Engineer - Ruby

CloudWalk; São Paulo; Presencial; BRL 80.000 - 120.000; Tempo integral

Resumo da oferta

A leading fintech company in São Paulo is seeking a Ruby Developer to automate and scale its chargeback processes. You will refactor and enhance existing dispute flows, integrate with Visa and Mastercard APIs, and leverage AI technologies to optimize operations. The ideal candidate has over 3 years of Ruby/Rails experience and a passion for building scalable solutions. Join us to contribute to a mission-driven team focused on continuous improvement and innovation.

Qualificações

• At least 3 years of strong Ruby/Rails experience.
• Experience with RESTful APIs and service integrations.
• Passion for refactoring legacy code.

Responsabilidades

• Refactor and scale existing chargeback and dispute handling flows.
• Integrate with external APIs from Visa and Mastercard.
• Work with AI APIs to automate analysis and decision-making.

Conhecimentos

Ruby/Rails experience

RESTful APIs

Refactoring legacy code

Understanding of payment networks (Visa/Mastercard)

Familiarity with AI tools or APIs

Descrição da oferta de emprego

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