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Software Engineer, SRE - US App

Salary not provided

AWSAzureDockerKubernetesPHPGoMySQLGrafanaGCP
English: Fluent

Minimum year of experience: 5

Mercari

Software Engineer, SRE - US App

Employment Status: Full-time
Work Hours: Full Flextime (no core time)
Office: Roppongi

Organization/Team Mission

Our mission is to help buyers discover the most relevant items and empower sellers by improving their visibility in the US marketplace. We aim to provide a fast, trustworthy, and effective search experience that connects millions of users with what they’re looking for—seamlessly and at scale.

The Search team handles end-to-end development and operation of the search system, focusing on relevance tuning, query understanding, and infrastructure reliability. Built on Elasticsearch, our system manages high query volumes and dynamic inventory with stability, freshness, and cost efficiency.

Recent or ongoing initiatives:

  • Modernizing our ranking and retrieval pipeline to improve conversion, engagement, and search precision
  • Strengthening platform stability and flexibility through real-time indexing, cache optimization, search traffic resilience, and observability tooling
  • Collaborating with product, backend, and infrastructure teams across regions to build a world-class search experience

Work Responsibilities

  • Operate and maintain shared components used by multiple teams in the US, impacting overall production reliability
  • Define and measure system reliability goals using SLO/SLIs
  • Continuously monitor capacity, performance, and cost of systems in production and development
  • Build, run, and integrate software to improve availability, scalability, latency, and efficiency
  • Define, manage, and run incident management processes (on-call, incident response, postmortem)
  • Mentor junior engineers, lead code reviews, and contribute to architectural decisions and technical documentation
  • Collaborate with cross-functional teams including product, engineering, and QA to deliver high-impact features and improvements

Unique Challenges

  • Join a small distributed team overseeing the entire US infrastructure, delivering value to millions of daily users
  • Take ownership and help shape domain vision—each team member can specialize in specific areas (e.g., observability, developer experience, databases)
  • Collaborate closely with product/marketing and other cross-functional teams to ensure user-focus and flexible team priorities
  • Represent the US team for group-wide shared platform components
  • Work globally with team members in both Tokyo and the US

Qualifications

Required

  • 5+ years of experience working with and administrating:
    • Production DBMS/MySQL clusters
    • Cloud native environments (GCP/AWS/Azure)
    • Docker and Kubernetes
  • 5+ years of professional experience maintaining and operating infrastructure
  • Bachelor’s degree in Computer Science, Software Engineering, or related field (or equivalent practical experience)
  • Experience optimizing performance of databases, networking, and microservices
  • Strong programming expertise in any language
  • Excellent English communication skills and ability to collaborate across teams and regions
  • Demonstrated ability to mentor and guide junior engineers

Preferred

  • Experience with LGTM Stack (Loki, Grafana, Tempo, Mimir) or OpenTelemetry
  • Experience working with Cloudflare, Istio, GKE
  • Experience building and operating microservices at scale in PHP or Go
  • Marketplace or e-commerce platform domain knowledge
  • Experience with large, cross-functional, and geographically distributed teams

Language

  • English: Business level (CEFR B2 or higher) required

Recruiting Process

  • Application screening
  • Skill assessment (engineering roles may complete assessment via HackerRank or GitHub)
  • Interviews (number and format may vary)
  • Reference check
  • Offer

Learn more about our recruiting process.

Equal Opportunity Hiring

We strive to realize a world in which no one’s potential is limited by their background and everyone can create value. We are committed to eliminating discrimination based on age, gender, sexual orientation, race, religion, physical disability, and other factors so that anyone who shares our mission and values can join us.

Read our Inclusion & Diversity statement.

Please read and acknowledge our Privacy Policy before submitting an application.

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