Paulo Langer

• Actively designing and developing APIs to serve health data from Ruby on Rails backend to React frontend • Integrated external third-party health data and treatment providers • Refactored Docker environment and initiated upgrade from Ruby 3.1 to 3.4 and Rails 6.1 to 8.0.1 • Managed QA deployments and ensured continuous documentation updates for API

• Enhanced functionality of aviation-related systems used by European civil-military authorities. • Built new features in a regulated environment using secure, scalable architecture. • Delivered improvements using Ruby on Rails, Javascript, Oracle DB, Docker containers, and Azure CI/CD.

• Built and maintained backend features for OMR’s B2C tech festival platform. • Delivered GraphQL endpoints and optimized infrastructure for high concurrency. • Contributed to a scalable system hosted on Google Cloud with Kubernetes.

• Enhanced internal Feature Toggle and A/B Testing platform used by dozens of engineering teams. • Implemented new functionalities with Ruby on Rails 7 and maintained high test coverage with RSpec. • Operated in a production-grade Kubernetes environment using MySQL as data layer • Support Site Reliability and Observability

• Built high-volume API application from scratch to serve over 100K daily requests. • Migrated complex business rules from legacy systems to scalable Rails architecture. • Deployed services in Kubernetes with GraphQL and React integration.

• Contributed to core platform growth for a global e-commerce SaaS used by thousands of merchants. • Developed full-stack features with Ruby (Rails, Padrino, Sinatra) and React. • Collaborated on frontend refactor using Webpack and introduced performance optimizations. • Contributed with lots of fulfillment integrations