Mainframe & Backend Developer

Bridging legacy architecture
with modern AI.

I specialize in core banking mainframes, intelligent automation, and robust backend architectures. By combining deep knowledge of core technologies like COBOL and Assembler with modern scripting and API integrations, I build systems that push the boundaries of financial infrastructure.

"I view AI as a force multiplier. Instead of spending hours writing syntax from scratch, I utilize advanced AI tools to handle foundational coding. This allows me to focus my energy on what matters most: high-level program planning, architectural logic, and ensuring the project aligns perfectly with business goals."

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Calvin Lee Portrait
Experience
Mar 2024 — Present

Maybank

Full Stack / Mainframe Developer

  • Core AI Integration: Acted as the primary technical tester for pushing generative AI usage directly inside core banking systems, ensuring secure operation and mitigating data risks via safe placeholder testing.
  • Internal Web Automation: Developed confidential daily monitoring dashboards utilizing HTML, JS, and PHP, currently used by over 200 employees to streamline operations and map mainframe-to-open-system logic flows.
  • Zero Defect Stability & Resiliency Award: Engineered an automated monitoring system that successfully reduced the time required to diagnose internal program slowness from a 2-day manual process down to under 1 hour.
  • 2026 Performance Recognition: Awarded an exceptional 3.5-month performance bonus, significantly exceeding the standard target cap for the cohort tier based on top-rated year-end deliverables.
    • Click to view award
Mar 2023 — Mar 2024

Maybank

Mainframe Developer

  • Banking Automation & SAFE: Implemented Savings Related Projects (SAFE), managing critical mainframe functions to validate high-volume transaction conditions and ensure system stability using Assembler and COBOL.
  • Preventative Failure Analysis: Developed on request of Bank Negara & Audited By PWC to track internal system health for daily info, large quantity of data processed in house and to be converted to readable data. (Full Stack Development)
Education

The University of Queensland

BE, Information Technology (2021 — 2022)

QS World University Rankings: #46 Globally (2021)

HELP University

Bachelor's degree, Information Technology (2018 — 2020)

Selected Work
Personal Projects

Creative AI & Architecture

Melo Studio

A creative side project involving the use of AI to compose, produce, and generate music entirely from scratch.

Direct API LLM Integration

Implementing raw capabilities from models like Llama, Deepseek, Kimi, and Qwen directly into custom applications:

Interactive Games

Custom Web Games

Interactive browser-based projects built to experiment with multiplayer sockets and rendering mechanics:

  • An Imposter Game (Multiplayer) A multiplayer web game built for real-time player interaction and communication.
  • Slice A web-based game project focused on precise timing and quick mechanics.
Tech Stack

Primary Focus

JCL COBOL Assembler SQL

Additional Experience

Node.js Python PHP JavaScript HTML/CSS MongoDB
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