About Us

Nu is one of the largest digital financial platforms in the world, with more than 122 million customers across Brazil, Mexico, and Colombia. Guided by our mission to fight complexity and empower people, we are redefining financial services in Latin America and this is still just the beginning of the purple future we're building.

Listed on the New York Stock Exchange (NYSE: NU), we combine proprietary technology, data intelligence, and an efficient operating model to deliver financial products that are simple, accessible, and human.

Our impact has been recognized by global rankings such as Time 100 Companies, Fast Company’s Most Innovative Companies, and Forbes World’s Best Bank. Visit our institutional page https://international.nubank.com.br/careers/  

About the Role

We are looking for an experienced engineer who thrives on solving "meta-problems"—fixing the tools and processes that other teams rely on. You will be responsible for designing and implementing high-leverage automation, managing enterprise tool rollouts (e.g., Postman, n8n), and defining the technical governance for our next-generation AI workflows.

Key Responsibilities

• Enterprise Automation & Platform Engineering:
  • Lead the implementation and maintenance of automation platforms (e.g., n8n) to orchestrate workflows across business units.
  • Design and optimize critical communication infrastructure (e.g., AWS SES, email delivery resilience) to ensure high availability for internal and transactional messaging.
• AI & "Vibe Coding" Governance:
  • Drive the technical strategy for AI adoption within engineering workflows.
  • Develop governance frameworks to ensure safe, compliant, and effective use of AI coding assistants and agents.
  • Build "Minimum Control Platforms" that balance developer freedom with security and operational risk requirements.
• Internal Tooling Standards:
  • Define and enforce usage standards for developer tools (e.g., Postman for API lifecycle), ensuring consistency across squads.
  • Conduct "Discovery Design" for new internal products, ensuring they are inclusive and scalable across different technical frameworks.
• Cross-Functional Technical Leadership:
  • Act as a technical reference for the domain, influencing architectural decisions beyond the immediate team. Mentor senior engineers and partner with stakeholders (ITSec, Privacy) to align technical solutions with company policies.

What are we looking for?

Technical Skills

• Solid Software Engineering Background: Proficiency in modern programming languages (Clojure, Java, or Python preferred) and distributed systems.

• Infrastructure & Cloud: Strong hands-on experience with AWS (specifically services like SES, Lambda, IAM) and Infrastructure-as-Code (Terraform/CloudFormation).

• Automation Mindset: Experience with workflow automation tools (n8n, Zapier, or custom orchestration engines) and API integration.

• AI/LLM Familiarity: Interest or experience in integrating LLMs/AI agents into developer workflows (e.g., Cursor, Copilot, internal AI agents).

• Advanced English

Behavioral & Strategic Skills

• Governance-Aware: You understand that "efficiency" must be balanced with "security." You can design systems that are safe by default without destroying developer velocity.
• Problem Solver: You are comfortable debugging opaque infrastructure issues (like email deliverability drops) one day and writing a strategic policy document the next.
• Multiplier: You enjoy documenting your work, creating "Golden Paths" for other engineers, and teaching others how to use the tools you build.

Location

• Durham, United States
• Miami, United States
• Palo Alto, United States
• Washington DC, United States

Our Benefits

• Opportunity of earning equity at Nu
• Medical Insurance
• Dental and Vision Insurance
• Life Insurance and AD&D
• Extended maternity and paternity leaves 
• Nucleo - Our learning platform of courses
• NuLanguage - Our language learning program
• NuCare - Our mental health and wellness assistance program
• 401K
• Saving Plans - Health Saving Account and Flexible Spending Account
• Work-from-home Allowance
• 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/

Location-Specific Disclosures

• Palo Alto: Total compensation includes base salary, RSUs and benefits. Base salary range: $11,712 - $17,568

About Us

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. Nubank was listed on the NYSE in 2021 and was recently named one of Time Magazine's 100 Most Influential Companies. For more information, visit www.nu.com.br.

About the Role

Crypto is the engine behind our expansion to provide borderless, crypto-based financial services. We are building a world where any user can open an account to send and receive money globally without the friction of traditional banking.

You will join a high-impact team expanding Nubank’s security and scale into the crypto market. Whether focusing on our core brokerage platform or fast-paced product iteration, your work will directly enable millions of users to engage with digital assets safely. This role is for those eager to solve complex architectural tradeoffs and redefine the boundaries of global money.

