Senior iOS App Engineer

Yahoo serves as a trusted guide for hundreds of millions of people globally, helping them achieve their goals online through our portfolio of iconic products. For advertisers, Yahoo Advertising offers omnichannel solutions and powerful data to engage with our brands and deliver results. A Lot About You Yahoo Taipei is seeking iOS engineers who care about quality, user experience, and collaborative software development. You will be part of a team working on high-impact consumer-facing apps used by millions of users across Taiwan and Hong Kong. We value people who are curious, willing to take ownership, and who enjoy working with others to solve real problems, not just write code. Responsibilities Work with product managers and designers to deliver features with good user experience and performance. Participate in discussions and proactively contribute your technical and UX insights. Design, implement, test, and maintain scalable iOS codebases across Yahoo TW/HK consumer apps and sdks. Collaborate with Android engineers to ensure feature behavior consistency and cross-platform quality. Participate in code reviews and continuously improve codebase maintainability. Propose and drive improvements in app architecture, tooling, or release processes as needed. Minimum Qualifications BS or MS in Computer Science or related field. 3–5 years of experience in iOS app development with Swift and UIKit/SwiftUI. Solid understanding of Objective-C; able to read and modify Objective-C code in mixed codebases. Familiarity with common architectural patterns (MVVM, Clean Architecture, Coordinator, etc.). Able to read and navigate large codebases and work with legacy components. Experience working with APIs, networking, async data flow, and app performance tuning. Able to take initiative and seek clarity when requirements are ambiguous. Good communication skills and team collaboration habits. Comfortable working with Git, CI/CD workflows, and release processes. Requires business-level proficiency in English. Preferred Qualifications Experience contributing to refactoring or architectural improvements in a production codebase. Familiarity with writing unit/UI/integration tests. Experience working in cross-functional teams with product, design, and other platforms. Mindset for quality, ownership, and growing with the team. Yahoo is proud to be an equal opportunity workplace. All qualified applicants will receive consideration for employment without regard to, and will not be discriminated against based on age, race, gender, color, religion, national origin, sexual orientation, gender identity, veteran status, disability or any other protected category. Yahoo will consider for employment qualified applicants with criminal histories in a manner consistent with applicable law. Yahoo is dedicated to providing an accessible environment for all candidates during the application process and for employees during their employment. If you need accessibility assistance and/or a reasonable accommodation due to a disability, please submit a request via the Accommodation Request Form ( www.yahooinc.com/careers/contact-us.html ) or call +1.866.772.3182 . Requests and calls received for non-disability related issues, such as following up on an application, will not receive a response. Yahoo has a high degree of flexibility around employee location and hybrid working. In fact, our flexible-hybrid approach to work is one of the things our employees rave about. Most roles don’t require specific regular patterns of in-person office attendance. If you join Yahoo, you may be asked to attend (or travel to attend) on-site work sessions, team-building, or other in-person events. When these occur, you’ll be given notice to make arrangements. If you’re curious about how this factors into this role, please discuss with the recruiter. Currently work for Yahoo? Please apply on our internal career site.