{"id":16190,"url":"https://alion.io/job/mercari-database-reliability-engineer-dbre-mercari","title":"Database Reliability Engineer (DBRE) - 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":"2026-10-16T05:45:00Z"}},"role":"Data Science","role_family":"Data Science","seniority":null,"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":"Amazon Aurora","optional":false},{"name":"Ansible","optional":false},{"name":"Apache Kafka","optional":false},{"name":"AWS","optional":false},{"name":"Datadog","optional":false},{"name":"GCP","optional":false},{"name":"Google Cloud Spanner","optional":false},{"name":"Grafana","optional":false},{"name":"MySQL","optional":false},{"name":"Node JS","optional":false},{"name":"Perl","optional":false},{"name":"PHP","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Python","optional":false},{"name":"Ruby","optional":false},{"name":"SLI/SLO/SLA","optional":false},{"name":"TCP/IP","optional":false},{"name":"Terraform","optional":false},{"name":"TiDB","optional":false},{"name":"CockroachDB","optional":true},{"name":"GitHub","optional":true},{"name":"JavaScript","optional":true},{"name":"Kubernetes","optional":true}],"status":"live","first_seen_at":"2026-05-14T00:00:00Z","employer_posted_date":"2026-05-14","last_verified_at":"2026-10-16T17:29:28Z","board_verified":true,"closed_at":null,"days_open":155,"trust":{"level":"ok","repost_count":1,"flags":["company_stale"],"days_open":155},"description":"JD in Japanese follows. 英文の後に和文JDをご覧いただけます。\nDatabase Reliability Engineer (DBRE)\n雇用形態： 正社員\n働き方： フレックスタイム制（コアタイムなし）*オンコール対応あり\n勤務地： 六本木\n詳細はキャリアサイトの募集要項 よりご確認ください\nDBREチームのブログをぜひご覧ください。\nTiDB\nDatabase\nメルカリグループについて\nあらゆる価値を循環させ、あらゆる人の可能性を広げる\n「地球資源が限られているなか、より豊かな社会をつくるために何ができるか」。2013年、創業者の山田進太郎が世界一周の旅で抱いた課題意識から、フリマアプリ「メルカリ」は生まれました。私たちは、物理的なモノやお金に限らずあらゆる価値を循環させることで、誰もがやりたいことを実現し、人や社会に貢献するための選択肢を増やすことができると信じています。\nテクノロジーの力で世界中の人々をつなぎ、あらゆる人の可能性が発揮される世界を実現していきます。メルカリグループの目指すべき方針については Mercari Culture Doc をご覧ください。\n組織・チームのミッション\n Mercari Engineering PrinciplesMercari Engineering Principles は、メルカリのエンジニアリング組織における信念や行動の基盤となる共通認識を明文化したもので、メルカリのメンバー全員が共有するMission、Value、Cultureをエンジニアリングの視点から補完するものとなります。これらのPrinciplesは、私たちが長期的に実現しようとする理想的な姿を定義することで、最終的にメルカリのミッションを達成するために活用していきます。\n\nPassion For The Product\nGrow Together\nSolve Through Mechanisms\nCollaborate Openly\n詳細については エンジニアリングカルチャー をご覧ください\n業務内容\nフリマアプリ「メルカリ」はサービス開始以来、成長を続け、現在では国内最大規模のマーケットプレイスとなりました。 サービスの成長に合わせ、トラフィックが増え続けるなかでもメルカリのお客さまに、より良い体験を提供するにはシステムの信頼性やパフォーマンス、スケーラビリティを改善し続けることが必要不可欠です。そこで現在、データベースに関わるポジションを募集しています。\nメルカリのDatabase Reliability Engineeringチームでは膨大なトラフィックを持つサービスを安定稼働させるためのソフトウェアの開発・運用を担うソフトウェアエンジニアを募集しています。具体的な業務は以下の通りです。\nシステムモニタリング、キャパシティプランニング\nパフォーマンス、スケーラビリティの改善\n障害検知、障害対応\nCloudSQL(MySQL, PostgreSQL) AlloyDB, TiDB, Spanner や各種ミドルウェアの運用/性能チューニング\nオペレーションの自動化を実現させるためのソフトウェア開発\nデータベースの利用/運用に関するガイダンスの策定\nユニークなチャレンジ\n我々は、数十テラバイトのデータを保有し、数十万QPSを処理する大規模で重要なDatabaseクラスタを運用しています。Google Cloud SpannerやGoogle Cloud SQLや TiDB Cloudなども大規模に利用しており、マネージドサービスの最適な利用を推進する役割も担っています。この様な、多様、大規模、ミッションクリティカルな環境下で、安定性を維持する事は勿論のこと、将来的なサービスの成長にも対応できる環境の提供に取り組んでいます。