Building thoughtful digital experiences

Hi,
I'm Paul Sin.
Creating AI-Driven Systems and Full-Stack Experiences that think, adapt, and scale.

I blend full-stack engineering with AI agent development, shipping products that automate workflows and elevate user experience from the inside out.

Experience
Front-end and UI&UX Design
Recent focus
AI Agent & AI-assisted UX
Based in
San Mateo & remote-friendly
Profile of Paul Sin
Currently open for select collaborations

Featured work

Projects that blend AI agents with full-stack craft

Grid-based layout fits six+ case studies, with hover/focus details and consistent mobile treatment.

AI Agent · LangGraph
2025

YOUTUBE THUMBNAIL MAKER

LangGraph-powered agent that turns YouTube scripts into on-brand thumbnail concepts in a few clicks.

LangGraph orchestration Vision workflow Brand-safe output

The agent generates multiple thumbnail options, scores them with a small eval loop, and then returns the top pick with title, layout notes, and prompt references so designers or other tools can ship assets consistently.

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AI Agent · Google ADK
2025

YOUTUBE SHORT MAKER

Agent that slices long-form videos into short clips, writes hooks, and prepares upload-ready metadata.

Clip detection Hook generation Auto metadata

Pipeline parses the transcript, ranks highlight moments, drafts titles and descriptions, and suggests music or sound effects so creators can push Shorts faster with less manual editing.

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AI Agent · LangGraph
2025

CUSTOMER SERVICE AGENT

Tier-1 support agent that understands FAQs, pulls answers from docs, and knows when to hand off to humans.

Intent routing RAG Safe escalation

The graph classifies each message, retrieves the right policy or FAQ content, drafts a response, and escalates tricky cases with a clean summary so human agents can jump in without re-reading the whole thread.

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AI Agent · OpenAI
2025

FINANCE SUPPORT AGENT

Internal agent that triages finance requests, drafts replies, and keeps Notion and Slack in sync.

OpenAI SDK API integrations Stock market

The flow reads incoming tickets, detects the type of request, fills a brief with key details, and posts updates to Slack and Notion so PMs and stakeholders always see the latest status without asking.

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Workflow · LangGraph
2025

WORKFLOW AUTOMATOR

Backend-first automation hub that runs approvals, data enrichment, and alerts on top of FastAPI.

FastAPI backend Webhooks Event pipeline

Webhook events drop into a LangGraph workflow that cleans data, calls external APIs, requests approvals, and ships notifications. Logs and simple metrics help debug runs and keep an eye on failures.

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AI Agent · CrewAI
2025

Job-Hunter AGENT

Job search copilot that finds roles, tailors resumes, and tracks applications in one place.

Multi-agent flow Profile memory Job matching

Agents work together to read the user’s profile, search job boards, suggest matches, and draft customized resumes and emails. A lightweight memory layer remembers preferences like tech stack, location, and salary range.

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About me

Engineer blending full-stack development with AI agents

I love building automated systems with AI agents. I'm deeply interested in agentic AI creating agents that think, adapt, and reduce human workload. I've built several agents that automate repetitive tasks, optimize workflows, and help users get things done with less effort. As a solo developer, I can take an idea from zero to launch: designing the interface, engineering the backend, and building the AI agents that power the entire experience. I'm driven by curiosity, speed, and the challenge of turning intelligence into practical tools.

  • AI agent: Financial support, Chat-bot, Job-Hunter,etc
  • Code-proficient: comfortable across HTML, CSS, Python, JS.
  • Collaborative:Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Toolbox

UX Research
Agent Orchestration
Python / FastAPI
Workflow Automation
AI Agent Development
AI Architecture
Product Thinking

Testimonials

“Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam semper dictum ligula, ut iaculis eros vehicula et. Donec venenatis rutrum ultrices.”

— From my friend

“Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam semper dictum ligula, ut iaculis eros vehicula et. Donec venenatis rutrum ultrices.”

— From my mom

Education

College of San Mateo — 2023 ~ present

Yeong Dong High School — 2016 ~ 2019

Professional opportunities

Let’s collaborate on AI-first products, systems, and launches

Open to employer roles, studio partnerships, and selective sponsorship/support for ambitious ideas.

How I can help

  • Ship AI agents that automate workflows across product, ops, and content.
  • Design+build full-stack experiences: UX, frontend, backend, data flows.
  • Stand up action graphs with testing, guardrails, and observability baked in.
  • Fractional support: audits, architecture reviews, velocity boosts.
Contract
Full-time
Collaboration

Sponsorship & support

Have a bold problem that needs hands-on help? I occasionally take on sponsored builds, pilots, or co-created experiments.

News & Blog

Latest spotlights, builds, and thinking

A mix of student spotlights, project milestones, and industry signals I'm tracking.

Student spotlight Jan 2025

Building a LangGraph agent that scores and rewrites thumbnails

Behind the scenes of the thumbnail maker: dataset curation, reward modeling, and QA feedback loops.

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Project update Dec 2025

Workflow Automator hits production with FastAPI and workers

Notes on scaling event-driven workers, tracing retries, and instrumenting metrics for ops teams.

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Industry insight Nov 2025

Design trends: memory-forward UX for AI copilots

Patterns for transparent memory, interruptible conversations, and scoped permissions across surfaces.

Read detail →