Staff Fullstack Software Engineer, Core Performance

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Staff Fullstack Software Engineer, Core Performance based in Canada. This is a high-impact, organization-defining technical leadership role focused on making large-scale consumer products feel fast, responsive, and reliable across every user surface. You will own performance across web, mobile, desktop, and backend systems, shaping how hundreds of millions of users e…