Senior Platform Infrastructure Engineer
About the job
- A shared belief in Mercari's mission and values.
- Senior-level engineering experience operating distributed systems in production at scale.
- Deep understanding of Kubernetes internals, including the scheduler, controllers, kubelet, admission webhooks, autoscaler, network policy, and workload identity, plus production ownership of a managed Kubernetes environment such as GKE, EKS, or AKS, including cluster upgrades, incident debugging, and add-on management.
- Deep Terraform experience at scale, including authoring custom modules, running blast-radius-aware migrations, and refactoring shared infrastructure-as-code without breaking downstream consumers.
- Strong system design and distributed systems fundamentals, including consistency, replication, capacity planning, and failure modes.
- A track record of owning an infrastructure domain end-to-end, including design, build, on-call, and incident follow-through.
- Professional working proficiency in English.
- Co-own the GKE cluster lifecycle, including upgrades, node-pool strategy, add-on management, capacity planning, and incident response.
- Own and evolve Terraform infrastructure-as-code, including custom modules, large-blast-radius migrations, and Terraform CI/CD processes for drift detection, staged rollout, revert planning, and pipeline reliability.
- Build and maintain reusable Terraform modules and self-service tooling that let product teams provision repositories with CODEOWNERS, PagerDuty, GitHub Actions workflows, and deployment pipelines without infrastructure hand-holding.
- Own autoscaling and capacity at scale, including Cluster Autoscaler, HPA, VPA, cost-aware right-sizing, and multi-region and node-pool strategies for large workloads.
- Ship internal developer-platform components in Go, including Kubernetes controllers, command-line interfaces, internal APIs, and AI agent skills.
- Join the Platform on-call rotation after ramp-up, lead root-cause analysis, and follow through with improvements.
- Drive reliability, security, and developer-experience initiatives in partnership with FinOps, Network, Observability, DBRE, and Enablement teams.
- Go for building Kubernetes controllers, command-line interfaces, and internal APIs.
- Networking fundamentals, including TCP/IP, Kubernetes networking (CNI, Services, ingress, and network policy), DNS, HTTP/2, and mTLS, sufficient to reason about incidents crossing the network boundary.
- CI/CD platform experience with GitHub Actions, Jenkins, or similar tools, including authoring workflows, custom actions, and self-hosted runners.
- Autoscaling and capacity-planning depth, including HPA, VPA, and Cluster Autoscaler internals, cost-aware autoscaling, and right-sizing.
- Experience building internal developer platforms, including self-service tooling, golden paths, and command-line interface or API ergonomics.
- Multi-region or multi-cluster operational experience.
- Exposure to Elasticsearch or other search infrastructure for cross-team collaboration.
- FinOps sensibility, including understanding cloud-spend drivers and how infrastructure choices affect costs.
About the company
Mercari runs a mobile peer-to-peer marketplace that lets people buy and sell secondhand goods across categories like fashion and electronics. Sellers list items by taking photos in the app, buyers browse and complete purchases, with payments held in escrow and integrated shipping options to secure transactions. It earns revenue from selling fees in different regions (about 10%), plus services like Merpay and promoted listings, and differentiates itself with a simple mobile experience, buyer protection, escrow, and business-enabled Mercari Shops. Its goal is to promote sustainable consumption by extending the life of goods and supporting a circular economy through a large global community.
Company Size
1,001-5,000
Company Stage
IPO
Headquarters
Tokyo, Japan
Founded
2013
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Simplify's Take
What believers are saying
- FY2026 revenue reached ¥229.29 billion, up 19%, with record core profit.
- Mercari US GMV hit $810 million, and active users returned to growth.
- September 2026 GENIAC selection funds AI robotics for listing and inspection automation.
What critics are saying
- The 2024 U.S. fee backlash proved Mercari can still alienate buyers overnight.
- eBay, Poshmark, Depop, and Vinted pressure Mercari in fashion and collectibles.
- Slow buyer growth in the U.S. can cap Mercari's turnaround before 2027.
What makes Mercari unique
- Mercari Japan's 4 billion listings create unmatched Japanese resale selection.
- Mercari controls inspection, shipping, translation, and payment for cross-border purchases.
- Mercari combines consumer P2P listings with professional MDepartment luxury recommerce.
