[Remote] Staff Fullstack Software Engineer, Core Performance

Note: The job is a remote job and is open to candidates in USA. Dropbox is a leading file hosting service company, and they are seeking a Staff Software Engineer to own application performance across their Core organization. The role involves driving performance improvements for consumer-facing surfaces and collaborating with internal teams to establish measurement standards and optimize workflows using AI tools.ResponsibilitiesDrive 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 improvementsLead 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 personallyTake performance improvements end-to-end: from measurement, to root-cause analysis, to shipped code changes, to validation in production telemetryBuild and own the measurement, instrumentation, and regression-detection systems that engineering teams across Core depend on to ship performant codeWrite production code regularly — primarily JavaScript and React on the web, with backend work in Python and Go on the services those surfaces depend onSet engineering standards for performance work across Core Engineering, and mentor IC3 and IC4 engineers on profiling, measurement methodology, and performance-aware system designApply 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 fasterInfluence cross-org roadmaps and architectural decisions, partnering with engineering leaders, PMs, and designers to ensure performance is treated as a first-class product attributeSkillsBS, MS, or PhD in Computer Science or a related technical field involving coding (e.g., physics or mathematics) or equivalent technical experienceMinimum of 12 years of experience as a software engineer with 3+ years serving as a SeniorDemonstrated, 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 metricDemonstrated experience using AI tooling to accelerate performance work — applying LLMs and AI-assisted workflows to profiling analysis, root-cause investigation, refactoring, or shipping performance fixesExperience optimizing AI-assisted engineering workflows to improve the productivity of other engineers — selecting tools, defining patterns and guardrails, and measuring the impact on engineering throughputProduction experience with modern backend services in Python or Go that support consumer-facing client surfacesExperience leading technical strategy on cross-cutting initiatives spanning multiple teams or surfaces, including writing design docs, defining architecture, and driving execution to measurable outcomesHas worked on a consumer user-facing product (versus a platform team or developer-facing API-based product), and shipped changes that moved customer-visible metricsStrong 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 manageExperience profiling and improving native iOS applications (Swift), including startup time, scroll performance, and memory behaviorExperience profiling and improving native Android applications (Kotlin), including startup time, scroll performance, and memory behaviorExperience profiling and improving desktop client applications, including startup, IPC, and resource usageExperience building or owning performance regression-detection systems integrated into CI/CDExperience with RUM telemetry pipelines, sampling strategy, and statistically rigorous comparison of performance dataTrack record of mentoring senior engineers (Senior and above) and raising the technical bar across an engineering organizationCompany OverviewDropbox is a smart workspace company that provides secure file sharing, collaboration, and storage solutions. It was founded in 2007, and is headquartered in San Francisco, California, USA, with a workforce of 1001-5000 employees. Its website is https://www.dropbox.com.Company H1B SponsorshipDropbox has a track record of offering H1B sponsorships, with 13 in 2026, 121 in 2025, 105 in 2024, 103 in 2023, 166 in 2022, 197 in 2021, 157 in 2020. Please note that this does not guarantee sponsorship for this specific role.