Backend API Development
Building and maintaining RESTful APIs with Ruby on Rails and Node.js. TDD with rSpec, FactoryBot, and Vitest. Production experience in healthcare and enterprise environments.
About Me
I am Sam Montalvo Jr
Full-stack software engineer with roots in web development dating to 2012. Core strengths in Rails application development, legacy system modernization, and CI/CD pipeline implementation. Bilingual in English and Spanish.
- Full Name
- Sam Montalvo Jr
- Age
- 34 Years
- Nationality
- American
- Languages
- English, Spanish
- Location
- Chicago, Illinois, USA
- Freelance
- Available
What I Do
Legacy Modernization
Migrating legacy systems to modern stacks — PHP/Laravel to Rails, CRA to Vite, Bootstrap 4 to 5. Emphasis on incremental delivery with zero disruption to production.
CI/CD & DevOps
Jenkins and GitHub Actions pipelines with automated test gates, environment-separated deployments, and AWS integrations across EC2, S3, and SNS.
AI Agent Engineering
Designing multi-agent pipelines with LangChain, LangGraph, CrewAI, and Anthropic's Model Context Protocol. Practical orchestration delivered through client work and personal tooling.
Full-Stack Feature Delivery
End-to-end feature ownership across Rails backends, React frontends, and Hotwire-powered interfaces. Experienced across full delivery cycles from API design to production hotfix.
Database & Infrastructure
PostgreSQL schema design, Redis caching, and AWS-backed data pipelines. Environment-separated storage with S3 and strict access control across staging and production.