Sr Software Engineer II - Ads Manager (Front End)

📍 Remote within Canada, but Instacart is only hiring candidates based in Ontario, Alberta, British Columbia or Nova Scotia for this role.

🏢 About Instacart

Instacart is an online grocery company that links shoppers with local stores for delivery and pickup across North America. Its advertising business lets brands, agencies and retailers promote products to people shopping on Instacart.

🎯 The Role

This is a Senior II (L6) frontend position on the Ads Manager team, which owns the self-serve tools advertisers use to plan, launch and improve campaigns. You will steer the team's frontend direction, run multi-quarter initiatives and act as a main technical partner for product, design, data science and backend colleagues.

🛠️ Tech Stack

• React
• Node.js
• REST and GraphQL APIs
• Datadog or similar observability tooling
• Cypress, Playwright or Selenium for test automation
• Figma for design collaboration

💼 What You'll Do

• Plan the roadmap and architecture for the Ads Manager web apps, weighing quick delivery against long-term scale
• Build React screens for setting up, managing, reporting on and tuning ad campaigns
• Create reusable components, state patterns and abstractions that make the product easier to grow
• Agree on API and data contracts with backend teams
• Strengthen monitoring, logs, traces and on-call preparedness for the most important advertiser journeys
• Lead migrations and refactors to retire legacy frontend code, with security built in
• Coach engineers up to L5 and shape how the team uses AI coding tools

✅ What You'll Need

• At least 8 years building modern web applications and owning complex customer-facing products
• Deep React and Node.js experience in large codebases, including hooks, state handling and performance work
• Strong frontend architecture skills across modules, shared components, routing, data loading and error states
• Experience working with backend teams on REST or GraphQL APIs
• A record of leading large cross-team projects from design through launch and operations
• Experience improving code health and productivity through tooling, testing and CI
• Hands-on use of web monitoring tools such as Datadog
• Comfort with AI-assisted development and clear communication with engineers, PMs and designers

🌟 Nice to Have

• Experience leading large, data-rich interfaces like analytics dashboards, editors or multi-step workflows
• GraphQL experience at scale
• Test automation with Selenium, Cypress or Playwright
• Deep frontend performance work such as bundle optimization and code splitting
• Leading major migrations or design system rollouts
• Figma experience and a record of mentoring L3 to L5 engineers