Data at Brex

Our Scientists and Engineers work together to make data — and insights derived from data — a core asset across Brex. But it's more than just crunching numbers. The Data team at Brex develops infrastructure, statistical models, and products using data. Our work is ingrained in Brex's decision-making process, the efficiency of our operations, our risk management policies, and the unparalleled experience we provide our customers.

What You’ll Do

As a Data Engineer at Brex, you will be a core contributor in transforming raw data into actionable insights for various departments across the organization. You'll collaborate closely with Data Scientists, Software Engineers, and business units to create efficient data models, pipelines, and analytics frameworks that drive the business forward. You also play a leading role in the design, implementation, and maintenance of Core Data tables, our high-quality, curated data source for a wide range of analytic applications. 

Where you’ll work

This role will be based in our Sao Paulo office. We are a hybrid environment that combines the energy and connections of being in the office with the benefits and flexibility of working from home. We currently require a minimum of three coordinated days in the office per week, Monday, Wednesday and Thursday. As a perk, we also have up to four weeks per year of fully remote work!

Responsibilities:

• Design, build, and maintain data models and pipelines that scale with the growing number of services, products, and changes in the company.
• Collaborate closely with Data Scientists, Data Analysts, and Business teams to understand their data needs, translating them into robust, efficient, scalable data solutions that enable ease of predictive analytics, data analysis, and metrics formulation. 
• Maintain data documentation and definitions, building and ensuring that source-of-truth tables remain high quality for data science and reporting applications. 
• Develop and enable integration with various data sources, allowing for more data-driven initiatives across the company.
• Apply best practices in data management to ensure the reliability and robustness of data utilized across various analytics applications.
• Set and proliferate company-wide standards for data relating to structure, quality, and expectations.
• Act as a liaison between the technical and non-technical teams, bridging gaps and ensuring that data solutions align with business objectives.
• Use agentic AI where it speeds up pipeline and quality work, without skipping validation.

Requirements:

• 3+ years of experience in Data Engineering, Data Analytics, or a related field such as Analytics Engineering.
• Advanced knowledge of databases and SQL with the ability to efficiently stage, process, and transform data.
• Experience integrating and orchestrating data workflows with various modern data tools and systems.
• Experience with data modeling, ETL/ELT processes, and data warehousing solutions.
• Experience working with a data warehouse such as Snowflake.
• Experience with a data workflow orchestrator tool such as Airflow.
• Experience with a programming language such as Python. 
• Experience with agentic AI. 
• Exceptional quantitative and analytical skills.
• Strong communication skills and ability to collaborate with various stakeholders, both technical and non-technical.

Nice to have:

• Familiarity with BI tools such as Looker, Tableau, or similar platforms. 
• Solid dbt in production: models, tests, docs, and collaboration in a shared repo. 
• AI-ready data: Metrics and dimensions are clear and reusable so AI-assisted analysis does not fork definitions. 
• Experience with Salesforce data integration. 

Brex LLC is a wholly owned subsidiary of Capital One, N.A.

Full Stack Software Development– LAC (Brazil) - 12 months contractor 

Overview:
Working with governments, foundations, and public sector partners to turn complex challenges into buildable solutions and real impact through AI product-driven delivery.

About Delivery Associates
Delivery Associates (DA) is a global social impact consultancy specializing in transforming the public sector. With over a decade of experience and a foundation in Deliverology®, DA guides leaders through every phase of implementation—delivery-oriented strategy formulation, execution, and evaluation. DA partners with governments, philanthropies, and international organizations, employing actionable strategies to achieve sustainable, lasting outcomes. In every one of our services, you will find a throughline back to this focus on helping our partners deliver better results through better implementation.

Job Description
Delivery Associates is building a new kind of team—one that helps partners across government and the social sector move from policy ambition to real, AI-enabled products and services that improve outcomes for people.

We are hiring a Full Stack Software Developer to help build and ship these solutions. This is a hands-on, execution-focused role: turning defined problems and product direction into simple, functional, and reliable applications that can be deployed and used in real-world public sector environments.

In this role, you will work across the stack—from building backend services and APIs to implementing user-facing interfaces—to design systems that support real workflows. This includes connecting data, integrating APIs, structuring and transforming data, and incorporating external tools (including AI services) into usable, end-to-end processes.