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Benefits
Remote Work Options
Flexible Work Hours
Health Insurance
Parental Leave
Wellness Program
Growth & Insights and Company News
6 month growth
0%1 year growth
0%2 year growth
2%Japan METI's cicrular Economy Action Week begins today. From today until 7 October, METI is running its "Circular Economy (CE) Action Week," timed to coincide with the annual 3R (Reduce, Reuse, Recycle) Promotion Month that government ministries hold every October. Rather than another top-down advocacy for recycling or policy announcement, the campaign is asking consumers to adopt a circular habit of buying, using, separating and, eventually, circulating. Ten companies are helping consumers to visualise how the habits look like in their own way. Fashion rental service airCloset is discounting its first month's subscription by up to 30%, while furniture rental platform CLAS is cutting monthly fees on its CIRCLE range by as much as half. Suntory is publishing videos and quizzes on its bottle-to-bottle horizontal recycling, and Seven-Eleven Japan is pointing customers back to its in-store PET bottle collection machines, which have now taken in a cumulative 800 million bottles, rewarding five bottles with one nanaco point. Panasonic is launching a subscription water purifier that does away with disposable bottles altogether, Bandai Spirits is showcasing its Gunpla plastic model recycling scheme, Lion is collecting used toothbrushes for reprocessing, and Kao is using social media to explain its own resource loops. Reform Studio is hosting hands-on repair and remake sessions at AEON Mall Urawa Misono from 2 to 4 October. There will also be a physical event, to be held at MARK IS Minatomirai, where a Pac-Man tie-in event on 3 and 4 October turns waste sorting into a ticket to arcade play. Mercari, meanwhile, is reaching both ends of the generational spectrum, offering a week-long social media giveaway, while their Mercari Kids Flea Market events in Tokyo on 17 October and Osaka on 25 October let children try buying and selling first-hand. In additional to the campaign, METI also unveiled a "CE Action" logo to mark its launch. Any member of its Circular Partners (CPs) network, a roughly 600-strong public-private partnership, can now use on their own materials.
How to crosslist from Mercari to Poshmark: A reseller's guide. Published 2026-09-18 If you already sell on Mercari, bringing your active catalogue over to Poshmark is one of the most effective ways to increase sales. Poshmark operates as a social commerce platform with a large buyer base for fashion and lifestyle items, while Mercari functions as a straightforward resale app. Learning how to crosslist your items between both marketplaces lets you reach two distinct audiences without spending hours retyping every listing by hand. Understanding the differences: Mercari vs Poshmark. Mercari and Poshmark attract different buyer demographics and use distinct listing structures. Mercari caters to search-driven shoppers looking for clothing, electronics, home goods, and collectibles. Poshmark leans heavily into social commerce, where community sharing, brand followings, and curated party feeds drive secondhand fashion discovery. When you crosslist items between channels, you must account for each platform's listing requirements. Poshmark relies on structured brand mapping profiles and specific sizing conventions, whereas Mercari offers a simpler listing structure. Adapting your inventory to fit each platform ensures your items rank well in search results and convert into sales. Key capabilities for crosslisting success. Manually copying titles, descriptions, prices, and photos between platforms takes significant time. Modern crosslisting workflows streamline this process by automating how inventory details transition between marketplaces. * Dynamic size mapper: Translates footwear and apparel sizes into the correct target marketplace taxonomy. * Brand mapping profiles: Aligns listing details with approved platform brand directories. * Real-time sold delisting: Detects sales across connected channels to remove sold items automatically and prevent double sales. * Single-click crossposting: Sends prepared drafts straight to your target marketplace accounts. Setting up your desktop listing environment. To run your crosslisting workflow efficiently, you need a desktop or laptop computer running Google Chrome. Listing automation relies on browser extensions to communicate with your signed-in seller accounts, which mobile web browsers cannot support. While web dashboards let you review inventory on a phone, photographing, drafting, and crosslisting items requires a desktop browser setup. Make sure you remain signed in to your marketplace seller accounts in Chrome. Swiftlisted is building dedicated integration lanes for Mercari and Poshmark on its roadmap. Once these lanes ship, you will be able to crosslist, translate categories, and synchronise sold items seamlessly across both platforms alongside currently supported channels. Best practices for managing multi-channel inventory. Maintaining an organised central stockroom is essential when selling across multiple channels. Keep track of item states - whether an item is a draft, live, or sold - so you always know where your stock is listed. During photography, always capture clear, well-lit shots of size tags and brand labels. Clear photos help automated vision tools draft titles, descriptions, and categories accurately, making your review process fast and straightforward before hitting post. Common questions. * Can I crosslist from Mercari to Poshmark on a mobile phone? - No. Crosslisting automation requires a desktop or laptop computer running Google Chrome with the extension installed. Mobile browsers do not support extension automation, though you can view your stockroom dashboard on mobile. * Do I need existing seller accounts on both marketplaces? - Yes. Swiftlisted posts directly to your existing store accounts on connected marketplaces - it does not create new marketplace accounts for you. * How does sold detection prevent double sales? - When an item sells on one connected platform, background sold detection detects the purchase, updates your central inventory record, and delists the sold item across your other channels. * What do I need to start crosslisting with Swiftlisted? - You need a desktop or laptop running Google Chrome, the Swiftlisted Chrome extension, item photos, and active seller accounts on the marketplaces you sell on. List once, sell everywhere. Swiftlisted photographs, describes and crosslists your stock across every marketplace you sell on - then delists it everywhere when it sells.
