Skip to content
Justin Diaz Design
Lead Product Designer — Los Angeles & Orange County, CA

Justin
Diaz.

Justin Diaz is a Lead Product Designer with 14 years in SaaS, Ad Tech, Creator/Influencer Marketing, and Utilities & Electric Vehicles. He leads design teams on large B2B/Enterprise products, designs with data, and builds design systems that lift other designers. Today he uses AI to design analytics dashboards and build internal tools and prototypes.

Justin Diaz

Work

Filter by employer

Smart Energy Water

Sr. Product Designer · Nov 2023 – Present
Password required
Customer Home, Redesigned Around AI ~60% of testers preferred it · shown at WE3 2025 under COSMOS · 7 QA rounds
Password required
From EV Charging to the Whole Home 3 years as design owner · 3 brands, 2 design systems, one app
Password required
Design System, Design Ops & Prototyping 0 token mismatches, Figma to code · 8 Figma plugins for designers · Prototype Studio in 10 weeks
Password required
Platform Readiness: iOS 26, Android Sizes & Foldables 3 platform shifts covered · 13 screens in Liquid Glass · 3 Android breakpoints
Password required
Other Work: SmartBX Mobile, Billing & Surveys SmartBX Mobile in 4 coded builds · AutoPay · surveys · admin tools

Designing for utilities and electric vehicles: a redesigned, hardware-integrated web and app experience that helped close 4x more deals, and a utility portal used by millions across web and mobile. I also drive design system consistency across SEW's products and use AI to build internal tools, components and prototypes.

sew.ai

Freelance

Product Designer (Contract)
Password required
Design System v2, Design Ops & Docs Site 95% of the app built on the system · 706 Figma variables · ~2,000 screens named

Part-time contract work for Buenro. I built their design system v2 from scratch, from Figma variables to every component, named to match the engineers' Flutter code, and I run design ops for the product team.

buenro.com

Linqia

Lead Product Designer · Jun 2022 – Jul 2023
Creating Design System & Implementing Automatic Payments Payout work cut ~40 hrs/cycle · payout errors → 0% · dev months → weeks
Content Workflow Review Review time days → hours · one review flow for every persona

Leading design for Linqia's creator and influencer marketing platform. I set the design team's standards and processes for working with engineering, and owned the core Workflow product, from content review to influencer payments.

linqia.com

Vungle (now Liftoff Mobile)

Lead Product Designer · Feb 2017 – May 2022
Creative Manager & Playable Upload +100 daily active users · 50+ accounts adopted · review 3–4 wks → 2–3 days
Ads Manager – Iterations – Reports, Campaigns, & Creative List +30% engagement · −40% custom-report time · −25% campaign-mgmt time
Ads Manager – Platform Self-serve advertiser platform build-out
Monetization Manager Self-serve monetization: SDK & placement setup

Five years at Vungle, from designer to design manager and back to hands-on design. I solely created the Advertiser and Monetization self-serve and admin products, managed product designers, design systems and career tracks, and left as Lead Product Designer: a solid individual contributor who still supported the other designers as their lead.

What happened next
  1. 2019Acquired by Blackstone
  2. 2021Merged with Liftoff
  3. 2026Went public on Nasdaq (LFTO)
liftoff.io

Bizness Apps (now BuildFire)

Sr. UI/UX Designer · Aug 2012 – Dec 2016
Mobile App Builder – Customize Homescreen Concept design tool: canvas, objects, layers, customization, animations
Reseller Partner Dashboard IA reorganization of the White-Label reseller admin
Events Mobile Application Feature Redesigned mobile events feature to modern standards

I redesigned Bizness Apps' entire suite of core products through iterative usability testing, modernizing a dated UI and cutting support requests by 40%.

What happened next
  1. 2018Acquired by Think3
  2. 2021Acquired by IgniteTech
  3. 2023Acquired by BuildFire
buildfire.com