Full-Stack Engineer

Hi there We are South and our client is looking for a
Full Stack Engineer
Note To Applicants

• Eligibility: This position is open to candidates residing in Latin America.
• Application Language: Please submit your CV in English. Applications submitted in other languages will not be considered.
• Professional Presentation: We encourage you to showcase your professional experience by including a Loom video in the application form. While this is optional, candidates who provide a video presentation will be given priority.
• Note: If you're hired for this role, you may be asked to update your LinkedIn profile :)

Job Summary
Our US-based client is looking for a Full Stack Engineer to join our team as we build and validate our next-generation fintech platform. This is an opportunity to help craft user-facing experiences that bring clarity, control, and collaboration to modern personal finance.We're looking for someone with deep technical experience who's excited to:

• Build and evolve our software platform using Ruby on Rails and React, contributing to both the frontend and backend architecture.
• Write clean, maintainable, and well-tested code with performance and scalability in mind.
• Collaborate closely with the founding team to iterate quickly on product direction, technical tradeoffs, and customer feedback.
• Bring a product mindset—considering usability, edge cases, and long-term maintainability in every implementation.
• Help shape our engineering practices and technical roadmap with a bias toward security, transparency, and control—the same values we bring to our customers.
• Offer mentorship and thoughtful feedback to other team members, fostering a culture of learning and inclusion.

We're early, and that's part of the opportunity. As one of the first engineers on the team, you'll have the chance to influence not just the codebase, but the company's direction, values, and culture.

Who you are

Are you passionate about building interfaces that help people make smarter decisions with less stress? Do you believe design systems can elevate team velocity and product quality? Are you excited by the challenge of simplifying complex financial workflows for everyday users?

We're looking for someone who thrives in early-stage environments. You're comfortable balancing fast execution with thoughtful design. You have strong opinions, held loosely, and you understand how to make software feel human.You're a problem solver. A builder. A creative technologist who brings both empathy and technical excellence to the table.

• +3 years of experience as a Full Stack engineer
• Advanced english level
• Highly proficient in Ruby on Rails (8+)
• Experience working with RSpec and React (19+)
• Previous experience working at a US-based fintech company is highly preferred

Tech Stack Also Includes

• PostgreSQL
• Redis
• Google Cloud
• TypeScript
• Storybook
• Tailwind CSS
• Responsive design principles
• Vercel / V0
• GitHub
• GitHub Actions

Who we are

Our US-based client is a fintech SaaS company redefining collaborative personal finance. Our mission is to help people enjoy today while confidently preparing for tomorrow. The founding team recently exited our previous company and we're applying that momentum to build something meaningful again. We're humble, hardworking, and believe in transparency, trust, and putting people first—our team and our users.

Schedule & Working hours:
This is an 8-hour shift full-time job. We ask for at least a 9 AM–4 PM CT overlap (You can work 7 am to 4 pm CST or 9 am to 6 pm CST).

Perks

• 10 days of PTO after the 3 months in the company, flexible
• US holidays + most important local holidays

If you're a thoughtful full stack Ruby on Rails and React engineer excited by the opportunity to build with purpose and make a real impact—we'd love to hear from you - s
end us your resume