Sr Software Engineer II - Ads Manager (Front End)

We're transforming the grocery industry At Instacart, we invite the world to share love through food because we believe everyone should have access to the food they love and more time to enjoy it together. Where others see a simple need for grocery delivery, we see exciting complexity and endless opportunity to serve the varied needs of our community. We work to deliver an essential service that customers rely on to get their groceries and household goods, while also offering safe and flexible earnings opportunities to Instacart Personal Shoppers. Instacart has become a lifeline for millions of people, and we’re building the team to help push our shopping cart forward. If you’re ready to do the best work of your life, come join our table. Instacart is a Flex First team There’s no one-size fits all approach to how we do our best work. Our employees have the flexibility to choose where they do their best work—whether it’s from home, an office, or your favorite coffee shop—while staying connected and building community through regular in-person events. Learn more about our flexible approach to where we work. Overview The Ads Manager team builds the core self-serve platform that brands, agencies, and retailers use to create, manage, and optimize their advertising campaigns on Instacart. We own the campaign creation flows, creative management, reporting dashboards, and design system foundations that power it. We are hiring a Senior Frontend Engineer II (L6) to co-own the technical roadmap for our advertiser-facing experience, modernize our frontend architecture, and scale complex campaign management and reporting interfaces while elevating our component library, design system, performance, and accessibility across the platform. You’ll partner closely with Product, Design, Backend, and Data Science teams to build reusable UI abstractions and deliver high-impact features across pillars such as Campaign Activation, Creative & Reporting, Design System & Platform, Performance & Accessibility, and novel AI initiatives. About the Job As a Senior II Frontend Engineer (L6) on the Ads Manager team, you will own the team’s frontend technical direction and lead large, multi-quarter initiatives that shape how advertisers plan, launch, and optimize campaigns on Instacart. You’ll define key architectural patterns, improve developer productivity and observability, and act as a primary technical partner to product, design, data science, and backend teams. Lead the technical roadmap and architecture for Ads Manager’s web applications, balancing near-term delivery with long-term scalability and extensibility. Design, build, and maintain high-quality React UIs for campaign creation, management, reporting, and optimization. Define and evolve shared components, state management, and abstractions that make the surface easier to extend and maintain. Partner with backend teams on API and data contracts that enable robust, observable, and cost-efficient systems. Collaborate with other frontend leads and peers across the company to build alignment on frontend standards and best practices. Champion observability, performance, and reliability for Ads Manager, including metrics, logging, tracing, and on-call readiness for critical flows. Proactively drive modernization and technical debt paydown, including migrations and refactors of legacy frontend code. Embed security-by-design into frontend architecture and lead response for significant security or reliability issues touching Ads Manager UI. Propose and lead team-wide and cross-team initiatives on behalf of the EM, aligning stakeholders and driving execution across Ads and partner teams. Actively work with designers to build a best-in-class experience for users. Mentor and sponsor engineers up to L5, improve onboarding and team practices, and help resolve cross-team execution issues. Help define how the team uses AI-assisted development tools (for code, tes