Senior Staff / Principal Engineer - Digital Ecosystem

<h2><strong>Opportunity</strong></h2> <p>We are hiring a Senior Staff or Principal Engineer to support driving the technical vision and execution for Nubank’s Digital Ecosystem division, with initial focus on NuPay, Ads &amp; Rewards and Insurance. This is a division‑level leadership role: you will work with exceptional engineers (including staff engineers), lead cross‑org architectural decisions, negotiate trade‑offs with product/finance/legal, and enable scalable delivery of high‑impact products (checkout &amp; wallet, advertiser platform and benefits hub, and 1‑click insurance products).</p> <h2><strong>2026's vision and (how this role contributes)&nbsp;</strong></h2> <p>In 2026 we will transform the Digital Ecosystem into a place where customers discover advantages, pay effortlessly and feel protected, and where merchants grow through data‑driven integrated partnerships. Our priorities are: (1) <strong>elevating app quality,</strong> (2) <strong>deepening customer engagement with contextual and personalized experiences</strong>, (3) <strong>making Nubank the preferred payments partner and growth engine for merchants</strong>, and (4) <strong>ensuring scalable, compliant, and financially healthy foundations</strong>. This role will own the technical plan to deliver that vision across<strong> NuPay, Ads &amp; Rewards and Insurance</strong>.</p> <h2><strong>Mission design and operationalize the 2–3 year technical end‑state for the Digital Ecosystem so that:</strong></h2> <ul> <li>NuPay scales to become the de facto checkout and wallet for Nubank customers (TPV ×2 by Dec/26; wallet &gt;3M MAU),</li> <li>Ads &amp; Rewards delivers the Advantages Tab, a performant advertiser platform and Ads POC with merchants, and drives material ecosystem revenue,</li> <li>Insurance launches and scales high‑quality one‑click complements (Mobile Insurance Relaunch, Pix Protegido evolution), while maintaining aggressive SLOs, strong observability, controlled TCO and an elevated engineering culture.</li> </ul> <h2><strong>Core responsibilities</strong></h2> <ul> <li>Support defining the division’s technical end‑state (2–3 years): architecture, shard/partition strategy, migration path (one‑stack) and explicit trade‑offs (cost × latency × availability).</li> <li>Co-own availability and performance: set SLIs/SLOs, error budgets, runbooks, incident playbooks and an observability strategy that supports merchants with strict SLAs.</li> <li>Support Ads &amp; Rewards platform design: advertiser platform (audience &amp; campaign management), decision/bidding service, real‑time vs batch decisioning, measurement &amp; attribution (ROAS/incrementality), and minimise impact on app