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Senior Search Platform Infrastructure Engineer

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本ポジションは日本語JDの用意がありません。

　
Senior Search Platform Infrastructure Engineer

Employment Status:　Full-time
Work Hours: Full Flextime (no core time)
Office: Roppongi

For more details, see the Overview of Our Positions section on our Careers site.　

About Mercari

Circulate all forms of value to unleash the potential in all people

"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

　
Organization/Team Mission

Mercari Engineering Principles

Mercari 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.

These principles ultimately help us achieve Mercari’s mission by defining the ideal state we seek to realize in the long term.

Passion For The Product
Grow Together
Solve Through Mechanisms
Collaborate Openly

For more details, please see the following link:

Engineering Culture

The 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.

The Search Infrastructure team - part of the Autonomous Cloud division - runs Mercari's search platform as a managed service for engineering teams across the company. We operate large-scale, product-critical Elasticsearch clusters and supporting systems (Redis, vector databases) that power product search across Mercari's marketplace. Our job is to abstract away the operational complexity of search so product teams can focus on building features. We are a small, deep team that combines hands-on operation of search clusters with in-house expertise on search-engine technology - partnering closely with internal Search and product teams.

See here for more information about our mission and values.

　
Work Responsibilities

Co-own the Elasticsearch cluster lifecycle: provisioning, sizing, upgrades, shard / replica strategy, and index management for product-critical search workloads.
Join the search infrastructure on-call rotation after ramp-up; lead incident response, root-cause analysis, and follow-through improvements.
Drive performance and reliability initiatives across the cluster, JVM, and query layers. Improve the search APIs and aggregation services consumed by product teams.
As bandwidth allows, collaborate with the Platform Infrastructure team on high-impact Kubernetes and Terraform changes as a senior reviewer and engineer; mentor engineers across both teams.

Unique Challenges

Operating a search platform that serves product-critical workloads at very large scale (hundreds of millions of indexed items at sustained high query volume) with demanding availability and latency expectations.
Owning the full search infrastructure stack end-to-end - from cluster operations and JVM tuning down to query-path performance - across a small, deep team where each engineer has real platform-level ownership.
Balancing day-to-day reliability of running clusters with longer-horizon investments: version upgrades, automation, and evaluating next-generation search and vector technologies.
Sitting at the boundary between infrastructure and product - translating between platform-level concerns (capacity, reliability, cost) and product-team needs (indexing patterns, query behavior, search experience).

　
Qualifications

Required Experience/Skills

Shared belief in Mercari's mission and values.
Senior-level engineering experience operating distributed systems in production at scale.
Strong system-design and distributed-systems fundamentals: consistency, replication, capacity planning, failure modes.
Production ownership of Elasticsearch (or a comparable Lucene-based search engine) - cluster sizing, JVM / heap tuning, query-performance debugging, shard strategy.
Track record of owning a technical domain end-to-end: design, build, on-call, incident follow-through, long-term roadmap. Proficiency in Go and/or Java.

Preferred Experience/Skills

Lucene internals or JVM performance-engineering depth.
Vector search knowledge.
Production experience operating Kubernetes (GKE, EKS, or AKS) - cluster upgrades, incident debugging.
Terraform at scale (custom modules, large-blast-radius migrations).
CI/CD platform experience (GitHub Actions, Jenkins, or similar).
Search / data services for C2C or e-commerce at scale.

Language

Japanese: Not required
English: Business level (CEFR – B2)

For details about CEFR, see here.

Learn More About Mercari Group

Careers site:
Mercan:
Social media: X / Linkedin

Recruiting at Mercari

At 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.

Recruiting cycle at Mercari Group

Application screening
Skill 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.)
Interview: The number of interviews may vary depending on the position.
Reference check: We will ask for online references around the timing of the final interview.
Offer: Offers will be determined carefully in consideration of the final interview and the reference check.

　Learn more about our recruiting process here.

　
Equal Opportunity Hiring

Here 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.

This, 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.

Please read and acknowledge our Privacy Policy prior to submitting your application.

