{"id":603658,"url":"https://alion.io/job/mercari-senior-software-engineer-android-mobile-enablement-mercari","title":"Senior Software engineer, Android (Mobile Enablement) - Mercari","company":{"id":914,"name":"Mercari","domain":"mercari.com","url":"https://alion.io/company/mercari","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":{"grade":"A","score":85,"open_postings":112,"ghost_share":0.17,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":83,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Mobile","role_family":"Mobile","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Minato, Japan"],"countries":["JP"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Android SDK","optional":false},{"name":"CI/CD","optional":false},{"name":"Clean Architecture","optional":false},{"name":"GitHub","optional":false},{"name":"Gradle","optional":false},{"name":"Jetpack Compose","optional":false},{"name":"Kotlin","optional":false},{"name":"Kotlin Coroutines","optional":false},{"name":"Machine Learning","optional":false},{"name":"MVC","optional":false},{"name":"MVI","optional":false},{"name":"MVVM","optional":false},{"name":"Claude Code","optional":true},{"name":"Cursor","optional":true},{"name":"GitHub Actions","optional":true},{"name":"Java","optional":true},{"name":"Kotlin Multiplatform","optional":true},{"name":"MySQL","optional":true},{"name":"OpenAI Codex","optional":true}],"status":"live","first_seen_at":"2026-08-14T00:00:00Z","employer_posted_date":"2026-08-14","last_verified_at":"2026-10-19T02:53:52Z","board_verified":true,"closed_at":null,"days_open":66,"trust":{"level":"ok","repost_count":0,"flags":["company_stale"],"days_open":65},"description":"本ポジションは日本語JDの用意がありません。\nSenior Software engineer, Android (Mobile Enablement) - Mercari\nEmployment Status: Full-time \nWork Hours: Full Flextime (no core time) \nOffice: Roppongi\nFor more details, see the Overview of Our Positions section on our Careers site.\nAbout Mercari\nCirculate all forms of value to unleash the potential in all people\n\"What can I do to help society thrive with the finite resources we have?\" The Mercari marketplace app was born in 2013 out of this thought by our founder Shintaro Yamada as he traveled the world. We believe that by circulating all forms of value, not just physical things and money, we can create opportunities for anyone to realize their dreams and contribute to society and the people around them. Mercari aims to use technology to connect people all over the world and create a world where anyone can unleash their potential. For more information about Mercari Group’s mission, see Mercari’s Culture Doc\nOrganization/Team Mission\nMercari Engineering Principles\nMercari Engineering Principles are a shared understanding that serves as the foundation of engineering beliefs and behavior at Mercari. The Engineering Principles are designed to complement the organizational identity (Mercari’s mission, values, and culture) from an engineering viewpoint.\nThese principles ultimately help us achieve Mercari’s mission by defining the ideal state we seek to realize in the long term.\nPassion For The Product\nGrow Together\nSolve Through Mechanisms\nCollaborate Openly\nFor more details, please see the following link:\n Engineering Culture\nThe Mobile Enablement team transforms mobile development into a seamless, automated, and cross-platform ecosystem. Our mission is to deliver innovative features and user experiences to maximize product-facing impact for Mercari's business. We simplify engineering workflows, reduce repetitive tasks through automation/AI, and enable broader collaboration across teams.\nBy streamlining coding, testing, releases, and operations, we accelerate innovation and scalability, ensuring mobile development keeps pace with Mercari's global growth and business needs. Join us to redefine how we build and deliver the Mercari experience!\nAs a Mobile Enabler mainly focusing on the Android ecosystem, you will own and evolve the entire Android engineering ecosystem at Mercari, from lower-level platform capabilities to higher-level architectural decision-making, providing the best experience for our engineers and Mercari users.\nTech Stack\nAndroid Development: Kotlin, Jetpack Compose, Kotlin Coroutines & Flow\nBuild & Tooling: Gradle (Develocity), Android Studio\nAPI & Data: Protocol Buffers\nAI Tools: Claude Code, Codex, Cursor\nCI/CD: GitHub Actions, GKE\nSee here for more information about our mission and values.\nWork Responsibilities\nSpecific work responsibilities are listed below:\nPeriodically join your fellow product engineers in designing, implementing, and maintain high-quality Android features to understand their reality and define the best solutions for them.\nOwn end-to-end development for platform and architectural solutions, from requirements definition through architecture, implementation, testing, and release.\nLead architectural design for complex features and system components, ensuring maintainability, scalability, and reliability.\nOptimize app performance, startup time, memory usage, and stability across diverse devices and OS versions.