Senior Security Engineer

SECURITY ENGINEER

ABOUT NELO

Nelo is a leading consumer fintech and e-commerce platform in Mexico, with >$500MM in annualized GMV and >$75MM in annualized revenue. Our mission is to increase the buying power of consumers in Latin America, and we are doing so by building a modern alternative to credit cards. Nelo has raised over $40M of venture capital from investors including Homebrew, Two Sigma Ventures and Susa Ventures. Nelo has additionally raised a $100M asset credit facility from Victory Park Capital. Our lean team includes experienced leaders from top technology companies including Uber, Amazon, Rappi, and DiDi. We pride ourselves on our velocity, intellectual rigor, and efficiency. Nelo has offices in Mexico City and New York City.

ABOUT THE ROLE

Security has been part of how Nelo builds software from day one. As we scale, we are creating a dedicated Security Engineer role with broad ownership across application security, cloud infrastructure, and internal controls.

This is a hands-on role for someone who wants to define the security function rather than inherit it. You will decide where to invest, implement controls yourself, and balance risk against velocity in a fast-moving lending business. You will work directly with the CTO, the CEO, and engineering leadership.

This role is in-person at our Mexico City office in Condesa.

WHAT YOU'LL DO

Build secure-by-default systems

- Design and implement security guardrails across cloud infrastructure and developer workflows

- Improve IAM, secrets management, endpoint management, and access controls across production systems

- Harden AWS infrastructure using Terraform and policy-as-code

- Increase observability for security-relevant events and anomalies

Treat security as an engineering problem

- Write code, configs, and tooling to enforce controls

- Replace manual reviews with automation wherever it makes sense

- Make the secure path the default path for engineers

Run external security p...