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Mercari

Software Engineer, iOS (Platform Product) - Merpay

Software Engineer, iOS - Merpay

Tags: Full-time, Basic Japanese

Roppongi, Tokyo, Japan・Fetched Today

Job Description

Employment Type: Full-time
Team: Engineering

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

Software Engineer, iOS - Merpay

  • 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:

Team mission and expectations of the role

  • We are looking for a professional iOS engineer to to take ownership from planning through development for Merpay’s new payment and finance services, based on the company’s mission of “building trust for a seamless society.”
  • At Merpay, multiple iOS engineers are assigned to each domain and drive their respective domains forward. In this position, you will leverage deep expertise in iOS app development using Swift, collaborating with product managers, designers, backend engineers, and QA/Test engineers. 
  • As part of the Merpay Platform, you will work on developing core product features (such as identity verification, bank integrations, and our internal server-driven UI infrastructure), as well as features to drive growth initiatives.
  • In addition to feature development, you will also focus on improving quality, testing, automation, and stabilizing releases, actively improving the developer experience.
  • In the future, we welcome engineers who are willing to proactively work beyond traditional role boundaries of an iOS app engineer, including working across Android, Web, backend, or even into roles such as product management or QA.
  • We are strongly promoting an AI-native approach. At the same time, we place great importance on ensuring we never compromise correctness, security, privacy, or user trust. Rather than whether AI tools are used, we value the ability to properly validate outputs and take full responsibility for quality in development.
  • You will work in a diverse, global environment with team members from various backgrounds, including English speakers. While perfect English proficiency is not required at this stage, we welcome those who are comfortable working in English.
  • We encourage and value external contributions such as:
    • Speaking at domestic and international conferences such as try! Swift and iOSDC
    • Writing articles on the Mercari Engineering Blog
  • For more details about Mercari’s mission and values, please refer to the following.

See here for more information about our mission and values.


Work Responsibilities

Job Description

  • Design, development, and improvement of new features related to Merpay’s core platform functions
    (e.g., identity verification, bank integrations, internal server-driven UI infrastructure)
  • Team-based development in collaboration with product managers, designers, backend engineers, and QA/Test engineers
  • Improving code quality and enhancing the development environment
  • Conducting code reviews for team members
  • Creating prototypes and proofs of concept (POCs) to introduce new iOS-related technologies

Tech Stack

  • SwiftUI
  • Combine, Concurrency
  • Protocol Buffers
  • Bazel
  • GitHub Actions
  • Claude Code
  • Cursor
  • Internal AI agents

Note: These are the primary technologies currently in use. Experience with all of them is not required at the time of joining.



Unique Challenges

  • Delivering one of Japan’s leading smartphone payment apps to users with both high speed and high quality to millions of users
  • Tackling challenges that require advanced development skills, including standard security practices in financial/payment services as well as mobile app–specific security considerations
  • Navigating both iOS platform constraints and business requirements
  • Collaborating in a team with members from diverse backgrounds, including different languages, genders, and nationalities
  • Going beyond feature development to evolve the developer experience and AI-native development workflows themselves

Qualifications

Required Experience & Skills

  • Alignment with the mission and values of the Mercari Group and its companies
  • Passion for the financial services domain
  • Experience developing native iOS applications using Swift
  • Knowledge of iOS standard libraries and frameworks
  • Experience in team-based application development in collaboration with product managers, designers, backend engineers, and QA
  • Willingness to go beyond iOS and work across adjacent domains when needed
  • Strong interest in AI-native development, with the ability to validate correctness, maintainability, and safety

Preferred Experience & Skills

  • Experience developing and operating native applications with a large user base
  • Deep knowledge of UI development using SwiftUI
  • Experience in Fintech or KYC domains
  • Strong knowledge of writing testable code
  • Experience with development process and release automation
  • Hands-on experience with the Bazel build system
  • Knowledge of performance optimization
  • Contributions to OSS, technical blogging, or speaking at conferences

Language Requirements
Candidates should meet one of the following:

  • English: Independent (CEFR B2) / Japanese: Basic (CEFR A2) — preferred
  • Japanese: Independent (CEFR B2) / English: Basic (CEFR A2) — preferred

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

  • 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.



Software Engineer, iOS - Merpay

  • 雇甚圢態正瀟員
  • 働き方フレックスタむム制コアタむムなし・フレキシブルタむムなし 
  • 勀務地六本朚

詳现はキャリアサむトの募集芁項よりご確認ください

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

  • 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。
  • Passion For The Product
  • Grow Together
  • Solve Through Mechanisms
  • Collaborate Openly

