Software Engineer, Backend Architect at Mercari

Setup: Hybrid
Location: Tokyo
Type: Full-time
Posted: Apr 17, 2026

Description

Mercari is seeking a Full-Time Software Engineer, Backend Architect to design and implement high-level architecture, share best practices, and resolve technical issues. This role involves collaborating with cross-functional teams to align on architectural standards and continuously learning new technologies. The successful candidate will contribute significantly to improving the quality, stability, security, and scalability of Mercari's backend technology, especially within the fintech space and anticipating shifts towards AI.

Required Skills

backend technology
data models
network protocols
technical problems
microservice architecture
Go language
cloud computing
container technologies
security systems
design documentation
OSS culture

Additional Information

Required Previous Experiences: Experience in developing and operating in backend or infrastructure technology domains.
Experience in designing data models using RDBMS and NoSQL.
Experience using knowledge of network protocols such as TCP/IP and HTTP.
Experience in discovering and resolving causes of technical problems (e.g., performance degradation) in systems.
Experience in independently discovering technical problems and solving cross-organizational issues.
Preferred Qualifications: Experience developing with Go.
Experience developing in the cloud using GCP or AWS.
Experience developing systems using container technologies such as Docker and Kubernetes.
Experience in software development and operation based on microservice architecture.
Experience designing secure systems based on authentication and authorization.
Experience making technical decisions using DesignDoc and ADR.
Possess a perspective that considers organizational productivity, not just individual productivity.
Skilled at understanding abstract requirements and making them universally easy to use.
Ability to continuously develop/improve services, considering their operational costs.
Ability to propose/execute solutions for various domain issues if necessary, without sticking to a specific area.
Experience developing/operating internal managed services and SDKs.
Experience solving internal issues through OSS development and contributions.

About Mercari

Mercari

Discover deals on everything from secondhand fashion to pre-owned collectibles, electronics, books & more on Mercari. Your go-to marketplace for hassle-free selling and deals.