ...

Mercator

Full-Stack Engineer

San Francisco, CA · On-site

The Full-Stack Engineer will design and develop user-friendly interfaces for a simulation platform, transforming complex operational decisions into simple, intuitive experiences while collaborating ...

Max AI, Inc.

Full-Stack Engineer

San Francisco, CA · On-site

$140K - $220K/yr

Full Stack Engineer Responsibilities * Taking ownership of the entire product lifecycle-from initial concept to final deployment. * Creating scalable and reliable solutions aimed at optimizing ...

Knightscope

Full Stack Engineer

Sunnyvale, CA · On-site

The ideal candidate brings full stack engineering expertise, a deep understanding of the Secure Software Development Lifecycle (SSDLC), and hands-on experience integrating large language models and ...

Knightscope, Inc.

Full Stack Engineer

Sunnyvale, CA · On-site

$175K - $200K/yr

The ideal candidate brings full stack engineering expertise, a deep understanding of the Secure Software Development Lifecycle (SSDLC), and hands-on experience integrating large language models and ...

Hired Recruiters

Full Stack Engineer

Palo Alto, CA · On-site

$100K - $160K/yr

We are looking for our first full-stack engineer to work with us to continue building out our product and deploy it to some of the largest insurance carriers in the world. There's so much to do. We ...

Knightscope, Inc.

Full Stack Engineer

Sunnyvale, CA · On-site

The ideal candidate brings full stack engineering expertise, a deep understanding of the Secure Software Development Lifecycle (SSDLC), and hands-on experience integrating large language models and ...

1 point system

Senior Full-Stack Engineer

Irvine, CA · On-site

Requirement - Senior Full-Stack Engineer Location- Irvine, CA Contract W2 Overview We are seeking a Senior Full-Stack Engineer to support the development of internal Incident Management Tools used by ...

Knightscope

Full Stack Engineer

Sunnyvale, CA · On-site

The ideal candidate brings full stack engineering expertise, a deep understanding of the Secure Software Development Lifecycle (SSDLC), and hands-on experience integrating large language models and ...

Knightscope

Full Stack Engineer

Sunnyvale, CA · On-site

The ideal candidate brings full stack engineering expertise, a deep understanding of the Secure Software Development Lifecycle (SSDLC), and hands-on experience integrating large language models and ...

Max AI, Inc.

Full-Stack Engineer

San Francisco, CA

$140K - $220K/yr

Full Stack Engineer Responsibilities * Taking ownership of the entire product lifecycle-from initial concept to final deployment. * Creating scalable and reliable solutions aimed at optimizing ...

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Freelance Full Stack Engineer information

What are the key skills and qualifications needed to thrive as a freelance full stack engineer?

To thrive as a Freelance Full Stack Engineer, you need strong proficiency in both front-end and back-end programming languages (such as JavaScript, HTML/CSS, Node.js, and Python) and a solid understanding of database management and web architecture. Familiarity with frameworks like React, Angular, or Django, version control systems like Git, and cloud platforms is often required, and certifications (e.g., AWS Certified Developer) can be advantageous. Excellent problem-solving, time management, and client communication skills help set you apart in a competitive freelance environment. These skills and qualities are crucial for delivering high-quality, end-to-end solutions while managing multiple projects and maintaining client satisfaction.

What are some common challenges faced by freelance full stack engineers when managing multiple projects simultaneously?

Freelance full stack engineers often juggle several projects at once, which can lead to challenges such as balancing client expectations, managing time effectively, and ensuring consistent code quality across different tech stacks. Communication is key, as freelancers must regularly update clients and coordinate with other team members who may be working remotely. Staying organized with project management tools and setting clear boundaries for deliverables and timelines can help mitigate these challenges, allowing engineers to deliver high-quality work while maintaining healthy client relationships.

What is the difference between Freelance Full Stack Engineer vs Freelance Front End Developer?

AspectFreelance Full Stack EngineerFreelance Front End Developer
SkillsProficient in both front-end and back-end technologies (e.g., HTML, CSS, JavaScript, Node.js, databases)Specializes in front-end technologies (e.g., HTML, CSS, JavaScript, frameworks like React or Angular)
Work EnvironmentHandles entire project development, often working on both client and server sidesFocuses on user interface and experience, primarily on the client side
Common UsageUsed in projects requiring full-stack development, versatile rolesUsed in projects emphasizing UI/UX design and front-end features

Freelance Full Stack Engineers have a broader skill set covering both front-end and back-end development, enabling them to manage entire projects. Freelance Front End Developers specialize in creating engaging user interfaces. The choice depends on project scope and required expertise.

What does a freelance full stack engineer do?

