About
Jumpei Ueno (Jun) — Senior Cloud Infrastructure Engineer, independent contractor (業務委託). Japan (currently in Thailand, GMT+7). Available for roughly 60–80 hours per month of additional engagement, async-friendly.
What I do
- Own AWS / GCP production infrastructure end-to-end across multiple accounts.
- Cloud cost optimization (FinOps): ~30% reduction baseline, 40%+ on at least one account, reported weekly to the CEO / CTO / CFO.
- SRE: SLI/SLO design and operations, incident response, postmortems.
- CI/CD specialization: GitLab CI/CD and GitHub Actions; IaC with Terraform, Ansible, CloudFormation.
- AI-augmented operations: Claude Code in production infra (sandboxed IAM, read-only users, internal governance).
Selected experience
- Sole CI/CD owner for a major Japanese megabank's web platform at Deloitte (Next.js + Sitecore on AWS ECS, GitLab CI/CD).
- Connected-vehicle ETL pipelines on GCP Dataflow with Java / Apache Beam (throughput +60%).
- EC2 → ECS Fargate migration delivering ~30% server-cost reduction.
- DDoS mitigation 3× including SYN-flood, root-cause analysis through WAF deployment.
Patent
U.S. patent application — a 0-RTT VPN handshake design. Filed March 2026, sole inventor, under examination.