Responsibilities

• Architect scalable systems for the Crypto department, ensuring robust integration between crypto brokerage and core banking.
• Lead the technical design of global features, managing complex tradeoffs between system performance and security.
• Manage assets under custody and brokerage platforms to ensure high availability for global crypto transactions.
• Partner with product teams to iterate on trading experiences, specifically tailored for high-engagement crypto profiles.
• Mentor and influence engineering teams across the organization to uphold high standards of technical excellence.
• Optimize global money movement solutions to provide free, real-time cross-border transactions for our users.

Required Qualifications

• Track record of leading technical architecture in Staff or Lead Engineer capacities within complex software environments.
• Demonstrated expertise in system design, with a focus on analyzing tradeoffs and long-term scalability.
• Experience in high-stakes industries such as FinTech, Payments, or Core Banking systems.
• Evidence of building and shipping high-throughput, distributed systems in a collaborative environment.
• Strong commitment to learning and implementing crypto-based technologies and blockchain fundamentals.

Nice to Have

• Prior experience in a crypto exchange or crypto-native company
• Practical experience with Solidity or smart contract development.
• Background in crypto trading or deep understanding of digital asset markets.

Location & Work Model This role is based in Toronto, Canada; or Durham, Palo Alto, or Miami, USA, on a hybrid model (2x/week) at our local offices.

Diversity & Inclusion / Equal Opportunity

At Nubank, we believe that diversity is essential to building the best products and services. We are committed to creating a welcoming work environment that respects and values diversity in all its forms, and we encourage people from all backgrounds to apply. We are proud to be an equal opportunity employer and do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

About Us

Nu is one of the largest digital financial platforms in the world, with more than 127 million customers across Brazil, Mexico, and Colombia. Guided by our mission to fight complexity and empower people, we are redefining financial services in Latin America and this is still just the beginning of the purple future we're building.

Listed on the New York Stock Exchange (NYSE: NU), we combine proprietary technology, data intelligence, and an efficient operating model to deliver financial products that are simple, accessible, and human.

Our impact has been recognized by global rankings such as Time 100 Companies, Fast Company’s Most Innovative Companies, and Forbes World’s Best Bank. Visit our institutional page https://international.nubank.com.br/careers/  

About the role

As a Senior Security Analyst, you will be the guardian of our physical integrity and operational continuity in the country. In a hyper-growth environment like Nu, security isn't just about protection—it's about enabling the business to scale safely. You will own the local security landscape, ensuring our facilities are world-class, our executives are protected, and our crisis response is seamless. Your goal is to build a resilient security technology stack and a culture of safety that aligns with our global standards while respecting local nuances.

You'll be responsible for

• Leading the Infrastructure Lifecycle: You will oversee the maintenance, audit, and optimization of CCTV, Access Control, and Alarm systems to ensure 100% operational readiness.
• Driving Expansion: You’ll manage the physical build-out of security measures for new offices and facilities, ensuring we scale without compromising safety.
• Operational Excellence & Compliance: Implementing global security policies and adapting them to local regulations, while managing third-party providers (guards and integrators) to high-performance standards.
• Strategic Support: Acting as a key pillar for Investigations, Executive Protection, and Crisis Management, including logistics for high-level meetings and travel.
• Stakeholder Integration: Serving as the primary bridge between local teams and Headquarters, facilitating information flow and translating global needs into local actions.
• Continuous Improvement: Utilizing data and reports (via Google Workspace/Slack) to monitor performance and identify proactive security optimizations.

We are looking for a person who has

• Solid Security Background: At least 8 years of hands-on experience in Physical Security, with a proven track record of managing complex corporate environments.
• Crisis & Protection Expertise: Practical knowledge in Executive Protection and Crisis Management, knowing how to act under pressure and handle confidential information with total integrity.
• The "Builder" Mindset: Experience not just maintaining, but implementing new security technologies and overseeing physical construction/security installations.
• Multilingual Communication: Fluent proficiency in English and Spanish is required, as you will be the key link between local operations and a global HQ.
• Vendor Management Skills: Experience evaluating and driving performance from third-party security and maintenance partners.
• Tech Savviness: High proficiency in Google Workspace or Microsoft Office Suite and Slack to manage documentation, databases, and reporting.
• Adaptability: The ability to work independently in a fast-paced environment, prioritizing tasks effectively to meet tight deadlines.

