Work Experience - Nicholas Oh

Professional Experience

Visa, Singapore
May 2026 – Aug 2026

Conducted application vulnerability assessments on internal web apps and APIs as part of the Cyber Ethical Hacking team.
Identified and reported authentication, access-control, CORS, and LLM prompt-injection findings against Visa security standards.
Built an agentic retest pipeline that parses assessment reports into per-finding test plans and pre-loads Burp Suite Repeater requests, cutting manual retest setup time by about 60% across 5 findings.

Bank of America – Global Markets Technology (FICC), Singapore
Jan 2026 – May 2026

Contributed to backend services supporting fixed-income trading and risk workflows.
Improved application observability with structured logging and custom metrics, reducing mean time to detect and resolve incidents by 30%.
Refactored inefficient database queries and cached frequently accessed data, lowering p95 latency by 25% under peak trading load.

Uptale, Paris, France
Jul 2025 – Dec 2025

Built an end-to-end 360° depth visualization pipeline for a VR learning platform.
Spanned backend services, batch processing, and Unity VR runtime integration to enable depth-aware rendering for immersive scene exploration.

Central Provident Fund Board, Singapore
Aug 2024 – Dec 2024

Designed and implemented 12+ CI/CD pipelines in Azure DevOps, moving teams from bi-weekly to daily releases while maintaining a 98% production deployment success rate.
Engineered telemetry collection pipelines processing 500GB+ of application data daily, improving system reliability from 99.5% to 99.95%.
Co-led root cause analysis for a major service disruption and implemented permanent fixes that contributed to an 85% decrease in similar incidents.

Leong Lee International Limited, Vietnam
May 2024 – Aug 2024

Developed an API-as-a-Service product handling 10,000+ monthly API requests with AWS API Gateway, Lambda, RDS PostgreSQL, and 99.9% uptime.
Implemented AWS Cognito authentication and authorization for 500+ active users.
Automated API monitoring and logging with CloudWatch, reducing issue resolution time by 50%.

G Element, Singapore
Aug 2023 – Jan 2024

Developed and maintained full-stack web features with Vue.js, Express.js, Node.js, and PostgreSQL.
Collaborated across frontend and backend layers in agile sprint planning, implementation, and code review cycles.

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