Principal Software Developer

• Experience building point-of-sale, commerce, ecommerce, payments, inventory, or other transaction-heavy systems.
• Deep experience with distributed systems, offline-capable software, multi-region systems, or high-availability platforms.
• Experience working with hardware integrations, payment terminals, peripherals, or environments with unreliable network connectivity.
• Strong understanding of domain-driven design, event-driven architecture, data consistency, and migration strategies.
• Experience improving a large or legacy system through incremental modernization rather than a risky rewrite.
• Experience leading technical work across web, backend, mobile, and platform teams.
• Experience with people management or formal technical leadership responsibilities.
• You care deeply about the customer and understand that technical decisions should make merchants’ work simpler and more dependable.
• You are energized by complex systems and can make them easier for others to understand and improve.
• You combine high standards with pragmatism. You know when to invest in the foundation and when to make a focused trade-off to keep moving.
• You lead through influence, clarity, and trust rather than title.
• You are comfortable being accountable for outcomes that extend beyond your immediate team.
• You seek out difficult problems, step into ambiguity, and create momentum.
• You are a generous technical partner who makes the people around you stronger.
• You communicate directly and respectfully, especially when the stakes are high or opinions differ.
• You stay curious, learn from what happens in production, and continuously improve your own judgment.
• As a global company with employees and clients outside of Quebec, fluency in English as a working language is required for this position.

Fuel your growth. Find your people.

At Lightspeed, your growth is our priority. We invest in you with continuous learning opportunities, global mobility and benefits designed to support you—all within a driven, diverse and inclusive team that’s passionate about empowering our communities

Please note that we ask applicants to disclose any criminal convictions, and we conduct criminal record checks as part of our hiring process for this role.

To all recruitment agencies: Lightspeed does not accept unsolicited agency resumes. If we have not directly engaged your company in writing to supply candidates for a specific vacancy, Lightspeed will not be responsible for any fees related to unsolicited resumes.

Lightspeed is a proud equal opportunity employer and we are committed to creating an inclusive and barrier-free workplace. Lightspeed welcomes and encourages applications from people with disabilities. Accommodations are available on request for candidates taking part in all aspects of the selection process.

Where to from here?

Obviously, this has to be mutually beneficial: we want you to step into a role you love, and we want to offer you a place you’re proud to come to every day. For a glimpse into our world check out our career page here.

Lightspeed is building communities through commerce, and we need people from all backgrounds and lived experiences to do that. We were founded in 2005, in Montreal’s gay village and our original members were all part of the LGBTQ+ community. The ethos of our business has been about inclusion from the very beginning, and we strive to provide a workplace where everyone belongs.