Location for this opportunity (City, Country)

• Palo Alto, United States

Our Benefits

• Opportunity of earning equity at Nu
• Medical Insurance
• Dental and Vision Insurance
• Life Insurance and AD&D
• Extended maternity and paternity leaves 
• Nucleo - Our learning platform of courses
• NuLanguage - Our language learning program
• NuCare - Our mental health and wellness assistance program
• 401K
• Saving Plans - Health Saving Account and Flexible Spending Account
• Work-from-home Allowance
• Relocation Assistance Package, if applicable.

Work Model for this Role

• Option 1: 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/ 

Explore how we build technology at Nubank:

🔗 building.nubank.com.br ↗

🎥 youtube.com/@building.nubank ↗

🎧 Listen to our stories on Spotify ↗

About Nu

Nu is one of the largest digital financial platforms in the world, with more than 127 million customers across Brazil, Mexico, and Colombia. Guided by our mission to fight complexity and empower people, we are redefining financial services in Latin America and this is still just the beginning of the purple future we're building.

Listed on the New York Stock Exchange (NYSE: NU), we combine proprietary technology, data intelligence, and an efficient operating model to deliver financial products that are simple, accessible, and human.

Our impact has been recognized by global rankings such as Time 100 Companies, Fast Company’s Most Innovative Companies, and Forbes World’s Best Bank. Visit our institutional page Careers at Nu - Join our team!

About the Role

At Nubank, AI is not a "bolt on" feature. It is existential to our next phase of growth. We are transforming into an AI native company, where intelligent systems don't just support our products; they define them. As a Lead Software Engineer in AI Agents & Orchestration, you will be at the heart of this metamorphosis.

You will lead the technical direction for embedding Generative AI and LLMs into the lives of over 130 million customers. This role isn't about working in an isolated lab; it's about building production grade, agentic workflows and RAG pipelines that scale across multiple markets. You will leverage our specialized GenAI Platform including: inference services, evaluation frameworks, and orchestration layers to move from experimentation to global impact at "Nu-speed."

Why this role is compelling

• Agency & Transformation: You aren't just a cog in a machine; you are an architect of the AI Native Bank.
• Scale that Matters: Your code will power financial empowerment for a population larger than most countries.
• The AI Multiplier: You will work within a formal framework that measures and rewards the productivity gains and innovation you unlock via AI.

Responsibilities

• Lead the AI Architecture: Define the technical roadmap for AI native applications, ensuring our LLM integrations are scalable, cost effective, and highly reliable.
• Build Agentic Workflows: Design and implement complex agentic systems and RAG patterns that provide hyper-personalized financial experiences.
• Drive Engineering Excellence: Set the "canonical" standards for AI development at Nu, promoting reusable components
• Collaborate Across Surfaces: Partner with Product, Design, and Data Science to embed LLM capabilities across mobile, web, and internal operations tools.
• Optimize for Quality: Establish rigorous evaluation (QA) and monitoring practices for AI outputs to ensure safety, accuracy, and human in the loop integrity.
• Mentor and Scale: Actively participate in hiring and mentoring, fostering a high performance culture within our internal AI Academy and technical guilds.
• Strategic Decision Making: Balance short term delivery with medium term platform stability, making critical tradeoffs on model selection and system complexity.

Qualifications

Required

• Technical Leadership: Track record as a lead delivering high impact, large scale software systems.
• AI First Mindset: Professional experience implementing LLMs, Generative AI features, or RAG patterns in a production environment.
• Full Stack Thinking: Proficiency in building maintainable codebases and API designs that bridge model inference layers with userfacing surfaces.
• Complex Problem Solving: Experience navigating ambiguous projects that require coordination across multiple business units and stakeholders.
• Strategic Acumen: Ability to link technical AI initiatives to core business drivers like operational efficiency and customer acquisition.

Nice to Have

• Ecosystem Experience: Familiarity with PyTorch, TensorFlow, or Python based AI toolchains.
• Modern Stack: Experience with Flutter (Mobile) or cloud-native infrastructure (AWS/Azure).
• Domain Expertise: Background in FinTech or highly regulated industries where "Responsible AI" and data privacy are paramount.
• Global Scale: Experience scaling products across diverse international markets and languages.

