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Sr. Full-Stack Engineer (Frontend Heavy)

PASONA N A, INC. -
Irvine, CA

Apply Now

Job Details

Full-time
$110,000 - $120,000 a year

Qualifications

Responsive design
Performance tuning
Software engineering
CSS
SQL databases
System performance optimization
English
Scalable systems
Production systems
Data caching
Accessible front-end development
Scalability
Developing and maintaining backend systems
Agile software development
UI implementation
Front-end component implementation
TypeScript
Cross-functional communication

Full Job Description

Senior Full-Stack Engineer (Frontend-Heavy)

Location: Irvine, CA 92618

Work Style: Hybrid (3 days/week in office)

Work Hours: 9:00 AM – 6:00 PM

Salary Range: $110,000 – $120,000 base

Experience Level: 5–10 years

Work Authorization Requirement: Due to company policy, we are unable to provide visa sponsorship now or in the future.

Candidates must be legally authorized to work in the United States on a permanent basis. Applicants requiring visa sponsorship cannot be considered.

About the Company

A growing software company based in Irvine, California is seeking a Senior Full-Stack Engineer to help expand and evolve a modern B2B customer support and ticketing platform primarily serving Japanese business customers.

This is a unique opportunity to join a small, collaborative product team where your work directly impacts customers and product direction. The team works closely with global counterparts and values ownership, technical excellence, and thoughtful product development.

The Role

We are looking for a Senior Full-Stack Engineer with strong frontend expertise to help build and scale a modern SaaS platform. This is a full-stack role with a strong emphasis on React + TypeScript frontend development, while also contributing to backend APIs and platform architecture as needed.

You will collaborate closely with engineering, product, and leadership teams to deliver scalable, high-quality user experiences and technical solutions.

What You’ll Do

Modernize and scale a React + TypeScript application while improving architecture and code quality
Build and expand a reusable UI component library using MUI
Design and improve frontend state management and data-fetching architecture
Drive frontend performance improvements including code splitting, lazy loading, caching, and optimization
Develop responsive and polished user experiences across devices and screen sizes
Deliver full-stack features from backend APIs through frontend implementation
Improve and maintain backend services including REST APIs, GraphQL APIs, background workers, and scheduled jobs
Establish engineering best practices, code review standards, and scalable development patterns
Collaborate closely with cross-functional and international teams

Technology Stack

Frontend

React, TypeScript, MUI, TipTap (rich-text editing)

Backend

Node.js, Bun, REST API, GraphQL

Infrastructure & Data

PostgreSQL, Redis, RabbitMQ, Meilisearch, Qdrant, Docker, Kubernetes

Additional

AI-powered platform features

Required Qualifications

7+ years of software engineering experience
Strong recent experience with React and TypeScript- You have led and taken ownership of complex React applications, not just contributed as part of a larger team.
Deep understanding of modern React concepts including:
- Hooks, Suspense, Code splitting, Lazy loading, Performance optimization
Strong experience with frontend state management and caching strategies
Experience modernizing and scaling production applications
Solid understanding of responsive UI development and modern CSS
Experience building accessible and polished user interfaces
Full-stack development experience including backend development with Node.js or similar technologies
Experience working with relational databases such as PostgreSQL
Strong communication and collaboration skills
Ability to work independently within a small agile team
Business-level English communication skills

Preferred Qualifications

Experience with GraphQL (Apollo, urql, etc.) or tRPC
Experience with Bun, Hono, or modern JavaScript runtimes/frameworks
Familiarity with RabbitMQ, Meilisearch, or vector databases
Experience with Docker and Kubernetes
Experience building or maintaining design systems/component libraries
Familiarity with TipTap or ProseMirror
React Native or mobile development experience
Experience working on SaaS, B2B, or ticketing/support platforms
Japanese language skills are a plus

Work Environment

Hybrid schedule: 3 days/week onsite in Irvine, CA
Collaborative and highly technical small-team environment
Opportunity for meaningful ownership and direct product impact
Long-term growth opportunity within an expanding product organization

Apply Now

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