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James Southorn

Design Portfolio

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heading decoration

Car Throttle

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August 21, 2014

CarThrottle desktop and mobile designs
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Lead Product Designer

App Design

The Mission


Car Throttle was rapidly evolving from a blog into the "Reddit for cars." I was tasked with leading a complete overhaul of the web platform to support a growing community of millions, focusing on engagement, content discoverability, and brand identity.


The Challenge


The existing site suffered from technical debt and a fragmented user experience. We needed to transition from a static editorial layout to a dynamic, community-driven social platform that felt at home on mobile devices—where 60%+ of our audience lived.


Discovery & Insights


  • Behavioural Audit: Used Google Analytics to identify that "Community" and "User-Generated Content" were our fastest-growing but hardest-to-navigate areas.
  • Enthusiast Personas: Interviewed power users to understand what drove engagement. We found that "visual storytelling" (memes, car builds, and videos) was the core hook.
  • Mobile-First Constraints: Analysed device data to prioritise performance and thumb-friendly navigation, as our users were often browsing while on the go or at car meets.


The Solution


  • Community-Centric IA: Redesigned the information architecture to put "Communities" (sub-groups) at the heart of the navigation, making it easier for users to find their specific niche (e.g., JDM, Muscle Cars, F1).
  • Scalable Design Foundations: Before "Design Systems" was a buzzword, I established a library of functional patterns and components to ensure visual consistency across the platform.
  • Engagement Loops: Simplified the post-creation flow and improved the "feed" logic to encourage more frequent, high-quality user interactions.


The Impact


The redesign successfully transitioned Car Throttle from a static blog into a high-growth social ecosystem, providing the scalable foundation needed to become a global leader in automotive media.


10M+

Monthly Unique Users


Community-Led

Growth


Mobile-First

Resilience



carthrottle homepage

Read article

Top Gear for the Facebook generation

quote marks

The Guardian

https://tinyurl.com/carthrottle-article

Design Process


The Foundations


The original site was a "read-only" WordPress blog. To scale, we needed to understand where the friction was preventing community growth.


  • Documentation: Analytics & Heatmap Audit I used Google Analytics and Hotjar to identify that 60%+ of users were on mobile, but were struggling with long-form editorial layouts.
  • Documentation: Competitive Landscape I performed a deep-dive audit of Reddit and Top Gear, identifying a "white space" for a platform that combined high-end visuals with raw community interaction.
  • The Outcome: We shifted the Information Architecture from a "Category" model to a "Community" (Hub-and-Spoke) model, allowing users to follow specific car interests.



wireframes



The Social Pivot (UGC & Interaction)


Transitioning from a platform where editors wrote content to a platform where users created it. This required a massive rethink of the post-creation flow.


  • Documentation: Low-Fidelity Iteration I produced dozens of wireframe iterations for the "Submit Post" flow. The goal was to make uploading a photo of a car as fast as a "one-tap" experience for users at real-world car meets.
  • Documentation: Stakeholder Ideation I facilitated workshops with the engineering and commercial teams to ensure our new social "feed" logic balanced user engagement with advertising requirements.
  • The Outcome: A simplified, "mobile-first" interaction model that resulted in a significant spike in daily User Generated Content (UGC).



wireframes


responsive designs


homepage



Scaling for 10 million


As the audience reached 10 million monthly uniques, the technical debt and UI inconsistencies became a bottleneck.


  • Documentation: Functional Pattern Library Before modern design systems were standard, I established a centralised library of reusable UI patterns. I documented typography scales, button states, and grid systems for the dev team.
  • Documentation: Iterative Usability Testing I conducted continuous "speak-out-loud" testing on new UI features to ensure the platform remained accessible and intuitive as we added complexity (like Video and Polls).
  • The Outcome: We reduced "design-to-dev" handoff time by 40% and maintained a cohesive brand identity across the entire ecosystem.



Homepage feed design


Various page designs



Recent projects

PistonHeads Auctions

Launching PistonHeads Auctions, a new product on the popular automotive website.

Website Design

July 17, 2024

MindLabs app

Launching an iOS app to market for a new mental health startup.

App Design

November 16, 2022

Fresh Fitness Food app

Project to design an innovative app for the UK’s #1 bespoke nutrition service.

