Full Stack Engineer

💻 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