ppWallapop 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. /ppWallapop 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. /ph3bThe Challenge /b /h3pYou will join the biOS Platform team /b, the team that sets the technical direction for iOS at Wallapop. Our users are primarily other engineers, and our mission is to supercharge their daily productivity while defending the quality and performance of our app. We own the build system, developer tooling, module architecture, testing infrastructure, and observability foundations that everyone else ships on top of. /ppWe work on a b10+ year-old codebase used by millions of people /b (~115 modules and over 20,000 Swift files), where every second shaved off a build is multiplied across the entire engineering chapter. /ppIn this role, byou will own app performance as a product metric /b—from launch time and responsiveness to memory footprint and app size. As an iOS Platform Engineer, you will have company-wide scope, acting as an architect, mentoring engineers across the chapter, and tackling our most complex technical challenges. /pullibBuild Infra: /b Bazel-based build system with remote caching/execution, paired with Tente (our in-house Go CLI and BSP server to support IDEs like VSCode, Neovim). /lilibCI/CD Testing: /b High-scale pipelines on Bitrise, a robust testing pyramid featuring Quick/Nimble, ~9,000 snapshot references, and Maestro E2E flows in the cloud. /lilibArchitecture UI: /b Simplified, TCA-inspired architecture built on RxSwift, custom dependency injection, UIKit, SwiftUI, and our Conchita design system. /lilibObservability AI: /b Deep tracing via Sentry and OpenTelemetry, automated PR quality gates, and AI-assisted workflows (AI code-review bot and repo-native agents). /li /ulh3bWhat You Will Do /b /h3ulliKeep builds fast, hermetic, and understandable as the codebase and the team grow. /liliBuild developer tooling that engineers actually enjoy using, and measure whether it moves the needle on daily productivity. /liliMaintain a healthy, fast, and trustworthy CI/CD and release pipeline, from PR checks to the App Store. /liliDefine, measure, and deliver on user-facing performance goals: app launch time, responsiveness, rendering smoothness, memory footprint, and crash-free rate. /liliProfile with Instruments on real devices and optimize at the binary level (main-thread startup work, dyld and static initializers, binary layout, and framework count). /liliOwn the observability stack (Sentry/OpenTelemetry)



to provide tracing and dashboards that engineers trust, and set up automated guardrails in CI to block regressions. /liliSet the module boundaries and structural design of the app, leading migrations that cross a hundred modules without freezing feature delivery. /liliDesign and lead our structural architectural evolution, including the transition from RxSwift toward modern Swift Concurrency (async/await, actors, Sendable). /liliPartner with feature teams as an enabler: unblock them, document the paths, and make "the right thing the easy thing" to do. /liliDrive technical decisions with chapter-wide impact through RFCs and hands-on prototypes, aligning product, design, and backend stakeholders. /liliMentor iOS engineers across the company, raising the technical ceiling of the entire engineering chapter. /li /ulh3bWhat We’re Looking For /b /h3ulliExtensive experience designing, developing, and scaling iOS applications in Swift. /liliA proven track record of working in large, highly modular codebases, and comfort navigating and refactoring code you did not write. /liliA platform mindset: treating other engineers as your users, measuring impact, and demonstrating a passion for developer experience. /liliDeep, hands-on experience with mobile performance profiling (Instruments) and a strong understanding of what makes an app fast and stable. /liliStrong autonomy and pragmatism, with the ability to scope massive technical migrations into safe, incremental, and highly strategic steps. /liliExcellent communication and mentoring skills, with experience writing RFCs and guiding broader engineering chapters. /liliFamiliarity with AI coding assistants (e.g., Claude Code, GitHub Copilot) and using AI to enhance development workflows. /li /ulh3bWhat Would Be A Plus /b /h3ulliExperience with Bazel (including remote caching/execution) or other non-Xcode build systems for Apple platforms. /liliDeep ownership of mobile CI/CD pipelines, code signing, and release automation. /liliScripting beyond Swift (Go, Python, Ruby, shell) and a knack for writing custom CLIs. /liliExperience with automated testing frameworks, snapshot testing, E2E frameworks, and flaky test triage at scale. /liliFamiliarity with AI coding assistants (e.g., Claude Code, GitHub Copilot) and adopting or developing harness engineering practices to make them reliable in a large codebase. /liliExperience working on large-scale, high-traffic consumer applications. /li /ulpDo 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. /ppWallapop 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. /ppWe sponsor visa processes for international candidates when applicable and provide legal admin support along the process combined with a competitive relocation package. /ppAdditionally to the opportunity to contribute to an agile product set up and work together towards achieving our meaningful mission, we offer the following bPerks Benefits /b: /pulliGenerous individual learning budget of 2k per year /liliFree office meals, lunch selection from different providers /liliGroup and individual English, Catalan Spanish lessons as part of our working day /liliPrivate Health Insurance with Alan /liliFlexible working hours + intensive Fridays /liliFlexible remuneration to deduct from gross salary (kindergarten/food/transport check) /liliGym Wellness plan, including physiotherapist in the office /liliGenerous referral Program Charity Donation /liliBonus for weddings newborns /liliMonthly plan for free shipping, bumps home-pick-up on our services /liliWork anniversary Gifts and Birthday Surprises /liliContribution towards your WIFI in your monthly payroll /liliOne-off payment based on compensation package to go towards setting up your home office /liliRelocation package (monetary support and legal advice) and visa sponsorship, if applicable /lili26 holidays per year /liliTOP hardware of your choice (latest Apple or Windows) /li /ulh3bHiring process /b /h3ullibIntro /b - 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. /lilibTechnical Task /b - 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. /lilibExpertise Interview /b - 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. /lilibStakeholder Interview /b - 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. /lilibCulture Interview /b - run by culture interviewers, focus on adherence to Wallapop's purpose and business proposition. This usually takes 60 minutes. /lilibOffer /b - should you be the right candidate, your offer will be discussed over a call with talent acquisition and will then be confirmed in writing. /li /ulpNote: This description excludes boilerplate application instructions and form fields. /p /p #J-18808-Ljbffr

📌 iOS Engineer - Platform (Barcelona)
🏢 Wallapop
📍 Barcelona