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Sorin Matei

@sorinmatei

Fullstack Developer at Contractor, building React and Node.js apps, including an AI-powered music and wellness platform.

Romania

Message

At Contractor, I’ve worked on Definia, an AI-powered music and wellness platform. I developed its React Native mobile app and supported the Node.js backend services for personalized experiences across focus, training, recovery, rest, health tracking, and user feedback.

I’ve also developed AI-powered products, including chatbot functionality for Real Page Inc. and a consultancy matching platform for Deloitte. My work included connecting Node.js APIs and Azure Functions with OpenAI, and developing React applications and REST APIs.

For MAS Athlete, I developed the coaches’ React web app and players’ React Native app, handling architecture, deployment to AWS, maintenance, and new features. Across other projects, I’ve developed web and mobile interfaces and backend APIs for clients including Carbmee, BP, BCA Buyer, Sonepar, and Cherrynet.

Experience

Work history, roles, and key accomplishments

Current

Fullstack Developer

Current

Definia

Jun 2019 - Present (7 years 4 months)

Developed the mobile application and backend infrastructure for an AI-powered music and wellness platform, including features for focus, training, recovery, rest, health tracking, and real-time user feedback.

React React Native NodeJS AWS EC2 Amazon SNS S3 PostgreSQL

Developer

Sonepar

Worked on UI for the Large Purchases & Service team, implementing GraphQL queries and mutations, and enhancing app interactivity and responsiveness.

TypeScript React NX Workspaces GraphQL Redux React Testing Library Docker Azure DevOps

Developer

Deloitte

Developed NodeJS APIs and React web application for an AI-powered consultancy matching platform, implementing RESTful endpoints and integrating backend services with the frontend.

TypeScript React NodeJS Azure Azure App Service Azure Functions Azure Storage Azure DevOps REST APIs

React/NodeJS Developer

Real Page Inc.

Worked on AI chatbots for clients to get information about payment processes, case resolution, and legal matters. Developed Azure function Node APIs connected to Salesforce and OpenAI, and implemented fast answers functionality.

TypeScript React React Native NodeJS Prisma PostgreSQL OpenAI API Twilio Conversational AI Lang Chain Azure DevOps Azure Functions Python

Developer

Developed UI and API for an EV charging stations mobile app, including scripts for data manipulation and report generation.

TypeScript React Native React NodeJS AWS Lambda Athena DynamoDB Kinesis S3 Cloudwatch GraphQL Docker WebSockets Python

Developer

Carbmee

Developed a web app for tracking carbon footprint, creating reports, and ensuring compliance with EU regulations. Built the NestJS API and integrated with PostgreSQL using MikroORM.

TypeScript React React Native NodeJS NestJS MikroORM PostgreSQL AWS Docker

Developer

Cherrynet

Developed UI for an accounting web app that allows companies to send and receive checks and pay invoices without using their bank account directly.

TypeScript React React Native GraphQL MobX

Developer

MAS Athlete

Developed a players' state management app for coaches from start to finish, including a React web app for coaches and a React Native mobile app for players, with deployment to AWS.