Our Benefits

• Remote work, with quarterly trips to Sao Paulo to build relationships with coworkers. 
• Top Tier Medical Insurance
• Top Tier Dental and Vision Insurance
• 20 days time off, 14 company holidays, and great culture that emphasizes work life balance. 
• Life Insurance and AD&D
• Extended maternity and paternity leaves 
• Nucleo - Our learning platform of courses
• NuLanguage - Our language learning program
• NuCare - Our mental health and wellness assistance program
• 401K
• Saving Plans - Health Saving Account and Flexible Spending Account

Role Location

Palo Alto, California
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/ 

About Us

Nu is one of the largest digital financial platforms in the world, with more than 127 million customers across Brazil, Mexico, and Colombia. Guided by our mission to fight complexity and empower people, we are redefining financial services in Latin America and this is still just the beginning of the purple future we're building.

Listed on the New York Stock Exchange (NYSE: NU), we combine proprietary technology, data intelligence, and an efficient operating model to deliver financial products that are simple, accessible, and human.

Our impact has been recognized by global rankings such as Time 100 Companies, Fast Company’s Most Innovative Companies, and Forbes World’s Best Bank. Visit our institutional page Careers at Nu - Join our team!

About the Role

As a Principal Product Designer, you are the senior-most design authority on the team. You are a visionary with the ability to execute swiftly, articulating solutions that don't just improve the status quo but redefine it. This is an IC9-level role, meaning you operate with exceptional autonomy to drive strategic change across multiple countries and functions.

You will be the guardian of our "purple" identity, responsible for defining 0-1 experiences and elevating the level of craftsmanship across our entire global product. From leading the next generation of our illustration system to architecting the core interaction patterns of our homepage, your work will set the technical and aesthetic foundations that millions of people interact with daily. You are a consultant to leadership, a mentor to the guild, and a pioneer of design excellence.

Responsibilities

• Define the Vision: Lead the creation of 0-1 product experiences, setting a high bar for concept and quality that inspires the entire design organization.
• Evolve the Visual Identity: Spearhead the global transition to our new illustration system. Define scalable guidelines that move us from current standards to a unified, global language.
• Architect Core Interactions: Define the structural patterns and widgets for the Nu homepage. Deliver production-ready specifications that bridge the gap between high-level design and engineering execution.
• Unify Global Design: Eliminate fragmentation across Brazil, Mexico, and Colombia. You will create a cohesive design language that feels like "one Nu" while intelligently allowing for local market flexibility.
• Drive Strategic Roadmap: Act as an advisor to business leadership, translating organizational strategy into a tangible design roadmap and removing blocks to ensure a world-class user experience.
• Mentor and Influence: Act as an ambassador for design craft. You will coach senior design leaders and foster a culture of open communication, empathy, and continuous improvement.
• Master AI & Innovation: Identify breakthrough opportunities to integrate AI into the design workflow and product experience, ensuring ethical standards and user trust are always prioritized.

Qualifications

Required:

• Deep Design Mastery: Extensive experience leading design at a global scale, with a portfolio that demonstrates world-class visual craft, UI excellence, and systems thinking.
• Proven Strategic Leadership: Ability to drive large-scale organizational transformations and influence enterprise-level strategy through design.
• Architectural Thinking: Deep expertise in design systems, interaction patterns, and creating scalable frameworks for complex digital products.
• Swift Execution: A "visionary who does"—the ability to quickly prototype and articulate high-fidelity solutions that solve complex, ambiguous business problems.
• Exceptional Communication: Mastery in communicating complex design logic to executive stakeholders and mentoring other designers to improve their persuasive storytelling.
• Global Perspective: Experience working across diverse markets and cultures, with the ability to balance global consistency and local relevance.

Nice to Have:

• Experience in pioneering AI-driven design tools or features.

Our Benefits

• A high leverage compensation package benchmarked against global tech leaders, combining a competitive base salary ($312,000) with significant equity (RSUs) to ensure your success is directly tied to the long-term growth of the purple future we are building together.
• Top Tier Medical Insurance
• Top Tier Dental and Vision Insurance
• 401(k) matching
• 20 days time off, 14 company holidays, and great culture that emphasizes work life balance. 
• Life Insurance and AD&D
• Nucleo - Our learning platform of courses
• NuLanguage - Our language learning program
• NuCare - Our mental health and wellness assistance program
• Extended maternity and paternity leaves 
• Saving Plans - Health Saving Account and Flexible Spending Account
• Twice a week in the office (Palo Alto) + quarterly trips to Sao Paulo (Brazil) to build relationships with coworkers. 

