Senior Full-Stack Engineer

Kaloyan D. Bozhkov

Email: kaloyan@bozhkov.com

LinkedIn|GitHub

Highlights

I've spent the past decade developing client and server-side software and bringing it to life in production. Personally, I fancy good system design, talking to people and taking action. These three things have been key to my growth and increased responsibilities at various roles I've had.

  • 10+ yrs of experience with design and development of software systems
  • 7+ yrs of production experience with JS, CSS/SCSS, Webpack and Babel
  • 5+ yrs of production experience with React, Redux/Zustand and Micro-frontends architectures
  • 5+ yrs of production experience with Node.js, Typescript and Microservices architectures
  • 4+ yrs of experience with Figma and UI/UX Design
  • 3.5+ yrs of production experience with Cypress, Jest, Enzyme and React Testing Library
  • 3+ yrs of production experience with Prisma, tRPC and GraphQL
  • 3+ yrs of production experience with Next.js, Vercel and Netlify
  • 3+ yrs of production experience with Python, Django, Flask and SQLAlchemy
  • 3+ yrs of experience with Docker and CI/CD pipelines
  • 2+ yrs of experience with TailwindCSS, Three.js, React Three Fiber and D3.js
  • 1.5+ yrs of experience with Rust
  • 1 yr of experience within the Blockchain and Web3 space

Tech Skills

Node.JS, TypeScript, Python, Rust
Express, Next.JS, React, TailwindCSS, SCSS, Flask, Django
tRPC, graphQL, REST
Zustand, Redux, Zod, Three.JS, D3.JS, React Query, Apollo Client
Eslint, Stylelint, Prettier, Husky, WebPack, Babel, Code Generator
Prisma, Postgres, MySQL, Firestore, SQLAlchemy
Docker, AWS, Google Cloud Console, Vercel, Netlify
CI/CD, Github Actions
Cypress, Jest, Enzyme, React Testing Library
Figma

Experience

Senior Full-Stack Engineer

Element Human

(1/2024 - Present, remote)

  • Advancing efforts to expand and enhance Project Mercury
  • Building new social platforms that allow benchmarking the human emotion behind creative content within real-life-like UX:
  • YouTube Shorts, has unlocked benchmarking influencer marketing via YT

Senior Full-Stack Engineer

Clutchy

(6/2023 - 11/2023, remote)

Node.JS, GraphQL, Firebase
React, TailwindCSS, Apollo Client
Docker, AWS, GitLab CI
NFTs, Sui blockchain

  • Streamlined community Bids process through strategic system design changes, resolving glitches and improving user experience, leading to a 65% decrease in support tickets and a 96% increase in successful bids
  • Strategically led the management of listing and delisting processes within the NFT marketplace, successfully delivering key features. Achieved a 20% reduction in processing time, optimizing platform efficiency and enhancing overall user experience

Senior Full-Stack Engineer

Element Human

(11/2020 - 7/2023, remote)

TypeScript, Next.JS, Prisma, Zod, tRPC, Clerk
React, Zustand, Redux, TailwindCSS, SCSS
Jest, Enzyme, React Testing Library
Webpack, Babel
Python, Django, Flask, SQLAlchemy, PostgreSQL
Docker, Google Cloud, GitLab CI
Figma, Phrase
Biometric, Timeseries and Human Emotion Data

  • Revamped the "survey engine" project by designing a new architecture and implementing it with the latest technologies, this resulted in enhanced efficiency, scalability and 100% reliability
  • Established a scalable system architecture for periodically E2E testing multiple interconnected systems, resulting in continuous operational reliability throughout the years and 95% of bug spotting pre-release
  • Led collaborative efforts with business partners, orchestrating the systematic collection of requirements and formulating strategic action plans for the design and development of innovative projects and features. Executed leadership strategies that ensured a 35% acceleration in project delivery, consistently meeting or exceeding established timelines. Explore short demos of a few of these achievements:
  • Project Mercury, introduced completely new, subscription based, income stream for the business
  • TikTok, enabled business partners to target more creators, resulting in £10k RMR
  • Instagram, fully configurable social environment and..
  • Facebook, for seamless ad campaign performance testing
  • Instagram Carousels, the carousels feature elevated the competitive edge of our business partners
  • Significantly elevated observability for multiple micro-frontends by establishing uniform logging standards through the implementation of a custom abstraction layer atop Datadog. This strategic effort not only enhanced monitoring efficiency by 25% but also facilitated a more cohesive debugging process across diverse teams, fostering a collaborative and streamlined approach to issue resolution
  • Implemented survey localization, empowering clients to extract metrics from new markets (Spain, Italy, Germany, France, South Korea), enhancing global reach and market insights, with a modest increase in overall costs by £2k per new survey

