Mercari is a Japanese e-commerce company operating a marketplace platform where users can buy and sell items.

Mercari, a leading Japanese e-commerce marketplace, is seeking a Cloud Networking Software Engineer to join their team in Tokyo, Japan. This is a hybrid role that requires Japanese language proficiency and expertise in cloud networking infrastructure.

The position offers an exciting opportunity to work with one of Japan's most successful technology companies, contributing to the development and maintenance of their cloud networking infrastructure. As a mid-level software engineer, you'll be part of a team responsible for ensuring the reliability and performance of Mercari's cloud-based systems.

This role is ideal for candidates who have experience with cloud infrastructure and networking, and are either already based in Japan or willing to relocate. Mercari provides comprehensive relocation support and visa sponsorship for international candidates who meet the requirements.

The company is known for its inclusive work culture and commitment to diversity, offering a supportive environment for international professionals. Working at Mercari means being part of a company that values innovation and technical excellence while maintaining a strong focus on user experience and market leadership in the e-commerce sector.

Key aspects of the role include working with cloud networking technologies, collaborating with cross-functional teams, and contributing to the scalability and reliability of Mercari's infrastructure. The hybrid work arrangement offers flexibility while maintaining opportunities for in-person collaboration and team building.

For candidates interested in advancing their career in Japan's technology sector, this position provides an excellent opportunity to work with modern cloud technologies while being part of a company that's shaping the future of e-commerce in Japan and beyond.

Software Engineer, Cloud Networking position at Mercari in Tokyo, Japan. Japanese speaking cloud networking engineer role with relocation support.

Software Engineer, Cloud Networking - Mercari (Japanese Speaker)

Mercari is a marketplace app company founded in 2013 that aims to circulate all forms of value to connect people worldwide through technology.

Mercari, a leading marketplace app company founded in 2013, is seeking a Senior Software Engineer to join their Search team for the US App. This role is crucial in helping buyers discover relevant items and empowering sellers by improving their visibility in Mercari's US marketplace. The position is based in Tokyo, Japan, with a hybrid work arrangement and offers full flextime scheduling.

The Search team is responsible for end-to-end development and operation of the search system, built on Elasticsearch, handling high query volumes and constantly evolving inventory. Recent initiatives include modernizing ranking and retrieval pipelines, strengthening platform stability, and improving search precision.

As a Senior Software Engineer, you'll work on challenging projects that directly impact millions of users, including optimizing search relevance, implementing real-time indexing, and enhancing cache optimization. You'll collaborate with cross-functional teams across the US and Japan, contributing to architectural decisions and mentoring junior engineers.

The role requires strong expertise in search technologies, microservices architecture, and programming languages like Java or Go. You'll need 5+ years of professional experience and excellent English communication skills. The position offers opportunities to work with cutting-edge technologies, contribute to open-source projects, and be part of a globally distributed team.

Mercari values diversity and inclusion, working towards a world where no one's potential is limited by their background. The company offers a comprehensive recruitment process, professional development opportunities, and a culture built on strong engineering principles including Passion For The Product, Grow Together, Solve Through Mechanisms, and Collaborate Openly.

Senior Software Engineer position at Mercari focusing on search infrastructure and backend services for the US marketplace app, requiring 5+ years of experience and expertise in search technologies.

Software Engineer, Search - US App

Mercari is seeking a Software Engineer to join their Search team for the US App. This role is based in Tokyo, Japan, with a hybrid work arrangement. The position focuses on improving and maintaining the search functionality of Mercari's marketplace platform, which is crucial for connecting buyers with the right products. As a mid-level engineer, you'll be working with a team to enhance search algorithms, improve relevancy, and optimize performance. The role requires relocation to Japan for international candidates, and the company values diversity and inclusion in their workplace. Mercari offers a collaborative environment where engineers can make significant impact on a platform used by millions of users. The position requires strong technical skills and the ability to work in a multicultural environment, with both English and Japanese language capabilities being valuable assets.

Mid-level Software Engineer position at Mercari, focusing on search functionality for the US App, based in Tokyo with hybrid work arrangement.

