Staff Engineer – Issuing

About the Position

Staff Engineer – Issuing

São Paulo

Engineering - all teams – Engineer /

Full Time - remote /

Remote

At CloudWalk, we are building the core infrastructure behind our credit card operation - from authorization to clearing - handling real-world financial transactions at scale.

This is not a typical backend role.

You will work on systems where latency matters, correctness is critical, and failures have real impact.

The Role

You will design and build the systems that authorize, process, and reconcile transactions in real time - ensuring performance, correctness, and security at every step.

Our stack is heavily based on Rust, and we operate with full ownership of the issuing flow, including authorization, clearing, and ledgering.

Responsibilities

• Build and operate high-performance services in Rust
• Own critical paths in the issuing flow (authorization, clearing, ledger)
• Design systems for low latency, high reliability, and fault tolerance
• Debug complex production issues involving real money
• Ensure system integrity and correctness across all transaction flows
• Drive architecture decisions across teams

Requirements

• Strong experience with distributed systems
• Solid understanding of concurrency, consistency, and fault tolerance
• Experience with high-reliability systems (fintech, infra, etc) is a plus
• Experience with Rust, or willingness to go deep into it
• Hands-on mindset and strong debugging skills

AI as a Multiplier

We use AI as part of how we build.

• Leverage AI tools to accelerate development and debugging
• Improve engineering workflows using automation and agents
• Increase team throughput without compromising quality

Security by Design

Security is not a separate layer - it is part of how we build systems.

• Design systems that are secure by default
• Handle sensitive financial data with strict guarantees
• Ensure integrity and correctness across all transaction flows
• Build systems where incorrect behavior is not acceptable

Why This Role

• Move real money
• Run under strict latency constraints
• Must be correct all the time
• Operate at real-world scale

This is engineering where things actually matter.

The Future We See:

At CloudWalk, we envision a future where AI empowers every field to reach new heights:

• People teams leveraging AI to transform talent acquisition and employee development.
• Marketing professionals creating data-driven, AI-powered campaign strategies.
• Customer Success teams enhancing client experiences with intelligent solutions.
• Risk analysts combining human expertise with AI to navigate complexities.
• Designers collaborating with AI to push creative boundaries.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

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