Hello, I'm Pavlin
I'm a Tech Lead and Senior Full Stack Engineer with 9 years of experience building and scaling web applications, browser extensions, and web services used by millions of users.
I lead architecture, modernization, and product delivery across frontend and backend systems, with a focus on maintainability, performance, and practical AI-assisted development workflows.
Career
Tech Lead - AdAvoid Ltd.
2024 - Present
- Led the complete rewrite of AdBlocker Ultimate's cross-browser extension, consolidating browser-specific implementations into a unified codebase that reduced maintenance effort by 50% and enabled 2x faster feature delivery.
- Integrated a new industry-leading filtering engine, improving filtering capabilities and long-term maintainability.
- Migrated millions of users across supported browsers with no service interruption.
- Mentored developers through architecture reviews, code reviews, and technical guidance.
- Architected a serverless filter compilation pipeline using AWS Lambda, S3, and Cloudflare CDN for automated filter generation, patching, and global distribution.
Senior Full Stack Engineer - AdAvoid Ltd.
2022 - 2024
- Developed and maintained the core web platform powering authentication, subscription management, purchase flow, and payment processing for the AdBlocker Ultimate ecosystem.
- Delivered the Manifest V3 migration for Chrome and Edge, preserving platform compatibility ahead of browser ecosystem changes.
- Built the AdAvoid Ltd. corporate website from the ground up.
- Led a complete architectural redesign of CoolStart, eliminating server-side dependencies, reducing shipped application size by 63%, and decreasing startup time from 1-5 seconds to under 100 milliseconds.
Full Stack Engineer - AdAvoid Ltd.
2020 - 2022
- Built APIs and internal tooling for license activation, subscription management, and browser extension communication.
- Developed an automated license provisioning system for business partners using OAuth and JWT.
- Collaborated across frontend and backend systems for browser extensions and supporting web services.
- Co-built and launched WebDefender, a security browser extension and web app with 20K+ users, including malicious website blocking, extension risk analysis, breach monitoring, and external security service integrations.
Back-End Developer - 2Create
2018 - 2020
- Built custom WordPress solutions for commercial clients.
- Designed reusable plugins and themes that reduced implementation effort across multiple projects.
- Managed deployments, production infrastructure, and ongoing client support.
- Contributed to 100+ software projects, from small feature updates to full-scale product development.
Web Developer Intern - DG Soft
July 2017 - November 2017
- Contributed to backend PHP development on commercial applications.
- Resolved production issues and improved application stability within an established engineering team.
Projects
adblockultimate.net
Web platform serving 50M+ users across the AdBlocker Ultimate ecosystem.
Powers user authentication, subscription management, purchase flows, and payment processing.
Includes the user dashboard and partner-facing APIs for license and subscription integrations.
AdBlocker Ultimate Cross-Browser Extension
Cross-browser ad-blocking extension used by 4M+ users across Chrome, Firefox, Edge, and other supported browsers.
It blocks ads, trackers, and malicious domains with a strict no-whitelist policy.
One of the flagship products in the AdBlocker Ultimate ecosystem, built for performance and maintainability across multiple browser platforms.
adavoid.org
Corporate website for AdAvoid Ltd., the company behind AdBlocker Ultimate.
Serves as the public-facing platform for company information, product details, and online presence.
Built with Next.js for a fast, modern experience.
WebDefender
Security browser extension and web app with 20K+ users.
Protects against malicious websites, risky browser extensions, and data breaches.
Integrates with external security services for real-time threat detection and monitoring.
CoolStart
Chrome extension that replaces the new tab page with a customizable dashboard.
Built with a lightweight client-side architecture focused on fast startup and minimal resource usage.
Designed for a smooth daily browsing experience.
Skills
Cursor
TypeScript
JavaScript
Node.js
PHP
MySQL
REST APIs
WebSockets
React
Preact
Next.js
HTML
CSS
SASS
AWS
Cloudflare
CI/CD
Git
Webpack
Vite
pnpm
Babel
ESLint
Prettier
Agentic Coding
Context Engineering
Prompt Engineering