You will work closely with an AI Solutions Engineer, a Product Manager, and Delivery teams to translate ideas into working products—often in contexts with fragmented data, tight timelines, and evolving requirements. Success in this role requires the ability to build quickly, keep solutions simple, and deliver working features that can be used and iterated on in real environments.

Core Responsibilities.

This is a contractor role embedded within small, high-performing delivery teams, where product ownership and execution are tightly integrated. In this role, you will:

• Build and ship functional features and applications in short, iterative cycles (typically 2–4 weeks)
• Contribute across the stack—developing user-facing interfaces (e.g., React/Next.js), backend services (e.g., Python/Node.js), and working with data layers (e.g., Supabase/PostGIS)
• Integrate APIs and external services (including AI services where relevant) into end-to-end workflows
• Work with messy, real-world government datasets—cleaning, structuring, and making them usable within applications
• Translate product and technical requirements into working code in collaboration with an AI Solutions Engineer and Product Manager
• Follow established architecture patterns and contribute to clean, maintainable, and well-structured codebases
• Support deployment and iteration of applications in cloud environments
• Test, debug, and improve systems to ensure reliability and usability in real-world contexts
• Contribute to reusable components and shared code where appropriate

Mindset.

We work well with people that are:

• Adaptable: Public sector work is dynamic. Our people are, too.
• Analytical: We identify, dissect, and solve complex problems.
• Accountable: We are a remote team. We work collaboratively but self-sufficiently; oversight is often minimal.
• Driven: Our work is important, so it’s important we do it well.
• Curious: We never stop learning from our clients, colleagues, and partners.

Required Skills/Experience.
 

• 5+ years of professional experience building and shipping production-grade applications
• Strong proficiency in modern programming languages (e.g., JavaScript/TypeScript, Python) and ability to work effectively across the stack
• Solid experience designing and implementing full-stack systems, including frontend interfaces, backend services, and data models
• Experience integrating and working with APIs, including designing clean service interactions and handling external dependencies
• Ability to work with real-world data: querying, transforming, and structuring datasets for use in applications
• Experience building and maintaining reliable systems, including debugging, error handling, and performance considerations
• Ability to translate product and technical requirements into well-structured, maintainable implementations
• Comfort working in fast-paced, iterative environments with evolving requirements and tight timelines
• Sound engineering judgment, with a bias toward simple, reliable, and maintainable solutions
• Professional English and Portuguese required
• Must be based in and have work authorization in Brazil

What Will Set You Apart.

• Experience integrating AI/LLM APIs into real applications (e.g., OpenAI, Claude), including basic prompt design and structured outputs
• Exposure to building data-driven workflows using external or unstructured data
• Familiarity with geospatial data, public sector datasets, or data pipelines in messy environments
• Experience working on products for government, social impact, or operational service delivery contexts
• Comfort contributing to systems that connect multiple services (APIs, databases, third-party tools) into end-to-end workflows
  
  

What We Offer.

• Meaningful work that contributes to solving complex social challenges around the world
• Ongoing learning and growth through mentorship and leadership opportunities
• Opportunity to shape a new model of delivery at the intersection of consulting, product, and AI

Our Values.

These values serve as an anchor, enabling us to stay true to who we are and what we stand for.

• Passion: It is all about impact.
• Excellence: Delivering to the highest standards.
• Humility: Pride without ego.

About Delivery Associates:

We help governments, foundations, and social impact organizations all over the world turn big ideas, campaign promises, and ambitious goals into everyday reality for the people they serve. With over ten years of experience and expert staff guiding our work, Delivery Associates has delivered impact in areas ranging from education reform in the US to microfinance in South America to agricultural reform in Africa and the Middle East. We approach every problem with a strong bias towards implementation, an open mind to possibilities, empathy for governments and residents, and a strong values system. We are always asking ourselves, our partners, and our clients: What would it take to make change happen?

To learn more about Delivery Associates please visit deliveryassociates.com/our-work or contact our talent team at talent@deliveryassociates.com for more information on opportunities to join our team.

#LI-MG1 #LI-REMOTE

AI Solution Engineer– LAC (Brazil) - 12 months contractor 

Overview:
Working with governments, foundations, and public sector partners to turn complex challenges into buildable solutions and real impact through AI product-driven delivery.

