Description

I help companies ship and scale production-grade Rails SaaS: secure multi-tenancy, reliable billing, fast databases, and smooth deployments.

With 15+ years of building web products (Ruby on Rails + Python) and a Master’s in Data Science, I combine hands-on engineering with a pragmatic product mindset. I’m comfortable joining a team to deliver features or stepping in when the app needs a senior pass to become stable, secure, and ready to grow.

What I’m typically hired for

SaaS readiness audits: multi-tenant security, authorization boundaries (Pundit), background jobs (Sidekiq), data access patterns, and production risks

Billing & subscriptions: Stripe (payments/subscriptions/webhooks/idempotency) and Lago for invoices/subscriptions, including real-world edge cases

PostgreSQL performance: query optimization, indexing strategy, N+1 removal, and endpoint latency improvements

Cloud & deployments: AWS (S3, IAM/secrets patterns), Docker, CI/CD, Heroku pipelines

I like working in small, focused iterations: audit → plan → quick wins → solid delivery, with clear priorities and measurable results.

Languages

Spanish
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

Eagle Alpha
Senior Software Engineer
January 2014 - Today (12 years and 5 months)
• - Lead the architectural design of the primary Ruby on Rails codebase.
• - Drive development of our core applications using the latest Ruby on Rails, Stimulus, Turbo, and Tailwind features to build intuitive user experiences and maintainable codebases.
• - Expand AI integrations across customer-facing products, including production-deployed LLMs and ongoing development using tool-use and agentic LLM patterns.
• - Collaborate closely with engineering peers for debugging, code reviews. Share learnings with the team and contribute to mentoring initiatives.
• - Deploy and maintain multi-cloud infrastructure across staging and production environments.
• - Built scalable APIs in Ruby on Rails and Python for financial metadata services.
• - Designed cloud architecture on AWS with serverless Lambdas.
• - Integrated Tableau, Superset, Lago and Stripe into our codebase.
• - Stack: Ruby on Rails, Python, AWS, PostgreSQL, Docker, React, JavaScript, RSpec
Ruby on Rails Python AWS Fargate Elasticsearch Stripe
Ideas4all.com
Software Engineer
January 2013 - January 2014 (1 year)
• - Developed and maintained core features of B2B and B2C platforms.
• - Led frontend responsive design for Santander Smart City APIs.
• - Managed B2B projects for KPMG and City of Mostoles.
• - Participated in UX – HCI from Stanford University.
• - Stack: Ruby on Rails, MySQL, JavaScript, HTML5, CSS3, Git, RSpec
Hola.com & Hellomagazine.com
Software Engineer (Freelance)
July 2012 - November 2012 (4 months)
• - Built CMS backend to support dynamic PHP views for editorial teams.
• - Improved scalability of backend data delivery systems.
• - Stack: Ruby on Rails, PostgreSQL, JavaScript, jQuery, HTML5, CSS3