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Sr Frontend Engineer Jobs in California (NOW HIRING)

Senior Frontend Engineer

San Francisco, CA · On-site

$144K - $198K/yr

They are seeking a Senior Frontend Engineer with expertise in React and TypeScript to build consumer-facing crypto and payments products, enhancing user experiences in blockchain transactions.

Senior Front-End Engineer

San Francisco, CA · On-site

$144K - $198K/yr

As a Senior Front-End Engineer, you will develop reusable UI components, enhance user experience, and contribute to the design of the Navigator platform while collaborating with cross-functional ...

We are seeking an experienced and skilled Senior Frontend Developer to join our dynamic team. As a Frontend Developer, you will play a crucial role in the design, development, and implementation of ...

New

Senior Frontend Engineer

San Francisco, CA · On-site

$144K - $198K/yr

The Role: We're looking for a Senior Frontend Engineer to help shape the future of our flagship credit building product - the engine behind our mission to help millions of Americans build and ...

Senior Front-End Engineer

El Segundo, CA · On-site

$130K - $179K/yr

As a Senior Front-End Engineer, you will develop reusable UI components and ensure a high-quality user experience while collaborating with cross-functional teams on the Navigator platform.

... Senior Frontend Engineer on our Frontend Engineering Team, you'll architect and build the core payment experiences that power thousands of businesses. You'll develop our comprehensive payments ...

Senior Front-End Engineer

Palo Alto, CA · On-site

$144K - $198K/yr

They are seeking a Senior Front-End Engineer to develop self-contained, reusable components and enhance their Navigator platform, ensuring a high-quality user experience while collaborating with ...

Senior Front-End Engineer

El Segundo, CA · On-site

$130K - $179K/yr

They are seeking a Senior Front-End Engineer to craft reusable UI components and improve user experience while collaborating with cross-functional teams. Responsibilities : • Contribute to our ...

... Senior Frontend Engineer on our Frontend Engineering Team, you'll architect and build the core payment experiences that power thousands of businesses. You'll develop our comprehensive payments ...

Senior Front End Engineer

Ventura, CA · On-site +1

$174K - $249K/yr

Senior Front-End Engineer Location: 42 N. Chestnut St., Ventura, CA 93001 *Telecommuting permitted: work may be performed within normal commuting distance from The Trade Desk, Inc. office in Ventura ...

Senior Frontend Engineer

San Francisco, CA · On-site

$144K - $198K/yr

About the Role We're looking for a seasoned engineer and frontend technical lead - someone who can ... We're a small, senior team building Siteline - a billing platform for the construction industry.

As a Senior Frontend Engineer, you will be instrumental in building intuitive, high‑performance, and dependable web applications that empower our users to proactively detect and prevent risk. You ...

Senior Front-End Engineer

San Francisco, CA · On-site

$144K - $198K/yr

We are looking for a Senior Frontend Engineer to own the interfaces that our patients and medical providers rely on every single day. Mochi has already helped patients lose over 5 million pounds ...

San Francisco, CA About the role A San Francisco-based startup is looking for a Sr. frontend engineer to build and improve its digital platform. You'll create interactive user interfaces, set ...

As a Senior Frontend Engineer, you will be instrumental in building intuitive, high-performance, and dependable web applications that empower our users to proactively detect and prevent risk. You ...

Senior Frontend Engineer

San Mateo, CA · On-site

$178K - $223K/yr

Senior Frontend Engineer Primary: Bay Area (San Francisco / Peninsula) | Secondary: NYC The Opportunity We're doing an AI-first engineering rebuild for a company that already has an audience of 100M ...

Senior Front-End Engineer

San Francisco, CA · On-site

$144K - $198K/yr

We are looking for a Senior Frontend Engineer to own the interfaces that our patients and medical providers rely on every single day. Mochi has already helped patients lose over 5 million pounds ...

Senior Front End Engineer

San Francisco, CA · On-site

$144K - $198K/yr

The Opportunity We're hiring Senior Front End Engineers at Gametime to help build and scale the systems, applications, and experiences that power Gametime for millions of users. You'll own a ...

Showing results 21-40

Sr Frontend Engineer information

What is a Sr Frontend engineer?

Sr Frontend Engineers are experienced software developers who specialize in building and optimizing the user-facing parts of web applications. They lead the design and implementation of complex interfaces, ensure performance and accessibility, and often mentor junior engineers. Their role includes working closely with designers, backend developers, and product managers to deliver high-quality, scalable front-end solutions. Typically, they have a deep understanding of modern JavaScript frameworks, web standards, and best practices.

What are the key skills and qualifications needed to thrive as a Sr Frontend engineer?

