Erick Contreras
@ercntreras
Software engineer specializing in scalable Ruby on Rails backends, TDD, and payment integrations.
MexicoWhat I'm looking for
I am a results-oriented software engineer with over three years building scalable Ruby on Rails production applications, focused on robust backend systems, payment integrations, and secure authentication flows.
I champion Test-Driven Development and clean architecture, have mentored developers, and conducted 300+ rigorous code reviews in remote-first environments to raise code quality and reduce technical debt.
My hands-on experience includes designing high-throughput REST APIs, SSO with OAuth/OIDC, Stripe integrations, Sidekiq background processing, and CI/CD with Docker and GitHub Actions to deliver reliable, maintainable systems.
Experience
Work history, roles, and key accomplishments
Software Engineer
Civica Digital
Oct 2023 - Mar 2024 (5 months)
Engineered high-throughput REST APIs that reduced manual PDF processing time by 40% and implemented Google OAuth/OIDC SSO, improving security and reducing login support tickets.
Ruby Developer
Apex Systems
May 2022 - Jun 2023 (1 year 1 month)
Led backend Stripe Level 2/3 integrations and built a custom Stripe Link checkout flow, improving transaction granularity and checkout conversion while refactoring legacy controllers into Service Objects.
Performed 300+ detailed code reviews and mentored 30+ international developers in TDD, algorithms, and debugging, facilitating their transition to job-ready engineers in a remote environment.
Education
Degrees, certifications, and relevant coursework
Microverse
Full-Stack Development Program, Full-Stack Development
2021 - 2022
Activities and societies: Pair programming, TDD, Rails and React projects
Completed an intensive Full-Stack Development program with 1,300+ hours of pair programming focused on Ruby on Rails, React, and data structures.
Universidad Autónoma del Estado de Morelos
Bachelor of Engineering, Electrical and Electronic Engineering
2017 - 2020
Studied Electrical and Electronic Engineering with coursework in electronics and related engineering fundamentals.
Tech stack
Software and tools used professionally
Availability
Location
MexicoAuthorized to work in
Website
axisofchange.xyzPortfolio
github.com/er-contrerasJob categories
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