Growth-Focused Senior Web Developer (Marketing Site) — Remote

OnPay, Inc.; Atlanta (GA); Remote; USD 135,000 - 150,000; Full time

Benefits offered by this job

4 weeks PTO

Paid holidays

Medical/Dental/Vision coverage

Disability & Life Insurance

Fertility Benefits

Parental Leave

401(k) with company match

Job summary

OnPay is actively seeking a Senior Web Developer, Marketing to own OnPay.com end-to-end—from WordPress themes to tracking, experimentation, and site performance. You will work with Growth Marketing, Web/CRO, Content, and Analytics to deploy fast, accessible, and secure experiences that convert visitors into customers.

You’ll lead technical decisions, implement pixels, and optimize for growth while maintaining clean code and reliable infrastructure. Remote work within the U.S.

Qualifications

• 5+ years of web development experience, ideally owning a marketing website in a B2B SaaS company.
• Strong proficiency with HTML, CSS or SCSS, JavaScript, PHP, and MySQL, and experience with a modern JavaScript framework such as React.
• WordPress experience, including custom themes, Gutenberg blocks, and plugins. Advanced Custom Fields experience is a plus.
• Hands-on experience implementing tracking with Google Tag Manager and GA4, including pixels, conversion events, and a data layer.
• Experience setting up, QAing, and launching A/B and multivariate tests on a platform such as VWO or Optimizely, and a working understanding of CRO.
• Experience building custom code and integrations in HubSpot, Zapier, or similar automation platforms.
• Experience with WCAG accessibility, Core Web Vitals, website performance, and website security.
• Understanding of SEO best practices and how site structure and schema affect search and AI discovery.
• Experience using AI tools to accelerate development, QA, testing, debugging, or automation.
• A portfolio or examples of websites, tools, experiments, or integrations you personally built and the results they produced.
• Bachelor’s degree in Computer Science, Web Development, or a related field preferred, or equivalent practical experience.

Responsibilities

• Own the development, maintenance, and documentation of OnPay’s marketing website, landing pages, forms, calculators, and interactive tools in WordPress, including custom themes, blocks, and plugins.
• Launch landing pages, campaigns, and web requests across Marketing and other business teams efficiently. Prioritize with the VP, flag tradeoffs early, and maintain strong delivery velocity.
• Partner with Web/CRO, Content, Performance Marketing, and Marketing Analytics to turn hypotheses into well-instrumented A/B and multivariate tests. Own technical setup, QA, launch, and implementation of winning experiences.
• Own the technical implementation and QA of pixels, tags, conversion events, and the data layer using Google Tag Manager and GA4, partnering with Marketing Analytics and RevOps on measurement definitions and source-of-truth reporting.
• Build forms, webhooks, integrations, and custom workflow actions across HubSpot, Zapier, and other systems.
• Keep the site fast, accessible, and secure, including Core Web Vitals, WCAG standards, reCAPTCHA, and privacy and consent settings.
• Evaluate our site architecture, developer tooling, and workflows and recommend improvements with a clear business case.
• Use AI and automation to speed up development, QA, testing, and troubleshooting, and review the output before it ships.
• Proactively identify opportunities to improve site performance, tracking, conversion, and development efficiency.

Skills

HTML/CSS

JavaScript

React

WordPress

SEO

A/B testing

AI tooling

Analytical thinking

Education

Bachelor’s degree in Computer Science/Web Development

Tools

WordPress themes

Gutenberg blocks

Plugins

HubSpot

Zapier

GA4/Tag Manager

VWO/Optimizely

Job description

OnPay is actively seeking a Senior Web Developer, Marketing to own OnPay.com end-to-end—from WordPress themes to tracking, experimentation, and site performance. You will work with Growth Marketing, Web/CRO, Content, and Analytics to deploy fast, accessible, and secure experiences that convert visitors into customers.

You’ll lead technical decisions, implement pixels, and optimize for growth while maintaining clean code and reliable infrastructure. Remote work within the U.S.