Work Experience

Infrastructure Specialist / Kyndryl Japan Co., Ltd.Sep. 2021 - Present

LLM Chat Application with Gemini DevelopmentJun. 2024 - Aug. 2024

• Improved response generation by transitioning from a LangChain toolkit handling only structured-data queries to a hybrid logic that identifies general versus analytics requests.
• Reduced SQL generation errors by over 90% by developing a custom prompt template that filtered out unsupported syntax and ensured Gemini generated SQL fully compatible with BigQuery.

Python Application Workshop Development for InternalMay. 2025 - Oct. 2025

• Led a structured three-phase internal Python application workshop: (1) introduced REST API fundamentals, (2) advanced to GitHub API HTTP-method implementation and response data manipulation using session_state, and (3) applied the Microsoft Graph API to catalyze workflow automation for attendees’ business tasks.
• Conducted an 11-day pilot with 40 selected participants; 25 distinct users accessed the service (~63% uptake) so far, confirming high early demand and readiness for wider rollout.

Backend API Infrastructure DevelopmentJul. 2023 - Nov. 2025

• Configured rsyslog to handle dynamic Pod scaling (up to 3 Pods) and failover scenarios, ensuring robust log collection from Vector. This architecture supports future expansion to handle increased log volume and additional Kubernetes clusters.
• Developed a shell script to automate the generation of monthly uptime statistics by processing Prometheus-collected metrics, reducing manual report preparation time by 80%.

B2B Internet Banking System UpgradeJul. 2023 - Present

• Identified LDAP authentication SQL queries were performing 5–6 times slower than baseline; developed and implemented a Shell script to add necessary indexes and schedule daily statistics updates, resulting in roughly 80% improvement in query performance, restoring processing speeds to baseline levels.
• Developed a Shell script that automated the monthly password update process for DB users by securely handling inputs from the existing password issuance system, eliminating approximately 12 hours of manual work annually.
• Deployed resilient backup and restore strategies to ensure high reliability, collaborating with stakeholders to define data retention policies that comply with regulatory standards and align with organizational objectives.

IT Specialist / IBM Japan, Inc.Apr. 2021 - Sep. 2021

Migration of Large On-premises to IBM CloudJul. 2021 - Jun. 2023

• Automated some migration processes using Ansible and provided operational support for Linux and Windows Server.
• Diagnosed a network issue between Veeam and IBM Cloud Object Storage using tools like Wireshark and WinSCP. Optimized Veeam parameters, resulting in a fourfold increase in data transfer volume, thereby significantly enhancing backup efficiency.