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Jerome

Jerome

Full-Stack Software Engineer

About Me

I go beyond simply implementing given requirements well β€” I relentlessly dig into the essence and root cause of problems, questioning why they are needed, and I pursue making meaningful, real contributions to customers and the company.

With a small team, I have joyfully built diverse experience spanning Web FE, BE, infrastructure operations, resource management, and team leadership β€” through the process of analyzing system problems and their root causes to grow an IoT service that once failed at just a few thousand devices into one that stably controls and manages an average of 50,000 devices per month within the same resources, over four years.

Recently, in step with the AI era, I have been expanding my joy of learning further β€” into improving team development productivity through AI Agent adoption and building RAG-based AI Agents.

About

JeromeCheonJaehong Cheon
Seoul, Republic of Korea

Handong Global University

AI Β· Computer Science (March 2014 ~ February 2022)

OPIc IH (ACTFL, 2020)

Skills

Languages

JavaScriptTypeScriptGo

Frameworks

NestJSTypeORMJest

Databases & Infra

MQTTMySQLMongoDBInfluxDBAWSApache KafkaDockerKubernetes

Experience

Dable Inc.

Manager Β· Backend Team

Dec 2025 ~ Apr 2026
  • Dable Marketing AI Agent Design & Development
    • Built RAG pipeline via vector embedding of advertiser FAQ docs β€” established NestJS + LangChain agentic service foundation for the team
    • Chose in-memory Vector Store over external Vector DB to eliminate unnecessary budget overhead
    • Built automated email workflow (collect β†’ AI response β†’ review β†’ send) via Gmail API β€” reduced response time by 95%
    • Built back-office dashboard for AI reply review, centralizing advertiser inquiry management with logging

MerlotLab Inc.

Senior Researcher Β· Service Dev Team

Jan 2022 ~ Nov 2025
  • "MEMS" Energy Monitoring System Development [2025]
    • Introduced InfluxDB & integrated into in-house solution β€” established 2-year power consumption trend data pipeline previously unrepresentable in MySQL
    • Built real-time AMI power metering & graph visualization dashboard β€” reduced dependency on external solutions and cut operating costs
    • Implemented on-demand CSV export (yearly/monthly/daily) β€” changed AWS S3 ingestion method and cut server costs
    • 40M-record HTTP GET response: 7.3s β†’ 356ms; aggregation cron job: 15min β†’ 21sec
  • GRID 3.0 Responsive Web UI/UX Application [2024]
    • Led full source code refactoring and UI/UX overhaul (75% contribution)
    • Added i18n multilingual support
  • "Smart Building Solution" Development [2023–2024]
    • Contributed to Zigbee sensor MQTT spec design and optimized parallel processing 200ms β†’ 40ms
    • Expanded "schedule" feature to sensor-based smart dimming & SMS alert "automation" with fine-grained condition settings
    • Developed IR appliance remote control feature for Samsung & LG air conditioners
    • Upgraded to simultaneous multi-device automation triggered by weather and power meter data
  • GRID B2B IoT Control System Optimization [2022–2025]
    • Scaled system from 10K to 100K and 1M+ device capacity via legacy refactoring and DB redesign
    • Go-based MQTT parallel processing app: 2,000-device sync time 948ms β†’ 387ms
    • Led CRA β†’ Vite 100% migration of GRID WEB β€” bundle loading 3x+ faster
    • Established DDD/TDD-based team development and maintenance culture
    • Developed GFDR frequency-following lighting control system (KEPCO) and passed certification (article)
  • System Infrastructure & Performance Optimization [2022–2025]
    • Participated in AWS EKS/ECR multi-cluster Kubernetes infrastructure build-out
    • Contributed to mono-repo management, zero-downtime deployment, CI/CD, and logging pipelines
    • Developed MQTT message encryption and authentication mechanism for security hardening
    • Contributed to MSA design integrating MongoDB, Redis, InfluxDB alongside MySQL

Kzone

Frontend Dev Intern Β· Development Team

Jul 2021 ~ Dec 2021
  • Global Startup Academy 2nd Cohort
    • Developed and launched "customfactoriz" e-commerce site using Shopify
  • Developed Kzone homepage as a React web application
  • WordPress development and homepage migration

