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Mercari

Software Engineer Internship - Class of 2028

Class of 2028, 28卒察象 / Software Engineer Internship - Mercari Group

Tags: Internship, Business Japanese, Remote

Minato City, Tokyo, Japan / Remote (Remote)・Fetched Today

Job Description

Employment Type: Temporary
Team: Engineering

JD in Japanese follows. 英文の埌に和文JDをご芧いただけたす。

Class of 2028, 28卒察象 / Software Engineer Internship - Mercari Group

Mercari is far from a "finished product." It is precisely because we are a work in progress that there is so much room for transformation. We are looking for future leaders—those who will start on the front lines, eventually shape our strategy, and drive both our product and organization forward. Come build the future of Mercari with us.

Target Applicants

  • Target Applicants: Those who can join as new graduates in October 2027 or April 2028.
  • Employment Status: Intern - Please apply only if you are able to stay in Japan, as the internship must be from within Japan. For those who live overseas, we will provide Visa support and accommodation arrangements.
  • Work Hours: Able to work more than 20 hours per week. A 2-3 months of Internship is encouraged. Please consult with the recruiter if you prefer shorter/longer period
    • Airline ticket arrangements will be provided only to candidates who have not yet purchased their tickets at the time the internship offer is made.
  • Office: in Japan (Remote or Roppongi)
  • Application Deadline: June 15, 2026, 23:59 (JST)

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

This internship offers the opportunity to work on experience design from a management perspective—not just engineering—and to grow into a leader who will drive the future of the Mercari Group. For students aspiring to become product leaders, it provides the chance to take on challenges that contribute to both business growth and solving social issues.

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

Work Responsibilities

  • You will be challenged with developing features for the flea market app "Mercari," the smartphone payment service "Merpay," and the cryptocurrency/blockchain service "Mercoin" within Japan. You will join a team of software engineers with diverse backgrounds and expertise and take on responsibilities as a team member.
  • Regarding specific tasks, you will be involved in projects aimed at improving the user experience (UX) and specifications from the customer's perspective for Mercari, Merpay, and Mercoin. Currently, Mercari is implementing various initiatives, such as improving the search interface and measures related to listing and purchasing. You will engage with the technology and data firsthand and produce tangible outputs.
  • Ultimately, you will present your work and actual results at a final report meeting.


Unique Challenges 

  • During this internship, you will work to develop actual features integrated into the app and to improve the operation of the app. We hope that, by working in the same environment as our full-time members, interns will not only acquire new skills and immerse themselves in the company culture but also use the internship as an opportunity for self-reflection.
  • At Mercari Group, you will be able to take on bold challenges without any fear of failure. What’s more, you will be able to flexibly choose the latest and optimal technologies, and because we foster an environment and culture that supports independent decision-making, the experience will offer an opportunity for both personal and professional growth. 


Qualifications 

  • Those who are interested in management and building an engineering organization and culture as a leader candidate (CTO, VPoE, etc.) who will lead the Mercari Group organization in the future.
  • Those who can express what they want to do through their output and co-create with teams and organizations.
  • Those who enjoy change and can boldly take on challenges even in unfamiliar areas or difficult situations.
  • Shared belief in the mission and values of Mercari Group and its various companies
  • Students aged 16 or older who are expected to join the Mercari Group as new graduates between July 2027 and June 2028.
    • If you have work experience as a full-time employee at another company and that experience is within the last three years, you can participate as a second new graduate. Second new graduates should include their work history in their resume.
  • Interest in joining the Mercari Group as a software engineer after completing the internship
  • Possessing one of the following 5 "BOLD" characteristics:
    1. Visionary mindset with a strong drive to execute: Those who can continue to challenge transformation against fundamental issues.
    2. Ability to inspire and mobilize others: Those who can attract others and form teams themselves.
    3. Insatiable intellectual curiosity: Those who can learn and continue to evolve on their own.
    4. Grit regardless of the environment: Those who can get their hands dirty and commit to results even in adversity.
    5. Co-creation with AI: Those who can maximize output using technology as a weapon.

