{"id":16168,"url":"https://alion.io/job/mercari-senior-platform-infrastructure-engineer-mercari","title":"Senior Platform Infrastructure Engineer - 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":"B","score":84,"open_postings":112,"ghost_share":0.179,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":83,"computed_at":"2026-10-20T05:45:00Z"}},"role":"DevOps","role_family":"DevOps","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","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":{"min_usd":36000,"max_usd":100000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":3299},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"cert-manager","optional":false},{"name":"CI/CD","optional":false},{"name":"FinOps","optional":false},{"name":"GitHub","optional":false},{"name":"GitHub Actions","optional":false},{"name":"Go","optional":false},{"name":"Google GKE","optional":false},{"name":"Kubernetes","optional":false},{"name":"PagerDuty","optional":false},{"name":"SLI/SLO/SLA","optional":false},{"name":"Terraform","optional":false},{"name":"Amazon EKS","optional":true},{"name":"AWS","optional":true},{"name":"Azure","optional":true},{"name":"Azure AKS","optional":true},{"name":"DNS","optional":true},{"name":"ElasticSearch","optional":true},{"name":"GCP","optional":true},{"name":"Jenkins","optional":true},{"name":"TCP/IP","optional":true}],"status":"live","first_seen_at":"2026-07-17T00:00:00Z","employer_posted_date":"2026-07-17","last_verified_at":"2026-10-20T11:00:32Z","board_verified":true,"closed_at":null,"days_open":95,"trust":{"level":"ok","repost_count":0,"flags":["company_stale"],"days_open":95},"description":"本ポジションは日本語JDの用意がありません。\nSenior Platform Infrastructure Engineer - Mercari\nEmployment Status: Full-time\nWork Hours: Full Flextime (no core time) \nOffice: Roppongi (hybrid) \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:\nEngineering Culture\nThe Autonomous Cloud group in the Platform Division builds and operates the foundational infrastructure that lets every engineering team at Mercari ship products safely and quickly - covering the Kubernetes platform, search infrastructure, observability, networking, and FinOps. Our charter is to make complex infrastructure simple to consume, so product teams can spend their time on customer value rather than on running systems.\nThe Platform Infrastructure team - part of the Autonomous Cloud division - runs Mercari's Kubernetes platform and Infrastructure-as-Code as a managed service for engineering teams across the company. We operate the GKE clusters that host most of Mercari's microservices, own the Terraform code that provisions and evolve them, and build the developer-facing \"kits\" that let hundreds of engineers spin up new microservices and on-call setup in minutes rather than days. Our job is to abstract away the operational complexity of the platform so product teams can focus on building features. We are a team that combines hands-on operation of the clusters with deep expertise in Kubernetes internals and IaC-at-scale - partnering closely with Search Infra, Network, Observability, FinOps, DBRE, and Enablement teams.\nSee here for more information about our mission and values.\nWork Responsibilities\nCo-own the GKE cluster lifecycle: upgrades, node-pool strategy, add-on management (Cert Manager, autoscaling, workload identity), capacity planning, and incident response.\nOwn and evolve the Terraform IaC: custom modules, large-blast-radius migrations, and the Terraform CI/CD that keeps changes safe at scale - drift detection, staged rollout, revert planning, and pipeline reliability.\nBuild and maintain \"kits\" - reusable Terraform modules and self-service tooling that let product teams provision repos (with CODEOWNERS), PagerDuty, GitHub Actions workflows, and deployment pipelines without infra hand-holding.\nOwn autoscaling and capacity at scale: Cluster Autoscaler / HPA / VPA, cost-aware right-sizing, and multi-region and node-pool strategies for large workloads.\nShip internal developer-platform components in Go: k8s controllers, CLIs and internal APIs, and AI agent skills that cut friction on the most-used developer paths.\nJoin the Platform on-call rotation after ramp-up; lead root-cause analysis and follow-through improvements.\nDrive reliability, security, and developer-experience initiatives in partnership with FinOps, Network, Observability, DBRE, and Enablement teams.