SWE, Autonomous Cloud Network

Job Overview

SWE, Autonomous Cloud Network - DC Infrastructure (On-Prem) - Mercari
Employment Status: Contract
Work Hours: Full Flextime (no core time)
Office: Roppongi

About Mercari

Circulate all forms of value to unleash the potential in all people
\"What can I do to help society thrive with the finite resources we have?\" The Mercari marketplace app was born in 2013 out of this thought by our founder Shintaro Yamada as he traveled the world. We believe that by circulating all forms of value, not just physical things and money, we can create opportunities for anyone to realize their dreams and contribute to society and the people around them. Mercari aims to use technology to connect people all over the world and create a world where anyone can unleash their potential. For more information about Mercari Group's mission, see Mercari's Culture Doc.

Organization/Team Mission

Mercari Engineering Principles are a shared understanding that serves as the foundation of engineering beliefs and behavior at Mercari. The Engineering Principles are designed to complement the organizational identity (Mercari's mission, values, and culture) from an engineering viewpoint. These principles ultimately help us achieve Mercari's mission by defining the ideal state we seek to realize in the long term.

Work Responsibilities

• Design, build, and operate Mercari's on-prem DC/GPU infrastructure, including data-center facilities (racks, power, cooling) and the supporting network


• Design and build the network foundation for GPU workloads: compute fabric (InfiniBand/RoCE), storage/in-band, service network, and isolated OOB management


• Design, configure, and operate routing for the on-prem GPU fabric and its cloud/platform interconnects using BGP (and OSPF/IS-IS, VLAN/VRF as needed), including ASN planning, route summarization, and routing policy


• Coordinate with data-center providers and SI partners on facility readiness, equipment procurement, lead times, and remote-hands/installation work


• Manage Mercari's internal data center end to end, including vendor/SI discussions, commercial negotiations, and contract & procurement handling


• Perform hands-on, on-site data-center networking work — running and changing cabling, and configuring routers, switches, firewalls, and other network devices (this role requires regular physical visits to our data center)


• Integrate the on-prem DC/GPU environment securely with existing corporate, cloud (GCP/AWS), and platform networks


• Establish monitoring, alerting, logging, and operational handoff for GPU systems and network devices


• Support GPU PoC execution and help define the path from PoC to production


• Automate provisioning and operations, and manage configuration as code (IaC)


• Collaborate closely with the Corporate IT team on data-center facilities, connectivity, and on-site operations (this collaboration is required for the role)


• Collaborate with ML Platform, Infrastructure, Security, and Procurement stakeholders

Unique Challenges

Stand up Mercari's first on-premises GPU infrastructure largely from the ground up, owning facility, network, and operational readiness end to end
Bridge cloud-native networking practices with traditional data-center and on-prem operations
Work with high-density compute systems (e.g., DGX B200-class) and high-speed fabrics (e.g., 400G InfiniBand/RoCE)
Make pragmatic decisions under evolving requirements and procurement timelines, while keeping the management plane isolated and the environment secure and supportable

Required Qualifications

Required Experience/Skills
Strong networking fundamentals (TCP/IP, IP address management, OSI layers 2–7, routing, DNS, TLS, HTTP)
Hands-on experience designing, configuring, and troubleshooting data-center routing and switching, especially BGP (ASN planning, route summarization, and routing policy), as well as OSPF, VLAN/VRF
Hands-on experience designing and operating physical/data-center networking (switches, routers, firewalls, structured cabling)
Production experience operating Linux servers
Hands-on data-center experience, including for GPU/high-density systems: physically installing and changing cabling and configuring routers, switches, and firewalls on-site (this role requires regular in-person visits to our data center)
Experience with data-center operations: racks, power, cooling, cross-connects, and coordinating remote-hands / installation work
Experience managing data-center vendors and SI partners, including commercial discussions and contract/procurement handling
Experience integrating on-prem and cloud networks (GCP or AWS), including VPN, proxies, and routing
Ability to automate workflows using Python