\n必須条件\nメルカリグループおよび各カンパニーのミッションとバリューに共感していただける方\nデータベースの運用経験、最適なパフォーマンスチューニングの経験\nSQLの知識、テーブル設計、データの保守・運用経験\nTCP/IP、HTTPなどのネットワークプロトコルについての基礎知識\nGo、PHP、Perl、Python、Ruby、Node.js のうちいずれかを利用したソフトウェアの開発・運用経験\nシステムのパフォーマンスや信頼性を向上させるのに必要なアプリケーション、ミドルウェアへの機能追加、バグ修正を行うためのプログラミング能力\nシステムの技術的問題（例：パフォーマンス低下）の原因を発見、解決するための能力\nSLI/SLO 設計をはじめとしたSREプラクティスの知識\n歓迎条件\nGCP、AWS等のクラウドプラットフォームの利用経験\nオンプレミス環境の運用経験\nAnsibleやTerraform等のオーケストレーションツールの利用経験\nCloud SpannerやAmazon Aurora等のDBaaSの利用経験\nDockerやKubernetesの利用経験\nマイクロサービスの開発運用経験\nDatadog の高度な利用経験\nnginxやmemcached等のミドルウェア、MySQL等のRDBMSの運用経験\n大規模Webサービスの開発、運用経験\n分散コンピューティングに関する知識\n選考のポイント\n業務に必要な技術的知識を持っていること\n複雑な状況下で課題解決のための道筋を立てられること\nチームのために、率先して成功のために行動できること\n※詳しくは こちら のページをご覧ください。\n語学力\n日本語： Proficient (CEFR - C2) 必須\n英語：Independent (CEFR - B2) 歓迎\n※CEFRの詳細については、こちら をご覧ください\nメルカリグループについて知る\nキャリアサイト https://careers.mercari.com/ \nメルカン：https://mercan.mercari.com/ \nSNS：X / Linkedin \n関連記事\nTiDB Cloudにおけるオートスケールの実現\n大規模データ更新・削除を“安全に分割実行”するための汎用ツール\nTiDB の DM 利用中に安全に DDL を実行する\nTiDBのmodify columnの大規模DDL実行\nTTLを利用したTiDBの効率的なインスタンス活用\n選考について\nメルカリグループではメルカリグループおよび各カンパニーのミッションとバリューへの共感・体現を大切にしています。メンバーが発揮する価値の総量が最大化されるような組織づくりを推進するために、候補者のみなさんの経験やスキルをより正しく理解したいと考えています。\n選考の流れ\n書類選考\n技術課題：エンジニアポジションではHackerRankまたはGithubでの技術課題を、エンジニア以外のポジションでは採用ポジションによります（面接タイミングと前後することがあります）\n面接：ポジションにより、複数回の面接をお願いします\nリファレンス：オンライン回答形式のもので、最終選考の前後でお願いします\nオファー：最終選考とリファレンスの内容より決定されます\n※詳しくは こちら のページをご覧ください\n選考における機会の平等\nメルカリでは、バックグラウンドによって個人の可能性が決めつけられることなく、自由に価値を生みだす機会を手にできる社会の実現を目指しています。そしてメルカリがミッションを実現するために「Inclusion & Diversity」という考え方は不可欠な存在だと考えています。\n採用活動においても、メルカリのミッション・バリューに共感する、様々なバックグラウンドの方にジョインしていただけるよう、年齢、性別、性的指向、人種、宗教、身体能力、その他記号に基づくあらゆる差別をなくすことを約束します。\n詳しくは、I&D statement をご覧ください。\nなお、ご応募の際には プライバシーポリシー をご確認ください。\nDatabase Reliability Engineer (DBRE) - Mercari\nEmployment Status: Full-time\nWork Hours: Full Flextime (no core time) *on-call\nOffice: Roppongi\nFor more details, see theOverview of Our Positions section on our Careers site.\nFeel free to have a look at our DBRE team blogs:\nTiDB\nDatabase\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. These 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\nIn the DBRE Team, we own the reliability, scalability, and cost efficiency of Mercari's production databases. Our core platform today is TiDB Cloud, serving items, transactions, and user data at hundreds of thousands of QPS under a 99.99% availability SLA. Over the next 12-18 months, we are expanding our scope to a multi-engine DBRE - adding AlloyDB, CloudSQL (PostgreSQL/MySQL), and eventually Spanner - while driving cost optimization, automation, and tighter integration with product and platform teams.\nSee here for more information about our mission and values.\nWork Responsibilities\nOperate production databases (TiDB, MySQL, PostgreSQL, and managed cloud DBs) under a 99.99% availability SLA, including on-support rotation for urgent issues.\nLead end-to-end epics independently - from design through rollout, monitoring, and post-launch tuning.\nDesign and execute database migrations (engine changes, version upgrades, on-prem to cloud cut-overs) with zero or minimal downtime.