Resume
Justin Joseph
Product and platform engineer for JavaScript-heavy teams that care about interaction quality, performance, delivery speed, and systems resilience.
Summary
I work at the seam between product UX and systems architecture. My strongest fit is with teams building JavaScript-heavy products where interface quality, performance, auth/state complexity, and delivery rigor all matter at the same time.
Key Results
- Improved Shopify checkout abandonment from approximately 94% to approximately 84% through targeted storefront performance work.
- Helped unlock growth from approximately EUR 20k to approximately EUR 200k after performance and conversion improvements.
- Modernized a ~700k LOC legacy platform from .NET 4 to .NET 8 while untangling auth, tenancy, and reliability issues.
- Reduced Azure spend from approximately $7,800/month to approximately $2,400/month through architecture rationalization.
- Delivered mobile loyalty app foundations across Flutter, React Native (Expo), and Firebase.
Experience
Claer & Volker - CTO
Subcontract engagement supporting Aladon platform work
- Led modernization work across runtime migration, identity architecture, platform reliability, and cloud cost reduction.
- Designed tenant lifecycle changes in Keycloak and cleaned up session/licensing flow behavior.
- Stabilized concurrency-heavy execution paths and production release posture.
- Brought systems thinking that maps well to state-heavy frontend products and auth-aware SaaS interfaces.
Selected Projects
- Shopify Performance Stabilization: conversion-linked performance optimization in a JavaScript-heavy storefront.
- Abantu Loyalty App: product delivery across React Native (Expo), Flutter, Firebase, auth, rewards, and campaign messaging.
- ACTOR (Aladon): large-scale platform modernization with identity, tenancy, session, and runtime complexity.
- Onsite ANPR Reliability: edge runtime stabilization, deployment safety, and operational telemetry.
Skills
JavaScript / Product
JavaScript, Astro, Tailwind CSS, Shopify Liquid, storefront performance, React Native (Expo), Flutter, Firebase, UI architecture, motion systems, progressive enhancement, product-oriented performance profiling.
Platform / Delivery
.NET 8, Blazor Server, EF Core, multi-tenant architecture, Keycloak, concurrency correctness, Azure Web Apps, Azure SQL, Azure VMs, Linux (Debian/Ubuntu), WireGuard, SSRS, cPanel/WHMCS, DNS, SSL, Supabase, PocketBase, Budibase.
Contact
- Email: justin@kernelworks.site
- LinkedIn: https://www.linkedin.com/in/justin-devs/
- Location: Pretoria, South Africa
- Timezone: SAST (UTC+2)