● Project: "Warehouse" (Esim managing Microservice) - Contributed to MSA conventions/standards/communication - Managed Esim Delivery and Stock REST API - Background Stock-filling tasks through scalable job queue with BullMQ (Redis) - Setup RabbitMQ produces/consumers handled with topics/logs/retry algorithms - Refactored legacy implementations simplifying them with reusable components - Implemented global error handler with ElasticSearch logs and Slack alerts - Configured Datadog logs and monitors

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● 🦠 Project: "Labnote" (Bio-nano Research Record) - Led the migration from serverless architecture (AWS SAM) to a scalable Ts+Node+Express REST API. - Migrated DynamoDB to MongoDB using Mongoose, improving database performance and flexibility. - Implemented TDD using Jest, resulting in more reliable codebases. - Orchestrated CI/CD workflows with GitHub Actions, ensuring test, build, and deployment. - Developed WebSocket functionality for real-time collaboration. - Set up advanced logging, error handling, and activity tracking systems, promoting a data-driven approach. ● 🐁 Project: "Orange" (Clinical Trial Study Record) - Engineered REST API using Nest.js, enhancing scalability and maintainability. - Implemented efficient file upload and download logic with progress UI, enhancing user experience. - Integrated Elasticsearch (AWS) and MongoDB Atlas Search to enable powerful search capabilities within the application. - Architected an external Log-API server for user activity logging. - Leveraged Sentry and CloudWatch Agent for robust error reporting and monitoring. ● 🏗️ Infrastructure - Redesigned AWS Cloud architecture including S3, CloudFront, EC2, LoadBalancer, SNS, ElasticCache, ElasticSearch, and SES. - Managed QA server, fostering efficient collaboration among squads during development cycles. - Implemented a Redis caching layer. - Optimized Jest tests by fine-tuning heap size and reducing execution time. - Enhanced build times and reduced bundle sizes by configuring Webpack. ● 👫 Team Culture & Collaboration - Implemented Git-flow (protected branch rules) - Implemented Github templates & branch/commit naming conventions - Implemented Git submodules (to share types & interfaces) - Implemented tech blogging culture with the purpose of improving member's careers through sharing knowledge as a Team - Manipulation of git commit's author to own the contribution - Participate as a technical interviewer in dev's interview - Created interview assessments (Front/Back end)

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● 📈 Project: Stock manager (Admin Page) - Developed dynamic and responsive web applications using TypeScript, React, Redux. - Leveraged Next.js for SSR, enhancing SEO and initial loading performance. - Utilized React-Query to manage complex data fetching and synchronization needs. - Crafted reusable UI components with Styled-components for consistent and maintainable styling. - Collaborated with designers to transform wireframes into polished user interfaces. - Contributed to a design system using Storybook for efficient UI component development. - Participated in code reviews, providing feedback to ensure code quality and best practices. ● 🏨 Project: "Keymedi" (Medical Academic Webinar Portal) - Led the frontend development using React, MobX, and TypeScript. - Collaborated with Backend (PHP/Python) to integrate RESTful APIs data flow. - Implemented MobX for state management, improving data consistency and maintainability. - Collaborated in testing using Jest and React Testing Library to ensure quality. ● 직장인을 위한 웹개발 입문 클래스 -1:1화상미팅 - HTML / CSS / Vanilla JS -HTTP/URL/DNS/RESTAPI - 소스 관리 (Git/Github) 및 업무 프로세스 (Github workflow/ Jira ticket/ Sentry issues) - Clone project guide - Usage of third-party packages & open API

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● Project: 'Prime' (REST API with GraphQL) - Worked with Typescript, Node.js, GraphQL, Prisma+Nexus, PostgreSQL - Data modeling and Schema generation with PostgreSQL - Implement query and mutation resolvers for GraphQL with Apollo Server - Implement user permission shield rules - Developed an API resource fetching Korean Business Registration Number status (사업자등록 상태) & retrieve relevant detailed information for many purposes. - Created @Nexus/schema 'argument validator' plugin (Open-source) ● Open-source contribution @dooboo-ui (Expo, Typescript, React-Native, Jest) - Created customizable `Select` dropdown component - Created customizable `Charts` independent components such as `LineChart`, `BarChart` @Hackatalk - Updated ProfileUpdate image upload request with useMutation - Updated singleUpload mutation & azure blob - Created mutation & useMutation instead of fetch - Added fetchGraphQL logic to handle uploadable - Fixed file uploading with Blob constructor

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● Landing page renewal Refactoring from HTML + CSS (Bootstrap) + Javascript page to React.js + Gatsby.js (with plugins) - Link: https://plating.co.kr/ ● B2B order Dashboard This page is managed by the company managers only. It sends requests to the Firestore db with the selected company and selected date/range as a parameter for retrieving the orders made by the customers. Front: React, React-hooks, Ant-design. Back: Firebase products (Authorization, Firestore, Hosting) ● Admin page (Back-office app) The admin page has many management features like scheduling, customer, product, manufacturer, and closing. The users are managed with permission scenarios and can be restricted to what they can see or edit on each menu. Front: React, React-hooks + MobX, Ant-design, moduled CSS. Back: Node.js + Express (REST API), Sequelize ORM, MySQL. Deploy: AWS EC2 (Ubuntu), Nginx config with reverse proxy.

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Frontend Web projects - HTML, CSS - Bootstrap, Material-UI, Ant-design - Styled Component - Responsive web (Mobile-first) - React.js - Gatsby.js - Firebase

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[ Corporate Finance, Accounting Fund Management / General Administration ] - Corporate fund management and settlement work, and corporate and head office monthly reports. - HR payroll, in-house accounting system management, etc. - Korean/Spanish translation service (in charge of communication with local accountants, tax authorities, and headquarters) [ Finance role ] - Manage incomings and outgoings, reports cash flow - Sales & Cost: Sales per department, archive tax receipt, and managing spending items - Create reports and manage long-term outstanding payments - Closing related reports: monthly closing, monthly comparison, and budget management - Consult and collaborate with local accountants and tax authorities (Spanish-Korean translator) - Salary tax, Social Security tax (IMSS, INFONAVIT), manage payments and payroll.

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[ Accounting, Finance Assistant / Administration Support ] - Input sales purchase slip - Support monthly/quarterly closing - Support related account audit work and report additional tax - Organize and store classification of evidence ​- Support business development efforts to optimize content distribution and measure the reach of DailyFX content

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