David Ferreira
@davidferreira2
Senior software engineer specializing in Ruby, cloud, and scalable systems.
BrazilWhat I'm looking for
I am a senior software engineer with seven years of experience building and maintaining systems from small apps to large-scale SaaS, primarily using Ruby and Ruby on Rails while also working with Python, Go, serverless tools, and cloud platforms. I consistently write testable, maintainable code using TDD/BDD, take on developer and cloud-ops responsibilities, and have led major refactors and performance optimizations across fintech, edtech, and construction tech.
I drive measurable technical improvements—reducing DB conflict-check requests from 1.6M to 200K, designing event-driven systems with Lambda, Kafka, Go, and Terraform, and migrating search and scheduling to Elasticsearch and serverless components. I mentor peers, lead incident response and postmortems, and leverage AI tools to accelerate development and improve code quality.
Experience
Work history, roles, and key accomplishments
VTRedesigned and hardened scheduling algorithms and migrated scheduling access to event-driven architecture, reducing conflict-check DB requests from 1.6M to 200K and delivering multi-session scheduling and reminders.
Senior Software Engineer
Upright
Aug 2023 - Nov 2023 (3 months)
Developed a distributed loan servicing and slating platform with Ruby on Rails and Sidekiq, stabilizing Sidekiq performance, implementing bug fixes, and proposing monitoring and logging strategies.
EBDeveloped large-scale cloud payment applications (Rails/Sidekiq/Postgres/Elasticsearch), enabled timely access to millions of payments for global merchants, and led scalability and observability improvements.
Developer
Tunts / AOA
Sep 2020 - Oct 2021 (1 year 1 month)
Built a job search and student employment tracking platform (Rails/Angular/NodeJS), led integration between US and Brazil teams, migrated infrastructure to Google Cloud, and added CI with GitHub Actions.
Software Engineer
Prevision
Oct 2019 - Sep 2020 (11 months)
Developed frontend (Vue.js) and backend (Rails) features and calculation-focused endpoints, implemented tests with Jest and RSpec, and performed performance analysis and AWS learning.
Education
Degrees, certifications, and relevant coursework
FPFederal University of Paraná
Master of Engineering, Water Resources and Environmental Engineering
2017 - 2019
Completed a Master's program in Water Resources and Environmental Engineering involving advanced study and research in water resources management.
PUPortland State University
Non-degree study, International Studies
2015 - 2016
Attended as an international non-degree student for exchange studies focused on coursework complementary to engineering studies.
FPFederal University of Paraná
Bachelor of Engineering, Civil Engineering
2011 - 2016
Completed a Bachelor in Civil Engineering with coursework and projects related to engineering fundamentals and infrastructure.
Availability
Location
BrazilAuthorized to work in
Job categories
Skills
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