Description

Senior backend engineer specializing in Ruby on Rails and AI-powered products.

I help companies ship reliable backend systems — from greenfield builds to modernizing legacy codebases — with 15+ years of production experience across high-traffic consumer products and complex third-party integrations.

What I bring:

Deep Ruby on Rails expertise: 15 years shipping production systems, including 9 years at Mumsnet (UK social platform, millions of active users) and recent work at Lufthansa Innovation Hub.

Production LLM integration: built Swifty, an AI travel assistant at Lufthansa Innovation Hub, orchestrating an LLM across flight booking, hotel (Expedia), and payment (Stripe) APIs with resilient state machines and graceful failure handling.

Third-party API orchestration: payments, travel, data feeds — making unreliable external systems feel reliable to end users.

AI-assisted development workflows (Claude Code, Cursor) that materially accelerate delivery without sacrificing code quality.

How I work best:

Part-time or full-time engagements, remote or hybrid, ideally with teams that value clear communication, pragmatic engineering, and shipping over speculation. Fluent in Portuguese and English.

Through my consultancy, Codekeeper Consulting.

Industry field of expertise

Languages

English
Native or bilingual
Portuguese
Native or bilingual

Workplace preferences

Remote only

Primarily works remotely

Lufthansa Innovation Hub
Senior Software Engineer (Backend
AVIATION AND AEROSPACE
March 2020 - April 2026 (6 years and 1 month)
Berlin, Germany
Senior backend engineer contributing to customer-facing digital products for Lufthansa Group brands, supporting high-traffic, production systems used across multiple airlines. Key Contributions
• • Designed, developed, and maintained Ruby on Rails backend services and APIs supporting multiple airline brands and consumer products
• • Took full ownership of backend features, from technical design and implementation through deployment, monitoring, and long-term maintenance
• • Improved system stability, performance, and maintainability across both greenfield projects and mature, long-running platforms
• • Led and influenced architectural decisions, balancing scalability, performance, and pragmatic delivery
• • Collaborated closely with product managers, designers, and engineers in a fully remote, async-friendly environment
• • Actively participated in production support, debugging incidents and improving operational resilience over time Selected Products
• • Flight Voucher Platforms: Backend services supporting Lufthansa Group brands (Lufthansa, Brussels Airlines, Austrian Airlines)
• • Uptrip (Contributed to backend development and long term platform stability for a consumer travel product
• • Swifty (− Conceived, architected, and implemented the backend for an AI-powered, chat based travel booking application − Designed backend architecture, data models, and third-party travel service integrations − Owned production setup with a strong focus on reliability, maintainability, and real-world usage
Ruby on Rails API REST LLM PostgreSQL Ruby
Mumsnet
Java Developer (Backend)
PRESS AND MEDIA
October 2011 - February 2020 (8 years and 4 months)
London, United Kingdom
• • Developed and maintained backend features in a complex, mission-critical production environment
• • Worked extensively with legacy systems, safely evolving codebases without disrupting live users
• • Strengthened expertise in object-oriented design, system reliability, and operational discipline
• • Collaborated with cross-functional teams to deliver features in a high-availability environment
Java Ruby on Rails MySQL Microservices API
Accenture
Programmer
PUBLIC SECTOR
March 2009 - September 2011 (2 years and 6 months)
Lisbon, Portugal
• • Contributed to enterprise software projects within large, structured delivery teams
• • Built early professional experience in commercial software development and large-scale systems
Java API REST PL/SQL Spring MVC Servlet