Joel Tan
Building digital experiences that matter.
I'm a software engineer passionate about building scalable web applications and intuitive user interfaces. I specialize in fullstack engineering, Generative AI pipelines, and modern cloud architecture.
Engineering at Scale
Automated test creation from 8,000 to 50 man-hours with GenAI at Visa Inc.
APAC Fintech Case Competition winner for new digital revenue proposals.
Vector embeddings and LLM architecture delivered to live stakeholders in 5 months.
CI/CD automated patch management pipelines for SMBC enterprise servers.
Lessons To Payment & Engineering Blog
Deep-dive technical writing breaking down complex domain knowledge—from payment processing protocols (ISO8583) and real-time fraud risk scoring to payment routing and hardware security.
Day 9: Message Routing (in Payments Network)
How payment messages navigate from terminal to acquirer, scheme switch, and issuing bank.
Day 8: EMV vs MagStripe
Understanding EMV microchip dynamic cryptograms, magnetic stripe skimming vulnerabilities, and the 2015 liability shift.
Day 7: Fraud Checks & Risk Scoring
Fraud detection in ISO8583 messages: Visa Advance Authorisation (VAA), Visa Risk Manager (VRM), and Mastercard Decision Intelligence.
Day 6: Data Element 4 & Data Element 7
DE4 Transaction Amount limits, currency smallest units, and DE7 Transmission Date & Time fraud detection.
Highlighted Projects
ESDeezknee
An immersive enterprise solution designed for theme parks to enhance visitor experiences. Features a microservices architecture handling ticketing, queues, and notifications.
Skill Issue (SBRP)
A Skill-Based Role Portal for internal corporate hiring. Enables staff to apply for roles based on skill compatibility and assists HR in candidate selection.
Core Technologies & Infrastructure
Every Drop
Saves a Life.
I built an automated tracker to monitor national blood stocks in real-time. Awareness is the first step to action.
National Blood Stocks
Data source: Red Cross Singapore (Scraped)