Case Studies
Engineered for Impact: Shipped Systems & Case Studies
Concrete proof of technical ownership, transactional reliability, and modern full-stack architectures.
An organized selection of shipped apps, payment systems, and internal tools. Structured to help engineering recruiters and hiring managers quickly evaluate technical ownership, system outcomes, and production depth.
Mobile & B2B CommerceJun 2024
10,000+ Downloads
Digicorp DigiApp & Commerce Ownership
10,000+ Android downloads and sustained production continuity
KotlinVanilla JSFirebase
6 min
Transactional PaymentsJun 2024
~1,000 txs/day
Octopus Payments Platform - Cooperative Collections
About 1,000 daily service-collection operations in active cooperative contexts
FlutterAndroidREST APIs
6 min
Local-First Web AppNov 2025
Open Source / Next.js 16
Playfit Game Assistant
Decoupled monorepo architecture, public codebase, and automated quality checks
Next.js 16SupabaseIndexedDB
Additional Product Work
Supporting product work that helps round out how I think about modern product engineering.
Multi-Role B2B SaaSOct 2025
70 Pages / 37 Tables
MatchdayOS - Soccer Operations Platform
Role-based platform with 70 pages, 37 schema tables, and multi-role testing.
Next.js 15SupabaseTypeScript
Internal Community OpsDec 2019
100+ Active Users
Community Operations Platform - Iglesia Tiempo de Cambio
Reliable daily operations for 100+ active users
Google Maps APISQLRole Workflows
6 min
Personal PortfolioJun 2026
Open Source / Live Site
Next Portfolio Starter — Personal Portfolio
Live portfolio at carlos-arancibia.com with 31 automated tests and CI release gate
Next.js 16TypeScriptTailwind CSS