Alexander

Architected and implemented business analytics Web APIs using Python/Django, PostgreSQL + GIS, and Django Rest Framework. Implemented web service to generate reports PDF based on user’s research using Python/Django, Designed infrastructure of the platform using AWS clouding services – IAM, S3, VPC, ECS, EKS, DynamoDB + Terraform for provisioning and setup CI/CD pipelines using Github actions + Jenkins.

•  Built microservice-based architecture for Web applications using Docker, Kubernetes, AWS ECS, and Terraform.
• Designed and implemented a business search engine using Elastic stacks(Beats, Logstash, Kibana, and Elastic Search) and make it scalable using clouding solutions.
• Designed and implemented ETL + Data Pipeline for business, markets, and industry chain data using Docker, Django admin tools, RabbitMQ server, Scrapy + Splash, MongoDB, Pandas, and Numpy.
• Implemented a multi-tenant subscription system using Stripe and Zoho.
• Led front-end development for a map view of markets using TypeScript/React, Redux, Mapbox, and ChartJS.
• Wrote unit tests and integration tests using Django TestCase, pytest, jest, and enzyme, and used selenium to write automated test scripts.
• Built GraphQL queries and mutations for user-face communications and built REST APIs for admin stuff.

Designed and implemented multi-forked web sockets and REST API containers for load balancing, communication between old frontend and new backend using the same session data and login credentials to make everything happen in the migration process, and designed job scheduler managers and embed it into GitLab CI/CD pipelines to manage background jobs easily using pm2.

• Built GrpahQL queries and mutations for old frontend and user interface part in new frontend.
• Increased company revenue by 120% by building offer-management, campaign management and affiliate system in a new backend codebase.
• Build a testing framework for the NestJS backend for withdraw, offer-clicks, offer-management workflows
• Build engine and command line tool for MySQL database migration.
• Optimized slow MySQL queries and reduced cache size by 35% by refactoring data structure.
• Built Rest API and GraphQL in backend for offer management, postbacks, identity verification, oauth2 login, and withdraw/moderation module.
• Designed and architecture chat and notification module using socket.io

Designed and led the implementation of APIs for publishing Ads posting to social networks – Facebook, Instagram, LinkedIn, Twitter, and subscription system with pineapple payment using Django, Django rest framework, and social-oauth2.

• Built engine for utilizing RETs query and data pipeline to integrate MLS and build UI for fields real estate fields into the database.
• Led TDD in both the backend and front end using unit testing, jest, and enzyme.
• Built front-end pages using React-Native-web/TypeScript + do bug fixes in the main website using TypeScript + React.
• Designed and implemented microservice for email opt-out system using Docker, Django, MJML, RabbitQM, and celery.
• Implemented a complicated multi-tenant subscription system and designed a system for multi-payment processors such as pineapple, and stripe.
• Built GraphQL queries and mutations using graphene-python for a new frontend