Principal Software Engineer - Zynque

Fulfillment IQ; Toronto; Hybrid; CAD 175,000 - 210,000; Full time

Job summary

Fulfillment IQ seeks a Principal Software Engineer to scale its iPaaS—Zynque. You will own the architecture as production load grows, partnering with clients to harden a live platform that enterprises trust for logistics operations.

You will lead performance, reliability, and security enhancements, guiding a scale-up from a young system toward enterprise readiness with tenant isolation and robust observability.

Qualifications

• 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.

Responsibilities

• 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.

Skills

Cloud-native systems

Production SaaS scaling

High-throughput distributed systems

Performance engineering

Observability & SLOs

Multi-tenant SaaS

Hands-on coding

Tools

Kafka

Job description

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-performancelogisticsoperations.

We work at the intersection of strategy, operations, and technologywhere wesolvecomplex, real-world problems across warehouse design, automation, order management, transportation, and end-to-end supply chain execution.

Our teams combine deep domainexpertisewith 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,thisistheplace where your skills and judgment trulycome 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
• 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
• Experience shipping AI/LLM-driven capabilities in production (rag, generation pipeline, agentic workflows)
  

Key Responsibilities:

• 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

What Success Looks Like in the First 90 Days:

• 30: Deep command of the codebase and production topology; shipping to production; documented view of the top scaling and reliability risks
• 60: First major scaling or reliability improvements live; observability and SLO baseline established
• 90: Enterprise-readiness roadmap owned and in motion; measurable gains in throughput, latency, or stability
  

Key Performance Indicators (KPIs):

• Platform uptime and reliability
• Throughput and latency under growing customer load
• Customer and integration onboarding velocity
• Incident frequency and time to recovery
• Enterprise scalability readiness

Why You'll Love Working Here:

At Fulfillment IQ, we don't just build supply chain solutions. We build careers, friendships, and unforgettable experiences.

We believe in giving our senior technical leaders real ownership, real influence, and the opportunity to shape platforms that power real-world logistics operations.

As an equal opportunity employer, we celebrate diversity and are committed to creating an inclusive environment for all team members.

Here's what makes working with us a rewarding experience:

Work That Matters

Build systems that directly impact global commerce and supply chain performance.

Career Growth That Matters

We invest in mentorship, leadership development, learning budgets, and long-term career growth.

Flexibility to Thrive

We support remote and hybrid work models by offering multiple office locations to help you perform at your best.

We Celebrate You

From team wins to work anniversaries, we recognize impact, celebrate milestones and reward performance.

A Collaborative Culture

Work alongside talented engineers, product leaders, and award-winning domain experts who value ownership, transparency, and high standards.

Perks you'll appreciate:

• Employee Health:Comprehensive health and dental coverage for you and your family
• Time Off:Competitive paid time off and flexible leave policies
• Retirement:Retirement savings programs and employer contributions
• Professional Growth:Dedicated learning and development budget
• Flexible Work:Remote and hybrid work options
• Perks:Equipment allowances, internet reimbursements, business travel coverage, and employee stock options (ESOP), where applicable.
• Community Engagement:Team events, meetups, and company offsites

Use of Artificial Intelligence in Hiring:

FIQ uses artificial intelligence toassistin the screening, assessment, and shortlisting of applications for this position, including features within our applicant tracking system. AI supports human reviewers and does not make hiring decisions on its own. Final hiring decisions are made by FIQ personnel. If you have questions about how AI is used in this process, contact [e-mail].

Accommodations:

FIQ is committed to an inclusive and accessible recruitment process. Consistent with the Accessibility for Ontarians with Disabilities Act (AODA) and the Ontario Human Rights Code, accommodations are available on request at any stage of recruitment and assessment. Contact [e-mail] and we will work with you to meet your needs.

Candidate Privacy:

Your personal information is collected and used for recruitment purposesin accordance withFIQ'sCandidate PrivacyNotice, availablehere, andin accordance withapplicable Canadian privacy law (PIPEDA). This includes the use of AI-assisted screening described above and cross-border storage or processing that may occur in the United States. By applying, you acknowledge this notice. Questions: [e-mail].

Fulfillment IQ is a people-first company built on trust, collaboration, and ownership. We are proud to be an equal opportunity employer and are committed to building a diverse, inclusive, and high-performing workplace. We consider all qualified applicants without regard to any ground protected under the Ontario Human Rights Code, including race, ancestry, place of origin, colour, ethnic origin, citizenship, creed, sex, sexual orientation, gender identity, gender expression, age, marital status, family status, or disability.