Remote, Denver Hybrid, Contract or Full-time

I design, build, and measure pages that convert.

Senior front-end engineer and designer

I've improve conversions across multiple product verticals, from analyzing behavior to shipping and A/B testing the fix.

Let's talkResumeRemote / Denver hybrid

david@davidnallen.comLinkedIn

React

Production UI

CRO

Focus

Funnel

Optimization

Denver, CO

Based In

Interfaces in production

What I bring to the seat

CRO

Consider multiple data-streams and create experiments for optimization and improvement. From hypothesis, to iteration, the measurement, and the conversion.

Design to production

On or off-brand implementation, ensuring that the final product aligns with the brand's identity or requirements.

React and Next.js

AI-assisted development in Cursor and Grok: components, pages, and the release that follows a spec.

JavaScript, CSS, and SCSS

JavaScript, CSS, and SCSS, including a Sass codebase that stays coherent as it grows.

Why hire me?

Production interfaces, measured events, conversion experiments, and a Sass codebase that stays coherent with the design spec. My approach combines technical expertise with a deep understanding of user needs.

01

Build

React and Next.js pages and components, built faster with AI-assisted tools and checked by hand. WordPress and Elementor with custom JavaScript when a marketing site has to ship this week. Everything matches the spec and runs on a Sass system that stays consistent.
02

Instrument

GTM dataLayer events on view, form start, and signup. UTM values that survive the redirect. A/B and multivariate tests set up so the result is trustworthy.
03

Improve

Read the funnel, change the component, measure again. In my latest role that loop lifted conversions 20% across multiple product verticals.

Experience snapshot

2010 – present

Owner / Creative Director

David N Allen Design

React and WordPress front ends through launch. A/B tests and analytics scored on leads and signup.

2024 – 2026

Senior UI/UX Specialist (CRO)

Simpler Trading

Designed, built, and A/B tested membership and webinar registration. Conversions lifted 20% across multiple product verticals. Owned the redirect, the UTM handoff, and the GTM dataLayer. Weekly release.

A release week

Spec, Sass, the page, the events, the test, and the ship. This is what owning the frontend looks like.

01

Design spec

The frame arrives with type, space, and the states the page needs. Matching it is how the week starts.
02

Sass

Tokens and components stay coherent with that spec. The new page uses the system that is already in the codebase.
03

The page

A membership offer, a webinar registration, or a pricing UI lands as a real page, with the layout and the JavaScript that make the decision obvious.
04

The events

GTM dataLayer events record the view and the signup. UTM values are still on those events after a redirect.
05

Testing

The path is exercised before it ships: the redirect, the parameters, the event, and the layout on a phone.
06

Ship it

It goes out in the weekly release. The next offer reuses the page, the events, and the Sass.

Recommendations

Rachel Cohen

Rachel Cohen

PMP, Certified Scrum Product Owner
I had the opportunity to work with David on a variety of website and development projects at Simpler Trading. David was always quick to jump in when something needed attention and willing to take initiative to identify opportunities for improvement. He brings a creative perspective to his work, particularly when it comes to UX/UI and finding ways to enhance the user experience.
Cody Huelster

Cody Huelster

Director of Sales
I worked with David Allen at Simpler Trading, and he's one of the most talented people I've worked with in marketing technology. He's an exceptional developer with a strong understanding of funnel design, conversion rate optimization, and how to build pages that help a business sell.
Contact© 2026 David N Allen. All rights reserved.

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