\nUnique Challenges\nKubernetes at multi-tenant scale - We run GKE clusters that host hundreds of microservices deployed by teams across the company. Node-pool strategy (autoscaling, spot, ARM diversification), control-plane and add-on upgrade cadence, and workload isolation are everyday work. Every change to a shared Terraform module, a GKE add-on, or a kit touches all of those services at once, so getting the design and the rollout right up-front is a core part of the job. \nCustom controllers, admission policy, and add-on ownership - A meaningful part of the platform is our own Kubernetes controllers, admission webhooks, and policy layer (RBAC, network policies, OPA / Gatekeeper) that keep a multi-tenant cluster safe and predictable. You design and run these, not just consume upstream. \nMulti-region and multi-architecture roadmap - We are actively expanding to a multi-region topology and adopting different k8s node-types for cost and capacity headroom. You will help shape this rollout.\nDeveloper-experience as an SLI - The self-service kits are used every day by product engineers. A regression in a kit shows up as friction across the whole engineering org, so we take DX seriously as a reliability signal, not a nice-to-have.\nCross-team ownership - Platform Infra sits between application teams, cloud providers, and peer infra teams (Search, Network, Observability, FinOps, DBRE, Enablement). Success in this role requires investing substantial time in cross-team architecture, shared platform capabilities, and organizational alignment not just work within your own team.\nQualifications\nRequired Experience/Skills\nShared belief in Mercari's mission and values.\nSenior-level engineering experience operating distributed systems in production at scale.\nDeep understanding of Kubernetes internals - scheduler, controllers, kubelet, admission webhooks, autoscaler, network policy, workload identity - and production ownership of a managed Kubernetes environment (GKE, EKS, or AKS): cluster upgrades, incident debugging, add-on management.\nDeep Terraform experience at scale - authoring custom modules, running blast-radius-aware migrations, refactoring shared IaC without breaking downstream consumers.\nStrong system design and distributed systems fundamentals: consistency, replication, capacity planning, failure modes.\nTrack record of owning an infrastructure domain end-to-end: design, build, on-call, incident follow-through.\nProfessional working proficiency in English.\nPreferred Experience/Skills\nGo for building k8s controllers, CLIs, and internal APIs.\nNetworking fundamentals - TCP/IP, Kubernetes networking (CNI, Services, ingress, network policy), DNS, HTTP/2, mTLS - enough to reason about incidents that cross the network boundary.\nCI/CD platform experience (GitHub Actions, Jenkins, or similar) - authoring workflows, custom actions, self-hosted runners.\nAutoscaling / capacity-planning depth: HPA / VPA / Cluster Autoscaler internals, cost-aware autoscaling, right-sizing.\nExperience building internal developer platforms - self-service tooling, golden paths, CLI / API ergonomics.\nMulti-region or multi-cluster operational experience.\nExposure to Elasticsearch or other search infrastructure (helpful for cross-team collaboration, not required).\nFinOps sensibility - understanding cloud spend drivers and how infra choices show up on the bill.\nLanguage \nJapanese: Not required\nEnglish: Business level (CEFR B2)\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 \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. For more details, please read our I&D statement.\nPlease read and acknowledge our Privacy Policy prior to submitting your application.","description_format":"text","description_chars":9448,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"Upper-Intermediate (B2)","optional":false},{"language":"Japanese","level":"Advanced (C1)","optional":false}]},"benefits":[],"hiring_locations":[{"name":"Japan","iso":"JP","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Marketplaces","Secondhand"],"lifecycle":[{"event":"open","at":"2026-07-17T00:00:00Z"}],"visa":[],"liveness":{"score":34,"band":"fade","label":"Fading","p_open":1,"p_active":0.778,"p_room":0.44,"age_days":95,"expected_fill_days":83,"reasons":["conf:3","velocity","win:tail","crowd:brand"],"computed_at":"2026-10-20T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/mercari-senior-platform-infrastructure-engineer-mercari","json_url":"https://alion.io/job/mercari-senior-platform-infrastructure-engineer-mercari.json","meta":{"generated_at":"2026-10-20T12:45:16Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":14090,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-21T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":914},"rest":"https://alion.io/mcp/rest/get_company?id=914"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fmercari-senior-platform-infrastructure-engineer-mercari"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fmercari-senior-platform-infrastructure-engineer-mercari"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fmercari-senior-platform-infrastructure-engineer-mercari"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/mercari-senior-platform-infrastructure-engineer-mercari\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fmercari-senior-platform-infrastructure-engineer-mercari"}]}