Senior Security Engineer (AI Security)

About Nu

Nu is the leading digital bank in Latin America, serving 135 million customers across Brazil, Mexico, and Colombia. The company has been leading an industry transformation by leveraging data and proprietary technology to develop innovative products and services.

Guided by its mission to fight complexity and empower people, Nu caters to customers’ complete financial journey, promoting financial access and advancement with responsible lending and transparency. The company is powered by an efficient and scalable business model that combines low cost to serve with growing returns.

Nu’s impact has been recognized in multiple awards, including Time 100 Most Influential Companies, Fast Company’s Most Innovative Companies, and Forbes World’s Best Banks.

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About the role

The role is for a Senior Security Engineer to work closely with the team to enhance the security and robustness of our AI ecosystem. Your role will involve conducting adversarial testing, assessing vulnerabilities in machine learning models and Generative AI applications, and contributing to the development and implementation of security frameworks, assess and develop possible controls in our AI ecosystem. This position requires a mix of technical expertise, analytical skills, and a proactive mindset to ensure the continued safety of our AI technologies.

Main Responsibilities

• Identify and analyze vulnerabilities, providing insights and recommendations for mitigation;

• Contribute to the development and implementation of cutting-edge security frameworks, ensuring the responsible and secure usage within our AI ecosystem;

• Work closely with development teams to integrate security measures into the AI development lifecycle;

• Assist in incident response planning specific to AI-related security incidents and participate in simulations to test response effectiveness;

• Develop and integrate tools to automate security assessments and controls;

• Proactively seek knowledge and engage in research and development initiatives to support innovation;

• Raise Nubank awareness towards safe AI usage.

Must Have

• Knowledge of security frameworks, such as OWASP;

• Programming skills in languages commonly used in machine learning (e.g., Python);

• Proactive mindset with the ability to analyze complex systems and identify potential security risks;

• Strong communication skills to effectively convey complex security concepts to technical and non-technical stakeholders.

• Hands-on experience with CI/CD pipelines and implementing security tools (e.g., SAST, DAST, SCA).

• Experience with high scalability environments.

• Experience in zero-trust and regulated environments.

Nice to Have

• Experience with AI frameworks and libraries (e.g. PyTorch, TensorFlow);

• Expertise with automation programming languages (e.g. Bash, Ansible, Go);

• Knowledge of cloud infrastructure technologies (e.g. AWS, K8S, Terraform);

• Knowledge of Machine Learning and Generative AI concepts and technologies (e.g. HuggingFaces, MCP).

Role Location

Hybrid: Belo Horizonte, Rio de Janeiro, São Paulo, Campinas - SP.

Our Benefits

• Chance of earning equity at Nubank

• Food/ Meal Card (Vale-Refeição and/or Vale Alimentação)

• Public Transportation Commuting Benefit (Vale-Transporte)

• NuCare – Psychological, Financial and Legal Assistance Program

• Life Insurance

• Medical Plan

• Dental Plan

• NuLanguage – Language Course Program

• Nucleo - Our learning platform of courses

• Extended Parental Leave

• Daycare Allowance

• Parental Consultancy

• Work-from-home Allowance

• Gym Partnerships

• 30 days of paid vacation

• Relocation Assistance Package, if applicable

Diversity & Inclusion

At Nubank, we want to be sure that we're building a more diverse and inclusive workplace that reflects the customers we serve and seek to empower. That's why we hire based on equality. We consider gender, ethnicity, race, religion, sexual orientation, and other identity markers as enriching elements to our company while ensuring neither of them represent a barrier when recruiting fantastic talent.

Our recruitment process may involve the use of artificial intelligence–enabled tools, such as automated interview transcription and analysis, to support the evaluation process. Artificial intelligence is not used to make final hiring decisions; all decisions are made by human reviewers.