💻 Senior Fullstack Engineer – Ruby on Rails (Freelance, Remote)
Contract Type: Freelance
Commitment: Full-time
Location: 100% Remote
About the Role
Currently looking for a Senior Fullstack Engineer with strong experience in Ruby on Rails and modern JavaScript frameworks. If you’re passionate about building scalable, well-structured web applications and enjoy working in collaborative, high-impact teams, this is a great opportunity.
This is a freelance, full-time role with the flexibility to work from anywhere.
What You’ll Be Doing
* Build, maintain, and evolve scalable web applications using Ruby on Rails.
* Develop modern, responsive front-end interfaces with React (or similar), optimizing for performance and usability.
* Participate in code reviews and maintain high standards for testing and code quality.
* Mentor junior engineers and contribute to team-wide knowledge sharing.
* Work closely with design, product, and engineering leads to understand business needs and deliver long-term, scalable solutions.
* Contribute to fostering a collaborative and supportive engineering culture.
Who You Are
* 6+ years of experience in fullstack development.
* Strong back-end development skills in Ruby on Rails.
* Proficient in modern JavaScript frameworks such as React, Vue, or Angular.
* Solid understanding of HTML5, CSS3, and JavaScript fundamentals.
* Comfortable with Git workflows and collaborative development.
* Experienced in writing tests (RSpec, Capybara) and following TDD/BDD practices.
* Knowledge of AWS services like S3, EC2, CloudFront, etc.
* Experience building and consuming RESTful APIs in SaaS environments.
* Familiar with OOP, SOLID principles, and common design patterns.
* Strong grasp of both relational (PostgreSQL) and NoSQL databases.
Bonus Points For
* Experience with Sidekiq for background processing.
* Familiarity with CI/CD tools (e.g., Capistrano, GitHub Actions).
* Experience working with Agile methodologies.
* Strong interest in psychology, health, or human behavior.
* Native-level Spanish and fluent English.
* Exposure to monitoring/logging tools (Datadog, Sentry, New Relic).
* Strong communication skills and ability to work independently and proactively.
* Experience engaging directly with stakeholders or clients.
What’s Offered
* Freelance contract (long-term potential)
* Full-time hours with schedule flexibility
* Fully remote – work from wherever you do your best work
* Competitive freelance compensation
* A supportive, mission-driven environment