App Design

May 18, 2020

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Let’s work together

© 2026 JSouthorn Design Ltd. Company no. 11583776

logo
logo
logo
logo
logo
logo

James Southorn

Design Portfolio

decorative line
heading decoration

Car Throttle

heading decoration

August 21, 2014

CarThrottle desktop and mobile designs
dashed line
user icon

Lead Product Designer

App Design

The Mission


Car Throttle was rapidly evolving from a blog into the "Reddit for cars." I was tasked with leading a complete overhaul of the web platform to support a growing community of millions, focusing on engagement, content discoverability, and brand identity.


The Challenge


The existing site suffered from technical debt and a fragmented user experience. We needed to transition from a static editorial layout to a dynamic, community-driven social platform that felt at home on mobile devices—where 60%+ of our audience lived.


Discovery & Insights


  • Behavioural Audit: Used Google Analytics to identify that "Community" and "User-Generated Content" were our fastest-growing but hardest-to-navigate areas.
  • Enthusiast Personas: Interviewed power users to understand what drove engagement. We found that "visual storytelling" (memes, car builds, and videos) was the core hook.
  • Mobile-First Constraints: Analysed device data to prioritise performance and thumb-friendly navigation, as our users were often browsing while on the go or at car meets.


The Solution


  • Community-Centric IA: Redesigned the information architecture to put "Communities" (sub-groups) at the heart of the navigation, making it easier for users to find their specific niche (e.g., JDM, Muscle Cars, F1).
  • Scalable Design Foundations: Before "Design Systems" was a buzzword, I established a library of functional patterns and components to ensure visual consistency across the platform.
  • Engagement Loops: Simplified the post-creation flow and improved the "feed" logic to encourage more frequent, high-quality user interactions.


The Impact


The redesign successfully transitioned Car Throttle from a static blog into a high-growth social ecosystem, providing the scalable foundation needed to become a global leader in automotive media.


10M+

Monthly Unique Users


Community-Led

Growth


Mobile-First

Resilience



carthrottle homepage

Read article

Top Gear for the Facebook generation

quote marks

The Guardian

https://tinyurl.com/carthrottle-article

Design Process


The Foundations


The original site was a "read-only" WordPress blog. To scale, we needed to understand where the friction was preventing community growth.


  • Documentation: Analytics & Heatmap Audit I used Google Analytics and Hotjar to identify that 60%+ of users were on mobile, but were struggling with long-form editorial layouts.
  • Documentation: Competitive Landscape I performed a deep-dive audit of Reddit and Top Gear, identifying a "white space" for a platform that combined high-end visuals with raw community interaction.
  • The Outcome: We shifted the Information Architecture from a "Category" model to a "Community" (Hub-and-Spoke) model, allowing users to follow specific car interests.



wireframes



The Social Pivot (UGC & Interaction)


Transitioning from a platform where editors wrote content to a platform where users created it. This required a massive rethink of the post-creation flow.


  • Documentation: Low-Fidelity Iteration I produced dozens of wireframe iterations for the "Submit Post" flow. The goal was to make uploading a photo of a car as fast as a "one-tap" experience for users at real-world car meets.
  • Documentation: Stakeholder Ideation I facilitated workshops with the engineering and commercial teams to ensure our new social "feed" logic balanced user engagement with advertising requirements.
  • The Outcome: A simplified, "mobile-first" interaction model that resulted in a significant spike in daily User Generated Content (UGC).



wireframes


responsive designs


homepage



Scaling for 10 million


As the audience reached 10 million monthly uniques, the technical debt and UI inconsistencies became a bottleneck.


  • Documentation: Functional Pattern Library Before modern design systems were standard, I established a centralised library of reusable UI patterns. I documented typography scales, button states, and grid systems for the dev team.
  • Documentation: Iterative Usability Testing I conducted continuous "speak-out-loud" testing on new UI features to ensure the platform remained accessible and intuitive as we added complexity (like Video and Polls).
  • The Outcome: We reduced "design-to-dev" handoff time by 40% and maintained a cohesive brand identity across the entire ecosystem.



Homepage feed design


Various page designs



Recent projects

PistonHeads Auctions

Launching PistonHeads Auctions, a new product on the popular automotive website.

Website Design

July 17, 2024

MindLabs app

Launching an iOS app to market for a new mental health startup.

