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I'm Aaron Marcelo, a Senior Full-Stack Engineer with 9+ years of experience building modern JavaScript-driven applications. I specialize in Node.js backends and React/Next.js frontends, and I have also worked with React Native mobile apps. I integrate Python and Ruby on Rails where needed, design scalable API architectures, and deliver production-ready SaaS and mobile solutions. I'm passionate about clean code, real-time features, and AI-powered tooling that improves developer productivity.…I'm Aaron Marcelo, a Senior Full-Stack Engineer with 9+ years of experience building modern JavaScript-driven applications. I specialize in Node.js backends and React/Next.js frontends, and I have also worked with React Native mobile apps. I integrate Python and Ruby on Rails where needed, design scalable API architectures, and deliver production-ready SaaS and mobile solutions. I'm passionate about clean code, real-time features, and AI-powered tooling that improves developer productivity.

Aaron Marcelo

AI Engineer, DevOps Developer, Full Stack Developer, +5

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I'm Aaron Marcelo, a Senior Full-Stack Engineer with 9+ years of experience building modern JavaScript-driven applications. I specialize in Node.js backends and React/Next.js frontends, and I have also worked with React Native mobile apps. I integrate Python and Ruby on Rails where needed, design scalable API architectures, and deliver production-ready SaaS and mobile solutions. I'm passionate about clean code, real-time features, and AI-powered tooling that improves developer productivity.…I'm Aaron Marcelo, a Senior Full-Stack Engineer with 9+ years of experience building modern JavaScript-driven applications. I specialize in Node.js backends and React/Next.js frontends, and I have also worked with React Native mobile apps. I integrate Python and Ruby on Rails where needed, design scalable API architectures, and deliver production-ready SaaS and mobile solutions. I'm passionate about clean code, real-time features, and AI-powered tooling that improves developer productivity.

Available to hire

I’m Aaron Marcelo, a Senior Full-Stack Engineer with 9+ years of experience building modern JavaScript-driven applications. I specialize in Node.js backends and React/Next.js frontends, and I have also worked with React Native mobile apps.

I integrate Python and Ruby on Rails where needed, design scalable API architectures, and deliver production-ready SaaS and mobile solutions. I’m passionate about clean code, real-time features, and AI-powered tooling that improves developer productivity.

Skills

Experience Level

Expert

Expert

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Expert

Language

English

Fluent

Work Experience

Senior Software Engineer at Duxre

January 1, 2022 - Present

Built Node.js backend services with Express/Fastify-style architecture, handling async workflows, background jobs, and high-throughput APIs. Led development of React/Next.js web frontends and React Native mobile apps for multi-tenant SaaS, implementing responsive UIs and offline-first patterns. Integrated Python-based services for AI-assisted processing, analytics, and LLM-driven features. Maintained and extended legacy Ruby on Rails services with incremental enhancements. Designed and deployed AI-powered systems including LLM integration, RAG pipelines, vector search, and real-time streaming responses. Deployed services via Docker and CI/CD pipelines on AWS and Azure.

Senior Software Engineer at SpinSci Technologies LLC

June 1, 2020 - December 1, 2021

Developed Node.js APIs for high-volume health care SaaS, processing millions of records daily. Built React and React Native frontends, enabling mobile access for health care staff with offline caching and push notifications. Implemented secure multi-tenant architectures, transactional integrity, and zero-downtime database migrations. Implemented analytics and reporting workflows. Monitored backend performance and reliability using structured logging, profiling, and load testing. Contributed to Python-based microservices for data enrichment and analytics.

Software Engineer at Amazon

May 1, 2017 - May 1, 2020

Joined the Amazon Seller Central team, building and maintaining full-stack applications supporting seller tools and e-commerce operations. Implemented microservices for core Seller Central features enabling independent deployment, scaling, and fault isolation using React and Node.js. Built reusable React components and connected them to backend APIs. Implemented real-time dashboards and WebSocket-based features to monitor seller activity, inventory updates, and notifications. Worked with PostgreSQL, Redis, and MongoDB for transactional data, caching, and analytics.