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Web Performance Engineering Lead

The Protein Works™ -
Liverpool

Quick apply

Job details

Full-time
2 days ago

Benefits

Cycle to work scheme
Company pension
Work from home
Private medical insurance
Employee discount

Qualifications

Technical troubleshooting
Performance tuning
Digital analytics tools
Google Tag Manager
Magento
E-commerce
Front-end development
A/B testing
Martech
AI
Google Analytics
Analytics

Full job description

Job Advert

We’re looking for a Web Performance Engineering Lead to take ownership of the technical performance of the Protein Works website.

This is a hands-on engineering role sitting at the point where Technology, ecommerce and performance marketing meet.

You’ll be responsible for making our website faster, more stable and easier to buy from, identifying the technical issues and opportunities that have the biggest impact on customer experience and commercial performance.

We’re looking for someone who thinks beyond whether a website simply “works”. You’ll care about every millisecond of load time, every unnecessary script, every broken tracking event and every point of friction standing between a customer landing on our website and completing their order.

You’ll report directly into the Sales & Marketing Director, giving you close access to our commercial priorities, performance data and experimentation roadmap. You’ll also work closely with our Technology Director, ensuring everything we build meets the technical standards required of a high-growth ecommerce business.

This role comes with genuine ownership. You’ll be expected to spot opportunities, investigate problems, build solutions and measure whether they made a difference.

About Protein Works

Protein Works is a high-growth DTC nutrition brand with a clear mission: help people live healthier, happier lives through the power of nutrition.

We are growing, investing and hiring with purpose. If you want to join a business with the energy of a challenger and the foundations of a market leader, this is the right moment to do it.

What You'll Do

Own front-end performance end to end across desktop and mobile, driving measurable improvements in Core Web Vitals (LCP, INP and CLS) on the journeys that matter most to revenue.
Dig into conversion data by device, browser, channel and journey to find where friction is costing us sales, then turn those findings into a prioritised, commercially weighted performance roadmap.
Build and run experiments, from quick front-end variants to full A/B tests and feature-flagged releases, and use the results to shape what we build next.
Protect our tracking and measurement, working closely with Marketing and Data to catch discrepancies in GA4, GTM and the data layer before they cost the business insight.
Review and control third-party scripts and marketing technology, challenging anything that slows the site down without earning its place.
Use AI-assisted engineering tools to work faster, and build the monitoring that catches performance and tracking regressions before they become commercial problems.

Ideal Candidate

Strong commercial front-end engineering experience (JavaScript/TypeScript, HTML, CSS, modern frameworks) and comfortable taking ownership of a high-traffic ecommerce website.
You genuinely know your way around Core Web Vitals and browser profiling tools such as Chrome DevTools, Lighthouse and WebPageTest, and can turn “why is this slow” into a shipped fix.
Practical experience with GA4, Google Tag Manager, consent management platforms and the wider martech stack; Magento or Adobe Commerce experience is a strong plus.
You don't wait for a perfectly written ticket before you start investigating something; you dig into the data, form a hypothesis and go find the answer yourself.
You can explain a complicated website issue to someone in Marketing without needing them to become an engineer first.
Restless about improvement: you know a website is never “finished,” and you're always looking for the next thing to make faster, simpler or easier for the customer.

Benefits

Exclusive staff discounts
Private healthcare
Birthday day off
Pension scheme
Unique bonus scheme
Cycle to work scheme
Access to retail discounts
Staff socials and events
State of the art PW Campus
WFH on Fridays
Refreshments on-site

Quick apply

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