Konstantin Simeonov

kon.simeonov@protonmail.com

github

blog

hackerrank

pic of me

Skills

  1. typescriptReact
  2. typescriptTypescript
  3. typescriptAWS
  4. typescriptAlgorithms
  5. typescriptSQL
  6. typescriptNextJS
  7. typescriptNodeJS
  8. typescriptOOP
  9. typescriptMentoring
  10. typescriptFP
  11. typescriptLinux/bash
  12. typescriptgit

React

I've been using React for 7 (at TelerikAcademy, ChaosGroup, Coursera, Synthesis) years and I love what it offers - reusable components/hooks, terse and declarative code, comprehensible UI state management and reasonable performance. Some of the React features I use regularly are contexts, memos, refs, useEffect, useCallback, keys and fragments.

Work Experience

Senior Full-Stack Dev

at

Loancrate ->

  • Working on app.loancrate.com which is a multi-tenant LOS system powered by AWS, Node, Graphql, React, Postgres and AI
  • Designed and built a bunch of critical full stack features - tenant configuration management, automated UCD feedback integration, new tenant onboarding and authentication, etc
  • Responsible for keeping CI/local builds running quickly and smoothly utilizing Turborepo, Docker, Linux, Bash, Circleci and AWS
  • Leveraged AI to automate product changes to tenant configurations and extract/validate document data on mortgage applications

Senior Full-Stack Dev

at

Synthesis ->

  • Worked on portal.synthesis.is (a student portal with game/study meetings and administrative functionality) with nextjs, typeorm, mysql, zod and react-query
  • Optimized typeorm/mysql queries, modified indexes and constraints, migrated table schemas to improve performance and enable new features
  • Sped up CI runtime multiple times by more than 10 minutes using sharding, parallel db testing and job splitting
  • Introduced strongly-typed middleware for authentication and validation to improve security and dev experience

Senior Software Dev

at

Coursera ->

  • Developed rhyme.com, an in-browser interactive studying VM environment, complete with audio/video calls and video instructions
  • Implemented features like video transcriptions with AWS Transcribe and S3, in-browser video editing with FFMPEG, notification center, input capture/replay
  • Worked with React, Redux, Typescript, AWS, PostgreSQL and Golang
  • Introduced property-based testing, published typescript definitions for untyped libraries, set up code coverage and automated dependency updates

Scala Contractor

at

Pontica Solutions Ltd ->

  • Scheduled emails leveraging Akka and Apache Kafka and implemented email statistics using Apache Spark and Apache Kafka
  • Put together a CI/CD pipeline for the new email scheduling system using GitLab, SBT, Docker, Linux and Bash
  • Ensured code correctness by combining functional programming and testing with ScalaTest and ScalaCheck
  • Used AWS SQS, SNS and S3 to implement customer facing APIs for eventing and data export

JavaScript Dev

at

Chaosgroup ->

  • Worked on V-Ray for Sketchup/Rhino/Revit, which provides a cross-platform Electron UI for interacting with V-Ray
  • Built dynamic user interfaces using Electron, React, Typescript, Mobx - features like color pickers, file and graph explorers, material/geometries libraries
  • Set up unit and e2e test environments with Mocha/Ava/Jest, implemented builds with Webpack, Gitlab/Jenkins CI/CD for apps and libraries

Technical Trainer

at

Telerik Academy ->

  • Delivered lectures that helped more than 2000 students on their journey from beginner to juniour in web development with C#, HTML, CSS and JavaScript
  • Created exam programming problems for topics like algorithms, javascript DOM and programming fundamentals, organized exams and lectures
  • Experienced firsthand how important keeping deadlines is, became better at taking responsibilities and honed organizational skills

Projects

Advent of Code ->

Using fun languages like haskell, rust and plsql to solve Advent of Code algorithmic problems

tsx-ctrl-statements ->

Typescript compiler plugin that adds control flow elements to jsx. Currently sitting at 4K weekly downloads on npm.

aot ->

Pure compile-time implementation of various fun programs (fibs, primes, string ops) using typescript type language.

guacamole-client types ->

Typescript library definitions for apache guacamole-client library which is used at Coursera.

pastes.konsimeonov.lol ->

Web app for sharing code with multiple files per paste, private pastes, code highlighting and more. Build with Nextjs, Postgres and AWS.

blog.konsimeonov.lol ->

A blog where I get to share esoteric, non-trivial or otherwise curious programming insights. Built with Nextjs and AWS.

If you are interested in hiring me, please visit my website https://konsimeonov.lol - it contains a lot more detailed information on my skills, experience and projects!