Open to opportunities

Petru Constantin

@petruconstantin

Senior Full Stack AI/ML Engineer at JohnCube building production SaaS with LLMs and RAG.

At JohnCube, I develop production SaaS and web applications with Generative AI, LLMs, AI agents, and RAG. I build workflows that combine vector search, REST APIs, and PostgreSQL to automate business processes and reduce manual effort.

Previously, at SDLC Corp, I developed enterprise applications and event-driven services for international clients. At Code Ocean @ Cornell University, I assisted with web applications and platform interfaces that help researchers run and manage computational workflows.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack & AI/ML Engineer

Current

JohnCube

Aug 2021 - Present (5 years 2 months)

Develop and integrate Generative AI, LLMs, AI agents, RAG, embeddings, and semantic search using LangChain and LangGraph into production SaaS and web applications. Lead end-to-end development of AI-enabled SaaS and web applications, designing system architecture, writing backend code, and deploying via CI/CD pipelines.

Full Stack Engineer

SDLC Corp

Sep 2018 - Aug 2021 (2 years 11 months)

Developed and delivered scalable enterprise web applications for international clients using React, Angular, TypeScript, Node.js, and Python. Designed and implemented scalable RESTful APIs and event-driven services with tools such as FastAPI and Kafka.

React Angular TypeScript NodeJS Python fastAPI Kafka PostgreSQL MySQL MongoDB Docker Jenkins Gitlab CI Jest Mocha Cypress Agile Scrum

Software Engineer Intern

Code Ocean @ Cornell University

Jul 2016 - Mar 2018 (1 year 8 months)

Assisted in developing and maintaining responsive web applications and cloud-based platform interfaces with JavaScript, React, HTML5, CSS3, and Node.js. Built and enhanced reusable frontend components and contributed to Node.js backend services and REST API integrations.