Projects

데이블 κ΄‘κ³ μ£Ό 고객 메일 AI μžλ™ λ‹΅λ³€ 생성 및 κ²€μˆ˜ λŒ€μ‹œλ³΄λ“œ

Dable.Inc

2026.01 ~ 2026.04

λ°μ΄λΈ”μ—μ„œ μ‹ κ·œ κ΄‘κ³ μ£Ό/λŒ€ν–‰μ‚¬μ˜ λŒ€μ‹œλ³΄λ“œ 적응 쀑 λ°œμƒν•˜λŠ” μ΄νƒˆμ„ λ°©μ§€ν•˜κ³  κ΄‘κ³ νŒ€μ˜ 반볡적인 λ‹¨μˆœ 문의 λŒ€μ‘ λ¦¬μ†ŒμŠ€ λ‚­λΉ„λ₯Ό ν•΄κ²°ν•˜κΈ° μœ„ν•΄ 2026λ…„ 1λΆ„κΈ° ν”„λ‘œμ νŠΈλ‘œ AI μ‹œλŒ€μ— 맞좰 RAG 기반의 λ§ˆμΌ€νŒ… AI Agentλ₯Ό κ°œλ°œν•˜κ²Œ λ˜μ—ˆμŠ΅λ‹ˆλ‹€. FAQ 및 고객 λŒ€μ‘ 메뉴얼 λ¬Έμ„œ 기반으둜 μžλ™ν™”λœ 닡변을 λΉ λ₯΄κ²Œ μ œκ³΅ν•¨μœΌλ‘œμ¨ κ³ κ°λ“€μ˜ 정보 접근성을 λ†’μ—¬ 적응λ₯ κ³Ό μž”μ‘΄μœ¨μ„ 높이고, μ‘λŒ€ μžλ™ν™”λ₯Ό 톡해 ν™•λ³΄λœ λ¦¬μ†ŒμŠ€λ₯Ό λ‹€λ₯Έ 핡심 업무에 집쀑할 수 μžˆλŠ” ν™˜κ²½μ„ κ΅¬μΆ•ν•˜λŠ” 것을 지ν–₯ν•©λ‹ˆλ‹€.

BackendDatabaseRAGAI

λ©”λ₯Όλ‘œλž© μ—λ„ˆμ§€ λͺ¨λ‹ˆν„°λ§ μ‹œμŠ€ν…œ(MEMS) λŒ€μ‹œλ³΄λ“œ 개발

MerlotLab.Inc

2025.02 ~ 2025.11

Energy Monitoring System(EMS)λŠ” μ „λ ₯, κ°€μŠ€ λ“±μ˜ μ—λ„ˆμ§€μ›μ˜ μ†Œλͺ¨λŸ‰μ„ μ‹€μ‹œκ°„μœΌλ‘œ μΈ‘μ •ν•˜κ³  κ΄€μ œν•˜λ©° μ‚¬μš© νš¨μœ¨μ„ 높이고 λΉ„μš©μ„ μ ˆκ°ν•˜λŠ”λ°μ— νš¨μš©μ„±μ΄ 큰 μ‹œμŠ€ν…œμž…λ‹ˆλ‹€. λ©”λ₯Όλ‘œλž© 만의 MEMSλ₯Ό κ΅¬μΆ•ν•¨μœΌλ‘œμ¨, μ „λ ₯λŸ‰ 계츑 μ‹œμŠ€ν…œκ³Ό λ©”λ₯Όλ‘œλž© IoT μ‘°λͺ…μ˜ μ†Œλͺ¨ μ „λ ₯ 및 절감 μ „λ ₯을 μ‹€μ‹œκ°„μœΌλ‘œ λͺ¨λ‹ˆν„°λ§ν•˜κ³  λ‚˜νƒ€λ‚΄μ–΄ μ‚¬μš© κ³ κ°μ‚¬μ—κ²Œ λ‹¨μˆœ μ‘°λͺ… μ œμ–΄ 뿐만 μ•„λ‹ˆλΌ μ—λ„ˆμ§€ κ΄€λ¦¬κΉŒμ§€ κ°€λŠ₯ν•œ 폭넓은 κ²½ν—˜μ„ μ œκ³΅ν•˜λŠ”λ°μ— 큰 μ˜μ˜κ°€ μžˆμŠ΅λ‹ˆλ‹€.

FrontendBackendDatabaseMQTT

GRiD 3.0 UI μ—…κ·Έλ ˆμ΄λ“œ

MerlotLab.Inc

2024.03 ~ 2024.09

λΉ„μ¦ˆλ‹ˆμŠ€ 고객사λ₯Ό μœ„ν•œ ν”Œλž«νΌ GRiD 2.0 μ›Ή μ• ν”Œλ¦¬μΌ€μ΄μ…˜μ— UI/UXλ₯Ό μ΅œμ ν™” ν•˜λ©΄μ„œ μ‹ κ·œ κΈ°λŠ₯을 μΆ”κ°€ν•˜μ—¬ GRiD 3.0으둜 κ°œνŽΈν–ˆμŠ΅λ‹ˆλ‹€.