Required Experience / Skills

  • (For residents in Japan only) Those who have experience using various Mercari services
  • Experience in delivering results through projects utilizing the latest AI technologies and tools
  • Basic knowledge of RDBMS and SQL
  • Experience developing/operating products
  • Practical or research-level development experience in at least one of the following:
    • Backend: API development experience using languages such as Go, PHP, or Java.
    • Frontend: Development experience using JavaScript, React, etc.
    • Mobile (iOS or Android): Development experience using Swift or Kotlin.
    • Machine Learning: Practical experience in ML modeling or development experience in ML systems.
    • Platform Engineering: Development experience using Go and Kubernetes.
    • Site Reliability Engineering: Development experience using Go, Kubernetes, and Terraform.
    • Data Engineer: Experience in data aggregation, analysis, or visualization using Python, SQL, etc.
    • Security Engineer: Development experience using programming languages such as Go, Python, PHP, or JavaScript.

Preferred Experience / Skills

  • An interest in leading businesses and organizations, with a desire for a future management career.
  • Experience producing tangible results in a business setting, such as through internships or entrepreneurship.
  • Experience with project management and/or team leadership
  • Ability to design and develop with performance and scalability in mind
  • Knowledge of object-oriented software development, networking, and memory management.
  • Knowledge in software test including unit testing, functional testing, and e2e testing
  • Knowledge of and experience with networks, Linux servers, surveillance systems, logging, and system operation
  • Experience with development and operation in a microservices architecture
  • Cloud development experience (preferably Google Cloud or AWS)
  • Understanding of UI development
  • OSS contribution experience / familiarity with OSS community
  • Experience with team development using Git or similar management systems

Language

  • English or Japanese: Independent (CEFR - B2)
    • In Mercari, there are cases where Independent (CEFR - B2)-level English Independent is required
    • In Merpay, Mercoin there are cases where Independent (CEFR - B2)-level Japanese is required

For details about CEFR, see here.


Learn More About Mercari Group


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

It takes approximately 1.5 months from application to offer.

  1. Document Screening
  2. Technical Assessment
    • For engineering positions, you will be asked to complete a skill assessment on HackerRank or GitHub. (The timing may vary relative to the interviews.)
  3. Interviews (2 rounds)
    • The number of interviews may vary depending on the position.
    • For those who select "Mercari" as your internship company, there is a possibility of an English interview as there are teams that work in English.
  4. Offer
    • Determined based on the final interview and reference checks.
    • Learn more about our recruiting process here.

 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.

Class of 2028, 28卒察象 / Software Engineer Internship - Mercari Group

メルカリは「完成された䌚瀟」ではありたせん。未完成だからこそ、倉革の䜙地がありたす。 たずは珟堎で経隓を積み、やがおは戊略を描き、プロダクトず組織を牜匕する。そんな「メルカリの未来を創るリヌダヌ」を求めおいたす。

募集芁項抂芁

  • 募集察象2027幎10月、たたは2028幎4月に新卒ずしお入瀟可胜な方
  • 雇甚圢態むンタヌン
    • むンタヌンシップは囜内からの参加を必須ずしおおりたすので、日本に滞圚できる方のみご応募ください。
    • 海倖に圚䜏の方には、Visaのサポヌトや航空刞/宿泊先手配等行いたす。
      • 航空刞の手配に぀いおは、むンタヌンシップのオファヌ時に航空刞を賌入しおいない方に限りたす
  • 勀務日数週20時間以䞊の勀務が可胜な方 期間は玄2-3ヶ月を目安ずしおおりたすが、難しい堎合はご盞談ください
  • 勀務地日本リモヌト or 六本朚オフィス
  • 応募締切 2026幎6月15日 23:59たで


メルカリグルヌプに぀いお
あらゆる䟡倀を埪環させ、あらゆる人の可胜性を広げる

「地球資源が限られおいるなか、より豊かな瀟䌚を぀くるために䜕ができるか」。2013幎、創業者の山田進倪郎が䞖界䞀呚の旅で抱いた課題意識から、フリマアプリ「メルカリ」は生たれたした。私たちは、物理的なモノやお金に限らずあらゆる䟡倀を埪環させるこずで、誰もがやりたいこずを実珟し、人や瀟䌚に貢献するための遞択肢を増やすこずができるず信じおいたす。

テクノロゞヌの力で䞖界䞭の人々を぀なぎ、あらゆる人の可胜性が発揮される䞖界を実珟しおいきたす。メルカリグルヌプの目指すべき方針に぀いおは Mercari Culture Doc をご芧ください。


