Senior Software Engineer, Marketing Platform Tooling

<div class="content-intro"><p><strong>We're transforming the grocery industry</strong></p> <p><span class="im">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.</span></p> <p>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.</p> <p><strong>Instacart is a Flex First team </strong></p> <p>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. <a href="https://www.instacart.careers/flex-first" target="_blank" data-saferedirecturl="https://www.google.com/url?q=https://instacart.careers/remote/&source=gmail&ust=1651869232122000&usg=AOvVaw37OlxP8hAKN7nq4YwHQH7e">Learn more about our flexible approach to where we work.</a></p></div><h2><strong>Overview</strong></h2> <p>The Marketing Platform Tooling team builds and maintains the core backend systems that power all of Instacart's marketing capabilities. At the center of this work are two production-scale platforms: the Targeting Platform (TaaS), which manages roughly 46,000 segment definitions to reach the right customers with the right content at the right time, and the CRM Messaging Service (CRMS), which sends approximately 8 million messages per day across Instacart and white-label retailers. Together, these systems form the foundation for how Instacart drives growth, engagement, and retention at scale.</p> <p>We are now building the Unified Marketing Backend (UMB) — a shared, composable foundation designed to serve as the backbone for the entire marketing platform space. This is greenfield infrastructure work with direct visibility into Instacart's most critical company priorities, including Enterprise expansion, Lifecycle marketing, and platform Efficiency and Quality.</p> <p>We are looking for a Senior Software Engineer to join this team in Toronto as a dedicated backend owner. This is a net new role on a team of approximately 10 engineers, and you'll be stepping into a high-ownership position with real scope, real urgency, and a roadmap that ladders directly into business outcomes. If you're energized by building sustainable platforms at scale, running workstreams end-to-end, and making a measurable difference on systems other teams depend on, this is the role for you.</p> <h2><strong>About the Job</strong></h2> <ul> <li>Architect, build, and maintain high-quality backend systems for the Targeting Platform (TaaS) and CRM Messaging Service (CRMS), taking core workstreams from idea to production with a high degree of independence — this includes the CC API V3 to V4 migration, CRM white-label scale-out to 80+ retailers, Project Lotus Phase 2, and self-serve ad hoc tooling.</li> <li>Play a central role in designing and building the Unified Marketing Backend (UMB), a composable platform that will serve as the shared foundation for all of Instacart's marketing infrastructure and on which other teams will build.</li> <li>Own critical platform capabilities end-to-end, including real-time targeting, campaign health and observability, API and eventing integrations, and CRM white-label expansion — work that is high visibility both internally and with external retailer partners like Sprouts, PFG, and Metro.</li> <li>Collaborate extensively across backend and full-stack engineering, Product, Design, and adjacent platform teams (including MET/Martech, Treatment Serving, Retailer Storefront/Enterprise, and Professional Services) as well as external vendors such as Braze and CDP tooling — driving alignment and delivering effective cross-functional outcomes.</li> <li>Step into a fast-moving environment where you'll be expected to balance ongoing platform stability work with a growing H2 roadmap, help reduce execution risk on two of Instacart's most critical systems, and contribute to building a sustainable on-call rotation as the team scales.</li> </ul> <h2><strong&gt