Software Engineer, Backend (Monolith operation & Modernization) - Mercari

JD in Japanese follows. 英文の後に和文JDをご覧いただけます。

Software Engineer, MAPI - Mercari

• 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

In the Mercari API Team, our primary focus is on the development and management of the monolith service, with two main objectives: migration and maintenance. The first objective involves migrating all critical dependencies out of the monolith service. This requires a deep understanding of how the service has evolved over time, as well as close collaboration with relevant teams to ensure a smooth migration process. The second objective focuses on maintaining the monolith service to ensure stability and resilience. This involves adopting an SRE mindset to keep the service reliable through activities such as service operations, performing language and security updates, and working with relevant teams to enforce best practices in monolith service development.

See here for more information about our mission and values.

Work Responsibilities

• Migrate the PHP-based service APIs to Go-based services. This involves coordinating with client teams (iOS, Android, Web) and the service owner teams to ensure end-to-end migration is successful. While you are not responsible for writing client-side code, you will need to collaborate effectively with these teams to manage the migration process.
• Provide support to PHP-dependent teams by assisting in development efforts using Mercari's PHP-specific framework.
• Maintain and improve the PHP framework by performing language upgrades, library updates, and applying security fixes as needed.
• Oversee the operation of the PHP-based monolith service. Even as migration efforts are underway, you will ensure the stability and reliability of the current service through effective monitoring and operations.

Unique Challenges

• Migrating critical, legacy features from the monolith service to modern architectures while ensuring minimal disruption.
• Operating and maintaining a critical high-traffic service, requiring a strong focus on stability and reliability.
• Gaining a deep understanding of how Mercari's C2C platform functions through hands-on experience during the migration process.
• Contributing to and navigating a large-scale migration project with multiple stakeholders and dependencies.

Qualifications

• Required Experience/Skills
• Experience in backend engineering for mission-critical services.
• Hands-on experience being on-call for mission-critical high-traffic backend systems, with a focus on ensuring reliability and stability.
• Familiarity with programming languages such as PHP and Go (while not primary requirements, these will be advantageous), as well as a basic understanding of Kubernetes and Terraform.
• Strong communication skills to effectively coordinate with relevant teams during migration efforts.
• Ability to understand and align with Mercari's technical direction while contributing to service growth and scalability.
• Preferred Experience/Skills
• Expertise in “software archaeology," with the ability to analyze and understand the history and evolution of legacy codebases and resources.
• Familiarity with implementing and maintaining observability for large-scale monolith systems to ensure service reliability.
• Language
• Japanese: Proficient (CEFR-B2) required
• English: Intermediate (CEFR-B1) required

For details about CEFR, see here .

Learn More About Mercari Group

• Careers site: https://careers.mercari.com/en/
• Mercan: https://mercan.mercari.com/en/
• 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.

Software Engineer, MAPI - Mercari

• 雇用形態： 正社員
• 働き方： フレックスタイム制（コアタイムなし・フレキシブルタイムなし）
• 勤務地： 六本木

詳細はキャリアサイトの 募集要項 よりご確認ください

メルカリグループについて

あらゆる価値を循環させ、あらゆる人の可能性を広げる

「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。

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。

組織・チームのミッション

Mercari Engineering Principles

Mercari 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。

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

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

• Mercari APIチームでは、モノリスサービスの開発とオペレーションに主に注力しており、「移行」と「保守」の2つの主要な目的を持っています。「移行」の目的は、モノリスサービスからすべての重要な依存関係を移行することです。これには、サービスがどのように進化してきたかを深く理解すること、そしてスムーズな移行プロセスを確保するために関連チームと密接に連携することが求められます。「保守」の目的は、モノリスサービスの安定性を確保するための保守に焦点を当てています。これには、SREのマインドセットを持ち、サービス運用、言語やセキュリティの更新、モノリスサービス開発におけるベストプラクティスを関連チームと協力して実施する活動が含まれます。

• メルカリのミッション・バリューについての詳細は こ ちら をご覧ください

業務内容

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