Staff Fullstack Software Engineer, Core Performance

Dropbox is a company focused on creating a more enlightened way of working, and they are seeking a Staff Software Engineer to own application performance across their Core organization. This role involves driving performance improvements on various platforms, defining measurement standards, and leading initiatives to enhance the engineering workflow using AI.

Responsibilities:

• 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
• Take performance improvements end-to-end: from measurement, to root-cause analysis, to shipped code changes, to validation in production telemetry
• Build and own the measurement, instrumentation, and regression-detection systems that engineering teams across Core depend on to ship performant code
• Write production code regularly — primarily JavaScript and React on the web, with backend work in Python and Go on the services those surfaces depend on
• Set engineering standards for performance work across Core Engineering, and mentor IC3 and IC4 engineers on profiling, measurement methodology, and performance-aware system design
• Apply AI tooling to performance work and lead the optimization of AI-assisted engineering workflows across Core, raising engineering throughput and shaping how Dropbox engineers use AI to ship better software faster
• Influence cross-org roadmaps and architectural decisions, partnering with engineering leaders, PMs, and designers to ensure performance is treated as a first-class product attribute

Requirements:

• BS, MS, or PhD in Computer Science or a related technical field involving coding (e.g., physics or mathematics) or equivalent technical experience
• Minimum of 12 years of experience as a software engineer with 3+ years serving as a Senior
• 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
• 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
• 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
• Production experience with modern backend services in Python or Go that support consumer-facing client surfaces
• 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
• 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
• 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 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