Oscar – Kotlin, Android, Java

A language-access platform that connects clinical staff to professional interpreters on demand.

• Built and shipped features concurrently across native Android and iOS applications using Kotlin, Jetpack Compose, Swift, and SwiftUI.
• Owned real-time audio and video integrations with Twilio and Amazon Chime.
• Refactored both codebases to eliminate duplication and improve release stability.
• Increased automated test coverage from below 10% to more than 70%.
• Established CircleCI pipelines to make releases predictable for a point-of-care product.

A delivery application where couriers and customers coordinate in real time during an active order.

• Modernized a legacy Android application supporting a medical delivery platform.
• Developed features that improved performance, stability, and maintainability.
• Introduced unit testing and CI/CD practices to reduce regressions.
• Expanded automated test coverage for a Kotlin and Jetpack Compose delivery application with real-time communication.
• Collaborated closely with QA and product teams to stabilize releases under tight deadlines.

A native iOS payments SDK for an employee-benefits product operating in 31 countries, serving around 36 million consumers across 1.7 million merchants.

• Developed and maintained a native iOS SDK for card digitization and in-app payments.
• Supported country engineering teams integrating the SDK into their consumer applications.
• Diagnosed and resolved integration issues within applications outside direct control.
• Maintained strict backward compatibility across versions used by multiple independent apps.
• Delivered secure, high-quality software aligned with regulated fintech standards.

A digital payments platform used by banks and card issuers for tokenisation, card digitisation and wallet provisioning to Apple Pay, Google Pay and Samsung Pay, across roughly 300 million active cards.

• Led digital-payment development for fintech partners across Latin America.
• Built native iOS and Android plugins and SDKs for third-party issuer applications.
• Implemented card digitization and wallet provisioning flows for Apple Pay, Google Pay, and Samsung Pay.
• Used NFC, Android Keystore, and StrongBox to secure payment credentials.
• Delivered payment-critical code for applications outside the team’s ownership and release control.

A clinical research application used to track cognitive and motor decline in study participants for a national health institute.

• Developed native iOS and Android applications for a clinical research protocol.
• Implemented offline-first data capture with Core Data to preserve sessions during connectivity loss.
• Integrated cardiac monitoring data from Apple Watch and Wear OS.
• Added Firebase Analytics and Crashlytics for usage insights and crash reporting.

Interactive applications, games and multimedia experiences built for global consumer brands and creative agencies, much of it for live events — software that runs at a fixed moment in front of an audience, with no possibility of shipping a fix.

• Built interactive applications, games, and multimedia experiences for Sony Music, Huawei, McCann, Ogilvy & Mather, and Banco de Bogotá.
• Delivered projects end-to-end, from initial scoping and proposals through development and launch.
• Developed software for live events where reliability at a fixed time was essential.
• Managed client engagements, proposals, project scope, and delivery as the company founder.