Top 1399 Senior Ui Developer Jobs

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Senior React Developer

Confidential
Ontario, CA

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Job Details

Full-time
$85,000 - $130,000 a year
4 days ago

Qualifications

Authentication
Responsive design
Secure web application development
Software engineering
Authorization controls implementation
CSS
Tooling
Enterprise software
Application Architecture Design (Architecture design skill)
Front-end state management
System performance optimization
UI design systems
Git
Data caching
Quality assurance in testing
Developing automated testing protocols
Integration with Third-Party Services (system development)
Front-end component implementation
Back-end integration
TypeScript
Cross-browser compatibility design
HTML
Providing code feedback

Full Job Description

Senior React Developer

Employment Type: Full-Time

Work Arrangement: Remote

Compensation: $85,000 — $130,000 CAD / annum

Overview

A software development firm is seeking a Senior React Developer to own the front-end of scalable web platforms built for its clients. This role suits a senior engineer who cares as much about how an interface behaves for the people using it as about how it is built underneath.

You will define front-end architecture, set the standards the team builds against, and take features from planning through release and ongoing improvement — working alongside product managers, designers, backend engineers, and QA within a collaborative delivery environment.

Responsibilities

Design, architect, and build large-scale React applications using functional components, hooks, reusable component patterns, and appropriate state-management solutions.
Define and maintain the front-end architecture, coding standards, and technical practices the team works against.
Build responsive, accessible interfaces from product and design requirements, and translate wireframes, prototypes, and design systems into accurate, polished UI.
Optimize applications for performance, scalability, security, and maintainability.
Integrate front-ends with REST APIs, third-party services, and backend systems.
Write clean, documented, reusable code, and maintain unit, integration, component, and end-to-end tests.
Conduct code reviews and give other engineers direct, constructive technical feedback.
Diagnose and resolve complex front-end issues across browsers, devices, and environments.
Contribute to technical planning, solution design, estimation, and architectural decisions.
Mentor intermediate and junior developers, and advocate for accessibility, usability, and consistency throughout delivery.

Requirements

5+ years of professional front-end development, with significant experience building React applications.
Proven experience designing and architecting complex, large-scale React applications.
Advanced React: hooks, component composition, rendering behavior, context, and reusable design patterns.
Strong proficiency in modern JavaScript, TypeScript, HTML5, and CSS3.
Experience with a front-end state-management solution — Redux Toolkit, Zustand, React Query, or similar.
Working command of performance techniques: memoization, lazy loading, code splitting, caching, bundle and render optimization.
Experience integrating front-ends with REST APIs and asynchronous services.
Solid grasp of HTTP, browser rendering, authentication, authorization, and client-side security.
Experience with modern build tooling: Vite, Webpack, Babel, npm, or Yarn.
Testing experience with Jest, Vitest, React Testing Library, Cypress, or Playwright.
Strong Git-based workflows: pull requests, branching strategies, and code reviews.
Strong understanding of responsive design and cross-browser compatibility.
Clear communicator who can work independently, manage competing priorities, and contribute within a distributed team.

Preferred Experience

Next.js and its rendering models — SSR, SSG, server components, and route-based data loading.
Building or maintaining shared component libraries and design systems.
Accessibility standards and practices, including WCAG and semantic HTML.
Cloud-hosted applications on AWS, Azure, or Google Cloud.
CI/CD pipelines, automated testing, and deployment workflows.
API caching and data synchronization with TanStack Query.
Front-end observability, error tracking, analytics, and performance monitoring.
Agile or Scrum product development.
Enterprise SaaS work involving complex workflows, dashboards, data visualization, or role-based access.
Integration of large language model services (an asset).

What Success Looks Like

Ships scalable, maintainable, production-ready front-end work.
Makes sound architectural calls that balance technical quality, delivery timelines, and business priorities.
Surfaces performance, usability, and maintainability improvements before they become problems.
Produces interfaces that are reliable, accessible, responsive, and intuitive.
Lifts the engineers around them through mentorship and thoughtful reviews.
Explains technical decisions clearly to technical and non-technical stakeholders alike.

Engagement Details

Role type: Full-time.
Work environment: Remote, with hybrid as project needs require.

About the Company

An established technology and product development organization with deep experience helping clients design, build, and scale digital products. Its multidisciplinary teams span software engineering, AI automation, cloud infrastructure, product strategy, quality assurance, and user experience. Full company details are shared with shortlisted candidates during the interview process.

Use of AI and Recording in Our Hiring Process

As part of our commitment to a fair, consistent, and unbiased hiring process, we may use artificial-intelligence (AI) tools at points during screening and interviews to support tasks such as assessments, note-taking, and summarizing conversations. Some interview sessions may also be recorded.

Equal Opportunity

We are an equal opportunity employer. We evaluate all qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other characteristic protected by applicable law. Accommodations are available on request throughout the recruitment process.

Pay: $85,000.00 - $130,000.00 per year

Work Location: Remote

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