A global marketplace app company that enables value circulation through its platform, connecting people worldwide through technology.

Mercari is seeking a Cloud Networking Software Engineer to join their Platform team in Tokyo. This role is crucial in supporting Mercari's microservices architecture and global marketplace platform. The position focuses on managing and improving network infrastructure from edge services (CDN) to cloud, service mesh (Istio), and physical data centers.

The Networking Platform team plays a vital role in supporting Mercari's engineering organization by providing network infrastructure and DevOps support to enable reliable service delivery and improved development efficiency. Current projects include implementing and stabilizing Istio service mesh for microservices migration and managing the transition to region-based, VPC-native Kubernetes clusters while minimizing downtime.

The ideal candidate should have a strong foundation in network engineering principles and cloud infrastructure, with hands-on experience in automation and infrastructure as code. They will work on designing and implementing network solutions that support Mercari's global strategy, collaborating with SRE and security teams to enhance platform reliability and security.

This position offers unique challenges in managing large-scale distributed systems comprising hundreds of microservices. The role requires both technical expertise and the ability to work collaboratively with internal stakeholders. The successful candidate will have the opportunity to make significant impacts on Mercari's platform infrastructure while working in a flexible, hybrid environment.

Mercari values diversity and inclusion, welcoming candidates from all backgrounds who share their mission of creating a circular economy through technology. The company offers a supportive work environment with opportunities for professional growth and development in a global tech company.

Cloud Networking Software Engineer position at Mercari, focusing on designing and managing cloud infrastructure and network solutions for a global marketplace platform.

A marketplace app company focused on circulating all forms of value to unleash potential in people.

Mercari, a leading marketplace app company founded in 2013, is seeking a Security Engineer for their Threat Detection and Response (TDR) team. This role is crucial in protecting Mercari's customers, people, services, and infrastructure through advanced security operations.

The position combines detection engineering, incident response, threat hunting, and threat intelligence to build scalable security operations. Working in a fully cloud-native environment with multiple cloud providers and containerized workloads, you'll tackle complex threats at the intersection of large-scale consumer platforms and real-time financial services.

As a Security Engineer, you'll be responsible for expanding detection coverage, developing automation systems, handling security incidents, and building monitoring platforms. The role requires strong practical skills in automating security operations, deep understanding of cloud security, and a proactive mindset in threat detection and response.

The ideal candidate brings 5+ years of security operations experience, strong programming skills (Python/Go), and expertise in cloud infrastructure and security frameworks. You'll work in a dynamic, global environment where you'll leverage cutting-edge technologies, including AI and LLMs, to transform threat detection and response processes.

Mercari offers a flexible work environment with full flextime and no core hours. The company values diversity and inclusion, working towards a world where no one's potential is limited by their background. Join a team that's building the world's most secure marketplace while contributing to Mercari's mission of circulating value and unleashing potential in all people.

Senior Security Engineer role at Mercari focusing on threat detection, incident response, and security automation in a cloud-native environment.

Security Engineer, Threat Detection and Response

A Japanese technology company operating a marketplace app that facilitates C2C (customer-to-customer) sales of used items.

Mercari is seeking a Backend Software Engineer for their Mobile division, a newly launched service as of March. The role focuses on developing and scaling microservices using Go, with a strong emphasis on building robust APIs and infrastructure on Google Cloud Platform. The team operates in a hybrid work environment, combining in-office collaboration with remote work flexibility.

The position involves working with cutting-edge technologies including Protocol Buffers, gRPC, and various GCP services. Engineers will be responsible for designing and implementing microservices, optimizing performance, and contributing to the growth of Mercari's mobile service into a core business segment.

The development environment is modern and comprehensive, utilizing tools such as Terraform, Kubernetes, CircleCI, and various monitoring solutions like Datadog and PagerDuty. The team follows Agile methodologies and emphasizes both technical excellence and collaborative problem-solving.

This is an exciting opportunity to join a growing product at a significant scale, where engineers can experience both the stability of an established company and the dynamic pace of a startup. The role offers significant autonomy and the chance to impact a service that aims to revolutionize the intersection of mobile communications and marketplace experiences.

