DAVID RUIZ URRACA

A recognised Flutter app turning Museo del Prado's permanent collection into a self-guided digital experience — recipient of the Art-Tech 2025 Honorable Mention and selected for the Santander X Explorer 2026 programme.

• Own the full technical platform as the sole developer: architecture, implementation, release pipeline, and the live releases on the App Store and Google Play.
• Built the Android and iOS applications end to end with Flutter/Dart, Clean Architecture, BLoC, and a layered DTO / Entity / Model data structure backed by Firebase (Firestore, Storage, Authentication, Analytics, Crashlytics).
• Implemented the in-app purchase platform for both stores (in_app_purchase), including purchase verification and entitlement persistence — a non-trivial native integration on Android and iOS, with store-side products live on both platforms.
• Built dynamic localisation (Spanish & English live, with Italian, French, and Portuguese planned) and adaptive UI for a content-heavy museum experience with SVG assets and custom typography. Also built the internal content-administration back office in Flutter Web — an operator-only tool, never exposed to end users.
• Developed interactive quizzes, multimedia guides, payment flows, and offline synchronisation using Test-Driven Development (TDD) to support application reliability.
• Run Firebase A/B tests across onboarding, content presentation, and conversion flows.
• Scale solo delivery through an AI-first workflow using Claude Code and Cursor, custom skill packages, terminal-integrated command loops, automated test-debug cycles, and structured AGENTS.md / DESIGN.md patterns.

Android platform engineering for a global marketplace operating across Poland, Portugal, Turkey, Ukraine, Romania, India, Indonesia, South America, and other markets.

• Owned the internal Android Ads SDK as a mobile platform, powering monetisation across OLX's Horizontals, Real Estate & Motors verticals. Each vertical shipped market-specific builds serving tens of millions of active users, with ad demand integrated primarily through Google Ad Manager alongside additional third-party ad-network SDKs.
• Served as the SDK's technical lead and sole Android engineer for most of its lifecycle, leading a temporarily expanded Android team during higher-load periods.
• Designed the api/impl module boundary to enforce dependency isolation, make partner integrations safer and more predictable, and improve build performance; standardised builds with Gradle convention plugins, version catalogs, and composite builds.
• Led privacy-first SDK decisions covering consent-state management (IAB TCF, Google UMP), scoped tracking, GDPR, and Android Privacy Sandbox technologies (Topics API, Protected Audience, Attribution Reporting).
• Led migration of critical SDK surfaces from XML to Jetpack Compose and from callback-based asynchronous code to Kotlin Coroutines & Flow, while maintaining backward compatibility.
• Applied Baseline Profiles and Macrobenchmark to improve startup performance and reduce jank on critical SDK-hosting surfaces.
• Used TDD and automated testing (JUnit, MockK, Robolectric, Espresso, MockWebServer) to design the SDK APIs — raised SDK test coverage from 14% to 70%, with Detekt and ktlint enforcing code quality.
• Owned the SDK lifecycle from versioning and AAR packaging through Maven Publish distribution to Artifactory (JFrog) and Maven Central, integration documentation, and partner-team enablement.
• Contributed cross-team feature work on consumer apps, reinforcing SDK integration patterns from the consumer side.
• Collaborated closely with international teams across OLX's offices in Istanbul, New Delhi, Poznań, and Lisbon — coordinating integration and delivery across time zones and markets.
• Led cross-platform coordination with the iOS SDK team to synchronize API designs, telemetry schemas, and release lifecycles, establishing a unified integration standard for client teams.
• Integrated GraphQL-based APIs for data fetching in consumer-app feature work.
• Wrote my first Flutter code here, building cross-platform features alongside the native Android work — a foundation later deepened on Explora Prado.
• Tracking and analytics integration: Amplitude, CleverTap, Google Analytics, Crashlytics.

Live-music events discovery and ticketing platform. Joined as the company's only Android developer and owned the application end to end across architecture, feature delivery, and production stability.

• Inherited a legacy Java codebase built on deprecated libraries (Dagger 1); stabilised it and shipped new features during an initial support phase.
• Led and built a ground-up rebuild ("v2") in Kotlin with Dagger 2 on MVVM / Clean Architecture, replacing the legacy Java/Dagger 1 app — a foundation that still underpins the company's product today, 6 years after my departure.
• Built with Room, LiveData, ViewModels, and Coroutines, with Glide for image loading and Firebase for push notifications, analytics, and Crashlytics.
• Integrated Stripe and Redsys payment gateways for ticket purchases and the Google Maps SDK for event discovery and venue geolocation.
• Implemented Test-Driven Development (TDD) as a core practice to ensure high reliability and a regression-free codebase during the rebuild.
• Coordinated directly with the iOS developer to align feature contracts, analytics schemas, and release cycles, driving joint initiatives to unify product behavior across both platforms.