About the position
- We're looking for a Ruby Developer to help us automate and scale our entire chargeback process, across both our acquiring and issuing operations.
- In this role, you will work on building and refactoring robust dispute flows, integrating with major card networks like Visa and Mastercard, and leveraging AI APIs to bring intelligence and automation to the core of our operation.
- You’ll be responsible for connecting internal and external APIs, designing scalable architecture, and making our dispute handling smarter, faster, and more autonomous.
What You'll Be Doing
- Refactor and scale existing chargeback and dispute handling flows written in Ruby
- Integrate with external APIs from Visa, Mastercard, and other partners
- Work with AI APIs (generative and/or machine learning) to automate analysis, decision-making, and documentation
- Build resilient services to support end-to-end chargeback processes for both issuing and acquiring
- Collaborate with product, data and operations teams to deeply understand business rules and pain points
- Write clean, maintainable code and contribute to a culture of continuous improvement
What You Need To Succeed
- Strong Ruby/Rails experience (at least 3 years)
- Experience with RESTful APIs, background jobs, and service integrations
- Passion for refactoring legacy code and designing scalable solutions
- Understanding of payment networks (Visa/Mastercard) and/or chargeback operations is a big plus
- Familiarity with AI tools or APIs (e.g. OpenAI, Langchain, ML models) is a nice-to-have
- Ownership mindset and a willingness to build from scratch
Top Skills
What We Do
We are democratizing the payments industry in Brazil, by empowering entrepreneurs through technological, inclusive, and life-changing solutions. Based in Brazil, CloudWalk is a high-end global payment network built on modern technology and proprietary blockchain, focused in bringing a revolution to the payment ecosystem for small and medium-sized businesses. As a unicorn, the company has provided its customers with more than R$ 1 billion in savings by charging fair fees on its transactions and is now present in more than 300.000 businesses across 5.000 brazilian cities. With investors such as the Valor Capital Group, HIVE Ventures and Coatue, the company has already raised US$ 365.5 million in investments and R$3.4 billion in FDICs for anticipation of receivables in its network of financial solutions. In 2022, it was the only brazilian fintech to be featured in the "The Retail Tech 100" ranking by CB Insights, on the "Protection Solutions for Payments and Frauds".