About Delivery Associates
Delivery Associates (DA) is a global social impact consultancy specializing in transforming the public sector. With over a decade of experience and a foundation in Deliverology®, DA guides leaders through every phase of implementation—delivery-oriented strategy formulation, execution, and evaluation. DA partners with governments, philanthropies, and international organizations, employing actionable strategies to achieve sustainable, lasting outcomes. In every one of our services, you will find a throughline back to this focus on helping our partners deliver better results through better implementation.

Job Description
Delivery Associates is building a new kind of team—one that helps partners across government and the social sector move from policy ambition to real, AI-enabled products and services that improve outcomes for people.

We are hiring an AI Solutions Engineer to serve as the technical backbone of this effort. This is neither a research role nor a narrowly defined engineering position. It is a delivery role at its core: translating complex, ambiguous public sector challenges into working solutions that can be deployed and used in the real world.

In this role, you will work closely with Product, Delivery teams, and government counterparts to rapidly design, prototype, and ship AI-powered tools that are not only technically sound, but also practical, credible, and impactful. You will be expected to move quickly from problem definition to functional systems, operating in short, iterative cycles.

This role is designed for someone who combines strong engineering judgment with a deep understanding of modern AI systems—and who can build quickly without compromising quality. Someone who is motivated by impact, comfortable with ambiguity, and driven to turn ideas into systems that improve how public institutions serve people.

Core Responsibilities.

This is a contractor role embedded within small, high-performing delivery teams, where product ownership and execution are tightly integrated. In this role, you will:

• Build functional AI-powered functional prototypes in 2–4 week cycles
• Design and implement agentic workflows using LLM APIs, structured tool use, multi-step orchestration, and MCP integrations
• Own the stack end to end: React/Next.js frontend, Python/Node.js backend, Supabase/PostGIS data layer, cloud deployment
• Work with messy, real-world government datasets — structure them, clean them, make them queryable
• Build systems that drive frontline action and institutional decisions
• Set architecture standards, review code, and guide a Full-Stack Developer on implementation patterns
• Create reusable component libraries and architecture templates that compound across government engagements

Mindsets.

We work well with people that are:

• Adaptable: Public sector work is dynamic. Our people are, too.
• Analytical: We identify, dissect, and solve complex problems.
• Accountable: We are a remote team. We work collaboratively but self-sufficiently; oversight is often minimal.
• Driven: Our work is important, so it’s important we do it well.
• Curious: We never stop learning from our clients, colleagues, and partners.

Required Skills/Experience.
 

• 8+ years of professional software development experience, with a track record of building and shipping production systems
• Strong experience designing and implementing AI-powered applications using modern LLM stacks, including prompt engineering, structured outputs, tool use, and function calling
• Hands-on experience integrating LLMs into real workflows (not just prototypes), ensuring reliability, controllability, and usability of outputs
• Experience building end-to-end AI systems, including agentic or multi-step workflows, and Retrieval-Augmented Generation (RAG) pipelines with external data sources
• Proficiency working with leading AI tools and ecosystems such as OpenAI API, Claude API, Hugging Face, and orchestration frameworks like LangChain or LlamaIndex
• Ability to design and deploy ML pipelines end-to-end, including data ingestion, preprocessing, model integration, and basic monitoring
• Experience deploying and scaling applications in cloud environments (e.g., AWS, Azure, or Google Cloud)
• Demonstrated ability to move quickly from ambiguous problem to working prototype, making strong scoping and prioritization decisions
• Sound technical judgment under uncertainty, with a bias toward simple, reliable, and maintainable solutions over unnecessary complexity
• Professional English and Portuguese required
• Must be based in and have work authorization in Brazil

What Will Set You Apart.

• Cloud certifications: Azure AI Engineer, AWS ML Specialty, or GCP Professional ML Engineer
• Previous work with government or public sector clients in Latin America
• Data & geospatial systems: experience working with geospatial data and tools (e.g., PostGIS, GeoJSON pipelines, mapping APIs), and the ability to incorporate spatial analysis into practical applications.
• Familiarity with vector databases (e.g., Pinecone, Weaviate, FAISS, or similar) to support Retrieval-Augmented Generation (RAG) workflows is highly valued, including designing pipelines for embedding, storage, and retrieval in real-world use cases.

What We Offer.

• Meaningful work that contributes to solving complex social challenges around the world
• Ongoing learning and growth through mentorship and leadership opportunities
• Opportunity to shape a new model of delivery at the intersection of consulting, product, and AI

Our Values.

These values serve as an anchor, enabling us to stay true to who we are and what we stand for.

