Ismael Marin

I build backend systems and help teams ship.

Software engineer and tech lead in León, Mexico. Ruby on Rails is my deepest production stack; I also build developer and AI tools with Rust, Elixir/Phoenix, and Python. Open to full-time, part-time, and contract work.

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What I do

Backend delivery, open-source tools, and clear communication.

architecture
LEADERSHIP

Technical leadership

At Dealerware (May 2022–April 2026), I led technical work for an integrations team and worked on systems processing approximately 10,000 telematics events per minute. I authored 40+ ADRs/RFCs and contributed 370+ merged pull requests across 20+ production repositories.

System Design Mentorship Scalability
smart_toy
OPEN SOURCE

Open-source tooling

I build tools for working with AI in real codebases. rails-ai-bridge provides Rails context and read-only introspection; ruby-skill-bench measures whether added context improves an agent's work.

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POLYGLOT

Backend engineering

I build and modernize Rails products, APIs, and integrations. My recent tools also use Rust, Elixir/Phoenix, and Python. I stay close to the code while helping teams make architectural decisions.

Ruby on Rails
Elixir
Rust
podcasts
COMMUNITY

Writing and teaching

I explain software and AI through articles and De Mentes Aumentadas, a Spanish-language radio segment and podcast.

$ ./broadcast_status
Status: On air | Language: Spanish

Selected Projects

A selection of open-source tools and libraries I build or contribute to.

folder_open rails-ai-bridge

Rails AI Bridge

Generates project context for AI coding assistants and offers read-only Rails introspection through MCP.

memory Rails context, MCP, introspection
trending_up More than 10,000 RubyGems downloads (2026-09-25 UTC)
code View Source
folder_open ruby-skill-bench

Ruby Skill Bench

Compares agent runs with and without extra context in isolated Git workspaces, then uses blind judging to assess the difference.

memory Agent evaluation, Git workspaces
trending_up More than 3,000 RubyGems downloads (2026-09-25 UTC)
code View Source
folder_open brigid

Brigid

A memory-safe Rust CLI that ingests any codebase and generates beginner-friendly, LLM-driven tutorials.

memory Rust CLI, Tutorial Engine
code View Source
folder_open elixir-phoenix-skills

Elixir Phoenix Skills

Agent skills for idiomatic Elixir and work with Phoenix, LiveView, and Ecto.

memory Phoenix, LiveView, Ecto
code View Source
folder_open rs-guard

rs-guard

I contribute to this Rust CLI for multi-provider AI code review in GitHub pull requests and local workflows.

memory Rust, AI code review, GitHub Actions
code View Project
folder_open rust-core-skills

Rust Core Skills

Rust agent skills covering ownership, type-driven design, error handling, project context, and Cargo testing.

memory Rust, ownership, types, testing
code View Source
folder_open pi-vida

pi-vida

A launcher for language-specific coding-agent setups, combining skills, a safety gate, and ticket tracking across Pi and other supported hosts.

memory Rust, coding agents, safety gates
code View Source

Tools I use

Ruby on Rails is my deepest production stack. I also work with Rust, Elixir/Phoenix, and Python.

code_blocks

Languages

  • Ruby BACKEND
  • Elixir CURRENT WORK
  • Rust CURRENT WORK
  • Python CURRENT WORK
widgets

Frameworks

  • Rails PRODUCTION
  • Phoenix CURRENT WORK
  • Hanami RUBY
  • Sidekiq JOBS
database

Systems

  • PostgreSQL CORE
  • Redis DATA
  • Docker TOOLS
  • OpenSearch SEARCH
  • AWS CLOUD
psychology

AI Engineering

  • MCP TOOLS
  • Evals MEASUREMENT
  • LLM integration PRODUCTS
  • Agent skills DEVELOPER TOOLS

Writing & media

Notes from building software, and conversations about AI in Spanish.

radio

De Mentes Aumentadas

language_spanish

I co-host a Spanish-language radio segment and podcast about AI, technology, and how they affect everyday life.

play_circle Follow on Spotify
campaign

Featured Episode

language_spanish

A conversation about why online ads can feel like a phone is listening, and the tracking systems behind that feeling.

play_circle Listen to Episode
article

Writing

Recent writing: “Your JSON Column Is Not a Settings System,” on making application settings easier to reason about.

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