Senior Full-Stack Developer | Web & Mobile Systems | Former QA Lead | 10+ years in Tech
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Senior Full-Stack Developer | Web & Mobile Systems
Full-Stack Engineer with 8+ years of experience building reliable, high-performance web and mobile applications for SaaS, e-commerce, and logistics clients. Combines deep expertise in React, Next.js, Node.js, and React Native with a former QA Lead’s discipline to deliver zero-critical-bug releases, 99.97% uptime, and 58% fewer support tickets. Skilled in baking test automation, CI quality gates, and performance optimization into the development lifecycle — not as an afterthought, but as core architecture. Open to remote engineering roles with global product teams.
JavascriptTypescriptPythonC#.NetReactNext.jsNode.jsExpressRESTful APIsReact NativeFlutterGraphQLIonicSQLJestCypressGitServices offered
My software solutions are fully customized, ensuring that your business gets exactly what it needs to stand out in the market
Full-Stack Application Modernization
Migrate legacy web or hybrid mobile apps (Cordova, jQuery, PHP) to modern React/Next.js + Node.js stacks with TypeScript, responsive UIs, and offline-first mobile capabilities — backed by CI-enforced quality gates, Lighthouse optimization, and automated E2E testing.
Mobile-First Product Development
Build or enhance cross-platform mobile applications for field service, logistics, and enterprise workflows using React Native, Flutter, or Cordova, integrated with secure Node.js backends and real-time data synchronization. Deliver offline-first experiences with local caching, conflict resolution, and background sync
Cloud-Native DevOps Enablement
Establish reliable CI/CD pipelines using GitHub Actions, Jenkins, or Azure DevOps, containerize apps with Docker, and enforce quality gates (test coverage ≥90%, Lighthouse ≥85) to enable rapid, zero-defect releases for remote engineering teams.
Quality-Driven Engineering Transformation
Embed test automation (Playwright, Jest, Appium, Detox), shift-left testing, and observability (Sentry, LogRocket) into your development workflow — reducing post-release bugs by 25–40% and accelerating release velocity without compromising reliability.
Cross-Platform UX & Performance Optimization
Audit and optimize web and mobile interfaces across 20+ device/browser combinations, delivering actionable fixes within 24 hours to improve load performance (45% faster), accessibility (WCAG), and cross-platform consistency.
Legacy System Assessment & Cloud Migration
Evaluate outdated monolithic or on-prem systems and deliver a phased migration path to AWS/Azure, using Docker containerization, IaC principles, and modern API architecture — reducing deployment failures by 35% and cutting operational overhead.
Technical Leadership & Delivery Acceleration
Provide hands-on engineering leadership: sprint planning, code quality governance, QA-dev collaboration, and stakeholder alignment — bridging product, QA, and DevOps for SaaS, e-commerce, or logistics clients.
Secure, Scalable Backend Architecture
Design and deploy JWT-secured REST/GraphQL APIs with Node.js, PostgreSQL/MongoDB, and Redis caching — optimized for 500+ concurrent users, real-time data sync, and sub-3s mobile load times on mid-tier devices.
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About me
Full-Stack Engineer with 10+ years of experience building reliable, high-performance web and mobile applications for SaaS, e-commerce, and logistics clients. Combines deep expertise in React, Next.js, Node.js, and React Native with a former QA Lead’s discipline to deliver zero-critical-bug releases, 99.97% uptime, and 58% fewer support tickets. Skilled in baking test automation, CI quality gates, and performance optimization into the development lifecycle — not as an afterthought, but as core architecture. Open to remote engineering roles with global product teams.
Most full-stack developers ship only features, but I focus features that stay shipped — because I have mindset of a former QA Lead: zero tolerance for flaky UIs, untested edge cases, or “works on my machine” surprises.
With full-stack web and mobile development alongside QA lead background, I build robust, user-centric applications that perform under real-world pressure. What makes me apart is baking quality in from Day 1 without bolting it on at the end, so If you’re mining a developer who treats reliability as a core feature (never afterthink), I am ready to hear more about your project.
👍I approach projects with European-vibe attention to detail and American-style execution speed.
10+
10+ years of experience in the technology market30+
More than 30 successful projects delivered90%
90% of our clients return for new projects20+
Over 20 satisfied clients in various sectorsPortfolio
Browse and learn more about my study projects and work carried out
ALLWEBMOBILEQADEVOPS
Firefox - QA Engineering & Full-Stack Support
WEBMOBILEQA
Created at: 29/08/2024Led quality assurance and frontend modernization efforts for Firefox’s global release pipeline, serving 50M+ users. Developed React-based telemetry dashboards to monitor release health in real time and authored Appium/Selenium test scripts covering 15+ critical user flows across iOS and Android. Enforced CI quality gates (≥90% test coverage, ≥85 Lighthouse) that reduced post-release defects by 25% ahead of the landmark Firefox 57 launch.