Software Engineer

Lotto Systems

(8/2019 - 11/2020, Chester, UK)

React, Redux, Chakra UI, SCSS
Jest, Enzyme, React Testing Library
TypeScript, Node.JS, PostgreSQL, Golang
Docker, GitLab CI
Figma

  • Designed and developed a captivating slot machine game deployed on 150 units, achieving a user engagement rate of 90% and contributing to a 15% increase in overall gaming revenue
  • Collaborated on a horse betting platform, implementing a micro-frontend architecture that efficiently processed real-time horse racing data, resulting in a 25% improvement in platform responsiveness and a 20% reduction in data latency

Software Engineer

MWL Systems

(10/2018 - 8/2019, Wrexham, UK)

React, Redux, SCSS, LASS
TypeScript, Node.JS, PostgreSQL, C# .NET, EntityFramework
Webpack, Babel
Jest, Enzyme
GitLab CI
Figma

  • Led the successful delivery of 15 critical features for existing projects, ensuring the satisfaction of 100% of client and business requests within specified timelines
  • Effectively managed the intricate back-end operations of a monolith project, optimizing performance and reducing system response time by 20% through strategic enhancements

Junior Software Engineer

Daila srl.

(5/2016 - 9/2016, Osio Sotto, IT)

CSS, HTML, JavaScript, JQuery
PHP, MySQL

  • Developed a local comapny website and managed its SEO, driving traffic up by 40%

Publications

Next.JS + Vercel issue identified related to the undici polyfill

Article Link

Helped 150+ engineers with solving an edge-case caused by an issue with the compiled undici polyfill used by Vercel and Next.JS

Migrating from PlanetScale to Neon, using Prisma and pgloader

Article Link

Helped 57+ engineers with migrating from PlanetScale SQL to Neon PosgreSQL, following the announcement of the impending retirement of the PS Hobby plan.

Personal Projects

Automated IG Reels & Posts

Daily AI-powered Content

11/2023 - 12/2023

TypeScript, Next.JS, Prisma, Zod, REST
React, Remotion, Tailwind
Replicate, OpenAI, Meta Graph API
Canvas, Skia
AWS, QStash

Live Link

AICaramba

AI-powered E-Commerce Platform

12/2022 - Present

TypeScript, Next.JS, NextAuth, Prisma, tRPC, Zod
React, Zustand, SCSS, Mantine UI
ESLint, StyleLint & more
DALL-E, Replicate, OpenAI, Stripe, Google Merchant
Three.JS, Canvas
AWS, Vercel, QStash

Live Link

SocksAI

Mystery Next-gen Footwear

10/2023 - Present

TypeScript, Next.JS
React, Zustand, SCSS, Mantine UI
ESLint, StyleLint & more
Stripe
Vercel

Live Link

Custom CV

React renderer for creating PDF CVs

1/2023 - 1/2023

React, TypeScript
React-pdf, Tailwind
React Three Fiber

"To craft a flawless CV that shines both online and in PDF format, finely tuned for Applicant Tracking Systems (ATS); a particularly overengineered piece of virtual paper."

Live Link|GitHub

EnryptVid

Image Manipulation & Rendering on the Edge

1/2022 - 2/2022

FFMPEG-WASM, TypeScript
React, Mantine UI, Canvas

Live Link|GitHub

MindTrace

Sorting 3D Shapes

7/2023 - 7/2023

React, Three.JS, SCSS/CSS3, Mantine UI
Clerk, React Three Fiber

Live Link|GitHub

Mini-Blockchain

Linked-List and Blockchain Hashing with Proof of Work

2/2020 - 2/2020

React, SCSS

Live Link|GitHub|Demo

Game of Boz

Android Platformer Game

2/2015 - 7/2015

Construct, JavaScript
MoPub, Google Adsense

Live Link|Demo

Education

BSc of Computer Science - Computing, Networking & Security

Glyndwr University

9/2017 - 4/2020, Chester, United Kingdom

Major: Software Engineering

Thesis: Solution to the Traveling Salesman Problem with Dijkstra's algorithm and data from Google Maps. Implemented as a road trip planner in the form of a Web App:

TravelBuddy

React, Redux, SCSS, D3.JS
Firebase

Live Link|GitHub|Demo

Computer Science & Technology

I.T.C. B. Belotti

9/2012 - 7/2017, Bergamo, Italy

Tech: PHP, MySQL, VB, JavaScript, JQuery, HTML, CSS

Thesis: E-commerce website for a local italian beauty company with 5k yearly organic traffic to this day:

SvetlaEstetica

HTML, CSS, JQuery, JavaScript
PHP, MySQL

Live Link