Senior-Staff / Principal Full-Stack Engineer - AI Private Banker

Nubank•San Antonio, TX

7d•Hybrid

About The Position

We are opening this strategic position in the US to find a highly specialized engineer to help us lead the vision and technical execution of our cutting-edge, AI-enabled Private Banking platform (AIPB). This is a high-impact, hands-on leadership role (IC8/IC9) for a generalist engineer who thrives on shipping robust, consumer-facing mobile applications supported by complex, distributed backend systems at massive scale. You will function as the tech-lead, defining the architectural vision and driving engineering excellence for a product designed to financially educate over 100 million costumers. Crucially, this is a full-stack engineering position. Your expertise will be in system architecture, full-stack implementation, and technical leadership.

Requirements

Proven experience as a Tech Lead or Senior Engineer shipping complex, large-scale consumer-facing mobile applications.
Deep knowledge of both modern frontend frameworks/mobile development and complex distributed backend system architecture.
Strong track record of designing, building, and operating high-throughput, fault-tolerant backend services.
Experience working with and integrating systems with AI, not necessarily training models.
Ability to take complete technical ownership of a major product area, making decisive and informed trade-offs on architecture and implementation.

Nice To Haves

Extensive, hands-on experience with Flutter for building high-quality, native iOS and Android applications. (Note: Any generalist mobile and backend engineer who can pick up Flutter quickly is acceptable).
Proficiency in one or more backend languages suitable for high-scale applications (e.g., Go, Java, Python, Clojure) , and familiarity with cloud-native development (AWS).

Responsibilities

Define the architectural vision and take an opinionated stance on the engineering components necessary to scale the product across multiple global markets.
Architect, design, and implement features across the entire stack, ensuring high performance, scalability, and security. Frontend Mobile: Lead development on our core mobile platforms, preferably using Flutter (iOS/Android).
Design and maintain high-throughput, fault-tolerant distributed systems that power recommendations, conversational AI integration, and the suite of banking products.
Collaborate with product and data teams to ensure effective data flow, consumption, and integration required for the AI-driven features (e.g., real-time user state, recommendation output).
Drive engineering best practices, conduct thorough code reviews, and mentor engineers on architecture, performance, and operational excellence.
Work closely with Product Managers and Design to translate ambitious product goals into a clear, phased technical roadmap.