FrontendBackend

λŒ€κ·œλͺ¨ 100만+ κΈ°κΈ° 운용 κ°€λŠ₯ν•œ GRID μ‹œμŠ€ν…œ μ„±λŠ₯ μ—…κ·Έλ ˆμ΄λ“œ

MerlotLab.Inc

2023.02

GRiDλ₯Ό λ„μž…ν•˜λŠ” 고객사가 λŠ˜μ–΄λ‚˜λ©΄μ„œ 10만 개 처리 규λͺ¨ μ„œλ²„ ν•œκ³„λ₯Ό ν™•μž₯ μ‹œν‚¬ ν•„μš”κ°€ μžˆμ—ˆμŠ΅λ‹ˆλ‹€. 이에 κΈ°μ‘΄ μ„œλ²„μ—μ„œ 병렬 μ²˜λ¦¬μ™€ μ„±λŠ₯ μ΅œμ ν™”κ°€ ν•„μš”ν•œ κΈ°λŠ₯을 λ”°λ‘œ λΆ„λ¦¬ν•˜μ—¬ 별도 μ„œλ²„λ₯Ό κ΅¬μΆ•ν•¨μœΌλ‘œμ¨ 100만 개 μ΄μƒμ˜ μ‘°λͺ…κ³Ό 각쒅 κΈ°κΈ° νƒ€μž…μ„ λ¬Έμ œμ—†μ΄ 수용, μ„œλΉ™ν•  수 μžˆλŠ” μ‹œμŠ€ν…œμ„ κ΅¬ν˜„ν•˜κ²Œ λ©λ‹ˆλ‹€.

BackendMQTTDatabaseAWS

μ‘°λͺ…/κΈ°κΈ° μ œμ–΄ μžλ™ν™”λ‘œ κ΅¬μΆ•ν•˜λŠ” Smart Building Solution

MerlotLab.Inc

2022.11 ~ 2024.10

κΈ°μ‘΄ GRiD의 μ œμ–΄ μŠ€μΌ€μ€„ κΈ°λŠ₯을 "μ„Όμ„œ, 날씨 연동 μ‘°λͺ… μ œμ–΄ μžλ™ν™”"둜 ν™•μž₯ν•˜μ—¬ λ‹¨μˆœ μ‹œκ°„ 섀정에 λ”°λ₯Έ μ‘°λͺ… μ œμ–΄λΏλ§Œ μ•„λ‹ˆλΌ μ—°λ™λœ μ„Όμ„œ μ’…λ₯˜μ™€ λ°œλ™ 쑰건에 따라 λ‹€μ–‘ν•œ ν™˜κ²½μ—μ„œλ„ μžλ™μœΌλ‘œ μŠ€λ§ˆνŠΈν•˜κ²Œ μ œμ–΄, κ΄€λ¦¬λ˜λŠ” Smart Building Solution으둜 λ°œμ „μ‹œν‚¨ μž₯κΈ° ν”„λ‘œμ νŠΈμž…λ‹ˆλ‹€.

FrontendBackendAWSDatabaseMQTT

10만+ κΈ°κΈ° μ œμ–΄ 및 μš΄μš©μ— μ ν•©ν•œ GRID(μ‚°μ—…μš© IoT μ‘°λͺ… μ œμ–΄ μ†”λ£¨μ…˜) μ„±λŠ₯ μ΅œμ ν™”

MerlotLab.Inc

2022.01 ~ 2023.01

GRiDλŠ” ν—ˆλΈŒ(Hub)λΌλŠ” Wifi νŽŒμ›¨μ–΄ 기반 μ€‘μ•™μ œμ–΄ ν•˜λ“œμ›¨μ–΄ κΈ°κΈ°λ₯Ό 톡해 λ©”λ₯Όλ‘œλž©μ˜ Mesh 기술이 νƒ‘μž¬λœ μ‘°λͺ…, μž₯치, μ„Όμ„œ λ“±μ˜ λ””λ°”μ΄μŠ€λ₯Ό ν΄λΌμš°λ“œ μ„œλ²„λ‚΄μ—μ„œ κ΄€λ¦¬ν•˜κΈ° μœ„ν•œ B2B IoT Web Server Application μž…λ‹ˆλ‹€.

FrontendBackendAWSDatabaseMQTT

(μ£Ό) 케이쑴 ν™ˆνŽ˜μ΄μ§€ 개발

Kzone

2021.10 ~ 2021.12

μΈν„΄μœΌλ‘œ μΌν•˜λŠ” κΈ°κ°„ λ™μ•ˆ 개인 개발둜 μΌ€μ΄μ‘΄μ˜ ν™ˆνŽ˜μ΄μ§€λ₯Ό κ΅¬μΆ•ν–ˆμŠ΅λ‹ˆλ‹€.

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