About Us

Nu is one of the largest digital financial platforms in the world, with more than 127 million customers across Brazil, Mexico, and Colombia. Guided by our mission to fight complexity and empower people, we are redefining financial services in Latin America and this is still just the beginning of the purple future we're building.

Listed on the New York Stock Exchange (NYSE: NU), we combine proprietary technology, data intelligence, and an efficient operating model to deliver financial products that are simple, accessible, and human.

Our impact has been recognized by global rankings such as Time 100 Companies, Fast Company's Most Innovative Companies, and Forbes World's Best Bank. Visit our institutional page https://international.nubank.com.br/careers/

About the Role

At Nu, the AI Private Banker is our intelligent financial partner that helps millions of customers understand their finances, make confident decisions, and take action seamlessly. As a Staff Software Engineer on this team, you'll define the technical architecture that powers conversational AI, recommendation engines, and personalized financial experiences across mobile and web.

You'll own the full stack from Flutter mobile apps that reach millions of users to distributed backend systems that process real time recommendations and conversational AI interactions. This isn't just about building features; it's about creating the engineering foundation that makes financial empowerment accessible at scale.

Here, every technical decision you make directly impacts how millions of people experience financial guidance. You'll work at the intersection of banking and frontier AI, building systems that are both innovative and reliable. Behind every product interaction, there are curious minds redefining what's possible—and you'll be one of them.

You'll be responsible for

• Lead the technical architecture and design decisions for AI Private Banker's full-stack platform, ensuring scalability and performance across mobile and backend systems.
• Build and maintain Flutter mobile applications that deliver seamless conversational AI experiences to millions of users across iOS, Android, and Web.
• Design and implement distributed backend services that power recommendation engines, conversational AI integration, and real-time personalization.
• Collaborate with product, design, and data teams to translate ambitious product goals into clear, phased technical roadmaps.
• Drive engineering best practices across the team through code reviews, technical mentorship, and architectural guidance.
• Own the technical strategy for deploying and maintaining a unified user experience across multiple platforms and markets.
• Integrate AI/ML model outputs into consumer-facing applications, ensuring real-time performance and reliability.
• Make decisive technical trade-offs that balance innovation, scalability, and operational excellence.

We are looking for a person who has

Required

• Experience as a Staff Engineer or Senior Engineer shipping complex, large scale consumer facing mobile applications.
• Strong track record of designing, building, and operating high-throughput, fault tolerant backend services using microservices architecture and event driven design.
• Proven ability to take complete technical ownership of a major product area, making informed trade offs on architecture and implementation.
• Experience working with data systems, APIs, and pipelines necessary to power AI/ML outputs within user interfaces.
• Track record of leading technical initiatives and mentoring other engineers on architecture, performance, and operational excellence.

Nice to have

•  Experience in the FinTech or highly regulated industry.
• Familiarity with cloud-native development (AWS).
• Proficiency in one or more backend languages suitable for high-scale applications (e.g., Go, Java, Python, Clojure).
• Experience building conversational AI interfaces or recommendation systems.
• Track record of scaling mobile applications across multiple global markets

Benefits:

• Top Tier Medical Insurance
• Top Tier Dental and Vision Insurance
• 20 days time off, 14 company holidays, and great culture that emphasizes work life balance. 
• Life Insurance and AD&D
• Extended maternity and paternity leaves 
• Nucleo - Our learning platform of courses
• NuLanguage - Our language learning program
• NuCare - Our mental health and wellness assistance program
• 401K
• Saving Plans - Health Saving Account and Flexible Spending Account

Compensation:
Total compensation includes base salary, RSUs, and benefits. Base salary: $345k+ annually.

Location for this opportunity

Palo Alto, United States

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/

About Us

Nu is one of the largest digital financial platforms in the world, with more than 127 million customers across Brazil, Mexico, and Colombia. Guided by our mission to fight complexity and empower people, we are redefining financial services in Latin America and this is still just the beginning of the purple future we're building.