  詳现に぀いおぱンゞニアリングカルチャヌ  をご芧ください

チヌムのミッション・求められる圹割

  • 「信甚を創造しお、なめらかな瀟䌚を創る」ずいうミッションのもず、メルペむが手掛ける新しい決枈・金融サヌビスを共に䌁画から開発たでしおいくプロフェッショナルなiOS゚ンゞニアを募集しおいたす。
  • メルペむでは領域ごずに耇数名のiOS゚ンゞニアが所属しおそれぞれの事業を掚進したす。
  • このポゞションでは、Swift を甚いた iOS アプリ開発の深い専門性を軞に、プロダクトマネヌゞャヌ・デザむナヌ・バック゚ンド゚ンゞニア・QA / Test ゚ンゞニア ず協働しながら、メルペむのPlatformずしおプロダクト機胜開発本人確認、銀行接続、瀟内Server-Driven UI基盀などやGrowth 斜策のための機胜開発を行いたす。
  • たた機胜開発だけではなく、品質改善、テスト、自動化、リリヌスの安定化など、開発者䜓隓の向䞊に取り組みたす。
  • 将来的にはAndroid/Web/バック゚ンド、たたプロダクトマネヌゞャヌやQAなど、iOS App Engineer の圹割を超えた越境をしおいくこずを歓迎したす。
  • 私たちは AI-Native を力匷く掚進しおいたす。䞀方で、正しさ・セキュリティ・プラむバシヌ・ナヌザヌの信頌を損なわないこずを重芖しおいたす。AI ツヌルの利甚有無そのものより、適切に怜蚌し、品質責任を持っお開発を進められるこずを倧切にしおいたす。
  • 英語を含む倚様なバックグラりンドのメンバヌず協働する環境です。珟時点で完璧な英語力は必須ではありたせんが、英語で仕事を進めるこずに抵抗がない方を歓迎したす。
  • そのほか、䞋蚘のような倖郚ぞのアりトプットも掚奚されおおり、それらが評䟡される環境です。
    • try! Swift、iOSDCずいった囜内倖のカンファレンスでの講挔
    • Mercari Engineering Blog䞊での蚘事執筆
  • メルカリのミッション・バリュヌに぀いおの詳现はこちらをご芧ください

業務内容

具䜓的な業務内容は䞋蚘のずおりです。 

職務内容

  • メルペむの基盀機胜に関する新機胜蚭蚈・開発及び改善
    • 本人確認, 銀行接続, 瀟内Server-Driven UI基盀など
  • プロダクトマネヌゞャやデザむナヌ、バック゚ンド゚ンゞニア、QA/テスト゚ンゞニアず連携したチヌム開発
  • コヌドの品質の改善や開発環境の改善
  • チヌムメンバヌのコヌドレビュヌ
  • 新しいiOS関連技術の導入のためのプロトタむプやPOCの䜜成

技術環境

  • SwiftUI
  • Combine, Concurrency
  • Protocol Buffers
  • Bazel
  • GitHub Actions
  • Claude Code
  • Cursor
  • 瀟内AI Agent

※これらは珟時点での䞻な利甚技術であり、入瀟時点ですべおの経隓が必須ではありたせん

ナニヌクなチャレンゞ

  • 囜内有数のスマホ決枈アプリを高速か぀高品質で䞖の䞭に提䟛するこず
  • 高い開発スキルや金融・決枈領域のサヌビスにおける䞀般的なセキュリティ察応、及びモバむルアプリ特有のセキュリティ察応などのチャレンゞ。
  • iOS platform constraints ず business requirements の䞡方を扱うこず
  • 蚀語・性別・囜籍などの倚圩な背景をも぀メンバヌずのチヌム開発をするこず
  • 機胜開発だけでなく、開発者䜓隓やAI-Native におけるdevelopment workflow そのものも進化させられるこず 

応募芁件

  • 求める経隓・スキル
    • 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
    • 金融事業の領域ぞの情熱
    • Swiftを利甚したiOS向けネむティブアプリケヌションの開発経隓
    • iOS暙準ラむブラリ・フレヌムワヌクに぀いおの知識
    • プロダクトマネヌゞャヌ / デザむナヌ / バック゚ンド / QA ず連携したチヌムでのアプリケヌション開発経隓
    • iOS を軞にしながら、必芁に応じお呚蟺領域にも越境する意欲
    • AI-Native ぞの匷い関心、正しさ・保守性・安党性を怜蚌できる姿勢
  • 歓迎する経隓・スキル
    • 倧芏暡ナヌザヌを持぀ネむティブアプリケヌションの開発・運甚経隓
    • SwiftUIを甚いたUI開発における深い知識
    • Fintech・KYC領域の開発経隓
    • テスト可胜なコヌドを曞くための豊富な知識
    • 開発プロセスおよびリリヌスの自動化の経隓
    • Bazelビルドシステムを䜿った業務経隓
    • パフォヌマンス最適化に぀いおの知識
    • OSSぞの貢献、技術ブログ、カンファレンス登壇経隓
  • 語孊力

   以䞋のうち、どちらかに該圓するこず 

    • 英語Independent (CEFR - B2) / 日本語Basic (CEFR - A2) 歓迎
    • 日本語Independent (CEFR - B2) / 英語Basic (CEFR - A2) 歓迎

   ※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

  • 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での技術課題を、゚ンゞニア以倖のポゞションでは採甚ポゞションによりたす面接タむミングず前埌するこずがありたす
  • 面接ポゞションにより、耇数回の面接をお願いしたす
  • リファレンスオンラむン回答圢匏のもので、最終遞考の前埌でお願いしたす
  • 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  ã“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。