Principal Software Engineer - Zynque

General Information: Job Title: Principal Software Engineer - Zynque Location: Toronto (Onsite/ Hybrid) Job Type: Full-Time Hiring Timeline: Immediate Reporting Line: General Manager at Zynque Existing Vacancy: Yes Application Deadline: Open until Filled Salary Range : $175 – $210K CAD per year (negotiable) About Fulfillment IQ (FIQ): Fulfillment IQ is a supply chain engineering and transformation company that helps brands, retailers, and 3PLs design, build, and scale high-performance logistics operations. We work at the intersection of strategy, operations, and technology where we solve complex, real-world problems across warehouse design, automation, order management, transportation, and end-to-end supply chain execution. Our teams combine deep domain expertise with strong technical capability, delivering outcomes through consulting, systems implementation, and proprietary platforms that accelerate time-to-value and reduce delivery risk. If you enjoy working in complex environments, partnering closely with clients, and seeing your work make a tangible impact on how global commerce moves, this is the place where your skills and judgment truly come to life. Role Overview Zynque is FIQ's integration platform (iPaaS) for supply chain and logistics. After a year of development, it is live in production with active customers onboarding, and it now needs to grow into an enterprise-grade, high-throughput platform. This is not a greenfield role, and it is not a maintenance role. It is a scale-up role: take a young production platform and harden it into a system that enterprises trust with their operations. You will own the architecture as it evolves under real load, with real customers, while the platform keeps shipping. Must Have: 10+ years building and operating cloud-native backend or platform systems Owned the scaling of a production SaaS or data platform through rapid customer growth: hardening, re-architecture under load, and maturing an early product to enterprise grade Deep hands-on experience with high-throughput distributed systems: event streaming or message queues, async processing, idempotency, retries, backpressure Strong performance engineering: profiling, load testing, horizontal scaling, capacity planning Production reliability ownership: observability, SLOs, incident management, fault-tolerant design Multi-tenant SaaS experience, including tenant isolation and noisy-neighbor problems Proficiency in Python and JavaScript/TypeScript (Next.js) Hands-on daily coder with founder-level ownership; comfortable in low-process, high-ambiguity environments Nice to Have: Built or scaled an integration platform, ETL/data pipeline product, or API platform (connectors, transformation pipelines, webhooks) Kafka or similar streaming infrastructure at scale Supply chain or logistics systems exposure (WMS, OMS, TMS, EDI integrations) AI-assisted engineering workflows; AI is deeply embedded in how we build …