Mihail Gabriel Subtirelu

Senior Full-Stack Engineer

Full-stack engineer with 13+ years and a strong product mindset — scalable platforms and real-time applications from concept to production.

I like making apps that people actually enjoy using. I spend a lot of time on how things look and feel—small details, smooth interactions, and simple flows—because that's the part I enjoy the most. I work with React and Next.js on the frontend, but I also handle the backend and everything around it. I've built things in different areas like healthcare, transportation, retail and crypto. Over the past few years, I’ve worked on different AI integrations in real-time systems, especially ones that use chat or voice. I also think about how things will grow over time—keeping the code simple in the beginning, but ready to handle more later. I work fast and can turn an idea into a working prototype quickly, so you can try it out early instead of just talking about it.

13+ years in software engineering
Founder / CTO on multiple products
UI/UX-focused full-stack delivery

Experience

Where most time goes now

Freelance product work end to end — architecture, delivery, and polished frontend UX for client teams.

Webtron Future Solutions

Oct 2016 — Present

Owner — Senior Full-Stack Developer · Freelance · Remote

End-to-end product work for clients — architecture and delivery with special attention to frontend UX, integrations, and shipping quickly.

SaaS and integrations across industries; MVP through production.
Stacks include React, Next.js, Node, NestJS, Go, React Native, AWS, and Docker.
Automation and third-party integrations — Stripe, analytics, messaging, and LLM-assisted workflows where they fit.

TypeScript
React
Next.js
Node.js
Go
OpenAI
AWS
React Native

Background

Earlier product and leadership roles

Shorter stops that shaped how I think about systems, teams, and delivery.

Avochat

Nov 2020 — Jul 2022

Co-Founder & Full-Stack Developer · Remote

Co-founded a real-time platform for lawyers and clients — messaging, monetization, and secure document workflows.

Built chat-based monetization with payments in conversation; secure file sharing with paywall access control.
Full CMS for lawyers: client and task management, file storage, and messaging.
Real-time layer with WebSockets; notifications via Firebase; Stripe including Express Connect for provider payouts.
Backend on Strapi with AWS.

React
Next.js
WebSockets
Node.js
Strapi
AWS
Firebase
Stripe

Wyndy

Mar 2021 — Jan 2023

Senior Frontend Engineer · USA

Frontend ownership on a high-traffic product with Rust-backed APIs and React Native mobile surfaces.

Developed and maintained a high-traffic platform serving thousands of users.
Scalable, performant React frontends; collaboration with Rust backend teams for API integrations.
Enhanced React Native mobile apps; improved performance, maintainability, and developer experience.

React
Next.js
Rust
Node.js
AWS
PostgreSQL

Recomedica (Add Health Company)

Jan 2018 — Mar 2022

Co-Founder & CTO · Bucharest

Healthcare second opinions from volunteer access to premium multi-disciplinary care — full product and infra ownership.

Co-founded a digital healthcare platform for medical second opinions and patient support.
Recomedica Free: second-opinion platform connecting patients with volunteer doctors; early COVID-19 home monitoring and guidance in Romania.
Recomedica PRO: premium multi-disciplinary second opinions, structured patient journeys, multi-layer doctor–patient collaboration, secure records, and async flows.
Full-stack ownership: Node.js and Strapi APIs, AWS infrastructure, Stripe payments, product lifecycle from idea to production with clinical stakeholders.

Node.js
Strapi
AWS
React
TypeScript
NoSQL
Docker
Stripe

Metrosystems

Mar 2018 — 2020

Senior Frontend Developer · Bucharest

Enterprise React and Redux systems — clear architecture, performance, and tight coordination with backend teams.

Led frontend architecture for enterprise applications.
Scalable UI with React and Redux; performance and modular structure.
Close collaboration with backend teams.

React
Next.js
Tailwind CSS
Node.js
GCP
Express
NestJS
Docker
PostgreSQL

Rinftech

Oct 2016 — Mar 2018

Senior Frontend Developer · Bucharest

React delivery with emphasis on UI performance, structure, and maintainability.

React applications with a focus on UI performance and maintainability.
Contributed to frontend architecture and technical decisions.

React
Node.js
NestJS
Docker
PostgreSQL

DeviceHub / OpenFleetLabs

Mar 2016 — Oct 2016

Senior Frontend / Full-Stack Engineer · Bucharest

IoT and public transit ticketing — hardware-linked validation, POS, vending UIs, and live operator tooling.

Part of a five-engineer team building IoT and transportation systems; DeviceHub for device management and real-time monitoring.
Government contract: full public transport monitoring and ticketing for ETA Bus (Râmnicu Vâlcea).
Ticket validation in buses with hardware-integrated validators; POS for subscriptions with card writers, printers, and ID scanners; ticket vending machine UI (Electron + React) with C++ services for payments and hardware queues.
Real-time dashboards for operations; work across frontend, backend, and hardware integration.

