2026 Sogang University AI Winter Camp Hackathon - 2nd Place Award
RivalQ
AI-powered Competitor Analysis & Strategy Service
2026-01
Team of 2
Backend Development
n8nNext.jsNode.js
TERMINAL://KNN.CAFE
// CAFE OWNER
Kyoungin Nam
"Curious about Kyoungin? Ask Arabot!"
[ START CHAT ]
CAFE
Cloud · AI-Native · Finance · Engineering
Hands-on experience from cloud-native environments on AWS to enterprise data pipelines on Azure. I integrate various cloud services (GCP STT, etc.) where they fit best and hold certifications reflecting my consistent interest in infrastructure.
Since my early development days, I've intensively applied emerging AI tools in practice, naturally learning their strengths, limitations, and productivity hacks. This interest led me to build services with AI Agents and RAG, earning hackathon awards that validated my applied AI skills.
With a Business Administration major and Investment Asset Manager certification, I built foundational knowledge of financial markets and products. This enables faster, more accurate understanding and communication of business logic and terminology in fintech domains.
A backend developer specializing in Spring Boot and Node.js, but startup experience taught me React/Next.js frontend development too. With numerous projects under my belt, I'm comfortable understanding and implementing end-to-end service flows.
01
About
Spring Boot · Node.js Developer
MAIN LANGUAGES
Java
JavaScriptEDUCATION
Kookmin University
[Major]International Business (KIBS)
[Dual Major]Information Technology
2019-03-01 ~ 2026-02-11
Seoul, Republic of Korea
Hello, I am Kyoungin Nam, a developer who CAFEs — Cloud · AI-Native · Finance · Engineering.
I have hands-on multi-cloud experience with AWS, Azure, and GCP, along with a solid understanding of the finance domain backed by a dual major in Business Administration and a Certified Investment Manager qualification.
I care about both product impact and solid engineering, and I enjoy building stable, scalable backend systems. I also have a deep interest in practical AI applications — I've built AI Agent and RAG-based solutions and won awards at hackathons.
Currently, I'm interested in backend and related infrastructure (cloud, etc.) positions, and I especially want to grow my expertise in fintech. This portfolio documents the problems I've tackled and my approaches to solving them. Feel free to look around, and I'd love the chance to connect.
Best Regards, Kyoungin Nam
AWARDS
2026 Sogang University AI Winter Camp: Agent Development Mini Hackathon with n8n
2nd Place AwardSogang University
Won 2nd place by developing 'RivalQ', a digital marketing service that automatically researches and analyzes competitors' product information, pricing policies, and marketing strategies, and proposes customized competitive strategies by referencing pre-registered company information via RAG.
2026-01-27
Interdisciplinary & Convergence Major Completion Essay Contest
2nd Place AwardKookmin University College of Future Convergence
Wrote an essay about my 14-month global journey through Vietnam and the United States, winning the 2nd Place Award. The story has been officially published on the university's website and guidebook.
2025-12-01
The 2nd Global Co-Prosperity Joint Academic Conference
3rd Place AwardKookmin University
Planned the daily living assistance platform "Kor-Eco" and led the development process as team leader, winning the 3rd Place Award.
2025-11-28
CERTIFICATIONS
FINANCE
Certified Investment Manager
Korea Financial Investment Association (KOFIA)
2026-01-29|26-000116
CLOUD
Microsoft Certified: Azure Data Fundamentals (DP-900)
Microsoft
2024-07-21|838DAD2ABAA6CE35
CLOUD
Microsoft Certified: Azure Fundamentals (AZ-900)
Microsoft
2024-07-14|75B21F93AFBE994D
DATABASE
SQL Developer (SQLD)
Korea Data Agency
2024-06-21|SQLD-053011690
LANGUAGES
KoreanNative
EnglishAdvanced
TOEIC905/990
2024-03-31142943
ChineseBeginner
HSK Level 3271/300
2024-02-04H32402005742
02
Experience
From US startups to global internships
Jan 2026
Feb 2019
Mar 2025
GALLERY
Twilio-Based Real-Time Call Analysis and Speaker Diarization Pipeline
Built sales coaching system from call transmission/reception through real-time speaker separation to AI analysis
TwiMLWebSocketGoogle STTMedia StreamAudio Processing
- •Twilio MSK-based call system: Implemented call masking feature for bidirectional calls without exposing agent's personal number using TwiML.
- •Physical track separation and real-time STT conversion: Overcame the limitations of single-track audio analysis by physically separating caller and callee streams from Twilio Media Stream and receiving each through dedicated WebSocket channels. Converted μ-law 8 kHz audio to PCM 16 kHz and performed real-time 2× resampling to meet Google STT requirements. By transmitting the refined channels individually to the Google STT streaming API, achieved low-latency text conversion and reliable speaker separation.
