[Mercari] Challenge Yourself to Build the Foundation Supporting Both Merchant Payments and Customer Asset Management | Software Engineer, backendEnglish summary from Japanese

株式会社メルカリ

✓ Detailed

Salary

7 million yen - 15 million yen

Role summaryEnglish summary from Japanese

English summary for screening — check the original posting before applying.

Mercari is seeking a backend Software Engineer to build foundational systems for merchant payments and customer asset management. You will design, develop, and operate microservices and APIs, focusing on reliability, performance, and architectural design within complex financial domains.

Must-haves

3+ years of experience in web application or backend system development/operation
Experience with large-traffic systems or large-scale distributed databases (RDB/NoSQL/NewSQL)
Skills in DB schema design, efficient data modeling, and query creation
Experience in web application operation/tuning and knowledge of security
Experience in software architecture design and middleware selection
Ability to organize ambiguous problems and create technical solutions in collaboration with stakeholders
Ability to improve team productivity by practicing development flow efficiency using generative AI
Ability to define and drive development with ownership even for ambiguous problems

Nice-to-haves

Experience with Go, Google Cloud (Kubernetes, Spanner, Terraform, etc.)

About the Company

株式会社メルカリ

Headquarters

東京都港区六本木6-10-1 六本木ヒルズ森タワー18F

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Posted8/14/2026

Sourcefindy

Experience in systems requiring high data integrity and accuracy (payment platforms, credit, accounting, KYC, AML/CFT)

Experience leading technical debt resolution, re-architecting, or phased migration of legacy systems

Experience leading developers, mentoring, and improving development processes

Experience scaling systems during new service launches or rapid growth phases

Experience with large-scale data processing, batch processing, or event-driven architectures

Experience with data platforms and data integration using BigQuery/Dataflow

Experience designing/operating systems considering internal controls, audits, J-SOX, ISMS, SOC2

Tech stack

GoProtocol BuffersgRPCREST APIGoogle CloudKubernetes EngineCloud SQLSpannerBigQueryPub/SubCloud StorageDataflowTerraformDatadogPagerDutySentryGitHub ActionsArgo CDSpinnakerConfluenceNotionClaude EnterpriseGeminiCursorGitHubSlack

Work style

Full-time, onsite in Tokyo (Minato-ku, Roppongi). Flexible working hours with no core time. Standard working hours: 8 hours/day.

Other notes

Salary: Monthly salary starting from ¥467,600. Annual salary range: ¥7,000,000 - ¥15,000,000. Bonus twice a year. Probation period: 3 months (same conditions as regular employment).