Full-stack payments by day · multi-agent LLM systems by night

Hi, I'm Kelvin You
AI-native Full-stack Engineer · Fintech Payments & Agent Systems

0+Years Exp.
0+Projects

About Me

Learn more about my journey and what drives me as a developer

Start with a messy, ambiguous problem

Design it into a system, not a patch

Ship it so it runs on its own

How I Work

I chase the pattern under a mess — an ambiguous problem, a slow system, a manual workflow — and turn it into something that runs on its own.

Currently Building

A multi-agent stock-analysis pipeline on the Claude Agent SDK — four analyst agents, a debate stage, and an outcome-memory loop that scores its own past calls.

TypeScriptNext.jsReactPythonClaude Agent SDKMCPFastAPIPostgreSQL

Skills & Expertise

The stack I actually build with — day job, side projects, and everything in between.

Tech Stack

  • React
  • React Native
  • TypeScript
  • Next.js
  • Node.js
  • Kotlin
  • Python
  • Java
  • Go

AI / Agents

  • LLM Integration (Claude API)
  • Agentic AI
  • Multi-agent Systems
  • MCP (Model Context Protocol)
  • Prompt Engineering
  • AI-assisted Development

Data

  • PostgreSQL
  • Supabase
  • Redis

Cloud & Delivery

  • Docker
  • GitHub Actions (CI/CD)
  • Vercel
  • Firebase

Tools

  • Claude Code
  • Git
  • Playwright

Projects

Each one with the measured result it produced — and an honest blank where there isn't one.

Agentic systems2026

Multi-Agent Stock Analysis

Four analyst desks — fundamentals, technical, sentiment, macro — each on its own MCP server, argued through a debate stage and merged by a synthesizer. Signals are validated walk-forward against a frozen holdout, with Wilson intervals and a deflated Sharpe on the strategy search — which is how I know the factor still lagged buy-and-hold.

Python · Claude Agent SDK · MCP · Multi-agent Systems · Walk-forward Backtesting · Pydantic · FastAPI

1.32
Sharpe on a frozen 2023-26 holdout, net of cost
10/12
tickers still net-positive at 30 bps/side
Source

2026

Personal-OS

Guardrail design over raw model output. Only an acute bad-sleep night is non-overridable; on the noisier 7-day trend, live HRV overrides the automated deload — so it catches real risk without crying wolf every week on a lagging metric.

Claude Code · MCP · LLM Integration · Multi-agent Systems · Python · TypeScript · Agent Skills

12
agent skills running on a weekly cadence
1
non-overridable rule; the rest defer to live HRV
Source

2025

PTIB

Multi-tenant SaaS that digitised a 200-student tuition centre: role-based portals, Stripe billing, QR attendance, row-level security in Supabase.

Next.js · TailwindCSS · Supabase · PostgreSQL · Stripe · Shadcn · React

$500
MRR from 3 pilot centres
5 hrs
of admin saved per week
Demo
All 7 projects

Experience

From production fintech platforms to agentic systems I build on my own time.

DTCPay (FinTech)

Frontend Engineer

DTCPay (FinTech)·Kuala Lumpur, Malaysia
Full-timeJul 2025 - Present

Production payments platform, 9,000+ users. Led Flutter to React Native migration unifying mobile + web.

  • Kotlin backend for cross-currency batch payments: FX quote lock, largest-remainder allocation, CAS-on-status duplicate guard.
  • Fail-closed PII masking across 5 payment surfaces — unmask only on explicit corporate classification.
  • KYT case review UI: maker-checker approval workflow, RFI state machine, scope-gated decisions.
KotlinReactReact NativeTypeScriptPayment SystemsConcurrencySystem DesignFintech
Simpletruss

Frontend Engineer

Simpletruss·Kuala Lumpur, Malaysia
Full-timeJun 2024 - Jul 2025

Building enterprise property management SaaS. 500+ properties, 10K+ maintenance tickets monthly.

