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 2023 — Present

Maybank

Mainframe Developer

Developing in Assembler and COBOL. Responsible for implementing core banking functions and validating high-volume transaction conditions within critical financial environments.

Mar 2023 — Mar 2024

Maybank

Back End Developer

Focused on internal automation, scripting, and backend system optimizations prior to transitioning fully to the core mainframe architecture.

Education

The University of Queensland

BE, Information Technology (2020 — 2021)

QS World University Rankings: #46 Globally (2021)

HELP University

Bachelor's degree, Information Technology (2018 — 2021)

Selected Work

Core Infrastructure Work

Banking Automation & SAFE

Implemented Savings Related Projects (SAFE), a critical mainframe function where the vast majority of banking transactions route through, ensuring strict condition validation and system stability.

Core AI Implementation

Acted as the primary technical tester for pushing AI usage directly inside core banking systems, ensuring secure and efficient operation of new generative technologies.

Internal Web Automation

Developed confidential daily monitoring websites utilizing Node.js, Python, and PHP. These tools are currently registered to and utilized by over 200 employees daily to streamline operations.

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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