- •AI pipeline integration: Implemented automatic generation of sales insights including call summaries and customer intent analysis by transmitting text data to Claude AI immediately upon call completion.
Email Campaign System Through Cross-Server Role Distribution
Developed marketing platform with HTML/MJML dual editor and load balancing considerations
MJMLSendgridLoad Balancing
- •User-friendly dual editor: Developed 'HTML code editor' for professionals and MJML-based 'visual editor' for general users. Maximized email production efficiency by enabling intuitive complex operations like adding URL/text buttons, image resizing, and layout design through drag-and-drop alone.
- •Cross-server role separation (Load Balancing): Secured system stability by separating roles where Node.js server handles MJML-to-HTML rendering exclusively, while Spring Boot server manages bulk sending and I/O loads.
Document Management Automation with Dynamic Signature Scaling and Token-Based Collaboration
High-flexibility contentEditable-based editor and dynamic contract environment adaptation system
contentEditableTokenizationPDF ManagementSendGrid
- •Diverse signature generation logic: Implemented logic to generate designed signatures from text input or extract only signatures through image preprocessing when users upload photos of handwritten signatures.
- •Dynamic signature scaling and editor: Implemented scaling logic where signature fields dynamically increase/decrease based on number of parties (buyers/sellers). Managed various document input fields like addresses and phone numbers as variables for direct user input and editing, adopting contentEditable-based editor to flexibly handle these dynamic elements.
- •Tokenization-based review and collaboration system: Built review system enabling supervisors to precisely highlight phrases requiring modification, write comments, and assign responsible persons. Enabled position tracking even after text modifications by tokenizing all words in documents and assigning IDs.
- •Automated document lifecycle: Documents are automatically converted to PDF via Playwright and sent through SendGrid. Completed non-stop workflow where recipients receive immediate access (approval) tokens upon clicking email link and entering security code, directly entering signature and approval page without separate registration process.
Event Trigger-Based System Email and Template Engine
Designed automated email notification system responding to various user scenarios
EJSSendGridEvent-Driven Architecture
- •Event-based sending design: Built system where emails are automatically sent by classifying various possible service events as triggers including password reset, new signup welcome, email OTP authentication, and account deactivation.
- •EJS template design and implementation: Enhanced maintenance efficiency by directly designing and implementing template structure using EJS to dynamically bind necessary data for each scenario.
Access Control and Audit Architecture
Phased security architecture utilizing RS256 tokens, bridge tokens, and ITGC/IAC controls
JWT (RS256)Google OAuth2FA (TOTP)RBACBridge TokenAudit Logging
- •RS256-based JWT and bridge tokens: Built a JWT system using RS256 asymmetric encryption. Introduced "bridge tokens (Company Selection, Pre-Auth Token)" to safely manage intermediate login steps such as 2FA waiting and company selection, allowing precise control of authentication states.
- •Google OAuth and 2FA: Implemented Google OAuth integration for user convenience and 2FA (OTP) authentication for enhanced account security.
- •RBAC designed under ITGC principles: Grounded in the Zero Trust principle of "never trust, always verify", RBAC was designed to clearly separate admin, general users, and team-level roles. Approached from an ITGC (IT General Controls) perspective, ensuring consistent control procedures across team management, invitations, and permission changes.
- •IAC-based API activity logging and audit trail: To strengthen Information Access Control (IAC), designed an audit logging system that stores API activity of users, admins, and system accounts in the database. Captured request actor, accessed resources, and actions to support security incident analysis and detection of permission misuse.
Redis/BullMQ-Based SMS Campaign Sending and Cost Management System
Bulk SMS sending and campaign operation management system via Webhook
RedisBullMQTwilio API
- •Event-driven sending design: Processed bulk campaign sending requests asynchronously using Redis and BullMQ, and applied exponential backoff-based retry logic on failures to ensure resilience against temporary external API outages.
- •TCPA compliance and risk management: Built an automated opt-out process based on keywords such as STOP and START, reducing legal dispute risks by complying with TCPA regulations in the United States.
- •Encoding-based segment calculation and cost synchronization: Automatically calculated segment counts based on message encoding (GSM-7, Unicode) to accurately track costs, and implemented a real-time billing system with platform markup (5%) to visualize the revenue structure.