Listed on the New York Stock Exchange (NYSE: NU), we combine proprietary technology, data intelligence, and an efficient operating model to deliver financial products that are simple, accessible, and human.

Our impact has been recognized by global rankings such as Time 100 Companies, Fast Company's Most Innovative Companies, and Forbes World's Best Bank. Visit our institutional page [Careers at Nu - Join our team!](https://international.nubank.com.br/careers/)

About the Role

At Nu, data is the foundation that powers our AI and machine learning models, enabling millions of customers to access fair financial products. As a Machine Learning Engineer in AI Core, Data Intelligence, you’ll work across a broad spectrum — from building scalable data infrastructure and feature pipelines that feed our state-of-the-art foundation models to designing, training, and shipping transaction classification models that power critical customer experiences across the company.

You'll work at the intersection of data and applied machine learning, contributing across multiple stages of the ML lifecycle: ingesting and labeling data, training and evaluating models, and helping with deployment and production monitoring through robust quality controls. You’ll partner closely with product, compliance, and ML teams to ensure models are auditable, privacy-aware, and deliver measurable business value.

You'll join a team that manages the data engineering backbone of AI Core, ensuring data is accessible, healthy, and properly tracked across our entire ML ecosystem. Here, you'll combine your expertise in building scalable data systems with your passion for machine learning, creating solutions that enable our models to learn from better, richer data.

You can read more about the work in the AI Core team on our blog: https://building.nubank.com/understanding-our-customers-finances-through-foundation-models/

Key Responsibilities

As a Lead Machine Learning Engineer in AI Core Data Intelligence, you will:

• Design and build scalable data ingestion pipelines that bring new datasets into our AI Core platform, ensuring reliable, efficient data flow from source to model training.
• Implement data quality monitoring and validation systems that catch issues before they impact model performance, maintaining the health of datasets across our ML ecosystem.
• Model new types of data into our foundation models.
• Analyze the impact of new data sources on existing models, conducting experiments to measure performance improvements and guide data acquisition decisions.
• Develop and maintain data preparation workflows that transform raw data into features ready for model training, working with distributed computing frameworks like Ray.
• Tune and optimize machine learning models when new datasets are integrated, applying hyperparameter optimization and evaluating model performance improvements.
• Collaborate with AI Core ML, Platform, and Infra teams to ensure seamless data flow across our ML infrastructure, from ingestion to model deployment.
• Lead technical initiatives that improve our data engineering practices, setting standards for data quality, pipeline reliability, and model-data integration.
• Mentor team members and contribute to hiring activities, helping build a strong and diverse team that drives innovation in AI infrastructure.

Basic Qualifications

• Typically 6+ years of experience in machine learning engineering, data engineering, or related fields with a strong track record of building production data and ML systems.
• Proven experience designing and building data ingestion pipelines at scale, with expertise in distributed computing frameworks (Ray, Spark, or similar).
• Strong background in applied machine learning, including model training, hyperparameter tuning, and performance evaluation.
• Experience analyzing how data changes impact model performance, with the ability to design and run experiments to measure improvements.
• Proficiency in Python for data engineering and ML workflows, with experience working with large-scale data processing systems.
• Solid understanding of data quality principles and experience implementing monitoring, validation, and alerting systems.
• Strong problem-solving skills with the ability to address complex, ambiguous problems requiring coordination across multiple teams.
• Excellent communication skills, capable of explaining technical concepts to both technical and non-technical stakeholders.
• Demonstrated leadership experience, including mentoring team members and contributing to technical decision-making.

Preferred Qualifications

• Experience with MLflow or similar model tracking and versioning systems.
• Knowledge of foundation models, fine-tuning workflows, and transformer architectures.
• Experience with data pipeline orchestration tools (Dagster, Airflow, or similar).
• Background in financial services or fintech, understanding the unique data challenges in this domain.
• Experience working in a fast-paced, high-growth environment with distributed teams.
• Track record of reducing complexity in data systems and improving developer experience for ML teams.
  
