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Resume

Sage Gatzke

Senior Software Engineer

Greater Los Angeles Area, CA

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Professional summary

Senior Software Engineer with 10+ years of experience specializing in frontend development, UX design, and technical modernization. Expert in React, TypeScript, Next.js, and state management patterns, with a proven track record of leading architectural initiatives and designing user-centered interfaces. Skilled in end-to-end product design, DevX optimization, establishing best practices, and mentoring engineering teams.

Experience

LUCI Systems LLC
Senior Software Engineer

Las Vegas, NV (Remote)

Oct 2023—Feb 2026

  • Championed and led comprehensive V2 UI modernization initiative, migrating entire codebase to TypeScript and implementing modern state management patterns (Zustand, React Query, Zod) to replace tightly coupled MobX State Tree architecture, eliminating cascading useEffect bugs and improving maintainability.
  • Redesigned and redeveloped interactive map view and architected mobile-responsive list view with advanced filtering, providing enhanced visibility into device configurations and real-time status updates for streamlined device management.
  • Designed and implemented all UI/UX independently, creating intuitive user flows and visual designs. Leveraged AI-assisted design exploration to rapidly create interactive design prototypes that accelerated feature development.
  • Rebuilt form architecture using React Hook Form with Zod validation and React Query for data synchronization, creating consistent, type-safe data handling patterns across database workflows while managing real-time device state.
  • Developed automated Lighthouse testing framework to track performance metrics across releases, improving scores from 40-50% to 80%.
  • Helped maintain and extend E2E test suite to over 100 user flows, establishing quality assurance practices for a platform managing real-time audio/visual device control.
  • Implemented user state persistence feature allowing configurable session behavior (resume, fresh start, or saved state), improving user experience for operators.
  • Redesigned blue-green deployment UI to follow best practices for state handling (loading, error, success states) and established visual cohesiveness with the design system.
  • Built admin features including system logging, settings management, and feature flag controls for operations and debugging.
  • Helped onboard and mentor new team members, writing comprehensive documentation for UI best practices and providing guidance on company processes.

Skills

ReactTypeScriptNext.jsZustandReact QueryZodReact Hook FormTailwind CSSShadcn UIE2E TestingLighthouse
Doma
Senior Software Engineer

San Francisco, CA (Remote)

Nov 2021—Apr 2023

  • In just three months, successfully led the frontend development on a proof of concept (POC) project, collaborating closely with cross-functional teams, including backend and data science, design, and clients. Key contributions include defining all frontend tickets, establishing design language standards, and working through user flows to create a functional prototype that was shipped and utilized by multiple clients.
  • Collaborated with product and design teams to implement a portal for Escrow Officers, Real Estate Agents & Sales Reps and then continually delivered new features.
  • Helped define best practices, created a reusable component library, and collaborated with design to review and document new components, patterns, and styles as a member of Doma's design system team.

Skills

ReactDesign SystemTypescriptStorybookMaterial-UIMicrosoft Office Add-InNode
CBRE
Senior Software Engineer

Seattle, WA

Oct 2018—Nov 2021

  • Architected and implemented the frontend for the product to platform initiative, using micro-frontends with multiple internal shared libraries.
  • Created, maintained, and engaged in outreach for the internal design systems with versioning and documentation.
  • Collaborated with product and design teams to implement new features and increased test coverage from 50% to 90%.
  • Migrated Angularjs app to React, implemented new features, increased testing.
  • Mentored interns and junior engineers.

Skills

ReactTypescriptReduxMicro frontendsDesign SystemAngularjsLernaNX
Ministry of Product
Software developer - Ministry of Product

Seattle, WA

Sep 2016—Jan 2019

  • Designed and developed Ionic 2+ applications with various features such as streaming audio, geo-fencing, time tracking, Fitbit integration, chat, notifications, and charts. Utilized multiple native plugins to enhance the functionality of these apps.
  • Created Typescript Express API specifically for Ionic apps, utilizing JWT, Mongo, and Firebase for notifications.
  • Built prototypes for clients and internal projects for iOS and Android platforms.

Skills

IonicIonic2AngularjsAngularJavascriptTypescriptExpressNode
Puget Works
Software Developer

Seattle, WA

Dec 2015—Apr 2016

  • Created an Ionic 1 app prototype for a client.

Skills

AngularjsMondoDBExpressJavascriptCSS
Trupanion LLC
IT Intern

Seattle, WA

Sep 2014—Jan 2015

  • Built an MVC C#/js app for updating settings in apps or sites for multiple environments.
  • Built a visual studio extension wizard for creating company specific boilerplate projects dynamically.
  • Built a WPF application that used Jira web services to save information for compliance reports.

Skills

C#, Javascript.NETCSS
Ososlo LLC
​Web developer and tester

San Luis Obispo, CA (Remote)

Nov 2013—Feb 2014

  • Installed and tested plugins for a Magento e-commerce website.

Skills

JavaScriptPHPMagento
World Health Organization
C# Programmer

Seattle, WA

Apr 2013—Dec 2013

  • Built a ClickOnce application that interacted and updated specific WHO applications.

Skills

C#
Seattle Central College
​Teacher Assistant/Tutor

Seattle, WA

Mar 2012—Jun 2013

  • Teacher's assistant for Java, Android, PHP, C#, JavaScript, ASP.NET, WordPress, Theory of Design.
  • Helped create lesson plans, provided tutoring

Skills

AndroidJavaC#PHPWordpressJavascriptDesign

Education

  • Western Governors University
    Bachelor of Science · Software Development

    Seattle, WA

    2015-2017

  • Seattle Central College
    Associate of Science · Software Programming, Web Development

    Seattle, WA

    2012-2015