Staff Fullstack Software Engineer (Core Performance)

Join Dropbox as a Staff Fullstack Software Engineer, where you'll be the technical owner of application performance across the Core organization. You'll focus on improving the performance of the web application, leading the performance initiative across iOS, Android, and desktop, and influencing cross-org roadmaps and architectural decisions. This role offers meaningful exposure to senior leadership and the opportunity to shape how Dropbox thinks about performance for years to come.

• Drive performance improvement on the Dropbox web application as the first focus of the role — profiling React surfaces, producing flame graphs and heat maps, identifying the highest-impact opportunities, and shipping measurable improvements.
• Lead the performance initiative across iOS, Android, and desktop by coordinating with internal platform experts who own those clients — setting strategy, defining measurement standards, and driving execution rather than implementing every fix personally.
• Build and own the measurement, instrumentation, and regression-detection systems that engineering teams across Core depend on to ship performant code.
• Has worked on a consumer user-facing product (versus a platform team or developer-facing API-based product), and shipped changes that moved customer-visible metrics
• Demonstrated experience using AI tooling to accelerate performance work — applying LLMs and AI-assisted workflows to profiling analysis, root-cause investigation, refactoring, or shipping performance fixes
• Demonstrated, hands-on experience driving measurable performance improvements in production web applications — including profiling JavaScript and React surfaces, identifying root causes through flame graphs, heat maps, traces, and RUM data, and shipping the fixes that moved the metric
• Minimum of 12 years of experience as a software engineer with 3+ years serving as a Senior
• Production experience with modern backend services in Python or Go that support consumer-facing client surfaces
• Experience optimizing AI-assisted engineering workflows to improve the productivity of other engineers — selecting tools, defining patterns and guardrails, and measuring the impact on engineering throughput
• Strong written and verbal communication skills, with a track record of influencing roadmaps and decisions outside their direct reporting line — including leading initiatives that depend on coordinating with platform owners they don't directly manage
• Experience leading technical strategy on cross-cutting initiatives spanning multiple teams or surfaces, including writing design docs, defining architecture, and driving execution to measurable outcomes
• BS, MS, or PhD in Computer Science or a related technical field involving coding (e.g., physics or mathematics) or equivalent technical experience
• Experience profiling and improving native iOS applications (Swift), including startup time, scroll performance, and memory behavior
• Experience profiling and improving native Android applications (Kotlin), including startup time, scroll performance, and memory behavior
• Experience profiling and improving desktop client applications, including startup, IPC, and resource usage
• Experience building or owning performance regression-detection systems integrated into CI/CD
• Experience with RUM telemetry pipelines, sampling strategy, and statistically rigorous comparison of performance data
• Track record of mentoring senior engineers (Senior and above) and raising the technical bar across an engineering organization