Mercari Selected for GENIAC robotics foundation model R&D project, implemented by METI and NEDO. Kicking off research on automating item inspection and listing to support the expansion of crossborder transactions. Mercari, Inc. ("Mercari") is pleased to announce that its research project "Research and Development on Leveraging AI Robots for Listing and Inspection Tasks" has been selected for the Generative AI Accelerator Challenge (GENIAC), a national initiative spearheaded by the Ministry of Economy, Trade and Industry (METI) and the New Energy and Industrial Technology Development Organization (NEDO). The aim of the national initiative is to strengthen the development capabilities and social implementation of generative AI in Japan. Mercari is in the midst of driving its transformation into an "AI-Native Company," focusing on rebuilding all of its organizations, development processes, and products around AI technologies. For this project, Mercari's R&D organization R4D will conduct research and development on physical AI to automate Mercari's inspection and listing tasks. R4D will use Mercari's inspection and shipping facility, which handles a wide variety of items, as a real-world testing environment. Researchers will work on three key initiatives: building on Vision-Language-Action (VLA) models[1] to create multimodal models that integrate touch and force sensing; developing camera-aware VLA models that can handle viewpoint changes; and building a data collection framework that captures and transfers the actual sensations of human work. Using this technology, researchers will strive to optimize logistics efficiency in Mercari's crossborder transactions. This is the second time this year that a Mercari project has been selected for GENIAC. The first project, announced in June, was titled "Development of a High-Precision Search and Recommendation Platform Model for the Secondary-Distribution Market Using Generative Retrieval Technology."[2] 1. AI model that interprets visual input captured from a camera and natural language commands given by a human to generate the actions of a robot in a physical space. 2. Mercari Selected for GENIAC - Generative AI Accelerator Challenge Led by METI and NEDO (https://about.mercari.com/en/press/news/articles/20260604_geniac/) The challenges of automating the inspection tasks supporting the expansion of crossborder transactions and of working with current physical AI models. In September 2025, Mercari launched the Mercari Global App, a worldwide app that allows buyers overseas to more easily, safely, and securely buy from Mercari users in Japan. The app is currently available in Taiwan, Hong Kong, and the US, with Mercari working to expand its reach by aiming to launch the same product to over 100 additional countries and territories over the mid to long term. One of the critical pieces of infrastructure behind this crossborder growth is Mercari's inspection and shipping facility. To facilitate safe and secure transactions, Japan-sourced items purchased by users overseas are collected at Mercari's facility, where they undergo inspection before they are shipped overseas. Because Mercari's crossborder transactions deal with items across various categories, items vary widely in shape and condition. Inspection also involves handling deformable items such as fabrics and bags, and manipulating components like buttons and zippers. These are tasks that are difficult to automate with conventional model-based robot control alone. In recent years, VLA models - which generate actions directly from vision and language input - have emerged and are expected to be useful in environments like these. However, in adopting current VLA models for use in item inspection and other such tasks, the following three major pain points arise: * The robot's behavior relies solely on visual information input through cameras, and it cannot gauge the appropriate amount of force to apply to an item based on its feel and response * If the camera angle during inference differs even slightly from the images the model was trained on, the trained robot becomes unable to perform the appropriate operations * Data collection through robot teleoperation is inefficient In this project, Mercari's inspection and shipping facility - which handles a wide variety of irregular items - will serve as a real-world testing environment for technical innovations aimed at overcoming these limitations of VLA models. The success of this project will do more than just further accelerate the rapidly expanding growth of Mercari's crossborder business. It aims to contribute to the establishment of physical AI infrastructure that can be applied to the physical tasks of various industries. About GENIAC. The Generative AI Accelerator Challenge (GENIAC) is a project spearheaded by METI and NEDO with the aim of strengthening the development capabilities and social implementation of generative AI in Japan. * GENIAC website: https://geniac.meti.go.jp/ * Selection announcement webpage (available only in Japanese): https://www.nedo.go.jp/koubo/CD3_100434.html For more details on this research, see the accompanying article on the R4D website. https://r4d.mercari.com/en/news/20260909_geniac_pjysicalai_details/ Mercari will continue to connect communities across industry, academia, and government, contributing to the development of cutting-edge technology and social implementation while pioneering the path toward undiscovered value.
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