Shape application security remotely in Canada through TypeScript, Go, and tenant isolation for a platform serving hundreds of enterprises. As the first dedicated security hire, you will own application security end to end and report to the VP of Engineering. This Lead-level role combines backend engineering with threat modeling, authorization design, privacy controls, and distributed systems security. You will influence products early while shipping production fixes yourself. Key Responsibilities:

Own application security across every product team Read and write production TypeScript and Go Threat model products and major redesigns Design sub-tenant access controls for enterprise customers Improve rate limiting and abuse detection Requirements:

Six or more years in security engineering Backend software engineering experience with production systems Experience securing multi-tenant platforms across clouds or regions Early security hire experience at SaaS or data infrastructure companies Staff or Lead level reached through promotions Lead secure backend development through tenant isolation, authorization, threat modeling, and hands-on TypeScript and Go engineering.

📌 Lead Application Security Engineer (Toronto)
🏢 The French Sourcer
📍 Toronto