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Senior React Frontend Developer Jobs in Colorado

Horizontal Talent

Senior Optimizely CMS Developer

Welby, CO · Remote

$118K - $155K/yr

Partner on server-side testing and feature flagging when frontend testing is not the best fit ... jQuery, React, or Vue. * Deep understanding of Optimizely platform concepts such as Project JS ...

Horizontal Talent

Senior Optimizely CMS Developer

Denver, CO · Remote

$118K - $155K/yr

Partner on server-side testing and feature flagging when frontend testing is not the best fit ... jQuery, React, or Vue. * Deep understanding of Optimizely platform concepts such as Project JS ...

Horizontal Talent

Senior Optimizely CMS Developer

Denver, CO · Remote

$116K - $152K/yr

Partner on server-side testing and feature flagging when frontend testing is not the best fit ... jQuery, React, or Vue. * Deep understanding of Optimizely platform concepts such as Project JS ...

Horizontal Talent

Senior CMS Developer Optimizely

Denver, CO · Remote

$116K - $152K/yr

Partner on server-side testing and feature flagging when frontend testing is not the best fit ... jQuery, React, or Vue. * Deep understanding of Optimizely platform concepts such as Project JS ...

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Senior React Frontend Developer information

What does a senior React frontend developer do?

A Senior React Frontend Developer is responsible for designing, developing, and maintaining user interfaces using the React JavaScript library. They work closely with designers, backend developers, and product managers to deliver seamless and efficient web applications. In addition to coding, they often mentor junior developers, ensure code quality, and implement best practices for performance and accessibility. Their expertise helps create scalable, maintainable, and visually appealing user experiences.

What are the key skills and qualifications needed to thrive as a senior React frontend developer?

To thrive as a Senior React Frontend Developer, you need advanced proficiency in JavaScript, React.js, HTML, and CSS, typically backed by a degree in computer science or related experience. Familiarity with tools like Redux, TypeScript, RESTful APIs, version control systems (e.g., Git), and modern build tools (Webpack, Babel) is essential. Strong problem-solving skills, effective communication, and the ability to mentor junior developers are standout soft skills in this role. These skills and qualities ensure the delivery of scalable, maintainable web applications and foster productive collaboration within development teams.

What are some common challenges faced by senior React frontend developers when working on large-scale applications?

Senior React Frontend Developers often encounter challenges such as managing complex state across large applications, ensuring optimal performance, and maintaining code consistency with multiple contributors. They are also responsible for integrating new features without disrupting existing functionality and keeping up with evolving best practices in the React ecosystem. Effective collaboration with backend teams and UX designers is essential to deliver seamless user experiences and scalable solutions.

What is the difference between Senior React Frontend Developer vs Frontend Developer?

AspectSenior React Frontend DeveloperFrontend Developer
Required SkillsAdvanced React, JavaScript, TypeScript, leadershipBasic to intermediate React, HTML, CSS
Experience5+ years, project leadership1-3 years, entry to mid-level
Work EnvironmentCollaborates on complex projects, mentors juniorsDevelops UI components, supports team
CertificationsRelevant certifications (e.g., React certifications)Optional, beginner certifications

The main difference between a Senior React Frontend Developer and a Frontend Developer lies in experience, skill level, and responsibilities. Senior developers handle complex projects, mentor team members, and possess advanced React expertise, while frontend developers focus on building UI components with less experience and responsibility.

What are the most commonly searched types of React Frontend Developer jobs in Colorado?

The most popular types of React Frontend Developer jobs in Colorado are:

What are popular job titles related to Senior React Frontend Developer jobs in Colorado?

For Senior React Frontend Developer jobs in Colorado, the most frequently searched job titles are:

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The top searched job categories for Senior React Frontend Developer jobs in Colorado are:

What cities in Colorado are hiring for Senior React Frontend Developer jobs?

Cities in Colorado with the most Senior React Frontend Developer job openings:

Senior React Frontend Developer jobs near you

Senior Optimizely CMS Developer

Horizontal Talent

Welby, CO • Remote

$118K - $155K/yr

Full-time

Posted 25 days ago

Job description

Join a fast-moving digital marketing team that is investing heavily in modern web technology, experimentation, and data-driven growth. This Senior Optimizely Developer role is a great fit for someone who enjoys building scalable CMS solutions, launching sophisticated experiments, and using AI-assisted tools to work faster and smarter.

Responsibilities
  • Build and maintain reusable components, page templates, and content models within Optimizely CMS to help marketing teams launch web pages efficiently.
  • Design CMS architecture that supports scalability, security, and strong performance, including Core Web Vitals optimization.
  • Develop and support integrations between Optimizely CMS and enterprise platforms such as Salesforce, Marketo, Adobe Commerce, and internal systems.
  • Create and deploy advanced A/B, split, and multivariate tests in Optimizely Web Experimentation, including custom DOM manipulation and dynamic content changes.
  • Implement personalized web experiences for targeted B2B audiences and account-based marketing campaigns.
  • Partner on server-side testing and feature flagging when frontend testing is not the best fit.
  • Perform thorough cross-browser and cross-device testing to help ensure smooth, consistent user experiences with minimal flicker or layout shift.
  • Define and document best practices, technical standards, and governance guidelines for Optimizely-related work.
  • Collaborate closely with CRO, product, and design teams to evaluate ideas, prototype solutions, and translate designs into polished digital experiences.
  • Use AI-assisted development tools to accelerate coding, debugging, testing, and experimentation workflows.
Skills
  • 5+ years of full-stack web development experience.
  • At least 3+ years of hands-on experience working within the Optimizely ecosystem.
  • Strong backend development skills with C# and .NET Core/MVC, especially in Optimizely CMS environments.
  • Advanced frontend experience with HTML5, CSS3/SASS, and JavaScript, including Vanilla JS, ES6+, jQuery, React, or Vue.
  • Deep understanding of Optimizely platform concepts such as Project JS, visual tags, audience targeting, anti-flicker approaches, and caching behavior.
  • Experience building for complex B2B websites, including lead generation and gated content workflows.
  • Strong Git knowledge and familiarity with modern CI/CD workflows such as Azure DevOps or GitHub Actions.
  • Ability to work independently while also partnering effectively with cross-functional teams.
  • A proactive, solution-oriented mindset with a focus on speed, quality, and continuous improvement.
Preferred Skills
  • Active Optimizely Developer certification in CMS or Web Experimentation.
  • Experience supporting server-side experimentation and feature flagging initiatives.
  • Familiarity with UX/UI collaboration and translating wireframes or Figma designs into interactive experiences.
  • Comfort using AI tools such as GitHub Copilot or ChatGPT to support development efficiency.
  • Experience working in remote-first environments and collaborating across multiple locations.

Horizontal is committed to fostering an inclusive environment where all qualified candidates can thrive. We value diversity, equity, and inclusion as essential to building strong teams, better ideas, and better outcomes.

By applying for this position, you acknowledge and agree that Horizontal Talent may contact you regarding your application using automated technology, including phone calls, SMS/text messages, or email, which may be delivered by our virtual AI recruiter, Alex.

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