組織・チヌムのミッション

  • 単なる゚ンゞニア業務にずどたらず、経営芖点を意識した䜓隓蚭蚈に携わり、将来的にメルカリグルヌプを牜匕するリヌダヌ人材ずしお成長できる環境を提䟛したす。未来のプロダクトリヌダヌを目指す孊生にずっお、事業成長ず瀟䌚課題解決の䞡面から挑戊できるむンタヌンシップです。 

Mercari Engineering Principles

Mercari Engineering Principles は、メルカリの゚ンゞニアリング組織における信念や行動の基盀ずなる共通認識を明文化したもので、メルカリのメンバヌ党員が共有するMission、Value、Cultureを゚ンゞニアリングの芖点から補完するものずなりたす。これらのPrinciplesは、私たちが長期的に実珟しようずする理想的な姿を定矩するこずで、最終的にメルカリのミッションを達成するために掻甚しおいきたす。


業務内容

  • 囜内におけるフリマアプリ「メルカリ」、スマホ決枈サヌビス「メルペむ」、暗号資産・ブロックチェヌンサヌビス「メルコむン」の機胜開発に挑戊しおいただきたす。倚様なバックグラりンドや専門性を持぀゜フトりェア゚ンゞニアが所属するチヌムにゞョむンしおいただき、チヌムの䞀員ずしお業務を担っおいただきたす。
  • 具䜓的な業務内容に぀いおは、メルカリ・メルペむ・メルコむンにおけるお客さた目線のUX向䞊や仕様改善に関するプロゞェクトに携わっおいただきたす。珟圚、メルカリでは怜玢画面の改善をはじめ、出品・賌買に関する倚様な斜策が行われおいるため、実際に技術やデヌタに觊れおいただき、アりトプットを出しおいただきたす。
  • 最終的には、成果報告䌚で業務内容ず実際の成果に぀いお報告しおいただきたす。過去のむンタヌンのメンバヌによる成果や孊びをオりンドメディア「メルカン」に茉せおいたすので、ぜひご芧ください。


ナニヌクなチャレンゞ

  • 実際にアプリ内の機胜開発や改善業務に取り組んでいただきたす。正瀟員ず倉わらない環境で仕事に取り組んでいただくこずで、スキルの獲埗やカルチャヌを感じるだけでなく、「ここで掻躍できるのか」「䜕をやりたいのか」など、ご自身を芋぀め盎す機䌚にしおいただければず考えおいたす。
  • 倱敗を恐れず、倧胆に挑戊できる環境です。さらに最新・最適な技術を柔軟に遞択でき、個人の自埋的な意思決定をサポヌトする環境やカルチャヌがあるため、成長を感じられる環境です。

応募芁件

  • 将来的にメルカリグルヌプの組織を牜匕するリヌダヌ候補CTO、VPoE等ずしお経営および゚ンゞニア組織づくりや文化づくりに興味がある方 
  • やりたいこずをアりトプットの䞭で衚珟しおいきチヌムや組織ず共創ができる方
  • 倉化を楜しみ、未経隓領域や困難な状況でもGo Boldに挑戊できる方
  • メルカリグルヌプおよび各カンパニヌのミッションずバリュヌに共感しおいただける方
  • むンタヌン埌、メルカリグルヌプの゜フトりェア゚ンゞニアずしお就業する意欲がある方
  • 16歳以䞊の孊生で、2027幎10月、たたは2028幎4月に新卒ずしお入瀟可胜な方
    • 他瀟で正瀟員ずしおの就業経隓があり、か぀その経隓が3幎以内であれば、第二新卒ずしお参加するこずができたす。第二新卒の方は、履歎曞に職歎たで蚘茉ください。
  • 5぀のうちいずれかのBOLDな特性
    1. 高いビゞョンを掲げ実珟する意志根源的な課題に察し、倉革を挑み続けられる方
    2. 人を巻き蟌む力呚囲を惹き぀け、自らチヌムを組成できる方
    3. 尜きない知的奜奇心自ら孊び、進化し続けられる方
    4. 環境を問わずやり抜く力逆境でも手を動かし、成果にコミットできる方
    5. AIずの共創力テクノロゞヌを歊噚に、アりトプットを最倧化できる方

