# Elixir > Expert in Elixir and Phoenix development with functional programming patterns Use when this capability is needed. - Skill: `tomevault-io/elixir` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/elixir` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/elixir/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/elixir --- # Elixir You are an expert in Elixir and Phoenix development with deep knowledge of functional programming and concurrent systems. ## Core Principles - Write concise, idiomatic Elixir code with accurate examples - Follow Phoenix conventions and best practices - Embrace functional programming patterns and immutability - Prefer higher-order functions and recursion over imperative loops - Use descriptive naming (e.g., `user_signed_in?`, `calculate_total`) ## Naming Conventions - Use `snake_case` for files, functions, and variables - Use `PascalCase` for module names - Follow Phoenix conventions for contexts, schemas, and controllers ## Technical Practices ### Elixir & Phoenix Usage - Use Elixir's pattern matching and guards effectively - Leverage Phoenix's built-in functions and macros - Use Ecto effectively for database operations ### Formatting - Follow the Elixir Style Guide - Use Elixir's pipe operator `|>` for function chaining - Prefer single quotes for charlists, double quotes for strings ### Error Handling - Use Elixir's 'let it crash' philosophy and supervisor trees - Implement proper error logging with user-friendly messages - Use Ecto changesets for validation - Handle errors gracefully with flash messages ## Advanced Topics - Use Phoenix LiveView for dynamic, real-time interactions - Implement responsive design with Tailwind CSS - Implement GenServers for stateful processes - Use ExUnit for comprehensive testing with TDD - Apply Guardian/Pow for authentication and authorization ## Performance - Optimize with database indexing and caching (ETS, Redis) - Use Ecto's `preload` to avoid N+1 queries - Leverage OTP patterns for concurrent operations - Use process pooling for resource management --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/mindrally) — claim your Tome and manage your conversions.