Senior Android Engineer - Platform

Wallapop is a Barcelona based scale-up driven by the purpose to empower people to embrace a more conscious and human way of consumption. We believe in a world where collaborative economy is mainstream. This is what drives us. 💫 Wallapop operates in Spain, Italy and Portugal, offering a catalogue of several hundreds of millions of products and services. Powered by technical innovation and continuous improvement, we bring together the scale & trust of classifieds with the marketplace’s convenience & reach. 🌱 Our mission is to enable a connected trade ecosystem, making 2nd-hand the norm through smart use of technology. The Challenge 🧩 You will join the Android Platform Team , the engine room that enables our mobile engineers to ship features to millions of users with speed and confidence. In a 10+ year-old codebase with 50+ modules, your mission is to eliminate friction and build the foundation of our mobile future. What you will find: Developer Experience (DevEx) at Scale: You won’t just build features; you will build the tools, CI/CD pipelines, and architectures that other engineers use daily. Deep Tooling & Build Systems: We manage a complex modular environment where Gradle and CI/CD automation are at the heart of everything we do. System-Level Thinking: From optimizing build time to managing our Dagger/Anvil DI graph, you’ll tackle challenges that impact the entire Android Chapter. Data-Driven Infrastructure: We don't guess; we measure. You will use metrics to identify bottlenecks in the development lifecycle and prioritize what to fix next. What You Will Do 👇 You’ll be the "Engineer for the Engineers," driving technical excellence across the organization. To do so, you will: Master the Build System: Maintain and optimize our Gradle configuration, plugins, and build logic to ensure fast and reliable builds. Optimize the Feedback Loop: Improve CI/CD pipelines and local iteration speed to ensure developers can test and deploy code faster. Own the Release Engine: Maintain and evolve our automated release process , ensuring that shipping to millions of users is a non-event. Standardize & Modernize: Help define the "Golden Path" for Android development, providing the modular architecture and patterns that teams need to succeed. Cross-Platform Collaboration: Work alongside iOS and Web Platform engineers to align on tooling, infrastructure, and DevOps culture. Infrastructure as Code: Manage and scale our cloud resources (using AWS when needed) to support our mobile infrastructure. What We’re Looking For 🔎 Android Enthusiast & Expert: Deep knowledge of the Android SDK and Kotlin. You don't just use libraries; you understand how the system works under the hood. Build System Mastery: Extensive experience with Gradle (writing custom plugins, optimizing build scripts, and understanding the configuration phase). The "Platform" Mindset: A passion for Developer Experience (DevEx) —you find joy in making your colleagues' lives easier and their builds faster. Performance & Stability: Experience using profilers and monitoring tools to debug complex issues like memory leaks, ANRs, or slow startup times. Modularization at Scale: Proven experience managing large-scale, multi-module projects and understanding the trade-offs of different architectural patterns. CI/CD & Automation: Solid experience with CI tools (GitHub Actions, Bitrise, etc.) and a pragmatic approach to automating the full release lifecycle. Polyglot Curiosity: Comfortable using Python for scripting and an interest in learning AWS infrastructure when needed. What Would Be A Plus 🚀 Experience with Gradle Enterprise (Develocity) or writing custom Gradle plugins. Knowledge of Infrastructure as Code (IaC) or basic AWS management. Previous experience in a Developer Experience (DevEx) or Mobile Infra role. Experience managing Design Systems from an infrastructure perspective (theming engines, token automation). Do note that all our jobs are 📍 Barcelona based. We follow a hybrid m...