React
Electron
Node.js
Python
C++
MySQL
Docker

More professional historyPrevious roles that I took between 2011–2016

WowApp

Feb 2016

Senior Frontend Developer · Bucharest

Short engagement shipping features on a large-scale social platform under tight delivery pressure.

Delivered features for a large-scale social platform.
Worked in a fast-paced, high-pressure environment.

React
CoffeeScript

Ari Matrix

Sep 2015 — Feb 2016

Senior Frontend / Full-Stack Developer · Bucharest

AriLove matchmaking product — deep questionnaires, psychology-backed scoring, and end-to-end delivery.

Six-person engineering team; platform built from scratch across frontend, backend, and architecture.
Complex questionnaire system (300+ items) with psychologists defining methodology and scoring.
High-accuracy matchmaking flows (80%+ compatibility scoring) with strong UX for long forms.
Ownership across APIs, architecture, and product design discussions.

JavaScript
React
Node.js
HTML5
CSS3
REST APIs

Kalon Global Group

Nov 2014 — Sep 2015

Frontend Developer · Bucharest

Enterprise web applications — reusable UI, prototypes, and partnering with backend on APIs.

Scalable frontend architecture for enterprise web applications.
Reusable components and better maintainability across projects.
Rapid prototypes moved into production; tight collaboration on APIs and data flows.
Improved development workflows and tooling.

JavaScript
React
SCSS
Node.js
Webpack
Babel

XL Team

Aug 2014 — Nov 2014

Frontend Developer · Bucharest

Client work end to end — design participation through deployment.

Multiple client projects from concept to deployment.
Product design and development phases.
Responsive interfaces tuned for performance; varied stacks per client.

JavaScript
HTML5
CSS3
SCSS
Node.js
Backbone.js
Gulp.js
WordPress
MongoDB
MySQL

Digital Star (Leo Burnett)

Aug 2013 — Jul 2014

Senior Web Developer · Bucharest

Interactive campaigns and Facebook marketing apps — agency deadlines and high-visibility launches.

Interactive web apps and Facebook-based marketing experiences.
Contributed to award-winning digital campaigns for major brands.
Collaboration with design and marketing; strict performance and deadline pressure.
Agency recognized as Best Agency of the Year (2014).

JavaScript
HTML5
CSS3
SCSS
LESS
Node.js
Gulp.js
WordPress
CodeIgniter
jQuery
Facebook SDK

Romnet Creative

Mar 2013 — Aug 2013

Web Developer · Bucharest

Full-stack and CMS builds for clients across industries.

Full-stack applications tailored to varied client needs.
Technology choices aligned to business constraints.
CMS and custom PHP applications; maintainable delivery.

PHP
MySQL
JavaScript
HTML5
CSS3
WordPress
CodeIgniter
OpenCart
CakePHP
jQuery

GCNTV.net

Jul 2012 — Mar 2013

Web Developer · Remote / US market

Streaming product for US audiences — payments, performance, and a lightweight custom PHP framework.

Video streaming platform designed and built from scratch.
Secure payments via First Data; scalability for high traffic.
Custom PHP framework for speed and flexibility; video delivery and backend tuning.

PHP
MySQL
JavaScript
CSS
CakePHP
jQuery
First Data

Dezibel Media

Jun 2012 — Jul 2012

Web Developer · Bucharest

eCommerce builds, legacy PHP maintenance, and client deadlines.

eCommerce and custom PHP applications.
Legacy maintenance with security and performance improvements.
Fast turnaround for multiple clients.

PHP
MySQL
JavaScript
CSS
OpenCart
osCommerce
jQuery

Ipsos Interactive Services

Jun 2011 — Jun 2012

Frontend Developer & QA Engineer · Bucharest

Global survey UIs — cross-browser quality, accurate logic, and research-grade reliability.

Interactive online surveys for worldwide research programs.
Cross-browser compatibility and high data accuracy.
QA of complex survey logic; collaboration with international teams.
Performance and UX improvements on data-collection platforms.

JavaScript
HTML
CSS
jQuery
ConfirmIT

Stack

My skills

Frontend

TypeScript
JavaScript
React
Next.js
React Native
HTML & CSS
Tailwind CSS
Figma

Backend & AI

Node.js
NestJS
Directus
Python
Go
REST & GraphQL
LLMs & agents

Data & cloud

PostgreSQL
MongoDB
MySQL
AWS
Docker
CI/CD

Integrations

Stripe
Twilio
LiveKit
OpenAI
ElevenLabs
Retell

Education & languages

Formal study and working languages

Education

Romanian-American University
- Computer Science & Management — 2008–2011
- Law — 2008–2012
"Nicolae Iorga" National College
- Computer Science — 2004–2008

Languages

RomanianNative
EnglishProfessional (C1)
FrenchBasic