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Morgana B.
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Morgana B.

Senior Ruby on Rails Developer | AI-Assisted Engineering & Performance

Senior Ruby on Rails developer with 6+ years shipping and scaling production Rails applications, who also builds the AI-assisted development tooling that makes teams faster. I work at two levels: Rails engineering you can rely on. Full-stack work across backend, APIs, and frontend on Rails monoliths. I lead framework upgrades (Rails 7.0 → 8.1, Ruby 3.4), diagnose and fix performance bottlenecks (N+1 queries, missing eager loading, caching gaps), and maintain solid RSpec test suites in Dockerized CI environments. I design RESTful APIs (Active Model Serializer, API versioning), work with PostgreSQL and Active Record at an advanced level, integrate search (Elasticsearch, Solr) and third-party services (Stripe, Iugu, Mailchimp, HubSpot), and deploy on AWS and Heroku with New Relic observability. AI-assisted engineering that scales across a team. I was one of the leads implementing my team's AI harness engineering — surveying adoption, then designing and shipping the shared patterns and tooling that scale across developers. That means not just installing a tool, but building the harness around it: shared CLAUDE.md patterns, hooks, MCP server integrations (read-only Postgres for in-conversation database investigations, New Relic for performance analysis), skills, and slash commands. I've also automated real parts of the development cycle, including code-review and PR-opening workflows. I maintain nitrorails, an open-source multi-platform AI coding-agent plugin (Claude Code, Cursor, Codex, Copilot CLI, Gemini CLI) for Rails performance optimization. I'm also a published Rails technical writer. How I can help you: - Build or extend a Rails application (backend, API, or full-stack) - Rescue and modernize a legacy Rails codebase (version upgrades, performance, test coverage) - Diagnose and fix performance problems on high-traffic apps - Set up AI-assisted development workflows for your team (Claude Code, MCP servers, custom skills, PR automation)

🇧🇷São Francisco do Sul, Brazil$25/hr100% JSS5.00 (2)Since Sep 2017

Earnings and projects

MRR
$618

Last 6 months ÷ 6

World#69,082 / 412k
🇧🇷Country#845 / 4,647
Revenue, last 30 days
$1.1k

Last 6 months: $3.7k

World#38,680 / 412k
🇧🇷Country#526 / 4,647
Total earnings
$15k

Billed in all: $16k

World#161,319 / 412k
🇧🇷Country#1,704 / 4,647
Per project
$3.1k

$3.7k in the last 6 months

World#54,512 / 412k
🇧🇷Country#663 / 4,647
Projects, last 6 months
1
0% fixed100% hourly
World#128,092 / 412k
🇧🇷Country#1,427 / 4,647
Projects in all
5

Across 11 contracts

36% fixed64% hourly
World#266,042 / 412k
🇧🇷Country#2,519 / 4,647

Earnings, last 30 days

$16.2k+$1.1k earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$15k$16k$17kOct 8Oct 23Nov 7

Skill rankings: Top 9% in Heroku

Ranked by MRR among everyone on Upwork with the skill.

  1. #31RSpec180 freelancers · 🇧🇷 #1Top 17%
  2. #36Heroku390 freelancers · 🇧🇷 #2Top 9%
  3. #249Ruby on Rails1,811 freelancers · 🇧🇷 #5Top 14%
  4. #308API Testing1,365 freelancers · 🇧🇷 #2Top 23%
  5. #379GitHub2,823 freelancers · 🇧🇷 #10Top 13%
  6. #772Bootstrap6,899 freelancers · 🇧🇷 #6Top 11%
  7. #1,272API Development6,848 freelancers · 🇧🇷 #14Top 19%
  8. #2,608PostgreSQL12,850 freelancers · 🇧🇷 #24Top 20%