Open to opportunities

Aaron Lee

@aaronlee

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Senior full-stack engineer building scalable SaaS, AI, and cloud-native platforms.

Ireland

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What I'm looking for

I’m looking for a senior role where I can lead end-to-end delivery of AI-powered SaaS and distributed systems, partner with product teams, and drive measurable improvements in performance, reliability, and operational efficiency.

I’m a Senior Software Engineer with 10+ years building scalable SaaS platforms, AI-powered applications, and cloud-native systems across enterprise and high-growth teams.

I specialize in TypeScript, React, Next.js, Node.js, Python, AWS, and modern distributed architectures, with a focus on end-to-end delivery—from architecture through release.

At MistralAI, I led development of AI-powered enterprise products and cloud-native services, architecting RAG-based search and knowledge discovery that reduced retrieval time by 70% and building microservices that supported millions of AI inference requests per month.

Previously at HubSpot and Meta (Facebook), I delivered customer-facing platforms, improved performance (including a 55% reduction in page load times), optimized data stores for scale, and migrated systems toward more reliable, observable architectures. I also mentor engineers and help establish engineering standards for scalable frontend and backend development.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Mistral AI

Aug 2023 - Present (2 years 10 months)

Architected and developed an AI-powered search and knowledge discovery platform using RAG, reducing information retrieval time by 70%. Built scalable TypeScript and Python microservices supporting millions of AI inference requests per month and improved search relevance by 45% with Elasticsearch and embedding models.

TypeScript Python Retrieval Augmented Generation (RAG)Elasticsearch OpenAI fastAPI AWS Kubernetes Microservices

Senior Full Stack Engineer

HubSpot

Mar 2021 - Jul 2023 (2 years 4 months)

Led development of critical SaaS platform features serving 180,000+ business customers worldwide. Improved customer engagement by 30% and reduced page load times by 55% while building GraphQL/REST APIs handling 20M+ requests daily.