Candidates should be passionate about creating user-centric solutions and comfortable working in a fast-paced, collaborative environment. The position requires strong technical skills in Go and microservices architecture, along with the ability to communicate effectively in Japanese (CEFR C1 level required) and basic English skills.

The team culture emphasizes continuous learning, with regular study sessions and opportunities to work with AI tools and new frameworks. Engineers will participate in face-to-face discussions for design and specifications when in office, while having the flexibility to focus on development tasks during remote work days.

Backend Software Engineer position at Mercari Mobile division, focusing on Go microservices development and API design, with hybrid work arrangement in Tokyo.

Software Engineer, Backend - Mercari Mobile

A Japanese e-commerce company operating a C2C marketplace app that facilitates buying and selling between users.

Mercari is seeking a Backend Software Engineer for their Mobile division, a new service launched in March. This role is part of an initiative to grow Mercari Mobile into a main business pillar. The position offers a unique blend of startup agility with enterprise-scale infrastructure.

The team operates in a hybrid work environment, with two days per week in office for face-to-face communication and design discussions. They embrace modern development practices including AI tools and regular knowledge-sharing sessions. The tech stack is built on Go for microservices, utilizing Google Cloud Platform for infrastructure, with modern tools like Terraform, Kubernetes, and various monitoring solutions.

Engineers will work on developing microservices and APIs, designing system architecture, and implementing performance optimizations. The role involves working with cutting-edge technologies while contributing to a service that aims to revolutionize mobile communications by adding Mercari's unique value proposition.

The ideal candidate should have strong Go programming experience, database expertise, and solid understanding of web application security and performance optimization. Japanese language proficiency is required due to the nature of the work and team communication needs. The position offers the opportunity to work on high-impact projects while contributing to Mercari's mission of creating a circular economy and expanding possibilities for people worldwide.

A technology company that operates the Mercari marketplace app, focusing on circulating all forms of value to unleash potential in people.

Merpay, part of the Mercari Group, is seeking a QA Engineer to join their team in Tokyo. This role combines traditional QA practices with AI-driven testing solutions to ensure the highest quality of innovative products and services. The position offers unique challenges in a fast-paced fintech environment, working with cutting-edge technologies and AI-powered testing tools.

The ideal candidate will be responsible for comprehensive quality assurance across web, mobile, and backend systems, with a focus on implementing AI-driven testing solutions. You'll work in an agile environment using tools like GitHub, Playwright, BigQuery, and various AI assistance tools including Google Gemini and ChatGPT.

As a QA Engineer at Merpay, you'll be part of a small, dynamic team where you can take ownership and contribute proactively. The role offers significant opportunities for growth and innovation, especially in implementing AI-powered testing solutions and improving QA processes.

The position requires strong technical skills in software testing, experience with automation frameworks, and an understanding of AI applications in QA. You'll need to demonstrate excellent communication skills and be comfortable working in a bilingual environment (Japanese/English).

Key technologies and tools include:
- Testing frameworks: Jetpack Compose, XCUITest, Playwright
- Analytics tools: BigQuery, Looker, Datadog
- Project management: Jira, Confluence, TestRail
- AI tools: Google Gemini, Cursor, ChatGPT

This is an excellent opportunity for a QA professional looking to work at the intersection of fintech and AI, contributing to innovative payment solutions while advancing their career in a supportive, technology-driven environment.

QA Engineer position at Merpay, focusing on AI-driven testing solutions and quality assurance for fintech products, requiring 3+ years of experience and strong technical skills.

Software Engineer, QA - Merpay

A technology company operating a marketplace app that facilitates the circulation of value through C2C commerce.

Mercari is seeking a Corporate IT/Corporate Engineer specializing in IT Service Management to join their team in Tokyo. This role is part of the Corporate Engineering department, which operates under the mission of "Expanding Mercari's possibilities through technical capability and implementation power."

The IT Service Management (ITSM) team is responsible for managing and operating IT hardware and software used across the entire Mercari group. Their goal is to ensure all members can focus on their work comfortably and safely through daily support and operations. The team contributes to solving user issues and maintaining stable IT service operations.