\nWork closely with machine learning, backend, infrastructure, product, and design teams to deliver seamless mobile experiences, as well as other feature-owner Android engineering teams.\nTake ownership and evolve Mercari's mobile platform, SDKs, and shared modules used across teams.\nDrive high code quality through code reviews, automated testing, CI/CD improvements, and rigorous documentation.\nChampion engineering best practices and contribute to guidelines and standards across Client Engineering.\nStay current with the latest developments in Android, Kotlin, Android Views, Jetpack Compose, coroutines, and mobile architecture patterns.\nBring innovative ideas to improve user experience, developer experience, and operational efficiency.\nTake ownership of initiatives that span multiple teams, driving alignment and technical decision-making.\nMentor junior and mid-level engineers, helping strengthen the overall technical capabilities of the team and the engineering organization.\nUnique Challenges\nEnabling dozens of mobile engineers in delivering awesome experiences to our 20M+ users by leveraging a diverse skillset to provide the best mobile ecosystem.\nDeliver highly performant and reliable functionality in a fast-paced environment with complex product requirements.\nBridge consumer-grade UX expectations with robust engineering architecture and infrastructure.\nInfluence platform-wide technical strategy, shaping the future direction of Mercari's mobile and AI-native cross-platform ecosystem.\nLead cross-functional efforts in ambiguous problem spaces where user needs and technical constraints must be balanced.\nQualifications\nRequired Experience/Skills\nShared belief in the mission and values of the Mercari Group.\nBachelor's degree in Computer Science, Engineering, or equivalent practical experience.\nStrong proficiency in Kotlin and Android development frameworks (Jetpack libraries, Jetpack Compose, Android SDK).\nSolid understanding of mobile architecture patterns (MVC, MVVM, MVI, Clean Architecture, etc.).\nDemonstrated experience with large-scale mobile applications and complex codebases.\nExperience integrating with backend APIs and asynchronous/concurrent programming.\nStrong analytical and problem-solving skills; ability to navigate ambiguity.\nExcellent communication skills and ability to explain technical concepts clearly.\nPassion for building user-facing mobile products.\nPreferred Experience/Skills\nExperience with large-scale mobile apps serving millions of users.\nExpertise in performance optimization, instrumentation, and mobile observability (e.g., crash analysis, metrics).\nExperience with modern Android platform capabilities (e.g., Kotlin Multiplatform, Baseline Profiles, app performance tooling).\nContributions to open-source Android projects or active involvement in the mobile community.\nExperience driving technical initiatives across multiple teams or owning platform-level components.\nFamiliarity with CI/CD for mobile, automated testing frameworks, build systems (Gradle), and release management.\nUI/UX sensitivity and an eye for detail in crafting polished user experiences.\nLanguage \nJapanese: Independent (CEFR - B2) Optional\nEnglish: Independent (CEFR - B2) Required\nFor details about CEFR, see here.\nLearn More About Mercari Group\nCareers site: https://careers.mercari.com/en/ \nMercan: https://mercan.mercari.com/en/ \nSocial media: X / Linkedin \nIntroduction of CoreSRE\nHow to deal with legacy systems\n An example of DDL application to a special MySQL configuration\nRecruiting at Mercari\nAt Mercari Group, we value empathizing with and embodying the mission and values of the Group and each company. To promote the creation of an organization that maximizes the total amount of value exhibited by all members, we would like to understand the experience and skills of each candidate as accurately as possible.\nRecruiting cycle at Mercari Group\nApplication screening\nSkill assessment: For engineering positions, you will be asked to complete a skill assessment on HackerRank or GitHub. For non-engineering positions, you may be asked to complete an assessment depending on the position. (The timing of the assessment may coincide with the interview process.)\nInterview: The number of interviews may vary depending on the position.\nReference check: We will ask for online references around the timing of the final interview.\nOffer: Offers will be determined carefully in consideration of the final interview and the reference check.\nLearn more about our recruiting process here.\nEqual Opportunity Hiring\nHere at Mercari, we work to realize a world in which no one’s potential is limited by their background and everyone has the opportunity to freely create value. We also firmly believe that a mindset of Inclusion & Diversity is essential for us to achieve our mission.\nThis, of course, extends to our hiring practices as well. Mercari is committed to eliminating discrimination based on age, gender, sexual orientation, race, religion, physical disability, and other such factors so that anyone who shares our mission and values can join us, regardless of their background. 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