About Nubank

Nubank was founded in 2013 to free people from a bureaucratic, slow and inefficient financial system. Since then, through innovative technology and outstanding customer service, the company has been redefining people's relationships with money across Latin America. With operations in Brazil, Mexico, and Colombia, Nubank is today one of the largest digital banking platforms and technology-leading companies in the world.


Today, Nubank is a global company, with offices in São Paulo (Brazil), Mexico City (Mexico), Buenos Aires (Argentina), Bogotá (Colombia), Durham (United States), and Berlin (Germany). It was founded in 2013 in Sao Paulo, by Colombian David Vélez, and cofounded by Brazilian Cristina Junqueira and American Edward Wible. For more information, visit www.nubank.com.br.



About the team

The AI Security team is part of the Information Security area. The team focuses on securing our AI ecosystem, identifying and addressing vulnerabilities, ensuring data protection and ethical standards in its implementation and usage. For that, we perform many tasks such as performing offensive assessments on implementations focusing on AI usage, creating frameworks to keep it secure and configuring tools and automations to safeguard the information and decisions.



About the role

The role is for a Security Engineer to work closely with the team's Tech Lead 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. 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

  • Collaborate with the team in conducting adversarial testing and security assessments on machine learning models, including Generative AI applications;
  • Identify and analyze vulnerabilities within AI systems, providing insights and recommendations for mitigation;
  • Contribute to the development and implementation of security frameworks, ensuring the responsible and secure use of both traditional machine learning and Generative AI technologies;
  • Work closely with development teams to integrate security measures into the AI development lifecycle, addressing specific challenges posed by Generative AI;
  • Assist in incident response planning specific to AI-related security incidents, including those involving Generative AI, and participate in simulations to test response effectiveness;
  • Help with vulnerability management;
  • Develop and integrate tools to automate security assessments and checks.

Basic Qualifications

  • Proven experience in offensive security, with a focus on adversarial testing, vulnerability assessments, and security framework development;
  • Programming skills in languages commonly used in machine learning (e.g., Python, R) and experience with AI frameworks and libraries;
  • Proactive mindset with the ability to analyze complex systems and identify potential security risks;
  • Experience with security frameworks, such as MITRE and OWASP;
  • Strong communication skills to effectively convey complex security concepts to technical and non-technical stakeholders;
  • Knowledge of Machine Learning and Generative AI concepts and technologies is a plus.


Role Location

Remote (within Brazil). 


  • Health, dental and life insurance
  • Meal allowance
  • Transportation assistance
  • 30 days of paid vacation
  • Equity at Nubank
  • Parking partnership - discounted parking in our office
  • Free bike parking with showers available
  • NuCare - Our mental health and wellness assistance program
  • NuLanguage - Our language learning program
  • Gympass partnership
  • Extended maternity and paternity Leaves  
  • Child care allowance
  • ‘Espaço Feijão’- Private nursing and breastfeeding spaces in our buildings
  • Onsite Health Center - Medical support for every Nubanker in our office

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.

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Pesquisa Demográfica

Para ter certeza que estamos construindo um ambiente mais diverso e inclusivo, nós buscamos recrutar nos movendo para um espaço de representatividade e proporcionalidade. Isso significa que consideramos expressões de gênero, etnia, raça, religião, orientação sexual e outros marcadores de identidade como fatores que enriquecem nossa empresa, garantindo que nenhum deles sejam barreiras para que possamos recrutar talentos.

Para isso, pedimos que você compartilhe algumas informações adicionais para que possamos alavancar nossos objetivos e esforços de recrutamento, lembramos que essa pesquisa é totalmente opcional e voluntária. Para mais informações sobre a coleta e manutenção desses dados, acesse nossa Política de Privacidade para Pessoas Candidatas em Português, Espanhol (México) ou Inglês.

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