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 model where flexibility rules. We commit to a minimum of 6 days per month in the office. Each team self-organizes to decide on cadence and in-person/remote rituals.

Wallapop is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees as we want Wallapop to be a place for everyone.

We sponsor visa processes for international candidates when applicable and provide legal & admin support along the process combined with a competitive relocation package.

Additionally to the opportunity to contribute to an agile product set up and work together towards achieving our meaningful mission, we offer the following 🍭 Perks & Benefits:

• Generous individual learning budget of 2k per year


• Free office meals, lunch selection from different providers


• Group and individual English, Catalan & Spanish lessons as part of our working day


• Private Health Insurance with Alan


• Flexible working hours + short Fridays


• Flexible remuneration to deduct from gross salary (kindergarten/food/transport check)


• Gym & Wellness plan, including physiotherapist in the office


• Generous referral Program & Charity Donation


• Bonus for weddings & newborns


• Wallapop Renta (Tax income support)


• Monthly plan for free shipping, bumps & home-pick-up on our services


• Work anniversary Gifts and Birthday Surprises


• Contribution towards your WIFI in your monthly payroll


• One-off payment based on compensation package to go towards setting up your home office


• Relocation package (monetary support and legal advice) and visa sponsorship, if applicable


• 26 holidays per year


• TOP hardware of your choice (latest Apple or Windows)

What does the hiring process for this position look like? 👀 **Please, note that all interviews take place remotely over hangouts.**

• Intro Call - run by Talent Acquisition, focus on providing more information about the role and the company as well as going over your experience, motivation, and expectations. This usually takes 45-60 minutes.


• Technical Task - you will be assigned a test that consists of a coding challenge to assess the technical skills required for the role. You will have up to 7 days to complete it. If you have a recent project that meets the same requirements, you can submit it instead.


• Expertise Interview - run by the core team, focusing on the hard skills and the ability to deliver in a given context. This usually takes 60-90 minutes.


• Stakeholder Interview - run by the hiring team and relevant stakeholders, focus on the ability to collaborate & deliver in a cross-functional set-up. This usually takes 60 minutes.


• Culture Interview - run by culture interviewers, focus on adherence to Wallapop's purpose and business proposition. This usually takes 60 minutes.


• Offer - should you be the right candidate, your offer will be discussed over a call with talent acquisition and will then be confirmed in writing.