CAREER

Work Experience

5+ years building and operating mission-critical infrastructure across fintech and enterprise.

CAREER

Site Reliability Engineer

Nov 2024 – PresentJapan

▹Built an Azure Functions–driven data archival pipeline to migrate ~600 GB of high-growth tables from Azure SQL Business Critical to Hyperscale tier, relieving primary database capacity pressure, preventing the 4 TiB storage ceiling breach, and delivering $4,800/yr in sustained cost savings.
▹Deployed a unified observability stack—Datadog dashboards, Sentry error tracking, and Azure Monitor alerts—cutting incident detection time by 50% and driving sustained MTTR improvements in production.
▹Improved EFCore.BulkExtensions batch processing performance for 20M+ record workloads by introducing checkpointing, configurable batch sizing, and retry mechanisms—cutting end-to-end pipeline processing time by 35%.
▹Led .NET 8 runtime upgrades for all production Azure Functions, improving cold-start latency and execution efficiency by 25% while maintaining backward compatibility across dependent services.
▹Architected backend infrastructure for a full customer-facing platform redesign, designing Azure App Services topology with RBAC-enforced Key Vault and Storage Account access via Service Endpoints to enforce zero-trust service-to-service authentication across all APIs.

SRE & Cloud Engineer

Mar 2022 – Oct 2024Japan

▹Managed the full AKS cluster lifecycle—upgrades, capacity planning, workload identity, RBAC hygiene, and priority classes; migrated to newer VM SKUs and consolidated node pools, saving ~$12,960/yr in infrastructure costs across production and staging.
▹Developed Slack Bolt slash commands integrated with Jira to enable engineers to query tickets, create subtasks, and trigger release approvals without leaving Slack; reduced context-switching overhead and saved teams 5–7 hours per sprint, cutting approval cycle time by 40%.
▹Implemented multi-environment Terraform Cloud workflows integrated with Azure DevOps VCS pipelines; enforced standardized module structures and dynamic environment tagging, reducing configuration drift and increasing overall deployment frequency by ~27%.
▹Codified full AWS environment stacks—VPCs, NAT Gateways, ELB, security groups, IAM roles—in Terraform, cutting provisioning time to under 10 minutes and boosting deployment frequency by 27%.
▹Built and maintained CI/CD pipelines with AWS CodePipeline and CodeBuild; deployed containerized microservices to ECR and ECS using zero-downtime rolling update strategies across all environments.

Full Stack Engineer

Jan 2021 – Dec 2023Japan

▹Built and scaled a Vue.js SPA e-commerce platform handling 300M+ monthly visits, leading the frontend team through sprint planning, task allocation, and code reviews in an agile scrum environment.
▹Authored reusable Single File Components (SFC) with Pinia state management, improving maintainability and ensuring predictable, reactive behavior across all user flows at scale.
▹Deployed and operated resilient frontend microservices on AWS ECS with automated CI/CD pipelines and service-level auto-scaling policies, maintaining zero downtime across all production releases.
▹Built a .NET-based COBOL-to-Java automated migration tool; analyzed conversion gaps and implemented all missing logic to ensure complete output fidelity across migration runs.
▹Validated migration output by running converted Java applications against live mainframe results and authoring JUnit test suites to assert full output parity across all batch runs.