This position offers unique challenges, including working in a rare environment that combines thousands of users with cloud and SaaS-native infrastructure. You'll have the opportunity to build and operate IT infrastructure that meets global standards and directly impact the company through IT service and asset management.

The role involves managing IT projects, overseeing the IT Service Desk team, handling escalated support issues, and managing budgets and contracts for hardware and software assets. You'll also support the engineering organization with AI/LLM tool management.

Mercari offers a flexible work environment with hybrid working options and no core hours. The company values diversity and inclusion, ensuring equal opportunities regardless of background. They're looking for someone who can embrace change and evolution, prioritize user experience, and balance idealism with practicality.

The position requires Japanese language proficiency and preferably English language skills, as you'll be working in a global environment with English-speaking colleagues. Experience with enterprise systems, IT support, and stakeholder management is essential for success in this role.

Corporate IT/Engineering role at Mercari focusing on IT Service Management, requiring 3+ years of experience and strong Japanese language skills.

Corporate IT/Corporate Engineer, IT Service Management

Mercari, a leading marketplace app company, is seeking a Software Engineer specializing in Cloud Networking to join their team in Tokyo. The role is part of the Networking Platform Team, which is crucial in making communication between customers and systems smooth, reliable, and secure. The team manages the entire network infrastructure from CDN to physical data centers, utilizing modern technologies like Kubernetes and Istio service mesh.

The ideal candidate will be working on cutting-edge projects including service mesh implementation, Kubernetes cluster migration, and building cloud networking foundations for global scaling. This position offers a unique opportunity to work with large-scale systems and impact both developers and end users through end-to-end ownership of networking solutions.

The company culture is built on strong engineering principles including Passion For The Product, Grow Together, Solve Through Mechanisms, and Collaborate Openly. Mercari offers a flexible work environment with full flextime and no core hours, based in their Roppongi office.

This role requires a strong background in networking fundamentals, cloud platforms (GCP/AWS), and modern infrastructure tools. The successful candidate will be involved in critical projects like implementing service mesh, managing Kubernetes clusters, and establishing robust networking foundations for global scale operations.

Working at Mercari means joining a company with a clear mission to "Circulate all forms of value to unleash the potential in all people." The company values diversity and inclusion, ensuring equal opportunities for all candidates regardless of their background.

Senior Cloud Networking Engineer role at Mercari, focusing on building and maintaining robust cloud infrastructure and networking solutions for a global marketplace platform.

Software Engineer, Cloud Networking

A Japanese marketplace app company that enables value circulation through their C2C platform, with over 23 million monthly users.

Mercari is seeking a Backend Product Engineer for their Mercoin team, focusing on cryptocurrency and blockchain services. The role involves developing and maintaining the core backend systems for cryptocurrency trading and user management functions. The team is responsible for building Bitcoin trading services that already serve over 3 million customers, making it a significant player in an industry with approximately 10 million users total.

The position offers unique challenges, including the opportunity to provide new cryptocurrency-related features to Mercari's 23 million monthly active users. The team leverages distinctive advantages such as integration with Mercari's payment system and a verified user base of over 14 million customers. Working in a flexible environment with modern technology stack including Go, GCP, and various cloud services, you'll collaborate with product managers and trading teams to directly impact product growth.

The role requires strong technical expertise in web application development, database design, and microservices architecture. You'll be working with cutting-edge technologies like Protocol Buffers, gRPC, and various GCP services. The ideal candidate should have experience with high-traffic systems and a passion for cryptocurrency/blockchain technology.

This is an excellent opportunity for engineers interested in being at the forefront of financial technology innovation, working on large-scale systems that have real impact on millions of users. The position offers flexible working arrangements and the chance to work with a modern tech stack in a company that values engineering excellence and innovation.

Backend Product Engineer position at Mercari's Mercoin division, focusing on cryptocurrency trading systems and blockchain technology using Go and modern cloud infrastructure.

Mercari Engineering Jobs

Mercari is a Japanese e-commerce company operating a marketplace platform where users can buy and sell items.