App Design

November 16, 2022

decorative line

Let’s work together

© 2026 JSouthorn Design Ltd. Company no. 11583776

logo
logo
logo
logo
logo
logo

James Southorn

Design Portfolio

decorative line
heading decoration

Car Throttle

heading decoration

August 21, 2014

CarThrottle desktop and mobile designs
dashed line
user icon

Lead Product Designer

App Design

The Mission


Car Throttle was rapidly evolving from a blog into the "Reddit for cars." I was tasked with leading a complete overhaul of the web platform to support a growing community of millions, focusing on engagement, content discoverability, and brand identity.


The Challenge


The existing site suffered from technical debt and a fragmented user experience. We needed to transition from a static editorial layout to a dynamic, community-driven social platform that felt at home on mobile devices—where 60%+ of our audience lived.


Discovery & Insights


  • Behavioural Audit: Used Google Analytics to identify that "Community" and "User-Generated Content" were our fastest-growing but hardest-to-navigate areas.
  • Enthusiast Personas: Interviewed power users to understand what drove engagement. We found that "visual storytelling" (memes, car builds, and videos) was the core hook.
  • Mobile-First Constraints: Analysed device data to prioritise performance and thumb-friendly navigation, as our users were often browsing while on the go or at car meets.


The Solution


  • Community-Centric IA: Redesigned the information architecture to put "Communities" (sub-groups) at the heart of the navigation, making it easier for users to find their specific niche (e.g., JDM, Muscle Cars, F1).
  • Scalable Design Foundations: Before "Design Systems" was a buzzword, I established a library of functional patterns and components to ensure visual consistency across the platform.
  • Engagement Loops: Simplified the post-creation flow and improved the "feed" logic to encourage more frequent, high-quality user interactions.


The Impact


The redesign successfully transitioned Car Throttle from a static blog into a high-growth social ecosystem, providing the scalable foundation needed to become a global leader in automotive media.


10M+

Monthly Unique Users


Community-Led

Growth


Mobile-First

Resilience



carthrottle homepage

Read article

Top Gear for the Facebook generation

quote marks

The Guardian

https://tinyurl.com/carthrottle-article

Design Process


The Foundations


The original site was a "read-only" WordPress blog. To scale, we needed to understand where the friction was preventing community growth.


  • Documentation: Analytics & Heatmap Audit I used Google Analytics and Hotjar to identify that 60%+ of users were on mobile, but were struggling with long-form editorial layouts.
  • Documentation: Competitive Landscape I performed a deep-dive audit of Reddit and Top Gear, identifying a "white space" for a platform that combined high-end visuals with raw community interaction.
  • The Outcome: We shifted the Information Architecture from a "Category" model to a "Community" (Hub-and-Spoke) model, allowing users to follow specific car interests.



wireframes



The Social Pivot (UGC & Interaction)


Transitioning from a platform where editors wrote content to a platform where users created it. This required a massive rethink of the post-creation flow.


  • Documentation: Low-Fidelity Iteration I produced dozens of wireframe iterations for the "Submit Post" flow. The goal was to make uploading a photo of a car as fast as a "one-tap" experience for users at real-world car meets.
  • Documentation: Stakeholder Ideation I facilitated workshops with the engineering and commercial teams to ensure our new social "feed" logic balanced user engagement with advertising requirements.
  • The Outcome: A simplified, "mobile-first" interaction model that resulted in a significant spike in daily User Generated Content (UGC).



wireframes


responsive designs


homepage



Scaling for 10 million


As the audience reached 10 million monthly uniques, the technical debt and UI inconsistencies became a bottleneck.


  • Documentation: Functional Pattern Library Before modern design systems were standard, I established a centralised library of reusable UI patterns. I documented typography scales, button states, and grid systems for the dev team.
  • Documentation: Iterative Usability Testing I conducted continuous "speak-out-loud" testing on new UI features to ensure the platform remained accessible and intuitive as we added complexity (like Video and Polls).
  • The Outcome: We reduced "design-to-dev" handoff time by 40% and maintained a cohesive brand identity across the entire ecosystem.



Homepage feed design


Various page designs



Recent projects

PistonHeads Auctions

Launching PistonHeads Auctions, a new product on the popular automotive website.

Website Design

July 17, 2024

MindLabs app

Launching an iOS app to market for a new mental health startup.

App Design

November 16, 2022

Fresh Fitness Food app

Project to design an innovative app for the UK’s #1 bespoke nutrition service.

App Design

May 18, 2020