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Mid Level Frontend Developer React Js Jobs in California

TestingXperts

Front end Developer

Carlsbad, CA

$107K - $125K/yr

Position: Front End Developer Client: Persistent Systems/ Thermo Fisher Location: Carlsbad, CA ... Looking for mid-level resources preferably 5-7 years of experience or more. Additional Information ...

LMI

Front-End Developer - Clearance Required

San Diego, CA · On-site

$110K - $128K/yr

Overview LMI is looking for an experienced mid-level Front-End Developer to help build and extend a ... in React, JavaScript, HTML5, and CSS3 * Genuine fluency in HCD and UX principles, not just ...

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What is the difference between Mid Level Frontend Developer React Js vs Frontend Developer Vue.js?

AspectMid Level Frontend Developer React JsFrontend Developer Vue.js
Required SkillsProficiency in React.js, JavaScript, HTML, CSS, state managementProficiency in Vue.js, JavaScript, HTML, CSS, component-based architecture
Work EnvironmentWeb development teams using React.js frameworksWeb development teams utilizing Vue.js frameworks
Common Industry UsagePopular in large-scale applications, enterprise solutionsFavored for flexible, lightweight projects, startups

Both roles require strong JavaScript skills and familiarity with modern frontend frameworks. The main difference lies in the specific framework: React.js is widely used in enterprise environments, while Vue.js is known for its simplicity and flexibility. Choosing between them depends on the project requirements and team preferences.

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Senior Front End Engineer (React/Next.js)

The Mortgage Office

Huntington Beach, CA • On-site

$129K - $178K/yr

Full-time

Re-posted 2 days ago

Job description

Job Summary:
Applied Business Software, Inc., the maker of The Mortgage Office®, is the industry leader in private lending and loan management technology. They are seeking a highly skilled front-end-focused Senior Software Engineer to build scalable, responsive user experiences using React and Next.js while collaborating with cross-functional teams.
Responsibilities:
• Architect, develop, and continuously enhance scalable, high-performing web applications built on Next.js and React that handle complex business workflows, with a focus on performance, maintainability, and user experience.
• Work with product and design teams to understand end-user requirements and create solutions that impact our customers, borrowers, and internal users.
• Convert UX/UI concepts into functional prototypes and production-ready code, leveraging reusable component libraries and MUI design systems following industry best practices.
• Lead code and design reviews, and mentor junior engineers, including establishing standards around AI-assisted development workflows to ensure consistent code quality and velocity.
• Drive adoption of agentic development practices using tools like Claude CLI, structured markdown specs, and AI-assisted code generation.
• Collaborate with QA to ensure comprehensive test coverage and assist in diagnosing and resolving issues, including leveraging AI tooling for faster root cause analysis.
• Partner closely with backend engineers to design and integrate reliable APIs, optimize frontend-backend data flows, and ensure seamless end-to-end application performance across the full web stack.
Qualifications:
Required:
• 5+ years of strong frontend engineering experience with deep expertise in React, Next.js, TypeScript, and modern web application architecture.
• Deep expertise in component-based architecture, React hooks, and modern state management, hands-on experience with Zustand, React Query, or similar lightweight state and data-fetching libraries preferred.
• Proficiency with MUI (Material UI) and experience building, scaling, and maintaining reusable, composable design systems and component libraries.
• Strong understanding of end-to-end web application workflows, including frontend-backend integration, API-driven development, authentication flows, performance optimization, and production-grade application delivery.
• Comfort working in an AI-assisted development environment, including prompt-driven workflows, markdown-based specs/documentation, and CLI tools such as Claude CLI or similar AI coding assistants.
• Solid understanding of modern CSS, responsive design, accessibility standards, and front-end performance optimization techniques.
• Strong problem-solving, technical communication, and analytical skills, with the ability to prioritize and execute effectively in a fast-paced, collaborative environment.
Company:
The Mortgage Office® is a powerful suite of lending solutions. Using our comprehensive core loan servicing products. Founded in 1978, the company is headquartered in Long Beach, USA, with a team of 51-200 employees. The company is currently Growth Stage.

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