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Frontend Developer Engineer Jobs in Boulder, CO (NOW HIRING)

Horizontal Talent

Senior Optimizely CMS Developer

Golden, CO · Remote

$118K - $155K/yr

This Senior Optimizely Developer role is a great fit for someone who enjoys building scalable CMS ... Partner on server-side testing and feature flagging when frontend testing is not the best fit.

CACI

Front End Software Developer

Denver, CO

$107K - $124K/yr

Job Title: Front End Software Developer Job Category: Engineering Time Type: Full time Minimum Clearance Required to Start: TS/SCI Employee Type: Regular Percentage of Travel Required: None Type of ...

Horizontal Talent

Senior CMS Developer Optimizely

Denver, CO · Remote

$118K - $155K/yr

This Senior Optimizely Developer role is a great fit for someone who enjoys building scalable CMS ... Partner on server-side testing and feature flagging when frontend testing is not the best fit.

CACI

Front End Software Developer

Denver, CO

$107K - $124K/yr

Job Title: Front End Software Developer Job Category: Engineering Time Type: Full time Minimum Clearance Required to Start: TS/SCI Employee Type: Regular Percentage of Travel Required: None Type of ...

Horizontal Talent

Senior CMS Developer Optimizely

Arvada, CO · Remote

$116K - $153K/yr

This Senior Optimizely Developer role is a great fit for someone who enjoys building scalable CMS ... Partner on server-side testing and feature flagging when frontend testing is not the best fit.

Horizontal Talent

Senior Optimizely CMS Developer

Welby, CO · Remote

$118K - $155K/yr

This Senior Optimizely Developer role is a great fit for someone who enjoys building scalable CMS ... Partner on server-side testing and feature flagging when frontend testing is not the best fit.

Horizontal Talent

Senior Optimizely CMS Developer

Denver, CO · Remote

$116K - $152K/yr

This Senior Optimizely Developer role is a great fit for someone who enjoys building scalable CMS ... Partner on server-side testing and feature flagging when frontend testing is not the best fit.

Horizontal Talent

Senior CMS Developer Optimizely

Denver, CO · Remote

$116K - $152K/yr

This Senior Optimizely Developer role is a great fit for someone who enjoys building scalable CMS ... Partner on server-side testing and feature flagging when frontend testing is not the best fit.

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Showing results 41-60

All JobsFrontend Developer Engineer JobsFrontend Developer Engineer Jobs in Boulder, CO

Frontend Developer Engineer information

See Boulder, CO salary details

$63.3K

$144.1K

$205.3K

How much do frontend developer engineer jobs pay per year?

As of Sep 11, 2026, the average yearly pay for frontend developer engineer in Boulder, CO is $144,087.00, according to ZipRecruiter salary data. Most workers in this role earn between $117,200.00 and $167,500.00 per year, depending on experience, location, and employer.

What is a frontend developer engineer?

Frontend Developer Engineers are professionals who design, build, and maintain the user interface and user experience of websites or web applications. They use technologies like HTML, CSS, and JavaScript to create responsive and interactive designs that work across different devices and browsers. Their role often involves collaborating with designers and backend developers to ensure seamless integration of visual elements and server-side logic. Frontend Developer Engineers also optimize web performance and accessibility to provide the best possible experience for users.

How do frontend developer engineers typically collaborate with designers and backend developers during a project?

Frontend Developer Engineers work closely with UX/UI designers to translate design mockups into interactive web interfaces, ensuring fidelity to the intended user experience. They also coordinate regularly with backend developers to integrate APIs and ensure seamless data flow between the client side and server side. Effective communication, participation in agile ceremonies, and using collaboration tools like Git, Jira, or Figma are essential for aligning on project requirements, managing dependencies, and resolving issues quickly.

What are the key skills and qualifications needed to thrive as a frontend developer engineer, and why are they important?

To thrive as a Frontend Developer Engineer, you need proficiency in HTML, CSS, JavaScript, and a solid understanding of responsive design, typically supported by a degree in computer science or a related field. Experience with frameworks like React, Angular, or Vue.js, as well as familiarity with version control systems such as Git, are commonly required technical skills. Strong problem-solving abilities, attention to detail, and effective communication help you collaborate with designers and back-end engineers. These skills are essential to create user-friendly, high-performance web applications that meet both technical and business requirements.

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

AspectFrontend Developer EngineerFrontend Developer
Required CredentialsBachelor's in CS or related field, proficiency in HTML, CSS, JavaScriptBachelor's in CS or related field, proficiency in HTML, CSS, JavaScript
Work EnvironmentCollaborates with cross-functional teams, involved in technical implementationFocuses on UI/UX, coding, and visual aspects of websites
Employer & Industry UsageTech companies, startups, agenciesWeb development firms, tech companies, freelance projects
Common Search & ComparisonYesYes

The main difference between a Frontend Developer Engineer and a Frontend Developer lies in the scope of responsibilities. The Engineer role often emphasizes technical implementation, collaboration with backend teams, and sometimes includes more complex problem-solving. Both roles require similar credentials and are used across similar industries, but the Engineer title may suggest a more technical or integrated position within development teams.

What cities near Boulder, CO are hiring for Frontend Developer Engineer jobs?

Cities near Boulder, CO with the most Frontend Developer Engineer job openings:

Frontend Developer Engineer jobs near you

Senior Optimizely CMS Developer

Golden, CO • Remote

Horizontal Talent
Recruiting and Staffing Services • 201 - 500 employees
Learn more about Horizontal Talentexternal

$118K - $155K/yr

Full-time

This job post has expired 3 days ago. Applications are no longer accepted.

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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