Ruby on Rails Developer

Building reliable Rails systems that scale.

I'm Oscar Olivera — backend developer specializing in SaaS platforms, multi-tenant architecture, PostgreSQL, and REST APIs. Based in Ourense, Spain. Available for remote work.

8+ yrsRails

12+ yrsSQL

SaaSMulti-tenant

RemoteInternational

Let's Work Together See Projects

Skills

Backend

Ruby on Rails PostgreSQL MySQL REST APIs Sidekiq Redis Solid Cache Devise Pundit Spree Commerce

Frontend & Tooling

Hotwire StimulusJS HTML / CSS JavaScript RSpec Docker GitHub Actions AWS CI/CD

Architecture

Multi-Tenant SaaS Query Optimization Service Objects Domain Modeling Safe Migrations

Process

Agile / Scrum Code Review Technical Leadership Remote Collaboration

Experience

Now · Remote

Rails Developer — Icalia Labs / Wholesome / Arches

Staff augmentation on a Rails product codebase, collaborating in English with a product-focused team.

2025

Freelance Rails Developer — NUBBE.NET

Designed and built a multi-tenant SaaS for sports academies — subdomain isolation, PostgreSQL schema, RBAC, caching, CI/CD.

2024

Ruby Developer — Preunic

Upgraded a Spree ecommerce platform and built API services for React micro frontends.

2022–2024

Ruby Developer Contractor — Avenue Code

CSP hardening, integration-test debugging, and production code quality improvements via RSpec and GitHub Actions.

2018–2024

Fullstack / Rails Developer — Acid Labs & others

Ecommerce, API, and product systems across multiple companies — backend ownership with frontend integration.

Projects

NUBBE.NET — Multi-Tenant Sports Academy SaaS

Rails SaaS for sports academies — players, matches, teams, seasons, tournaments. Subdomain tenant isolation, complex PostgreSQL modeling, RBAC, service-driven architecture.

Rails PostgreSQL Multi-tenant REST API CI/CD

End-to-end

Spree Ecommerce — Upgrades & Customization

Modernized legacy Spree stacks, improved API compatibility for React frontends, maintained data consistency and backend reliability in production.

Spree Rails REST API React

Production

Rails Security, Testing & Reliability

CSP hardening, RSpec-driven debugging, and CI improvements across mature Rails codebases.

RSpec CSP GitHub Actions

Quality

Open to new work

Remote opportunities, freelance projects, and backend-focused collaborations — Rails, APIs, SaaS architecture.

Get in touch

oscarmolivera@gmail.com GitHub LinkedIn NUBBE.NET