Open to opportunities

Stefan Andrei

@stefanandrei

Senior software engineer building scalable full-stack products with Python, FastAPI, React, Next.js, and cloud-native systems.

Romania

Message

What I'm looking for

I’m looking to build product-driven, AI-enabled systems with strong UX, scalable architectures, and rigorous testing/monitoring. I want to own technical design, mentor engineers, and ship maintainable features end-to-end in cloud environments.

I’m a Senior Software Engineer with 10+ years of experience delivering scalable full-stack products using Python, FastAPI, React, Next.js, and cloud-native architecture. I bring a product-focused builder mindset, strong UX awareness, and the ability to turn complex requirements into maintainable software.

Recently, I spearheaded an AI-first presentation editor—architecting Next.js/React/TypeScript and FastAPI capabilities, integrating Azure OpenAI and Google Gemini via LangChain and LlamaIndex, and building 2D graphics modules with SVG. I designed PostgreSQL and PGVector data models for vector embeddings, semantic retrieval, and persistent AI memory, and delivered monitoring/testing workflows with Checkly, Cypress, and Jest.

Earlier, I built a telehealth platform and a financial trading platform spanning event-driven backends, secure integrations, and responsive frontends. I’ve led technical design, mentored junior engineers, and established engineering practices across API design, frontend performance, maintainable architecture, and product-focused delivery.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

AssistWell

Oct 2023 - Present (2 years 9 months)

Spearheaded an AI-first presentation editor, building scalable frontend and backend capabilities with Next.js, React, TypeScript, and FastAPI. Implemented LLM-powered content generation with LangChain and LlamaIndex, interactive SVG-based 2D graphics, vector-backed PostgreSQL/PGVector data models, and automated testing/monitoring workflows.

Software Engineer

Amazon

Aug 2021 - Sep 2023 (2 years 1 month)

Built a scalable telehealth platform using Python, Django, FastAPI, React, and PostgreSQL to support patient services, clinical workflows, and secure digital interactions. Developed event-driven scheduling APIs integrating Kafka and RabbitMQ, implemented OAuth2 integrations, led CI/CD and infrastructure automation with Jenkins, Docker, Terraform, and AWS, and delivered machine-learning chatbot fun

Software Developer

Creatif Agency

Mar 2018 - Jul 2021 (3 years 4 months)

Designed and implemented a financial trading platform using Python, FastAPI, and Hexagonal Architecture to separate domain logic from external infrastructure and integrations. Built microservices, GraphQL interfaces, caching and storage layers, and React-based server-rendered trading dashboards, while automating deployments and validating functionality with Selenium and testing workflows.

Software Developer

Start Up Eurobrand Srl

Jul 2015 - Feb 2018 (2 years 7 months)

Developed patient-management applications using Django and FastAPI with SQLAlchemy, PostgreSQL, JavaScript, and React to support healthcare records and operational workflows. Implemented REST APIs and secure document-processing pipelines with Amazon S3 and AWS Lambda, improved database performance via indexing and query optimization, and built reusable frontend components with authentication and t