  • Component library with compound patterns, TypeScript generics, Storybook docs. 40% faster dev velocity, 60KB bundle reduction.
  • GraphQL layer: Apollo Client, 80% cache hit rate, custom hooks (usePaginatedQuery, useOptimisticMutation). Type-safe, zero prop-drilling.
  • Performance: Code splitting, virtualization for 10K+ rows, Zustand over Redux. 35% faster initial loads.
ReactTypeScriptGraphQLApollo ClientZustandMaterial UIStorybook

Key Projects

LessenPro

Scheduling engine, vendor coordination, maintenance tracking. 500+ properties managed.

ReactTypeScriptGraphQLMaterial UIApollo Client
Beyondsoft (Tencent)

Frontend Developer

Beyondsoft (Tencent)·Kuala Lumpur, Malaysia
Full-timeJul 2023 - Jun 2024

Analytics platform for Tencent, MiHoYo (Genshin Impact), major game studios. Millions of events/day.

  • Performance: Virtual scrolling (500K rows), Web Workers for parsing, debounced filters. Sub-3s loads at 60fps.
  • Quality: Jest standards, mandatory reviews, 40% fewer production bugs. Docker dev env: 4h → 30min onboarding.
  • Cross-team: Specs with Tencent engineers, cross-browser (Safari, IE11), China CDN optimization.
ReactTypeScriptReduxAnt DesignJestDockerWebpackGo

Key Projects

Databrain Global

Real-time player analytics. 100K+ row datasets, complex filters, interactive dashboards.

ReactUmi.jsAnt DesignTypeScriptGo
Finexus (Fintech)

Java Engineer Intern

Finexus (Fintech)·Kuala Lumpur, Malaysia
InternshipFeb 2023 - Jul 2023

First exposure to fintech production payment systems — legacy Java/JSP monolith, thousands of daily transactions. Foundation for current fintech work at dtcpay.

  • Fixed connection pool bug causing peak-hour failures. HikariCP + JMX monitoring → 99.9% uptime.
  • Deployment automation: Bash scripts for Tomcat WAR deploys. 4h → 2h per release.
  • Jasper Reports: Query optimization, indexing. 8s → 1.2s report generation.
JavaOracle SQLServletsJSPTomcatShell ScriptingJasper Reports
Techtics (Web3)

Blockchain Engineer Intern

Techtics (Web3)·Kuala Lumpur, Malaysia
InternshipOct 2020 - Jan 2021

Ethereum dApp during 2020 DeFi boom. Smart contracts, gas optimization, MetaMask.

  • Solidity contracts: Reentrancy guards, gas estimation UI, MetaMask signing. Deployed to mainnet.
  • Gas optimization: IPFS storage, batched transactions. 65K → 38K gas (40% savings).
ReactTypeScriptSolidityMetaMaskNode.jsExpressRedux

Education

My academic journey in computer science and software engineering.

Bachelor of Software Engineering (Honours)

Tunku Abdul Rahman University of Management and TechnologyKuala Lumpur, MalaysiaJun 2021 - Jul 2023

Specialized in distributed systems, parallel computing, and performance optimization. Built 15+ projects ranging from blockchain dApps to mobile applications. Core coursework: Data Structures & Algorithms (Java), Distributed Systems, Parallel Computing, Human-Computer Interaction, Graphics Programming. Electives: Mobile Development (Flutter), Blockchain Development (Solidity), Data Science (Python).

Achievements & Honors

  • Dean's List (Top 10% - GPA: 3.72/4.0)
  • Final Year Project: Travel Guide App presented to 50+ industry professionals
  • Secured Databrain Global (Beyondsoft) internship through university recommendation
  • Led student team of 4 for final year capstone project
Tunku Abdul Rahman University of Management and TechnologyView certificate

Diploma in Computer Science

Tunku Abdul Rahman University of Management and TechnologyKuala Lumpur, MalaysiaMay 2019 - May 2021

Basic Programming Concepts through various languages such as Object-Oriented Programming in Java, C, and Assembly Language. Mathematics courses included Algebra, Calculus, Statistics, Discrete Math.

Tunku Abdul Rahman University of Management and Technology
Kuala Lumpur · GMT+8Replies within a dayOpen to conversations

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Hi Kelvin — we're hiring a full-stack engineer and your payments work looks like a fit. Here's the team and the scope —

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