\nBuild and operate CDC and streaming pipelines (Debezium, TiCDC, Kafka) feeding analytics and downstream services.\nWrite Infrastructure-as-Code (Terraform, Ansible) and automation in Go or Python to reduce toil and scale operations.\nBuild and maintain database monitoring, alerting, and SLO/SLI dashboards (Datadog, Grafana).\nDiagnose and resolve production incidents, lead post-mortems, and drive permanent fixes.\nPerform performance tuning on production workloads (query plans, schema, indexing, replication topology).\nPartner with product and platform teams on schema changes, capacity planning, and new database adoption.\nContribute to the team's expansion into multi-engine DBRE by learning and productionizing new database engines (AlloyDB, Spanner, and others).\nUnique Challenges\nOperating TiDB at Mercari scale (hundreds of thousands of QPS, multi-TB datasets) with a 99.99% SLA.\nExpanding the team's operational scope from a TiDB-centric model to a multi-engine portfolio (AlloyDB, CloudSQL, Spanner) - you will help define the operational model as we go.\nBalancing ~40-50% reactive work (alerts, on-support tickets, DDL operations, incident response) with project delivery.\nDriving cost optimization on a growing database bill without compromising reliability.\nWorking in a bilingual environment: daily team syncs are primarily in Japanese; cross-team collaboration is in English.\nQualifications\nRequired Experience/Skills\nProduction DBA or DBRE experience with MySQL, TiDB, PostgreSQL, or an equivalent RDBMS, including an understanding of internals (replication, indexing, query planning).\nExperience operating databases at scale (>10K QPS or >1TB datasets) under production SLAs.\nProduction experience with GCP or AWS managed database services (CloudSQL, AlloyDB, RDS, Aurora, or equivalent).\nInfrastructure-as-Code experience (Terraform, Ansible) and scripting in Go, Python, or shell.\nHands-on experience with database monitoring and observability (Datadog, Grafana, or equivalent).\nExperience owning incident response, performance tuning, and on-call or on-support rotations.\nAbility to lead epics end-to-end without teammate support.\nWillingness to learn new database engines (AlloyDB, Spanner, PostgreSQL) beyond your core expertise.\nPreferred Experience/Skills\nExperience with distributed database internals (sharding, replication, consensus) or operating TiDB, Spanner, Vitess, or CockroachDB in production.\nCDC / streaming pipeline experience (Debezium, TiCDC, Kafka Connect, or similar).\nKubernetes operational experience.\nExperience leading major database migrations (engine, version, or data center).\nExperience driving cross-team coordination for schema changes, migrations, or platform adoption.\nLanguage\nJapanese: Proficient (CEFR - C2) required\nEnglish: Independent (CEFR - B2) preferred \nFor details about CEFR, seehere.\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 processhere.\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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