• Passion: It is all about impact.
• Excellence: Delivering to the highest standards.
• Humility: Pride without ego.

About Delivery Associates:

We help governments, foundations, and social impact organizations all over the world turn big ideas, campaign promises, and ambitious goals into everyday reality for the people they serve. With over ten years of experience and expert staff guiding our work, Delivery Associates has delivered impact in areas ranging from education reform in the US to microfinance in South America to agricultural reform in Africa and the Middle East. We approach every problem with a strong bias towards implementation, an open mind to possibilities, empathy for governments and residents, and a strong values system. We are always asking ourselves, our partners, and our clients: What would it take to make change happen?

To learn more about Delivery Associates please visit deliveryassociates.com/our-work or contact our talent team at talent@deliveryassociates.com for more information on opportunities to join our team.

#LI-MG1 #LI-REMOTE

AI Product Manager– LAC (Brazil) - 12 months contractor 

Overview:
Working with governments, foundations, and public sector partners to turn complex challenges into buildable solutions and real impact through product-driven delivery.

About Delivery Associates
Delivery Associates (DA) is a global social impact consultancy specializing in transforming the public sector. With over a decade of experience and a foundation in Deliverology®, DA guides leaders through every phase of implementation—delivery-oriented strategy formulation, execution, and evaluation. DA partners with governments, philanthropies, and international organizations, employing actionable strategies to achieve sustainable, lasting outcomes. In every one of our services, you will find a throughline back to this focus on helping our partners deliver better results through better implementation.

Job Description
We work with leaders in the public sector (government, philanthropy, non-profits) to turn ambitious goals into real-world results. Increasingly, this means not only advising on what should be done, but defining, building, and deploying solutions that make change possible.

As an AI Product Manager, you will sit at the intersection of client insight, product thinking, and delivery execution. You will translate complex, often ambiguous government priorities into clear, buildable products, and work alongside software engineers and consulting teams to ensure those solutions are delivered and adopted.

Core Responsibilities.

This is a contractor role embedded within small, high-performing delivery teams, where product ownership and execution are tightly integrated. In this role, you will:

Translate delivery needs into buildable products
 • Turn project priorities into clear, structured Product Request Documents (PRDs)
 • Convert PRDs into precise technical specifications that engineers can execute without ambiguity
 • Ensure what is being built is scoped, prioritized, and feasible within delivery timelines
 • Identify and resolve risks early, including scope gaps, data limitations, and delivery blockers

Work closely with consulting and engineering teams
 • Partner with consulting teams to understand delivery goals and translate them into product requirements
 • Align engineers and consultants around a shared understanding of what is being built and why
 • Act as the bridge between delivery teams and technical execution without duplicating roles
 • Support teams in structuring problems and making product-driven decisions

Own delivery and execution
 • Own the product lifecycle from scoping through deployment within live engagements
 • Coordinate across consulting teams, engineers, and leadership to maintain momentum
 • Manage timelines, priorities, and trade-offs to ensure consistent progress
 • Define clear success criteria and ensure delivery leads to measurable outcomes

Drive clarity and accountability
 • Bring structure to complex, fast-moving projects
 • Communicate decisions, trade-offs, and progress clearly across teams
 • Maintain focus on outcomes over process
 • Operate with autonomy and accountability in high-stakes delivery environments

Mindsets.

We work well with people that are:

• Adaptable: Public sector work is dynamic. Our people are, too.
• Analytical: We identify, dissect, and solve complex problems.
• Accountable: We are a remote team. We work collaboratively but self-sufficiently; oversight is often minimal.
• Driven: Our work is important, so it’s important we do it well.
• Curious: We never stop learning from our clients, colleagues, and partners.

Required Skills/Experience.
 • 5+ years of experience in product management, technology consulting, or digital transformation
• Experience with AI and data-driven solutions, with the ability to assess feasibility and timelines
 • Demonstrated track record of turning ambiguous client needs into scoped, delivered solutions
 • Ability to write structured product requirements and translate them into actionable technical specifications
 • Good facilitation skills, including leading discussions with diverse stakeholders and aligning priorities
 • Ability to work with engineers and data scientists to scope technical work
 • Professional English and Portuguese required
 • Must be based in and have work authorization in Brazil

What Will Set You Apart.
 • Experience navigating governments
 • Hands-on experience using AI tools in professional contexts
 • Background in sectors such as urban development, public health, education, or social policy
 • Experience working closely with engineering teams to deliver digital or data products

What We Offer.
 • Meaningful work that contributes to solving complex social challenges around the world
 • Ongoing learning and growth through mentorship and leadership opportunities
 • Opportunity to shape a new model of delivery at the intersection of consulting, product, and AI

Our Values.

