Role Description As a Platform Engineer, you will own and evolve key parts of our Cloud Native stack — including: - Kubernetes - Istio - The Grafana observability suite - ArgoCD - Terraform - GCP-native services You will research emerging technologies, make the case for adoption, and partner closely with development teams to support new and existing platform initiatives. We think about our systems across two dimensions: - Pillars (technical ownership areas) - Network — service mesh, ingress, DNS, connectivity - Observability — metrics, logging, tracing, alerting - Data Store — managed databases, caching, storage - Environment Management — cluster lifecycle, provisioning, multi-tenancy - Automation — CI/CD, GitOps, self-service tooling - Purpose (the lens we apply to every pillar) - Security - Reliability - Cost Efficiency - Developer Experience - Open Source Contribution You'll have room to develop a specialism, but the nature of platform work means you'll regularly cross all five pillars. Expect both depth and breadth. Qualifications - Japanese and English — Strong written and spoken proficiency in both languages is required for day-to-day collaboration and documentation. - Kubernetes — Hands-on experience operating Kubernetes clusters in production (self-managed or managed service). - GCP — Demonstrated experience operating workloads on Google Cloud Platform. - Terraform — Infrastructure-as-Code experience with Terraform and strong GitOps practices. - GitHub — Comfortable with GitHub-based workflows, including Actions, branch strategies, and pull-request-driven operations. - Cloud Native fundamentals — Solid understanding of Cloud Native patterns: containerisation, service discovery, secrets management, and declarative configuration. - Security awareness — Familiarity with information security fundamentals: secure development lifecycle, threat modeling, and security practices in public cloud environments. Requirements - SRE experience — Background in site reliability engineering: SLOs, error budgets, incident management, and post-mortem culture. - AWS — Experience with AWS as a secondary cloud provider. - Platform tooling: - ArgoCD or another GitOps continuous delivery tool - Istio or another service mesh - Grafana, Prometheus, Loki, or Tempo for observability - Datastore operations — Experience managing databases, caches, or object storage in cloud or on-prem environments. - Networking — Experience with on-premises or cloud networking: VPNs, firewalls, load balancers, BGP. - Coding skills — Go, Python, or Bash for automation, tooling, and glue code. - PCI-DSS — Familiarity with operating regulated workloads under PCI-DSS. - Open-source contributions — Prior contributions to open-source projects, technical or community. Company Description UPSIDER is a Tokyo-based fintech company on a mission to build a global financial platform for challengers — the startups and fast-moving businesses driving Japan's next wave of economic growth. We offer two core products: - UPSIDER, a corporate card built for scale - Shiharai.com, a business payment solution designed to simplify how companies manage spend Since launching, we have grown to serve over 100,000 companies across Japan, with cumulative transaction volume surpassing ¥1 trillion. Backed by global investors including DST Global and Tencent, and operating as part of the Mizuho group, we combine the ambition of a startup with the credibility of one of Japan's leading financial institutions.

• Contribute to the development of cutting-edge platforms that serve the needs of the Studio across various cloud providers and data centers • Responsible for developing the compute, storage, database and platform solutions on prem and in the public cloud • Collaborate within a cross-functional team to design and implement next-generation CI/CD platforms-as-a-service for internal product solutions • Leverage Kubernetes operators and Spinnaker pipelines to automate application deployments and administration across multiple environments (on-premises and in the cloud) • Define and implement workflows, processes, and standards for Infrastructure-as-Code (IaC) • Demonstrate a strong understanding and contribute to the continuous improvement of the studio platform, including in-house DevOps tools and custom products used for platform operations • Integrate chaos engineering practices and support the development of full-stack, continuous testing environments to improve system reliability and resilience • Continuously monitor system health, capacity, and performance indicators, driving optimization and proactive improvements • Provide tier-3 on-call support for troubleshooting and break-fix support for production services • Actively drive and participate in the team’s continuous improvement initiatives • Monitor and maintain platform infrastructure, utilizing tools like Datadog for performance tracking, alerts, and capacity management

• Own technical support and operational readiness for the contact center technology stack, including Amazon Connect, Kustomer, and any related AWS services, integrations, or tooling used by the contact center • Serve as the primary technical owner for contact center platform reliability, supportability, observability, and incident response • Configure, maintain, and troubleshoot Amazon Connect components, including contact flows, routing profiles, queues, hours of operation, prompts, numbers, agent experience, and related platform settings • Configure, maintain, and troubleshoot Kustomer, including users, teams, queues, routing rules, workflows, business rules, integrations, reporting, and the agent experience • Partner with Customer Service and eCommerce leadership to support business requirements for call routing, IVR behavior, agent workflows, reporting needs, and operational changes • Support integrations across the contact center stack, including Amazon Connect, Kustomer, order management, customer data, analytics, workforce management, identity, telephony, and reporting platforms • Establish and maintain platform monitoring, alerting, dashboards, logs, runbooks, escalation procedures, and operational documentation • Own production support processes, including issue triage, root cause analysis, post-incident reviews, change control, and release coordination • Partner with Security and Infrastructure teams to ensure appropriate access controls, IAM policies, encryption, audit logging, compliance posture, and data handling practices • Work with AWS, implementation partners, and internal teams to resolve platform issues and manage vendor escalations • Support disaster recovery, business continuity, failover planning, and platform resiliency testing for contact center operations • Drive automation and infrastructure-as-code practices where appropriate for repeatable configuration, deployment, and environment management • Translate technical platform limitations, risks, and support needs into clear communication for business and technology stakeholders • Stay current with Amazon Connect, Kustomer, AWS contact center services, AI/automation capabilities, and cloud contact center best practices.

• Own technical support and operational readiness for the contact center technology stack, including Amazon Connect, Kustomer, and any related AWS services, integrations, or tooling used by the contact center. • Serve as the primary technical owner for contact center platform reliability, supportability, observability, and incident response. • Configure, maintain, and troubleshoot Amazon Connect components, including contact flows, routing profiles, queues, hours of operation, prompts, numbers, agent experience, and related platform settings. • Configure, maintain, and troubleshoot Kustomer, including users, teams, queues, routing rules, workflows, business rules, integrations, reporting, and the agent experience. • Partner with Customer Service and eCommerce leadership to support business requirements for call routing, IVR behavior, agent workflows, reporting needs, and operational changes. • Support integrations across the contact center stack, including Amazon Connect, Kustomer, order management, customer data, analytics, workforce management, identity, telephony, and reporting platforms. • Establish and maintain platform monitoring, alerting, dashboards, logs, runbooks, escalation procedures, and operational documentation. • Own production support processes, including issue triage, root cause analysis, post-incident reviews, change control, and release coordination. • Partner with Security and Infrastructure teams to ensure appropriate access controls, IAM policies, encryption, audit logging, compliance posture, and data handling practices. • Work with AWS, implementation partners, and internal teams to resolve platform issues and manage vendor escalations. • Support disaster recovery, business continuity, failover planning, and platform resiliency testing for contact center operations. • Drive automation and infrastructure-as-code practices where appropriate for repeatable configuration, deployment, and environment management. • Translate technical platform limitations, risks, and support needs into clear communication for business and technology stakeholders. • Stay current with Amazon Connect, Kustomer, AWS contact center services, AI/automation capabilities, and cloud contact center best practices.