  

Our Benefits

• Opportunity of earning equity at Nu
• Medical Insurance
• Dental and Vision Insurance
• Life Insurance and AD&D
• Extended maternity and paternity leaves 
• Nucleo - Our learning platform of courses
• NuLanguage - Our language learning program
• NuCare - Our mental health and wellness assistance program
• Extended maternity and paternity leaves 
• 401K
• Saving Plans - Health Saving Account and Flexible Spending Account
• Work-from-home Allowance
• 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/

Locations: This role is available in any of our North American offices (Palo Alto, USA; Miami, USA; Durham, USA; Toronto, CAN)

About Us

Nu is one of the largest digital financial platforms in the world, with more than 127 million customers across Brazil, Mexico, and Colombia. Guided by our mission to fight complexity and empower people, we are redefining financial services in Latin America and this is still just the beginning of the purple future we're building.

Listed on the New York Stock Exchange (NYSE: NU), we combine proprietary technology, data intelligence, and an efficient operating model to deliver financial products that are simple, accessible, and human.

Our impact has been recognized by global rankings such as Time 100 Companies, Fast Company’s Most Innovative Companies, and Forbes World’s Best Bank. Visit our institutional page https://international.nubank.com.br/careers/  

About the Role

The Systems Performance team is part of the Computing Squad consists of two distinct workstreams —Orchestration and System Performance —each with its own approach and challenges on managing and improving the foundational infrastructure where the majority of the Nubank's workloads runs. 

The Performance team is focused on building deep diagnostic tools and performing high-level analysis to reduce latency,  infrastructure costs and increase services efficiency.

You will be responsible for leading complex performance investigations, identifying systemic bottlenecks, and driving efficiency across one of the largest JVM-based microservice architectures in the world.

Our core principles and behaviors include ownership, simplicity, veracity-first, teamwork, and a focus on quality over quantity. During a normal work day, you will interact with critical infrastructure layers, from the Linux Kernel and JVM internals to cloud-wide orchestration.

You'll be responsible for

• Leading Deep-Dive Investigations: Conduct high-level performance analysis to identify and resolve systemic bottlenecks across our global JVM-based microservices architecture.
• Optimizing Resource Efficiency: Drive initiatives to reduce infrastructure costs and latency by fine-tuning JVM parameters, Garbage Collection (ZGC, G1), and memory management (heap and off-heap).
• Building Diagnostic Tooling: Develop and implement advanced observability tools using eBPF, JFR, and Flamegraphs to provide real-time insights into kernel and runtime behavior.
• Kernel & Runtime Alignment: Bridge the gap between the Linux Kernel and the JVM, optimizing thread scheduling (CFS/EEVDF) and managing resource isolation (cgroups/throttling) within our Kubernetes environment.
• Architecting Scalable Solutions: Design and deliver innovative infrastructure improvements that address long-term performance challenges, ensuring our systems scale ahead of demand.
• Technical Mentorship & Culture: Share expertise on JVM internals and performance best practices with the wider Engineering team, fostering a culture of technical excellence and "quality over quantity."
• Root Cause Excellence: Deep dive into complex concurrency issues, lock contentions, and memory leaks, providing definitive fixes for high-impact technical debt.
• Strategic Collaboration: Work closely with the Computing Squad to align orchestration strategies with system performance goals, ensuring a seamless interface between infrastructure and workloads.

We are looking for a person who has

• Expertise in JVM Internals: Deep, low-level knowledge of the JVM is essential. You must understand how the JVM works "under the hood," including JIT compilation (C1/C2), class loading, and intrinsic methods.
• JVM Tuning & Garbage Collection: Extensive experience with GC algorithms (ZGC, G1, Shenandoah), including the ability to tune them for massive heaps and ultra-low latency requirements.
• OpenJDK Contribution (Major Plus): Previous experience contributing to the OpenJDK project or other low-level runtime environments is a significant advantage.
• Linux Kernel & Scheduling: Deep understanding of the Linux Scheduler (CFS/EEVDF), thread scheduling, and how the kernel manages high-concurrency Java workloads.
• Memory Architecture: Mastery of heap and off-heap memory management, including Direct Buffers, memory-mapped files, and diagnosing complex memory leaks.
• Advanced Diagnostics: Mastery of diagnostic tools such as Flamegraphs, JFR (Java Flight Recorder), eBPF, and performing large-scale heap dump analysis.
• Resource Isolation: Extensive experience with cgroups and the impact of CPU Throttling on JVM quotas within Kubernetes/EKS.
• Concurrency: Proven ability to diagnose and resolve complex concurrency problems, including lock contention and race conditions at the instruction level.
• Cloud Platforms: Knowledge of AWS infrastructure and its performance characteristics.
• Develops and delivers innovative solutions that address team-level or project-level challenges, focusing on medium and long-term impact
• Understand the technical aspects, capabilities, and limitations of our systems, contributing to discussions and improvements. 
• Anticipate technical and product issues, making appropriate design decisions to avoid them
• Is enthusiastic about sharing knowledge and mentoring others.
• Deep dive into a problem to identify root causes when prioritized.