Requirements

Benefits

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What this application asks

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First name, Last name, Email, Phone, Address, Resume, Other, Please indicate your gender (We process your gender for statistical reasons) / 性別をご選択ください。（メルカリでは上記の情報をダイバーシティー、インクルーシビティの促進のための統計目的で調査しております。）, Please read and agree to the Recruitment Privacy Policy of the Mercari Group by checking "YES". (https://careers.mercari.com/en/privacy/) / メルカリグループの採用活動におけるプライバシーポリシーをご確認の上、同意(YES)をお願いします。(https://careers.mercari.com/jp/privacy/), Do you have an employment history with Mercari Group? / 過去にメルカリグループでの勤務経験がありますか？, Have you ever directly or indirectly applyed to any positions of Mercari Group? / 過去にご自身またはエージェントを通じてメルカリグループに応募されたことはありますか？, How did you hear about this position? / この募集をどのように知りましたか？, If your application is a referral from an employee of Mercari Group, please the employee's name. If your application is not a referral, please enter NA. / 今回の応募がメルカリグループ社員による紹介の場合、社員名を記入下さい。該当しない場合はNAとご記入下さい。, Please select your current status of residence in Japan from the list below. We will confirm if you need visa support. / 現在お持ちの日本における在留資格を下記からお選びください。ビザサポートが必要になるか確認をさせていただきます。, Mercari's values serve as the foundation of our culture and guide all of our decisions. We encourage you to review them before submitting your application. (https://careers.mercari.com/culture/) メルカリのバリューは私たちの文化の柱であり、行動指針となります。あらかじめ応募前にご確認ください。 (https://careers.mercari.com/culture/), Select the language(s) in which you would feel comfortable interviewing? / 面接時の希望言語をお知らせください。, Please select the appropriate level about your English language ability from below. Please check each criteria from our web site. https://careers.mercari.com/language/ 英語スキルについて該当するものをご選択ください。レベルの基準は採用サイトよりご確認ください。 https://careers.mercari.com/jp/language/, Please select the appropriate level about your Japanese language ability from below. Please check each criteria from our web site. (https://careers.mercari.com/language/) 日本語スキルについて該当するものをご選択ください。レベルの基準は採用サイトよりご確認ください。 (https://careers.mercari.com/jp/language/), In consideration with ensuring an appropriate assignment and wellness after joining the company, please let us know if you have any medical history related to mental health. 入社後の適正配置及び健康確保の観点からの質問です。メンタルの不調に関連した既往歴がある場合はお知らせください。 YES=ある、NO=ない, If you have chosen "YES" in the previous question, please share your current status. Please choose NA if you have answered "NO" in the previous question. 上記設問で「ある」を選択された場合、通院状況についてお知らせください。上記で「ない」を選択された場合は該当なしを選択ください。, To ensure your well-being and that any necessary accommodations are prepared after joining the company, please let us know if you have any disabilities. 入社後の適正配置及び健康確保の観点より、障がいをお持ちの場合はお知らせください。 YES=ある、NO=ない, Please feel free to share if there is anything the company should know to help ensure you can perform at your best. そのほか、良いパフォーマンスをする上で会社が知っておくべきことがある場合はお知らせください。, Please enter your websites, social media accounts, GitHub, etc. If you do not have any, please enter N/A. お持ちのウェブサイト、ソーシャルメディア、GitHubアカウント等があればご記入ください。お持ちでない場合は「なし」とご記入ください。, This position requires relocation to Japan. Is this something you are open to? Candidates already located in Japan please select "yes". このポジションは日本への転居が必要です。日本への転居は可能ですか。すでに日本在住の方は "YES"を選択してください。

Could you share your experience operating Elasticsearch or similar Lucene-based search systems in production? What kinds of challenges have you faced and how did you address them? written answer
Can you describe your background working with distributed systems at scale? What types of systems have you managed, and what were some key learnings from those experiences? written answer
What is your proficiency level in English? choose one
Are you comfortable participating in an on-call rotation after you have ramped up in the role? yes / no