01
Handy
Automated tax refund and deduction diagnostic workflow for US gig workers.Compressed a 12-hour manual tax preparation process into a 1-minute automated flow.
CTR 11.48% / CPC $0.39 (Top 3% Techstars shortlist)2024.05 – 2025.05
hand-axe / archive
HAND-AXE
Structuring early-stage product and operational problems through AI, automation, experiment design, and evaluation systems.GTM Strategy & Product Lead with track record in SaaS growth, experiment-driven decision making, and B2B pipeline optimization. Built AI chatbots, B2B SaaS products, and consumer brands from 0 to 1. Expertise in ICP segmentation, PLG+Sales motion design, and data-driven experimentation.
Positioning
I turn early product and operational ambiguity into structured decisions through experiments, automation, and evaluation systems.Focused on 0→1 product strategy, AI workflows, and measurable validation loops.
Page Scope
This is the master portfolio index for hand-axe.This archive anchors product, AI workflow, internal tool, and brand system case studies.
Filter / Category
Selected Evidence
02
Looproof
Structured reference-check SaaS turning subjective peer feedback into comparable hiring signals.Generated 2,000+ B2B leads and secured an official cooperation letter from NICE Information Service.
2,000+ B2B leads / NICE official cooperation letter2024.11 – 2025.06
03
Monthly Hansu
Reframed fine dining as a recurring monthly cultural content series and automated end-to-end operations.Sold out for 3 consecutive months with a 10% operating margin and 90% reduction in manual ops time.
Sold out 3 consecutive months / 10% operating margin2023.06 – 2023.11
| No. | Year | Title | Description | Category | Outcome |
|---|---|---|---|---|---|
| 01 | 2026 | AMA — Artist Management AgentDesktop agent for artist activity-proof submission preparation | A desktop agent that helps artists collect, review, and organize activity evidence before preparing an official submission.A desktop agent for collecting, reviewing, and organizing artist activity evidence before submission. | AI Product, Artist Tools, Workflow Automation | Built & archived |
| 02 | 2024 | HandyAutomated Tax Refund Service for US Gig Workers | Automated tax refund and deduction diagnostic workflow for US gig workers.Compressed a 12-hour manual tax preparation process into a 1-minute automated flow. | Product, Fintech, TaxTech | CTR 11.48% / CPC $0.39 (Top 3% Techstars shortlist)2024.05 – 2025.05 |
| 03 | 2025 | LooproofData-Driven Reference Check SaaS | Structured reference-check SaaS turning subjective peer feedback into comparable hiring signals.Generated 2,000+ B2B leads and secured an official cooperation letter from NICE Information Service. | Product, B2B SaaS, HRTech | 2,000+ B2B leads / NICE official cooperation letter2024.11 – 2025.06 |
| 04 | 2023 | Monthly HansuF&B Brand Experience & Operations Automation | Reframed fine dining as a recurring monthly cultural content series and automated end-to-end operations.Sold out for 3 consecutive months with a 10% operating margin and 90% reduction in manual ops time. | Brand & Experience, F&B, Operations Automation | Sold out 3 consecutive months / 10% operating margin2023.06 – 2023.11 |
| 05 | 2023 | Korean PDF Grammar CheckerLayout-Preserving PDF Proofreading SaaS (V2 Web & V3 Apps in Toss) | Expanding a Korean PDF grammar checker SaaS from a V2 web service to a V3 Apps in Toss release.Reached 1,500 MAU on V2 web and launched V3 ad-monetized mini-app in Apps in Toss. | Product, B2C SaaS, Document AI | V2 MAU 1,500 / V3 ad monetization live2023.04 – Present (V2/V3 in 2025.10) |
| 06 | 2023 | MRELTask Lighting Hardware Brand for Deep Focus | Translated short-wavelength LED hardware technology into a brand for deep focus and cognitive immersion.Selected for a KRW 5M government-funded startup program and completed a working hardware prototype. | Brand & Experience, Hardware, Brand Strategy | KRW 5M government grant / Working prototype completed2023.03 – 2023.10 |
| 07 | 2024 | Gov-Program Lead Crawler & Cold Email EngineAutomated B2B Lead Collection & Personalized Outbound Pipeline | Automated lead collection and personalized cold-email pipeline targeting government startup program cohorts.Reduced manual B2B lead research and outreach preparation time by 95%. | Internal Tool, Operations Automation, B2B Outbound | 95% reduction in manual lead research & outreach time2024.11 – 2024.12 |
| 08 | 2023 | Bulyang Kitty CircleAI-Native Fashion Brand & Inventory-Light Hybrid Operations | Built an AI-assisted subculture fashion brand paired with an inventory-light hybrid fulfillment model.Reached KRW 10M in monthly revenue with offline market sell-outs and a 0% inventory disposal rate. | Brand & Experience, Fashion, AI Workflow | KRW 10M monthly revenue / 0% inventory disposal rate2023.12 – 2024.04 |
| 09 | 2024 | Personal HR SystemGoal-Aligned Daily Execution & Evaluation System in Notion | Designed a personal OKR, daily execution, and retrospective HR system in Notion and commercialized it as a template.Validated organic market demand by selling 30+ paid templates within 2 weeks of launch. | Lab, Productivity System, Notion | 30+ paid copies sold in 2 weeks2024.01 – 2024.02 |
| 10 | 2024 | CS Chatbot for a Performance Marketing CompanyHybrid RAG ON/OFF & o1 Routing Architecture | Redesigned a customer-service chatbot by routing inquiry types across RAG ON/OFF paths via an o1 router.Lifted end-to-end answer accuracy from 27% to 85% through evaluation-driven routing. | Product, AI Workflow, Evaluation System | Answer accuracy 27% → 85%2024.11 |
Working Method
- Define / Structure product ambiguity and operational bottlenecks.
- Build / Translate manual human judgment into products, tools, and automation.
- Measure / Validate outcomes and failure modes with metrics and case evidence.
- Decide / Make fast, explicit decisions to scale, pivot, or stop.
Capabilities
- 0→1 Product Strategy
- AI Workflow Design
- Operational Automation
- Experiment Design
- Evaluation Systems
- Cross-Functional Execution