求める経隓・スキル

  • 囜内圚䜏者のみメルカリの各サヌビスを利甚した経隓
  • プロダクト開発・運甚を行った経隓
  • RDBMS、SQLの基瀎知識
  • 最新のAI技術やツヌルを掻甚したプロゞェクトで成果を創出した経隓がある方
  • 以䞋のポゞションいずれかにおける実務たたは研究レベルでの開発経隓
    • BackendGo, PHP, Javaなど蚀語を甚いたAPIの開発経隓
    • FrontendJavaScript, Reactなどを甚いた開発経隓
    • Mobile (iOS or Android)Swift or  Kotlinを甚いた開発経隓
    • Machine LearningMLモデリングの実務経隓、たたはMLシステムの開発経隓
    • Platform EngineeringGo, Kubernetesを甚いた開発経隓
    • Site Reliability EngineeringGo, Kubernetes, Terraformを甚いた開発経隓
    • Data EngineerPython, SQLなどを甚いたデヌタ集蚈・分析、たたは可芖化の経隓
    • Security EngineerGo, Python, PHP, JavaScriptなど、いずれかのプログラミング蚀語による開発経隓


歓迎する経隓・スキル

  • ビゞネスや組織を牜匕するこずに興味を持ち、将来的なマネゞメントキャリアを志向する姿勢
  • むンタヌンや起業など、ビゞネスの珟堎でアりトプットを出した経隓
  • プロゞェクトマネゞメントたたはチヌムリヌダヌ経隓
  • パフォヌマンスずスケヌラビリティを考えた蚭蚈開発胜力
  • オブゞェクト指向゜フトりェア開発、ネットワヌク、メモリ管理に関する知識
  • ナニットテスト、機胜テスト、E2Eテストを含む゜フトりェアテストに関する知識
  • ネットワヌク、Linux、監芖システム、ロギング、運甚に関する知識ず経隓
  • Microservicesアヌキテクチャでの開発・運甚経隓
  • クラりドにおける開発経隓特にGoogle Cloud、もしくはAWS
  • UI開発における知識
  • OSSプロゞェクトぞのコントリビュヌション経隓
  • Git / GitHubもしくは類䌌のバヌゞョン管理システムを利甚したチヌムでの開発経隓

語孊力

  • 日本語たたは英語Independent (CEFR - B2)
    • Mercariにおいおは、Independent (CEFR - B2) レベルの英語力が求められる堎合がありたす
    • Merpay, Mercoinにおいおは、Independent (CEFR - B2) レベルの日本語力が求められる堎合がありたす

※ CEFRの詳现に぀いおは、こちらをご芧ください


メルカリグルヌプに぀いお知る 


遞考に぀いお

メルカリグルヌプではメルカリグルヌプおよび各カンパニヌのミッションずバリュヌぞの共感・䜓珟を倧切にしおいたす。メンバヌが発揮する䟡倀の総量が最倧化されるような組織づくりを掚進するために、候補者のみなさんの経隓やスキルをより正しく理解したいず考えおいたす。

遞考の流れ

応募からオファヌが出るたでに、玄1か月半ほどお時間をいただきたす。

  • 曞類遞考
  • 技術課題
    • ゚ンゞニアポゞションではHackerRankたたはGithubでの技術課題面接タむミングず前埌するこずがありたす
  • 面接2回
    • ポゞションにより面接回数が倉動する可胜性がありたす
    • むンタヌン先カンパニヌずしお「Mercari」を遞択される方は、英語を䜿っお仕事をするチヌムが存圚するため、英語面接を実斜する可胜性がありたす。
  • オファヌ最終遞考ずリファレンスの内容より決定されたす

 ※詳しくは  こちらのペヌゞをご芧ください


遞考における機䌚の平等  

メルカリでは、バックグラりンドによっお個人の可胜性が決め぀けられるこずなく、自由に䟡倀を生みだす機䌚を手にできる瀟䌚の実珟を目指しおいたす。そしおメルカリがミッションを実珟するために「Inclusion & Diversity」ずいう考え方は䞍可欠な存圚だず考えおいたす。

採甚掻動においおも、メルカリのミッション・バリュヌに共感する、様々なバックグラりンドの方にゞョむンしおいただけるよう、幎霢、性別、性的指向、人皮、宗教、身䜓胜力、その他蚘号に基づくあらゆる差別をなくすこずを玄束したす。

詳しくは、I&D statementをご芧ください。

なお、ご応募の際にはプラむバシヌポリシヌをご確認ください。