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.

• Sole owner of the full technical platform: architecture, implementation, release pipeline, and the live releases on the App Store and Google Play.
• Built the app end-to-end on Flutter/Dart for both Android and iOS with Clean Architecture + BLoC and a layered data model (DTO / Entity / Model), backed by Firebase (Firestore, Storage, Authentication, Analytics, Crashlytics).
• Implemented the in-app purchase layer for both stores (in_app_purchase) — purchase verification flow and entitlement persistence, a non-trivial native integration on Android and iOS, with store-side product configuration live in both stores.
• Built dynamic multi-language support (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 core features (interactive quiz system, multimedia guides, and payment flows) using Test-Driven Development (TDD) to ensure robust offline synchronization and application reliability.
• Scaled output as a solo developer through an AI-first workflow leveraging Claude Code and Cursor alongside custom skill packages, terminal command loops, and structured AGENTS.md / DESIGN.md patterns.

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

• Technical lead and architect of the internal Android Ads SDK powering monetisation across OLX's three consumer verticals (Horizontals, Real Estate & Motors), each shipping market-specific builds, serving tens of millions of active users — integrating ad demand primarily through Google Ad Manager alongside additional third-party ad-network SDKs.
• Designed an api/impl module separation pattern enforcing strict dependency boundaries — improved build times and made partner-team integrations safer and more predictable; standardised the build with Gradle convention plugins, version catalogs, and composite builds.
• Drove privacy-first decisions across the SDK: consent state management (IAB TCF, Google UMP), scoped tracking, GDPR and Android Privacy Sandbox compliance.
• Led migration of critical SDK surfaces from XML to Jetpack Compose and from callback-based async to Kotlin Coroutines & Flow, while maintaining backward compatibility.
• Leveraged Test-Driven Development (TDD) with JUnit and MockK to design the SDK APIs, ensuring zero regression across host apps — raised SDK test coverage from 14% to 70%.
• Owned SDK lifecycle end-to-end: versioning strategy, AAR packaging and publication via Maven Publish to Artifactory and Maven Central, integration documentation, and mentoring partner-app teams.
• 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 full app end-to-end: architecture, feature delivery, and production stability across a heterogeneous device base.

• 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.