Ruby on Rails Developer

Casado; Brazil; Remote; BRL 180,000 - 240,000; Full time

Job summary

Casado is seeking a Senior Full Stack Engineer in Brazil (Remote) to help scale a US-based fintech platform. You will design scalable backend APIs with Ruby on Rails and build rich frontend experiences using React.js, collaborating with cross-functional teams to deliver value to users.

Join a fast-growing fintech SaaS environment where you’ll own critical features, write high-quality code, and contribute to product direction while working remotely from Brazil.

Qualifications

• 3+ years of software engineering experience.
• Strong commercial experience with Ruby on Rails and React.js.
• Comfortable working across the full stack in a product-focused environment.
• Ability to work cross-functional and contribute to technical discussions.
• Passion for building high-quality software and delivering value to users.
• Strong communication skills and a collaborative mindset.

Responsibilities

• Lead technical delivery across major product initiatives.
• Design and build scalable backend APIs using Ruby on Rails.
• Develop modern frontend applications with React.js.
• Collaborate closely with Product and Engineering teams to solve real user problems.
• Write clean, maintainable, and well-tested code across the full stack.
• Contribute to ongoing product and platform improvements.

Skills

Full stack

Cross-functional collaboration

Problem solving

Attention to detail

Tools

Ruby on Rails

React.js

RSpec

AWS

S3

RDS

ECS

Argo CI/CD

Job description

Senior Full Stack Engineer | Ruby on Rails

Location: Brazil (Remote)

Supporting: US-Based Fintech Company

Package: Competitive Salary + Growth Opportunity

About the CompanyA rapidly growing US fintech SaaS company is looking for a Senior Full Stack Engineer based in Brazil to help scale a market-leading platform used within the alternative investments sector.The business has experienced significant year-on-year growth and continues to expand its engineering team following multiple industry awards and increasing demand for its platform.Their technology streamlines and digitises complex onboarding, transaction, and reporting workflows for investment firms and service providers. The platform connects stakeholders through a modern, collaborative ecosystem designed to reduce operational friction and improve efficiency.

What You’ll Be Doing

• Leading technical delivery across major product initiatives
• Designing and building scalable backend APIs using Ruby on Rails
• Developing modern frontend applications with React.js
• Collaborating closely with Product and Engineering teams to solve real user problems
• Writing clean, maintainable, and well-tested code across the full stack
• Contributing to ongoing product and platform improvements

What They’re Looking For

• 3+ years of software engineering experience
• Strong commercial experience with Ruby on Rails and React.js
• Comfortable working across the full stack in a product-focused environment
• Ability to work cross-functionally and contribute to technical discussions
• Passion for building high-quality software and delivering value to users
• Strong communication skills and a collaborative mindset

Tech Stack

• Ruby on Rails
• React.js
• RSpec
• AWS (S3, RDS, ECS)
• Argo CI/CD

Why Join?

This is an opportunity to join a high-growth engineering team where you’ll have genuine ownership, influence over product direction, and the chance to make a meaningful impact in a fast-moving environment.