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Senior Javascript Developer Jobs in Downingtown, PA

TiltEdge Solutions LLC

Senior Tech Lead

Malvern, PA · On-site

$72.50/hr

Job Title: ( Senior Tech Lead)-Java Developer Location: Malvern, PA. Duration: 6-12 Months Rate ... JavaScript/Typescript, CSS, Jest) · Proficiency in Python. · Proficiency in DevOps concepts ...

RIT Solutions, Inc.

Senior Frontend Engineer

Malvern, PA · On-site

$120K - $165K/yr

RIT Solutions, Inc. is seeking a Senior Frontend Engineer with strong UI expertise and hands-on experience in building modern, scalable applications using React.js, Preact, and JavaScript/TypeScript.

AKUVO LLC

Senior Software Engineer

Malvern, PA · On-site

$120K - $158K/yr

... JavaScript, modern React packages, and front and back-end coding. This individual should have ... Experience with GIT and familiarity with the use of Repositories in Azure DevOps * Use of a Caching ...

AKUVO LLC

Senior Software Engineer

Malvern, PA · On-site

$120K - $158K/yr

... JavaScript, modern React packages, and front and back-end coding. This individual should have ... Experience with GIT and familiarity with the use of Repositories in Azure DevOps * Use of a Caching ...

DrayNow, Inc.

Senior Software Engineer

Conshohocken, PA · On-site

$130 - $190/hr

As a Senior Software Engineer, you will play a crucial role in designing, developing, and leading ... Experience with JavaScript and JavaScript Frameworks (React, Node, Express, React Native, etc). All ...

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Senior Javascript Developer information

See Downingtown, PA salary details

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How much do senior javascript developer jobs pay per hour?

As of Sep 2, 2026, the average hourly pay for senior javascript developer in Downingtown, PA is $62.63, according to ZipRecruiter salary data. Most workers in this role earn between $56.11 and $71.30 per hour, depending on experience, location, and employer.

What is a senior JavaScript developer?

A Senior JavaScript Developer is a highly experienced programmer specializing in JavaScript, including frameworks like React, Angular, or Node.js. They are responsible for designing, developing, and optimizing web applications, ensuring high performance and maintainability. Additionally, they provide technical leadership, mentor junior developers, and collaborate with cross-functional teams to deliver scalable solutions. Strong problem-solving skills, deep knowledge of JavaScript best practices, and experience with modern development tools are essential for this role.

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

To thrive as a Senior Javascript Developer, a strong command of JavaScript (including ES6+), advanced front-end frameworks (like React, Angular, or Vue), and back-end technologies (such as Node.js) are essential, along with several years of professional coding experience. Familiarity with version control systems (like Git), CI/CD pipelines, and relevant certifications (e.g., AWS Certified Developer or JavaScript certifications) is highly valued. Excellent problem-solving abilities, mentorship skills, and effective communication help developers collaborate and lead within cross-functional teams. These skills enable Senior Javascript Developers to build robust applications, guide junior team members, and drive innovation in fast-paced tech environments.

What are typical challenges faced by senior JavaScript developers in day-to-day work?

Senior Javascript Developers often encounter complex challenges such as optimizing web application performance, ensuring code scalability and maintainability, and integrating with diverse APIs and services. They are also expected to troubleshoot legacy code and address security vulnerabilities, all while keeping up with the rapidly evolving JavaScript ecosystem. Collaborating with designers, product managers, and junior developers can add layers of complexity to project requirements. However, overcoming these challenges is rewarding and provides opportunities to shape technical strategy and influence best practices within the team.

What job categories do people searching Senior Javascript Developer jobs in Downingtown, PA look for?

The top searched job categories for Senior Javascript Developer jobs in Downingtown, PA are:

What cities near Downingtown, PA are hiring for Senior Javascript Developer jobs?

Cities near Downingtown, PA with the most Senior Javascript Developer job openings:

Senior Javascript Developer jobs near you
Infographic showing various Senior Javascript Developer job openings in Downingtown, PA as of June 2026, with employment types broken down into 67% Full Time, 23% Part Time, 3% Temporary, and 7% Contract. Highlights an 78% Physical, 4% Hybrid, and 18% Remote job distribution, with an average salary of $130,279 per year, or $62.6 per hour.

Senior .NET Developer Optimizely

Horizontal Talent

Wilmington, DE • Remote

$53 - $69.75/hr

Full-time

Posted 22 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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