Senior Software Engineer, Autonomous Cloud Network - Mercari

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

Senior Software Engineer, Autonomous Cloud Network - 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: https://careers.mercari.com/positions/

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: https://careers.mercari.com/culture/

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 Engineering Culture: https://engineering.mercari.com/en/culture/ . See here for more information about our mission and values: https://careers.mercari.com/culture/

Our team's mission is to make the communication between our customers and our systems smooth, reliable, and secure.

• The network is the critical bridge that connects users to Mercari's applications and the systems behind them. These systems are complex, widely distributed, and composed of diverse data paths.
• The Networking Platform team helps Mercari engineers deliver more reliable services and improve development efficiency by providing network infrastructure and DevOps support. We manage the entire network, from edge areas such as the CDN to the cloud, service mesh (Istio), and physical data centers.

Work Responsibilities

• Design, develop, and evolve the cloud networking and infrastructure that supports the entire business
• Design and implement networking/infrastructure solutions that support our global and multi-region strategy
• Improve systems to reduce operational engineering cost
• Support the migration and adoption of new platform features and tools
• Improve and drive security and reliability in collaboration with the SRE and Security teams
• Automate day-to-day platform operations to improve efficiency and reduce toil
• Collaborate with internal developers to understand their needs and deliver solutions

Unique Challenges

In this position we are looking for a software engineer with knowledge of, or interest in, developing platform network and infrastructure systems, with hands-on DevOps and coding experience. The ideal person is passionate, proactive, and able to see an imperfect system as an opportunity rather than a problem. This role suits someone who enjoys rolling up their sleeves to shape the environment and drive impactful improvements, who can identify and solve problems on their own, and who can steadily add features to large-scale systems.

Qualifications

Required Experience/Skills

• Strong networking fundamentals (TCP/IP, IP address management, OSI layers 4–7, cloud routing, CDN, DNS, TLS, HTTP)
• Production experience building and operating cloud networks using GCP or AWS
• Production experience building and operating Linux and Kubernetes networking
• Knowledge of network proxies (Envoy, HAProxy, Nginx) and regional/VPC routing
• Production experience operating CDNs (e.g., edge/cache configuration, multi-CDN, performance and security)
• Production experience with a service mesh such as Istio (e.g., traffic management, reliability practices)
• Ability to automate network-related workflows using any familiar language ( Go, Python or Bash etc ) and to deliver capabilities as a service
• Experience managing network configuration using Infrastructure as Code (IaC)
• Experience writing design documents, collaborating with stakeholders, and making technical decisions
• A track record of developing tools for internal users and improving platform operations
• On-call and production troubleshooting experience for reliability-critical systems (incident response, debugging, and root cause analysis)
• Empathy with Mercari's mission and values

Preferred Experience/Skills

• Passion for delivering a pleasant user experience through the platform and supporting operational efficiency
• Experience building and operating networks in large-scale distributed systems composed of hundreds of microservices
• Production experience operating service meshes such as Istio or Linkerd
• Experience architecting scalable, highly available infrastructure or middleware (e.g., control planes, Kubernetes operators/CRDs, or service-as-a-platform APIs)
• Experience with agent-driven workflows and usage of agentic tools such as Claude, Cursor, and Codex
• Experience developing and maintaining CI/CD pipelines (e.g., GitHub Actions, Argo CD)

Language

• English: Proficient (CEFR – C1)
• Japanese: optional, but preferred

For details about CEFR, see https://www.coe.int/en/web/common-european-framework-reference-languages/ .

Learn More About Mercari Group

• Careers site: https://careers.mercari.com/
• Mercan: https://mercan.mercari.com/
• Social media: X https://twitter.com/mercari_eng / LinkedIn https://www.linkedin.com/company/mercari/
• How we reorganize the platform team
• Legacy Image Provider to Cloudflare Images: Traffic Estimation and Safe Rollout
• Kubernetes Cluster migration on the Mercari Microservices Platform

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: https://careers.mercari.com/interview/

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: https://careers.mercari.com/privacy/

シニアソフトウェアエンジニア（自律型クラウドネットワーク） - Mercari

• 雇用形態： 正社員

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