React.JS
TypeScript
JavaScript
Selenium
Java
Python
Git
Jenkins
Appium
Lighthouse
Accessibility
LuckPet - Full-Stack Web Application
WEBDEVOPS
Created at: 12/12/2024Built a responsive, user-centric e-commerce platform for pet lovers, featuring authentication, persistent cart/favorites, and a loyalty program (LuckCoins). Implemented real-time search, animated UI interactions, and session synchronization across devices using localStorage and Supabase Auth. Optimized performance with lazy loading and CSS animations, achieving 94+ Lighthouse scores on mobile and desktop.
React.JS
Styled Components
Next.js
Redux
HTML5
CSS3
JavaScript
TypeScript
Supabase
Firebase
WalkerIP - Web & Mobile Frontend Engineering
MOBILE
Created at: 09/06/2019Engineered a responsive business services portal compatible across desktop, tablet, and mobile, ensuring consistent UX for legal and IP clients. Conducted device-specific audits on 20+ interfaces using emulators and physical devices, delivering fixes within 24 hours that improved cross-platform consistency by 30%. Integrated dynamic content modules with smooth transitions and accessibility-compliant navigation.
React.JS
TypeScript
Flutter
Mobile
iOS
Android
Tailwind CSS
React Native
HTML5
CSS3
Accessibility
Tapy - Mobile + Web Full-Stack Development
WEBMOBILEDEVOPS
Created at: 02/02/2020Node.js server for using the Inthegra API provided by STRANS from Teresina - PI.
React Native
Node.js
Express
Firebase Crashlytics
Swift
JWT
Appium
Tryotel - Mobile & Web Full-Stack + DevOps
WEBMOBILEQA
Created at: 26/04/2020Delivered a high-performance travel app for worldwide OTA market, featuring real-time flight feeds and booking workflows. Built shared business logic between React web and React Native mobile clients, reducing duplicate effort by 25 hours/week. Containerized backend services with Docker and deployed on AWS, ensuring sub-second API responses during peak load.
React
React Native
Mobile
Android
iOS
JavaScript
Node.js
AWS
Docker
MongoDB
Vushorus - Mobile-First Full-Stack Development
MOBILEWEB
Created at: 24/06/2021Spearheaded development of a Cordova-based mobile app and marketing website for a hotel chain, enabling room/meal bookings and promotional campaigns. Engineered a Node.js backend with JWT authentication and offline-first sync for field agents. Optimized mobile load time by 45% via code-splitting, ensuring sub-3s loads on mid-tier Android devices.
HTML5
CSS3
JavaScript
generic Mobile
Node.js
Express
Jwt
MongoDB
Firebase
Google Cloud
CoolN64 - Mobile App Development & DevOps
MOBILEQA
Created at: 19/04/2021Enhanced an open-source Android N64 emulator with Material Design 2 UI, ARM64 support, and dynamic delivery via Android App Bundle (.aab). Reduced app size and improved performance profiles per game. Managed build pipelines in Android Studio and prepared releases for Google Play Console.
Mobile
Android
iOS
Java
Kotlin
Android
Docker
CI/CD
Git
Infragistics WPF - QA, DevOps & Backend Support
WEBQA
Created at: 05/05/2020Backend of a Node.js server that provides a REST API that allows sharing the smartphone's geolocation to a cloud database maintained by MongoDB.
C#
.Net
Jenkins
Docker
Git
PowerShell
Teknowledge - DevOps & Full-Stack Engineering
WEBDEVOPS
Created at: 05/05/2020Engineered internal full-stack tools for an AI solutions provider, automating defect tracking and client reporting. Built C#/PHP/JavaScript applications for data visualization and workflow management. Maintained Jenkins/Git CI/CD pipelines and containerized legacy systems with Docker, improving environment parity and saving 15+ QA hours weekly.
ReactJS
Expo
C#
PHP
Mysql
Jenkins
Docker
Git
Amazonaws
Experience
An overview of my additional training, relevant certifications and professional trajectory
2006
College: Greek College Delta
Specialty: Computer Networking and Telecommunications
Degree: Associate of Science (A.S.) in Computer Networking and Telecommunications
2008
College: New Bulgarian University
Specialty: Computer Science
Degree: Bachelor of Science (B.S.) in Informatics
2013
Company: Tek Experts
Position: Full-Stack DevOps Engineer
Title: Engineered internal full-stack tools (C#, JavaScript, PHP) for defect tracking and release automation, saving 15+ QA hours/week.
2014
Company: Infragistics Inc
Position: Full-Stack Engineer & QA Integration Lead
Title: Transitioned from DevOps to full-stack development, building React/TypeScript components and Node.js microservices used by 10K+ developers.
2016
Company: Vushorus Inc
Position: Mobile-First Full-Stack Developer
Title: Engineered a Cordova-based mobile app with Node.js backend serving 500+ field agents, featuring offline-first sync and real-time updates.
2017
Company: SoftVision LLC
Position: Full-Stack Engineer (Web & Mobile Integration)
Title: Built React dashboards for Firefox release analytics, integrating telemetry APIs to track defects and test coverage across desktop platforms.
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