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I am a full-stack engineer with 10+ years building scalable SaaS and real-time web applications. I excel in multi-tenant design, authentication (JWT/OAuth), billing (Stripe), and cloud deployment. I use React, Node.js, and TypeScript to ship production systems with live dashboards, background jobs, and clear APIs. My focus is taking products from idea to scalable, secure, and maintainable backend and frontend. I focus on delivering production-ready backends and responsive frontends, leveraging WebSocket-driven real-time updates, live dashboards, and robust authentication and payments integrations. I aim to take products from idea to scalable, secure, and maintainable backend and frontend using modern stacks like React, Node.js, and TypeScript.…I am a full-stack engineer with 10+ years building scalable SaaS and real-time web applications. I excel in multi-tenant design, authentication (JWT/OAuth), billing (Stripe), and cloud deployment. I use React, Node.js, and TypeScript to ship production systems with live dashboards, background jobs, and clear APIs. My focus is taking products from idea to scalable, secure, and maintainable backend and frontend. I focus on delivering production-ready backends and responsive frontends, leveraging WebSocket-driven real-time updates, live dashboards, and robust authentication and payments integrations. I aim to take products from idea to scalable, secure, and maintainable backend and frontend using modern stacks like React, Node.js, and TypeScript.

Pavel Qi-yi Nefir

Full Stack Developer, Web Developer, Back-End Developer, +2

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I am a full-stack engineer with 10+ years building scalable SaaS and real-time web applications. I excel in multi-tenant design, authentication (JWT/OAuth), billing (Stripe), and cloud deployment. I use React, Node.js, and TypeScript to ship production systems with live dashboards, background jobs, and clear APIs. My focus is taking products from idea to scalable, secure, and maintainable backend and frontend. I focus on delivering production-ready backends and responsive frontends, leveraging WebSocket-driven real-time updates, live dashboards, and robust authentication and payments integrations. I aim to take products from idea to scalable, secure, and maintainable backend and frontend using modern stacks like React, Node.js, and TypeScript.…I am a full-stack engineer with 10+ years building scalable SaaS and real-time web applications. I excel in multi-tenant design, authentication (JWT/OAuth), billing (Stripe), and cloud deployment. I use React, Node.js, and TypeScript to ship production systems with live dashboards, background jobs, and clear APIs. My focus is taking products from idea to scalable, secure, and maintainable backend and frontend. I focus on delivering production-ready backends and responsive frontends, leveraging WebSocket-driven real-time updates, live dashboards, and robust authentication and payments integrations. I aim to take products from idea to scalable, secure, and maintainable backend and frontend using modern stacks like React, Node.js, and TypeScript.

Available to hire

I am a full-stack engineer with 10+ years building scalable SaaS and real-time web applications. I excel in multi-tenant design, authentication (JWT/OAuth), billing (Stripe), and cloud deployment. I use React, Node.js, and TypeScript to ship production systems with live dashboards, background jobs, and clear APIs. My focus is taking products from idea to scalable, secure, and maintainable backend and frontend.

I focus on delivering production-ready backends and responsive frontends, leveraging WebSocket-driven real-time updates, live dashboards, and robust authentication and payments integrations. I aim to take products from idea to scalable, secure, and maintainable backend and frontend using modern stacks like React, Node.js, and TypeScript.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Advanced

Romanian, Moldavian, Moldovan

Advanced

Chinese

Advanced

Work Experience

Freelance Full Stack Developer at Contra (commission-free freelance network)

January 1, 2025 - Present

Full-Stack Engineer specializing in Scalable SaaS & Real-Time Applications; delivering production-ready backends and Stripe-based billing for startups and product teams. Technical focus: WebSocket-driven real-time updates, push notifications, and in-app real-time chat; mobile app as primary location source with live dashboard sync. Stack: React Native, React, Node.js, Supabase, Firebase. Shipped SaaS applications using AI-assisted tooling (Cursor, Replit) for rapid delivery while keeping production quality and clean architecture.

Freelance Full Stack Developer at Upwork

November 1, 2020 - January 1, 2025

Shipped 10+ web and mobile applications end-to-end using React, React Native, Node.js, and Firebase, with emphasis on scalability, auth, and real-time behavior. Built scalable backends with RESTful APIs, background jobs, and integrations (Stripe, FedEx/USPS/UPS, cloud storage). Implemented real-time and event-driven features: live dashboards, WebSocket-based tracking, and collaborative flows. Designed auth and access control (JWT, role-based permissions, multi-tenant –friendly patterns) and payment flows (Stripe, PayPal, Payoneer, bank transfers). Managed delivery with Jira, Git, and Agile; owned client communication and timelines.

Founding Developer at The GRN LLC

February 1, 2023 - December 1, 2024

Co-built a custom packaging SaaS and mobile app with the CEO; owned architecture and implementation. Backend: Node.js, Express, MongoDB; REST API for strains, packaging configs, and user-specific designs. Frontend: React, Tailwind; responsive UI and clear UX from selection to checkout. Implemented secure ordering, payment handling, and data protection; iterated on goals and feedback in tight collaboration with leadership.

Full Stack Developer at Track-Platform (GPS tracking)

February 1, 2022 - December 1, 2022

Real-time system: React Native app + WordPress admin for live GPS tracking, fleet dashboard, and asset monitoring. Features: live location updates, geofencing and alerts, trip history and reports, role-based auth, multi-device support. Delivered a production-ready mobile and web experience with focus on reliability and clear UX.

Full Stack Developer at Exe Software

September 1, 2017 - December 1, 2020

Progressed from Software Developer Intern to Full Stack Developer; built multiple client- facing web and mobile products. Worked with modern JavaScript/TypeScript, React, Node.js; emphasis on performance, scalability, and maintainability. Contributed to data-heavy and dashboard-oriented projects; collaborated with clients and internal teams in an Agile setup.