Principal Engineer

Fulfillment IQ

Principal Engineer leading architecture evolution of Fulfillment IQ's integration platform. Focused on scaling a cloud-native, revenue-generating platform with strong engineering standards and mentorship.

Posted 7/20/2026full-timeToronto • 🇨🇦 CanadaLead💰 CA$175,000 - CA$210,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in scaling cloud-native backend systems, ensuring production reliability, and implementing performance engineering practices. Proficient in Python and JavaScript/TypeScript, with a strong focus on multi-tenant SaaS architecture and observability.

Highest-signal resume keywords

Cloud-Native Backend SystemsPerformance EngineeringProduction Reliability OwnershipMulti-Tenant SaaS ExperienceHigh-Throughput Distributed Systems

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

PythonJavaScriptTypeScriptEvent StreamingMessage QueuesAsync ProcessingLoad TestingCapacity PlanningFault-Tolerant DesignTenant Isolation

Soft Skills

MentorshipLeadershipCollaboration

Tools & Technologies

KafkaETLAPI PlatformsIntegration PlatformsAI/LLM-Driven Capabilities

Industry Keywords

SaaSData PlatformObservabilityIncident ManagementScaling RisksTechnical Debt

Tech Stack

Tools & technologies

CloudDistributed SystemsETLJavaScriptKafkaNext.jsPythonTypeScript

About the role

Key responsibilities & impact

Own technical direction and architecture evolution of a live, revenue-generating platform
Scale throughput and reliability while customers onboard, including zero-downtime changes to running systems
Harden the platform: tenant isolation, rate limiting, security, data integrity
Establish observability, SLOs, and incident practices as the customer base grows
Lead performance and capacity work ahead of demand, not behind it
Raise engineering standards through design reviews and mentorship
Partner with Product to balance platform investment against feature delivery
Identify and retire scaling risks and technical debt before they compound

Requirements

What you’ll need

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
Built or scaled an integration platform, ETL/data pipeline product, or API platform (connectors, transformation pipelines, webhooks) (Nice to Have)
Kafka or similar streaming infrastructure at scale (Nice to Have)
Supply chain or logistics systems exposure (WMS, OMS, TMS, EDI integrations) (Nice to Have)
AI-assisted engineering workflows; AI is deeply embedded in how we build (Nice to Have)
Experience shipping AI/LLM-driven capabilities in production (rag, generation pipeline, agentic workflows) (Nice to Have)

Benefits

Comp & perks

Comprehensive health and dental coverage for you and your family
Competitive paid time off and flexible leave policies
Retirement savings programs and employer contributions
Dedicated learning and development budget
Remote and hybrid work options
Equipment allowances, internet reimbursements, business travel coverage, and employee stock options (ESOP), where applicable.