To thrive as a Sr Frontend Engineer, you need advanced expertise in JavaScript, HTML, CSS, and modern frontend frameworks like React or Angular, typically supported by a degree in computer science or equivalent experience. Familiarity with version control systems (like Git), build tools (Webpack, Babel), and testing frameworks (Jest, Cypress) is standard, and certifications in relevant technologies are a plus. Strong problem-solving abilities, attention to detail, and effective communication help you collaborate with cross-functional teams and mentor junior developers. These technical and interpersonal skills are crucial for delivering robust, maintainable user interfaces that drive business outcomes.

How does a Sr Frontend engineer typically collaborate with backend teams to deliver high-quality user experiences?

As a Sr Frontend Engineer, you’ll frequently work closely with backend developers to define APIs, discuss data requirements, and troubleshoot integration issues. Regular collaboration involves participating in planning meetings, code reviews, and joint debugging sessions to ensure frontend and backend components align seamlessly. This cross-team communication is essential for delivering responsive, efficient, and scalable user interfaces, and it also provides opportunities to influence architectural decisions and improve overall product quality.

What is the difference between Sr Frontend Engineer vs Frontend Developer?

AspectSr Frontend EngineerFrontend Developer
Required CredentialsBachelor's in CS or related field, 5+ years experience, advanced JavaScript frameworksBachelor's in CS or related field, 2-4 years experience, proficiency in HTML, CSS, JavaScript
Work EnvironmentLead projects, mentor junior staff, collaborate with cross-functional teamsImplement UI features, fix bugs, collaborate with designers and backend developers
Employer & Industry UsageTech companies, startups, large enterprisesWeb development agencies, startups, tech firms

The main difference between a Sr Frontend Engineer and a Frontend Developer lies in experience, responsibilities, and leadership. Sr Frontend Engineers typically have more experience, lead projects, and mentor others, while Frontend Developers focus on implementing features and fixing bugs. Both roles require strong JavaScript skills, but the senior role involves more strategic planning and team collaboration.

What are popular job titles related to Sr Frontend Engineer jobs in California?

For Sr Frontend Engineer jobs in California, the most frequently searched job titles are:

What job categories do people searching Sr Frontend Engineer jobs in California look for?

The top searched job categories for Sr Frontend Engineer jobs in California are:

What cities in California are hiring for Sr Frontend Engineer jobs?

Cities in California with the most Sr Frontend Engineer job openings:

Infographic showing various Sr Frontend Engineer job openings in California as of August 2026, with employment types broken down into 95% Full Time, 2% Part Time, and 3% Contract. Highlights an 85% Physical, 6% Hybrid, and 9% Remote job distribution.

Senior Frontend Engineer

Halliday

San Francisco, CA • On-site

$144K - $198K/yr

Full-time

Re-posted 19 days ago


Job description

Job Summary:
Halliday is a blockchain company and product lab focused on creating a unified payments ecosystem. They are seeking a Senior Frontend Engineer with expertise in React and TypeScript to build consumer-facing crypto and payments products, enhancing user experiences in blockchain transactions.
Responsibilities:
• Build User-Facing Products: Design and develop responsive, performant frontend applications using React and TypeScript that interact with blockchain networks, payment systems, and DeFi protocols while delivering an exceptional user experience.
• Develop Core Infrastructure: Build scalable components, design systems, and testing frameworks that support our payments platform and developer tools.
• Ship Developer Tools: Contribute to Halliday's public SDKs and APIs, making it easy for developers to integrate blockchain payments into their applications.
• Work Cross-Functionally: Collaborate with product, design, engineering, and partnerships teams to deliver features that solve real user problems and drive product adoption.
• Drive Technical Excellence: Identify and implement improvements to enhance performance, accessibility, security, and code quality across our frontend stack.
• Innovate on Web3 UX: Push the boundaries of what's possible in blockchain user experiences, making complex onchain actions feel simple and intuitive.
Qualifications:
Required:
• 2+ years of experience building production frontend applications with React and TypeScript.
• Strong understanding of modern frontend development including state management, API integration, responsive design, and performance optimization.
• You write clean, maintainable code and care deeply about user experience.
• You think beyond just implementing features, you understand the 'why' behind what you're building and advocate for the best user experience.
• You're excited to dive into new technologies, whether that's blockchain SDKs, payment APIs, or emerging web standards.
• You work well with cross-functional teams, communicate effectively, and thrive in a fast-paced startup environment.
• Based in or willing to relocate to the San Francisco Bay Area or New York City.
Preferred:
• Previous work with blockchain technologies such as EVM-based chains, Solana, or Bitcoin.
• Familiarity with Web3 libraries like ethers.js, viem, or wagmi.
• Experience building payment flows, checkout experiences, or financial products.
• Comfort working across the stack when needed, including APIs and backend services.
• Strong eye for design and experience working closely with designers to implement pixel-perfect interfaces.
• Active participation in open source projects or maintenance of public libraries.
Company:
Halliday is a workflow protocol designed to automate workflows and manage reliability across various systems. Founded in 2022, the company is headquartered in San Francisco, USA, with a team of 11-50 employees. The company is currently Early Stage.