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Available for new projects

Senior Software
Developer & Team Lead

I build web apps, mobile apps, and cloud infrastructure for startups and businesses — then stick around to scale them.

Vlad Constantinescu

5+

years experience

Top 3%

on Upwork

2021

Active since

Full-stack

web, mobile, cloud

What I Do

Services & Expertise

01

Full-Stack Web

Complete web applications with React, Next.js, and Node.js. From marketing sites to complex SaaS platforms — frontend, backend, and everything between.

02

Mobile Development

iOS and Android apps with React Native. One codebase, native look and feel, faster time to market.

03

Backend & Architecture

APIs and services with NestJS, GraphQL, and SQL. Built to handle growth without rewriting later.

04

DevOps & Cloud

AWS infrastructure, Docker, automated deployments. Your app runs reliably from day one.

05

Data Science & AI

Machine learning models, data pipelines, and AI features integrated into your product. Built with Python, ready for production.

Stack

TypeScript / React / Next.js / React Native / Node.js / NestJS / Python / GraphQL / SQL / AWS / Docker

Background

Experience

Freelance · 5+ years

Senior Full-Stack Developer

Sole developer or tech lead on 30+ projects — taking products from idea to launch across web, mobile, and cloud.

Cross-functional teams

Team Lead

Leading small dev teams: code reviews, architecture decisions, sprint planning, and making sure we ship on time.

Python · ML · Analytics

Data Science Background

Trained in data science and machine learning. I bring analytical rigor and AI capabilities into the products I build.

Top 3% · Since 2021

Top Rated Plus on Upwork

Top 3% of freelancers on Upwork. Dozens of 5-star reviews across fintech, e-commerce, IoT, and SaaS projects.

Let's Work Together

Start a project.

Tell me what you're building. I'll let you know how I can help — usually within 24 hours.

Get in Touch