Tech Stack
Spring BootNode.jsNext.jsReactPostgreSQL
GALLERY
Sep 2024
GALLERY
VORI -Remade- (Voice-to-Workflow Intelligence)
Project management system converting real-time meeting audio to text and auto-generating Kanban tickets via AI analysis (Refactored Legacy Project)
WebSocketOpenAI WhisperKafkaAWS
- •Phase 1: AWS-based Architecture & Business Validation: Designed a serverless distributed processing system using Lambda and MSK under AWS mentorship. Validated business value through a final pitch based on an investment scenario at the AWS Irvine office.
- •Phase 2: Performance Optimization via Independent Refactoring: Conducted independent refactoring to resolve cost issues from managed services. Improved workflow speed by 57% and cut costs by 83% by building a real-time pipeline using WebSocket and Whisper.
- •Hybrid Data Processing & Token Cost Optimization: Dualized data processing logic to minimize LLM API costs. Delegated complex context understanding to the LLM while processing simple word frequency analysis and statistics directly on the backend server, significantly reducing token usage.
MakeEat (AI Receipt-Based Recipe Recommendation)
Service extracting ingredients from receipt images to provide personalized recipes and precise nutritional analysis
PyTorch (EasyOCR)Tesseract OCRGPT-4Node.js
- •Hybrid OCR pipeline construction: Improved text recognition accuracy by 56.2% compared to single model usage by separating text detection (EasyOCR) and recognition (Tesseract) stages.
- •Cost reduction and logic enhancement: Cut costs by 80.7% by sending preprocessed text instead of images to GPT-4. Increased analysis accuracy by 55% vs competitors by staging nutritional calculations and cross-referencing external DBs.
Pawsome Day (Dog Daycare Automation Solution)
Dog photo auto-classification ML pipeline and journal automation service targeting US local dog centers
OpenCVNumPyFastAPIWeb ScrapingTableau
- •ML-based image classification automation: Automated dog photo sorting by implementing algorithms that preprocess images/extract facial features via OpenCV and process training data with NumPy.
- •Field-oriented UX research and data analysis: Analyzed pain points by scraping/visualizing reviews from 80 California centers and conducted field interviews to incorporate practical requirements.
Tech Stack
FastAPINode.jsAWSPostgreSQL
GALLERY
Jun 2024
GALLERY
Global Attendance Data Integration System
Built real-time analytics environment by integrating distributed attendance data from global branches
Azure Data FactorySQL ServerPower BIVisual StudioSharePoint
- •ETL pipeline construction: Built ETL pipeline automatically extracting and integrating data from API and SharePoint using Azure Data Factory
- •Data processing and analysis report creation: Provided insights to management by processing data with SQL Server and Visual Studio, creating SRS-based analysis reports
- •Power BI dashboard construction: Visualized company-wide real-time attendance status and provided decision support environment by building Power BI dashboard
Tech Stack
Azure Data FactorySQL ServerPower BI
GALLERY
Sep 2023
Education
Started IT Convergence Major
Sep 2023
Jul 2021
Military Service
Duty Police (National Assembly Guard)
Jul 2021 Enlisted · Jan 2023 Discharged
Mar 2019
Education
Enrolled in Kookmin University, International Business
Mar 2019
Feb 2019
Education
Graduated Paichai Highschool
Feb 2019
03
Projects
Company projects are not included due to NDA.
Solo Startup Project (In Progress)
YeogiJomJabhyeo
Fish Habitat Information App for Fishing Beginners
2025-12 ~
Team of 1
Full-stack Development
Spring Boot(Kotlin)QGISWeb Scraping
2nd Global Co-Prosperity Academic Festival - 3rd Place Award
Kor-Eco
Location-based Recycling Assistant App for Foreigners
2025-10 ~ 2025-11
Team of 4
Full-stack Development
Next.jsNode.js
KMU Global PBL Program (Personal Refactoring)
VORI -Remade-
Voice Recognition-based Workflow Automation System (Independent Refactoring)
2024-12 ~ 2025-02
Team of 2
Backend Development
WebSocketOpenAI WhisperKafkaPostgreSQL
KMU Global PBL Program
MakeEat
AI Receipt-based Recipe Recommendation Service
2024-11 ~ 2024-12
Team of 2
Backend Development
PyTorchOCRGPT-4Node.js
KMU Global PBL Program
VORI (AWS)
Voice Recognition-based Kanban Board Automation Service
2024-10 ~ 2024-12
Team of 3
Backend Development
AWS LambdaAWS MSKAWS S3AWS Transcribe
KMU Global PBL Program
Pawsome Day
Dog Daycare Workflow Automation Solution
2024-09 ~ 2024-12
Team of 4
Backend Development / UX Research
OpenCVNumPyFastAPIWeb ScrapingTableau
04
Contact
Feel free to reach out