Used Python Django as front end web development framework.

Designed and styled Django templates with HTML, CSS & Bootstrap library.

Developed asynchronous web services using Python and delegate long running task to Celery worker.

Build Django views and templates to serve dynamic pages.

Collect platform requirements and developed entity relationship (ER) diagrams.

Developed SQL queries & integrate SQLAlchemy ORM into Python web services.

Migrated MariaDB database server to PostgreSQL.

Use React.JS as web development framework.

Used InfluxDB for time-series database.

Designed and develop custom UI components with styled-components library.

Incorporate graphic design principles into UI design workflow.

Applied typography principles in design.

Apply Physics based animation into React.js application.

Designed and improved platform data modeling. Built data schemas involving PostgreSQL and Cassandra databases.

Designed, developed, and migrated Django based authentication & authorization system to custom auths solution

Moved React.JS to NextJS as web application framework.

Applied security measures in web application development.

Utilized axios library for client application fetching strategies - cookies, error handling, refreshing tokens

Developed client application notification ui - to display platform status to user

NextJS page router nested layout.

Manage databases for web services - PostgreSQL, Cassandra, Redis.

Optimized backend services deployed in Docker container to receive signals by the operating system.

Designed & developed microservices architecture for backend services.

Applied concurrency patterns for Go and Python services.

Incrementally migrate organization vpn from OpenVPN to Wireguard.

Utilized both HTTP protocol and event-driven architecture (EDA) for backend services - built custom solution for EDA communication between services in order to reduce system complexity and cost.

Setup middlewares and access control lists in reverse proxies.

Built email verification system

Optimized user on-boarding services upon registration. Reduced user registration processing time.

Built responsive table with CSS grid.

Implemented useSWR library to provide more client side fetching and caching strategies.

Front end security measures.

Deployed custom web analytics in web application.

Developed & documented internal ux development process

Build user chatbot system analytics & provide charts on dashboard for data visualization

Deep dive into HTTP protocol in order to make decision on:

develop reset password system

Use reactflow library to build feature for client to create custom chatbot chat flow in the web platform.

Implement responsive typography.

Created custom react hook to manage html form and input events

Introduced debounce and throttle to user search query with cached search result on backend service

Deployed object storage server to store and host machine learning data, static files.

Migrated old payment system to Stripe subscription payment system.

Contributed in business decisions to pivot to other market segment, that align with current platform features at minimal re-development cost.

Helped re-develop and build chatbot system architecture to meet new business requirements.

Optimized client side fetching with parallel data fetching which was introduced with the release of React 18

Add Kanban style task management feature into platform as asana or trello alternatives. - Integrate drag and drop task card with user calendar.

Built logging system with logrotation and log to database for mission critical deployment with email alert notification.

Generate email templates with mjml.

Migrated SQLAlchemy psycopg2 based connection pool to psycopg3 to support async connection pool.

Implement custom pub sub system to manage long computation requests.

Built front end logging system - to collect front end server errors and client side errors.

Create servers automation by deployed services to fetch server load and manage microservices accordingly.

Iimprove databases migration methodology - Cassandra clusters migration - incremental backup, restore, schema

Deployed Strapi as headless content management system (CMS) to serve blog post contents.

Extended NextJS Image component to fetch and render image. Reduced server bandwidth while serving optimized image resolution on client side.

Paging cassandra query that returns large dataset.

Migrated calendar library to react-big-calendar.

Optimized ui loading strategy to avoid excessive skeleton flashes.

Utilized useSWR 2.0 feature to provide better user experience when updating data - optimistic UI

Developed scalable, consistent, and efficient UI design system - achieved with Typescript and CSS.

Compared Human Interface, Material UI, and OneUI designs with in-house design system.

Include accessibility features in design system.

Developed cross platform desktop applications with existing web UI component and company design system. The application uses less client system resources compared to app built with ElectronJS.

Integrate design system incrementally into production

Compiled debugging strategies for common CSS bugs.

Use and implement "Getting Things Done" framework into org-agenda.

Built integration test suite to achieve platform wide testing - selenium, cicd pipeline

Built browser extension.

Building custom calendar UI library.