 Benefits

• Opportunity of earning equity at Nu
• Medical Insurance
• Dental and Vision Insurance
• Life Insurance and AD&D
• Extended maternity and paternity leaves 
• Nucleo - Our learning platform of courses
• NuLanguage - Our language learning program
• NuCare - Our mental health and wellness assistance program
• Extended maternity and paternity leaves 
• 401K
• Saving Plans - Health Saving Account and Flexible Spending Account
• Work-from-home Allowance
• Relocation Assistance Package, if applicable.

Location for this opportunity (City, Country)

• Palo Alto, United States
• Miami, United States
• Washington DC, United States
• Durham, United States

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/

Opportunity

We are hiring a Principal Engineer to drive architectural consistency and technical excellence for Nubank’s Global Credit Card division—our largest business unit. You will operate across core platforms and product areas to ensure we are building globally optimal solutions. This is a high-influence leadership role where you will align technical strategy with business General Managers to maximize the impact of our platform investments.

2026's Vision (and how this role contributes)

In 2026, the Credit Card division will focus on maturing our core platform to support massive scale while maintaining rapid product innovation. This role is the "downward force" that identifies efficient architectural patterns and pushes them across the organization. By sitting across multiple business areas, you will prevent technical silos and ensure that every engineering investment reinforces a unified, scalable global architecture.

Mission

Design and operationalize a horizontal technical strategy for the Credit Card division so that:

• Architectural Fragmentation is Minimized: Global patterns are identified and disseminated, preventing teams from solving the same problems in isolation.
• Platform Investments are Maximized: High-leverage solutions are pushed "down the stack" to provide efficiency for all product consumers.
• Business & Tech are Seamlessly Aligned: You act as a direct partner to General Managers, translating complex technical trade-offs into business-centric outcomes.

Core Responsibilities

• Drive Cross-Platform Impact: Identify opportunities for globally optimal outcomes across the division’s core platforms and consumer products.
• Architectural Pattern Leadership: Monitor diverse projects to find commonalities; build and disseminate architectural patterns that elevate the entire organization.
• Strategic Mission Strategizing: Maintain the flexibility to jump into urgent, high-stakes technical investigations or strategic missions as needed.
• Business Stakeholder Partnership: Work independently with General Managers to align technical roadmaps with commercial goals.
• Technical Mentorship & Culture: Act as a peer to engineering leadership, raising the bar and mentoring staff engineers on cross-functional thinking.
• Horizontal Execution: Unlike a "narrow and deep" expert, you will maintain a wide orientation to ensure end-to-end technical health across the division.

Key Business & Engineering Metrics You Will Influence

• Global Efficiency: Reduction in redundant work across sub-divisions.
• Platform Adoption: Speed and depth of downward-pushed architectural solutions across product teams.
• Engineering Stability: Reduction in incidents caused by fragmented or inconsistent architectural patterns.
• Business Alignment: Successful delivery of strategic projects and high-stakes technical investigations.

Challenges and Opportunities (What You’ll Own)

• Bridging the Gap: You will solve the problem of siloed excellence by ensuring that the best solutions from one team become the standard for all.
• Influential Agency: You will have the mandate to push for global efficiency.

What You’ll Find in the Team

• High‑calibre engineers, including staff engineers and experienced engineering managers.
• Complex, high‑impact problems at scale: large merchant integrations, real‑time decisioning, strict SLOs and multi‑partner dependencies.
• Unprecedented Scope: The ability to influence the technical direction of Nubank’s most critical and high-volume division.

What You’ll Navigate

• Complexity of Scale: Balancing the immediate needs of specific product areas with the long-term goal of global platform efficiency.
• Communication Switching: Moving between deep technical RFCs with engineers and high-level strategy sessions with General Managers.
• Geographic Flexibility: Working across teams in the US and Brazil, requiring strong remote collaboration and cultural adaptability.