These values serve as an anchor, enabling us to stay true to who we are and what we stand for.

• Passion: It is all about impact.
• Excellence: Delivering to the highest standards.
• Humility: Pride without ego.

About Delivery Associates:

We help governments, foundations, and social impact organizations all over the world turn big ideas, campaign promises, and ambitious goals into everyday reality for the people they serve. With over ten years of experience and expert staff guiding our work, Delivery Associates has delivered impact in areas ranging from education reform in the US to microfinance in South America to agricultural reform in Africa and the Middle East. We approach every problem with a strong bias towards implementation, an open mind to possibilities, empathy for governments and residents, and a strong values system. We are always asking ourselves, our partners, and our clients: What would it take to make change happen?

To learn more about Delivery Associates please visit deliveryassociates.com/our-work or contact our talent team at talent@deliveryassociates.com for more information on opportunities to join our team.

#LI-MG1 #LI-REMOTE

About Us

Nu was born in 2013 with the mission to fight complexity to empower people in their daily lives by reinventing financial services. We are one of the world’s largest digital banking platforms, serving millions of customers across Brazil, Mexico, and Colombia.

About the role

At AI Core, we are scaling the impact of our AI initiatives to become the primary driver of Nubank’s most critical decision systems. We are seeking an Lead Machine Learning Engineer (Applied AI Scientist) to lead high-impact research projects that bridge the gap between state-of-the-art AI and production-grade financial systems. You will be responsible for solving complex, ambiguous problems using Deep Learning and Foundation Models, ensuring our architectures are scalable, efficient, and driving measurable business results.

As an Applied AI Scientist (MLE), you’re expected to:

1. Research Execution & Technical Leadership (Complexity & Autonomy)

• Lead and execute complex applied research initiatives independently, focusing on building and optimizing architectures (e.g., Transformers, GNNs) that can be deployed across critical use cases like Credit, RecSys, GenAI, and real-time inference.
• Address difficult and ambiguous modeling problems that require coordination across various stakeholders (Data, Infra, Product), delivering innovative solutions with a clear focus on medium-term impact.
• Bridge the gap between research and production by designing architectures that respect MLOps constraints, ensuring models are optimized for latency, interpretability, and cost-efficiency.

1. Strategic Impact & Collaboration (Impact)

• Develop and deliver innovative solutions that address project-level challenges, focusing on pushing the latest platform and AI research improvements into downstream production models.
• Actively participate in cross-functional collaborations, ensuring that research outputs are seamlessly integrated into Nubank's decision-making engines.
• Establish technical standards within the AI Core team for experimentation, model evaluation, and code quality, inspiring peers to raise their performance.

1. Mentorship & Function Contribution (Function Contribution)

• Serve as a technical mentor for senior engineers and researchers, providing guidance on deep learning fundamentals, problem formulation, and research methodology.
• Actively contribute to the function's growth by participating in mandatory activities like hiring (interview panels) and leading internal task forces to improve our ML lifecycle.
• Contribute to thought leadership by participating in research collaborations or internal papers that align with Nubank’s strategic goals.

What are we looking for?

• Professional Experience: 5-7+ years in applied AI/ML, with a proven track record of delivering research-driven systems into production environments
• Technical Mastery:
  • Deep expertise in Deep Learning architectures (Transformers, Multimodal, or GNNs).
  • Strong coding skills in Python and proficiency with frameworks like PyTorch, JAX, or TensorFlow.
  • Solid understanding of MLOps and the constraints of deploying models at scale.
• Problem Solving: Sophisticated skills in ML problem formulation and the ability to navigate uncertainty when data is messy or unavailable.
• Communication: Ability to communicate complex technical concepts to both technical peers and cross-functional stakeholders, ensuring alignment and buy-in.
• Analytical Capacity: Experience with large-scale experimentation and A/B testing to validate research hypotheses.

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

Work Model for this Role

Hybrid 2-3 times/week: Our hybrid work model brings us to the office at least twice a week, on strategic days designed to maximize team connection and collaboration. For more details, visit https://building.nubank.com/nu-hybrid-work-model/