Software Engineer, Backend at Mercari Group

Location: Tokyo
Type: Full-time
Posted: Jul 1, 2026

Description

Merpay is seeking a full-time Software Engineer specializing in backend credit systems. The role involves developing microservices and APIs using Go, designing interfaces with Protocol Buffers and gRPC, analyzing user activity logs, and optimizing performance. Candidates should possess strong database schema design skills, experience with secure web application operations, and proficiency in streamlining development workflows using Generative AI. The position offers a flextime system and is located in Roppongi.

Required Skills

Go
Protocol Buffers
Data Analysis
Microservices Optimization
Database Design
Web Application Security
Generative AI Workflow Optimization
Software Architecture Design
Agile Methodology

Additional Information

Required Previous Experiences: web application development
Schema design and efficient query creation in databases (RDB, NoSQL, etc.)
operating/tuning web applications, and knowledge of security
streamline development workflows using Generative AI
designing software architecture and selecting middleware
proactively drive software development with ownership
Preferred Qualifications: Development/operations experience with Go and GCP
Development/operations experience with large-scale traffic systems
taking on challenges during the launch of new services or during the growth phase of a service
leading development, management, and process improvement
data analysis based on statistical methods