Engineer - BackEnd

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

Resumo da oferta

A leading fintech company in São Paulo is seeking an experienced Back-End Developer to automate and scale the chargeback process. This role involves building robust dispute flows and integrating with major payment networks such as Visa and Mastercard. The ideal candidate will have a strong background in back-end development, particularly with Ruby and RESTful APIs, and a passion for optimizing legacy systems. Knowledge of AI tools and a proactive mindset are also valued.

Qualificações

• 3+ years of strong back-end development experience.
• Experience with RESTful APIs and service integrations.
• Passion for refactoring legacy code and creating scalable solutions.

Responsabilidades

• Automate and scale the chargeback process.
• Design and refactor robust dispute flows.
• Connect internal and external APIs.

Conhecimentos

Back-end development

RESTful APIs

Refactoring legacy code

Understanding of payment networks

AI tools or APIs

Ownership mindset

Ferramentas

Ruby on Rails

Descrição da oferta de emprego

About the position

We are looking for a Back-End Developer to help us automate and scale our entire chargeback process, across both 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

• Strong back-end development experience (3+ years), regardless of primary programming language.
• 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 strong plus.
• Familiarity with AI tools or APIs (e.g., OpenAI, LangChain, ML models) is a nice-to-have.
• Ownership mindset and willingness to build from scratch.
• Willingness to occasionally work with Ruby, as part of the existing system is built on it.

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