Infrastructure Engineer

Focus: Cloud Infrastructure · IaC · CI/CD · Observability · Reliability Languages: Japanese required (business level); business-level English or Mandarin also required

About the role

We are looking for an Infrastructure Engineer who is excited about building reliable, scalable systems that support fast-moving AI products. You will own the infrastructure behind Anini and gazai.ai, with a focus on reliability, cost efficiency, and developer velocity — working closely with Tokyo HQ and staying at the forefront of AI product trends.

Responsibilities

• Own cloud infrastructure and IaC: Terraform, environments, and day-to-day operations across our stack (AWS/GCP, Kubernetes/ArgoCD, databases)
• Improve developer velocity and delivery: CI/CD optimization (caching, concurrency, reusable workflows), release reliability, and cloud cost efficiency
• Build and maintain production observability (monitoring, alerting, logs, tracing) and use it to drive performance and scalability work (latency, worker capacity, DB connection limits, load testing)
• Improve reliability and correctness of production systems: incident response, root-cause analysis, postmortems, and pragmatic data verification checks such as quota and audit consistency
• Own production incident response for infrastructure-related issues: rapid triage, mitigation, and postmortems with clear follow-ups
• Improve developer experience for local and staging environments (e.g. Docker Compose-based local env, environment parity, safe debug tooling)
• Maintain internal runbooks and setup documentation so the team can operate confidently across access, dashboards, and common debugging workflows

Qualifications

• 5+ years of experience in infrastructure, DevOps, SRE, or platform engineering roles
• Hands-on experience shipping changes safely to production
• Strong fundamentals in Linux, networking, and cloud systems (AWS and/or GCP)
• Experience operating containerized workloads (Kubernetes preferred) and continuous delivery tooling (e.g. ArgoCD)
• Experience with monitoring and observability tools (Grafana, Sentry, logs/traces) and building actionable alerts
• Comfortable debugging production issues end-to-end — from user symptoms to infrastructure root causes
• Experience with CI/CD systems (GitHub Actions preferred) and optimizing pipelines for speed and reliability
• Good engineering hygiene: documentation, runbooks, and operational checklists
• Business-level Japanese; business-level English or Mandarin also required

Bonus — you will stand out if…

• You have experience with data pipelines or operational analytics (e.g. Pub/Sub, BigQuery, scheduled verification scripts) and treat data quality as part of system reliability
• You have experience supporting AI model serving infrastructure: GPU/CPU workload scheduling, inference pipeline optimization, and reliability of model endpoints under variable, bursty load
• You have familiarity with security and compliance practices: secrets management (e.g. Vault, AWS Secrets Manager), least-privilege access controls, and container/dependency vulnerability scanning
• You have experience owning cloud cost visibility: spend dashboards, budget alerting, and instance rightsizing
• You are comfortable with on-call responsibilities and uptime ownership, and have contributed to SLA/SLO frameworks
• You have experience managing staging and sandbox environments for AI model testing, enabling safe validation of new model versions before production rollout