Principal Software Engineer

Fulfillment IQ

. Own technical direction and architecture evolution of a live, revenue-generating integration platform .

Posted 9/25/2026full-timeToronto • CanadaLead💰 CA$175,000 - CA$210,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive experience in building and operating cloud-native backend systems, with a focus on scaling production SaaS platforms and ensuring reliability through observability and incident management. Proficient in performance engineering and capable of leading technical direction and architecture evolution for integration platforms.

Highest-signal resume keywords

Cloud-Native Backend SystemsPerformance EngineeringMulti-Tenant SaaS ExperiencePython and JavaScript/TypeScriptHigh-Throughput Distributed Systems

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Performance EngineeringLoad TestingCapacity PlanningEvent StreamingMessage QueuesIdempotencyRetriesBackpressureTenant IsolationFault-Tolerant Design

Soft Skills

MentorshipLeadershipCollaboration

Tools & Technologies

KafkaETL/Data PipelineAPI PlatformIntegration Platform

Industry Keywords

SaaSObservabilitySLOsIncident ManagementSupply Chain Systems

Tech Stack

Tools & technologies

CloudDistributed SystemsETLJavaScriptKafkaNext.jsPythonTypeScript

About the role

Key responsibilities & impact

Own technical direction and architecture evolution of a live, revenue-generating integration platform
Scale throughput and reliability while customers onboard, including zero-downtime changes to running systems
Harden the platform through tenant isolation, rate limiting, security, and data integrity improvements
Establish observability, SLOs, and incident practices as the customer base grows
Lead performance and capacity work ahead of demand
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
Build deep command of the codebase and production topology
Ship production changes and document scaling and reliability risks
Deliver major scaling or reliability improvements and establish observability and SLO baselines
Own and execute an enterprise-readiness roadmap with measurable gains in throughput, latency, or stability
Report against platform uptime, reliability, throughput, latency, onboarding velocity, incident frequency, recovery time, and enterprise scalability readiness

Requirements

What you’ll need

10+ years building and operating cloud-native backend or platform systems
Experience scaling a production SaaS or data platform through rapid customer growth
Experience with hardening, re-architecture under load, and maturing an early product to enterprise grade
Deep hands-on experience with high-throughput distributed systems
Experience with event streaming or message queues, async processing, idempotency, retries, and backpressure
Strong performance engineering skills, including profiling, load testing, horizontal scaling, and capacity planning
Production reliability ownership, including observability, SLOs, incident management, and 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
Experience with an integration platform, ETL/data pipeline product, or API platform (nice to have)
Kafka or similar streaming infrastructure at scale (nice to have)
Supply chain or logistics systems exposure, including WMS, OMS, TMS, or EDI integrations (nice to have)
AI-assisted engineering workflows (nice to have)
Experience shipping AI/LLM-driven capabilities in production, including RAG, generation pipelines, or 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
Employee stock options (ESOP), where applicable
Team events, meetups, and company offsites
Mentorship and leadership development
Equal opportunity and inclusive work environment
Recruitment accommodations available on request