A Freelance Full Stack Engineer is a self-employed software developer who is skilled in both front-end (client-side) and back-end (server-side) technologies. They design, build, and maintain complete web applications or websites, handling everything from user interfaces to databases and server logic. Freelance full stack engineers often work with a variety of clients on short-term or long-term projects, adapting to different tech stacks and business requirements. Their versatility makes them valuable for startups, agencies, and companies needing flexible development expertise.
What are the most commonly searched types of Full Stack Engineer jobs in California? The most popular types of Full Stack Engineer jobs in California are:
What are popular job titles related to Freelance Full Stack Engineer jobs in California? For Freelance Full Stack Engineer jobs in California, the most frequently searched job titles are:
What job categories do people searching Freelance Full Stack Engineer jobs in California look for? The top searched job categories for Freelance Full Stack Engineer jobs in California are:
What cities in California are hiring for Freelance Full Stack Engineer jobs? Cities in California with the most Freelance Full Stack Engineer job openings:
Freelance Full Stack Engineer jobs near you
Infographic showing various Freelance Full Stack Engineer job openings in California as of August 2026, with employment types broken down into 73% Full Time, and 27% Contract. Highlights an 100% In-person job distribution.

Full Stack Engineer

Wonderschool

San Francisco, CA • On-site

$180K - $220K/yr

Full-time

Medical, PTO

Re-posted 5 days ago

Job description

About Wonderschool
Wonderschool's mission is to ensure every child has access to early childhood education that helps them realize their full potential. We empower small business owners, childcare providers, to launch and grow programs through software, coaching, and support, while partnering with governments to modernize childcare infrastructure.
We are building a category-defining platform at the intersection of marketplace, SaaS, and public sector systems, now increasingly powered by AI. Our products help providers run and grow their businesses, from enrollment and marketing to licensing, compliance, and daily operations.
Our team is small, fast-moving, and deeply focused on building systems that scale. We value people who take ownership, experiment quickly, and use modern tools, including AI and automation, to increase their leverage and impact.
Position Summary
This role builds the core systems that power Wonderschool's platform, enabling providers to launch and grow their businesses, governments to operate programs at scale, and families to access care. As a Senior Full Stack Engineer, you will own features end-to-end, working across frontend, backend, and data layers to deliver high-quality, scalable products.
You will operate as a builder, partnering closely with product, design, and go-to-market teams to turn real-world problems into simple, effective solutions. Success in this role means shipping quickly, improving system reliability, and leveraging modern tools, including AI, to increase development velocity and product impact.
Responsibilities
Build and Own Product End-to-End
  • Design, build, and ship full-stack features that improve provider, parent, and government experiences
  • Own the full development lifecycle, from scoping and architecture to implementation and production support
  • Write high-quality, maintainable code with strong test coverage
  • Debug and resolve production issues across the stack
Drive Product Impact
  • Partner closely with Product, Design, and Data to build features that solve real customer problems
  • Develop a deep understanding of customer workflows and use cases
  • Contribute to product decisions through technical insight and tradeoff analysis
  • Work closely with GTM teams to understand user needs and improve product outcomes
Improve Systems and Scale
  • Design systems and data models that support complex workflows and integrations
  • Improve performance, scalability, and reliability of the platform
  • Contribute to architecture decisions and technical direction
  • Help evolve engineering standards, tooling, and best practices
Increase Engineering Leverage
  • Use AI tools, automation, and modern development workflows to increase speed and efficiency
  • Identify opportunities to reduce manual work and improve developer productivity
  • Contribute to a culture of rapid iteration and continuous improvement
Required Qualifications
  • 6+ years of experience as a full stack engineer
  • Strong experience with modern frontend technologies (React, TypeScript, JavaScript)
  • Proficiency with backend systems (Node.js, Ruby on Rails, Elixir, or similar)
  • Experience working with relational databases (Postgres or similar)
  • Proven ability to deliver high-quality code with strong testing practices
  • Experience building and shipping production systems end-to-end
  • Strong collaboration and communication skills
Preferred Qualifications
  • Experience building complex or enterprise-grade systems with multiple integrations
  • Experience designing APIs (REST or GraphQL)
  • Familiarity with cloud infrastructure, containerization, or serverless architectures
  • Experience with CI/CD pipelines and DevOps practices
  • Experience working in fast-paced, high-growth environments
  • Experience incorporating AI into products or development workflows
Compensation & Benefits
Compensation Range (California):
The base salary range for this role is $180,000 - $220,000, depending on experience, skills, and location. This role may also be eligible for equity and other forms of compensation.
Wonderschool offers a competitive benefits package, including:
  • Health benefits with up to 100% coverage for employee premiums and up to 80% for dependents
  • Wifi and employee wellness stipends
  • Flexible PTO, paid holidays, and mental wellness days
  • Competitive parental leave (eligible after 6 months of employment)
  • A highly collaborative, mission-driven workplace environment
Location / Travel Expectations
This role is based in our office in Rincon Hill, San Francisco. We work in-office 5-6 days a week to enable close collaboration across engineering, product, and leadership teams.

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