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Junior React Developer Startup Jobs in California

Fuku

Senior Software Engineer

San Francisco, CA · On-site

$144K - $190K/yr

... developer experience, and performance - Mentor junior engineers and help shape engineering best ... startup or top AI company (e.g., Stripe, Ramp, OpenAI, Anthropic) - Strong backend or full-stack ...

Fuku

Senior Software Engineer

San Francisco, CA · On-site

$144K - $190K/yr

I mprove internal tooling, developer experience, and performance * M entor junior engineers and ... S trong backend or full-stack depth across React, Node.js, Postgres (or equivalent) * P roven ...

VSolvit

JUNIOR FULL STACK DEVELOPER

Norco, CA · On-site

They are seeking a motivated and detail-oriented Junior Full Stack Developer to join their team ... Responsibilities : • Build responsive, user-friendly UI components using HTML5, CSS3, React, and ...

FreedomPay

Jr. Front-End Engineer

San Francisco, CA · On-site

FreedomPay is a product-driven startup transforming the way companies grow their teams. They are seeking a Junior Front-End Engineer to build pioneering local commerce applications and collaborate ...

Prosum Inc.

Junior Full Stack Engineer

Santa Monica, CA · On-site

$70K - $95K/yr

Junior Full Stack Engineer Salary Range: $70,000-$95,000 About the Role We are seeking a Junior ... Build user interface components using React.js and TypeScript , following established design ...

Fuser

Jr. Full Stack Engineer

Los Angeles, CA · On-site

$70 - $90/hr

You'll join early as our Junior Full Stack Engineer, working alongside our team to help ship ... Implement UI components and user interactions in React + TypeScript * Support backend endpoints ...

FLIGHTSTORY

Junior Software Engineer

Los Angeles, CA

$95K/yr

TypeScript, React, Node.js, Python, JavaScript * Familiar with databases (SQL and NoSQL) and API ... Open source contributions or active participation in developer communities * Exposure to early ...

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Junior React Developer Startup information

What does a junior React developer do at a startup?

A Junior React Developer at a startup is responsible for building and maintaining user interfaces using the React JavaScript library. They typically work closely with designers and other developers to implement features, fix bugs, and ensure the application's front-end is responsive and user-friendly. In a startup environment, they may also have opportunities to contribute ideas, learn new technologies, and take on additional responsibilities as the company grows.

What are some common challenges faced by junior React developers in a startup environment?

Junior React Developers in startups often encounter fast-paced work environments where priorities can shift quickly, requiring adaptability and a willingness to learn on the job. Collaboration is key, as you’ll likely work closely with designers, backend developers, and product managers to rapidly build and iterate on features. Limited resources and smaller teams mean you may take on a broader range of tasks than in larger companies, which can accelerate your learning but also present challenges in managing workloads. It's important to communicate proactively, seek feedback, and take initiative to overcome obstacles and grow your skills.

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

To thrive as a Junior React Developer at a startup, you need a solid understanding of JavaScript, React.js fundamentals, and basic web development concepts, typically supported by a relevant degree or coding bootcamp experience. Familiarity with version control systems like Git, package managers (npm/yarn), and basic knowledge of RESTful APIs are usually expected. Proactive communication, eagerness to learn, and adaptability help you stand out in the fast-paced and collaborative startup environment. These skills are crucial for contributing effectively to dynamic projects, rapidly acquiring new technologies, and supporting the team’s growth.

What is the difference between Junior React Developer Startup vs Junior Front-End Developer?

AspectJunior React Developer StartupJunior Front-End Developer
Required SkillsReact.js, JavaScript, HTML, CSSHTML, CSS, JavaScript, basic frameworks
Work EnvironmentStartups, agile teams, fast-pacedVarious industries, corporate or agency settings
CertificationsBasic web development certifications, React coursesWeb development certifications, HTML/CSS courses
Industry UsageTech startups, SaaS companiesMedia, marketing, corporate firms

Junior React Developer Startup focuses specifically on React.js skills within startup environments, emphasizing JavaScript and modern frameworks. In contrast, Junior Front-End Developer is a broader role covering general front-end skills across various industries. Both roles require foundational web development knowledge, but the React Developer position is more specialized and often found in tech-driven startups.

What are popular job titles related to Junior React Developer Startup jobs in California?

For Junior React Developer Startup jobs in California, the most frequently searched job titles are:

What job categories do people searching Junior React Developer Startup jobs in California look for?

The top searched job categories for Junior React Developer Startup jobs in California are:

What cities in California are hiring for Junior React Developer Startup jobs?

Cities in California with the most Junior React Developer Startup job openings:

Junior React Developer Startup jobs near you

Full Stack Software Engineer

Stealth Startup

Redwood City, CA • On-site

$180 - $240/hr

Other

Posted 3 days ago

New

Job description

About Us

We're building the intelligence layer for the home: ambient, proactive, and built into a family of devices—a central hub, accessories, and the software that ties them together. We're a Series A startup backed by a tier-1 VC and technology partners, with an ex-unicorn founder. Early team, moving fast.

The Role

We're looking for a senior full stack engineer to help build the software foundation for a new category of consumer technology.

You'll work across the stack from customer-facing experiences to backend systems, AI integrations, and the infrastructure that powers them. This is a role for someone who loves building products from scratch, thrives in ambiguity, and wants to have a direct impact on what gets shipped every week.

As an early member of the team, you'll have significant ownership over technical decisions, architecture, product development, and engineering culture. You'll work closely with founders, design, product, and hardware teams to turn ambitious ideas into products people use every day.

What You'll Do
  • Design, build, and ship customer-facing products across web, mobile, and device experiences.
  • Develop scalable backend services, APIs, and infrastructure that power our platform.
  • Work across the entire product lifecycle, from early prototypes to production systems.
  • Partner closely with product, design, AI, and hardware teams to bring new experiences to life.
  • Build integrations between software, AI systems, and connected devices.
  • Improve reliability, performance, security, and developer experience across the stack.
  • Make thoughtful technical decisions while balancing speed, quality, and long-term maintainability.
  • Help define engineering culture, standards, and best practices as the team grows.
  • Own projects end-to-end and ship quickly with a high degree of autonomy.
You
  • 4+ years of experience building and shipping production software.
  • Strong full stack engineering skills with experience across frontend and backend development.
  • Comfortable working across multiple parts of the stack and learning new technologies when needed.
  • Experience building products from 0 to 1 or working in fast-paced startup environments.
  • Strong product instincts and a desire to build things people actually use.
  • Able to move quickly without sacrificing quality.
  • Excellent problem-solving skills and attention to detail.High ownership, low ego, and strong collaboration skills.
Nice to Have
  • Experience building consumer products at scale.
  • Experience with AI-powered products, LLMs, agents, or conversational interfaces.
  • Experience with real-time systems, IoT, connected devices, or smart home products.
  • Experience with React, TypeScript, Python, mobile development, or cloud infrastructure.
  • Prior startup or founding engineer experience.
  • Strong interest in product design and user experience.
Why Join
  • Help define an entirely new category of consumer technology.
  • Work directly with experienced founders and an exceptional early team.
  • Own meaningful parts of the product from day one.
  • Build products that blend hardware, software, AI, and design.
  • Join early enough to shape both the technology and the company.
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