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Volodymyr P. — Senior Full Stack Engineer from Bulgaria

Volodymyr P.

Senior Full Stack Engineer

Bulgaria 6+ years
Open to offersNew to Platform
Languages
EnglishUkrainianRussian
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About

Vladimir P. is a Senior Full Stack Engineer & Backend Architect with 9+ years of professional experience building high-performance web applications, real-time IoT systems, and scalable APIs.


My core value is extreme autonomy. I take full ownership of the technical lifecycle—from database schema design and writing clean backend code to containerization, setting up CI/CD pipelines, and deploying to the cloud.


🚀 KEY METRICS & TRUST:

* 12,900+ logged hours on Upwork with a 100% Job Success Score (Top Rated Plus).

* Delivered 30+ commercial applications from MVP to release.

* Creator of DevSense.work – a technical media portal focusing on database scaling, API gateways, and advanced backend engineering.


💻 TECHNICAL STACK:

* Backend & Architecture: PHP (Laravel, Symfony), Node.js (NestJS, Express), TypeScript, REST APIs, WebSockets (Ratchet, Socket.io), gRPC, microservices.

* Databases & Scaling: PostgreSQL, MySQL, Redis. Proficient in database sharding, composite indexing, deadlock resolution, and query profiling (EXPLAIN).

* DevOps & Infrastructure: Docker, Nginx, Linux CLI, CI/CD (GitHub Actions, GitLab CI), AWS (EC2, S3, Cognito, MediaConvert), DigitalOcean.

* Applied AI: GDPR-compliant RAG architectures (pgvector, Qdrant), OpenAI API, local LLM deployments (Llama/Mistral).

* Frontend: Vue.js (2/3, Composition API), Tailwind CSS.


💼 SELECTED PROJECT MILESTONES:

* Umiigo (Scooter Sharing): Designed an IoT backend utilizing Laravel, MQTT (Mosquitto/Workerman), and WebSockets, reducing physical lock release latency to <1.5s.

* TrueRCM (Telehealth & VoIP): Built a secure, HIPAA-compliant platform. Integrated Twilio Video and implemented Apple VoIP Pushes (APNs) + FCM to trigger native-like incoming calls on sleeping mobile devices.

* Nexa (LegalTech AI): Architected a GDPR-compliant RAG assistant. Migrated US-hosted LLM API calls to local EU-hosted private models, building a custom vector storage (pgvector/Qdrant) solution.


I thrive in async-first, product-driven teams where actions speak louder than meetings. I am fluent in English (written technical B1, daily communication) and native in Russian and Ukrainian.

Experience

  • Tech Lead & Full Stack Architect

    CookieDev · 2018 — Present
    Acted as Technical Architect and Lead Developer, directing cross-functional teams (up to 15+ developers) and successfully delivering 20+ commercial applications for US and EU markets. Key Achievements: - Designed an IoT scooter-sharing backend using Laravel, MQTT, and WebSockets, reducing lock release latency to <1.5s. - Built a secure, HIPAA-compliant telehealth platform, integrating Twilio Video and implementing Apple VoIP Pushes (APNs) and FCM for native-like calls on sleeping mobile devices. - Architected a GDPR-compliant LegalTech AI assistant, creating a custom RAG pipeline using Qdrant vector database and Mistral AI. - Configured PgBouncer and ProxySQL for high-load NestJS/Laravel applications, reducing database CPU

  • Full Stack Web Developer

    PanDeveloper · 2018 — 2018
    Developed and maintained e-commerce and real estate web applications with a focus on robust backend logic and API integrations. Key Achievements: - Integrated multi-currency payment gateways (Stripe & PayPal) with secure webhook validation. - Created clean RESTful APIs and connected responsive frontend dashboards using JavaScript and Vue.js/jQuery. - Optimized database schemas and executed SQL query profiling to improve page load speed by 25%.