Since 2020, I've been engaged in a diverse range of projects, with my primary focus on teaching coding principles and producing instructional videos. My mission is to empower novice programmers, equipping them with the knowledge to write high-quality code.I have following skills- Backend (Spring, Nest.js, handling various system components)- DevOps (deployment automation, docker, k8s)- Frontend (React, React Native, Next.js, macOS)- Project strategy/management

Solely developed all necessary components for an e-commerce platform, spanning both frontend and backend development. (0 to 20k MAU)Designed and implemented comprehensive business logic, covering product purchases, delivery, inventory management, refunds, exchanges, and managed settlements for over 200 fashion brands.Identified and tapped into the most sought-after marketing channels by customers, integrating payment systems tailored to each channel.Significantly influenced business operations using growth hacking techniques with Amplitude.Provided regular mentoring sessions for junior frontend developers.

Developing personalized e-commerce service- Architecting and Developing back-end server + Express (Typescript + GraphQL) + PostgreSQL, Document-based storage, neo4j, redis + Functional programming with using `fp-ts` ecosystem + Domain Driven Design (DDD) + Fashion product recommendation engine (Collaborative filtering, Vision AI) + Crawling valuable data for valuable customer experience (Golang) + Developing billing system, subscription system, and delivery tracking- Developing front-end using React + React (Typescript, Redux, React hook) + Back office page (Admin) for managing products, orders, and users + Service web page (https://selectchu.com) + SSR (Next.js)- DevOps + CI/CD (Github Action) + Google Cloud Platform + Docker + Kubernetes (for development server purpose)

Developing blockchain public and enterprise network+ Certificate authority(CA) server based on the PKI system (Node.js) - Developing with ECDSA algorithm, publishing X.509 certificate, CSR, etc.+ Blockchain explorer that facilitate to find transactions and blocks on the website (Nuxt.js)+ Core application (public, enterprise) - C++ - Designing the architecture and developing the application from scratch.+ CLI - Controlling the blockchain network (Golang)link: https://github.com/gruut

Developing Ruby on Rails applicationMAU 10M+ Developing a marketing message system called 'Target service'+ Collaborating with a data scientist+ Crawling valuable data for customers

- Analyzing open source program(ZAP) and added some features.