About Zeffy

Zeffy is the fastest-growing nonprofit platform in North America, helping organizations raise funds, run events, and engage donors.

About The Role

As a Staff Software Engineer at Zeffy, you’ll work on key product features while playing a central role in elevating the engineering team. You’ll bring experience that helps others make better technical decisions, navigate complexity with confidence, and maintain our focus on building straightforward, high-quality solutions as we grow.

Development Principles at Zeffy

- We always optimize the ratio impact / effort, calling it Zeffy perfectionism.
- We build the simplest solution first to validate ideas quickly, keeping the codebase clean without solving problems that don’t exist yet.
- We are organized in 2‑month cycles to prioritize radically, setting targets on efficiency, security, stability, and performance.
- Trust and ownership: every target is clear and owned by one person with full autonomy, not working alone.
- Continuous improvement: we regularly review and refine our processes, promoting a culture of learning and growth.

Our Stack

- Frontend: React/Next.js (TypeScript)
- Backend: Nest.js (TypeScript)
- Database: PostgreSQL, Algolia
- CI/CD: GitHub Actions, Cypress

Preferred Experience (Qualifications)





- You have at least 8 years of experience as a developer in SaaS or web‑based products that serve high‑volume and rapidly growing user bases.
- You’ve shipped complex products at scale, learned from real‑world successes and failures, and developed sharp judgment about what truly matters.
- You bring seniority through expertise and perspective rather than hierarchy, making clear, pragmatic decisions that balance speed, quality, and long‑term thinking.
- You value clarity over cleverness, simplicity over complexity, and momentum over perfection.
- You mentor others with empathy, share your experience generously, and elevate the work of the whole team without adding unnecessary process.

What’s in it for you

- 4 weeks holiday + 1 week during Christmas time
- Competitive stock option program
- Health insurance (including dental plan)
- Online Medicine with Dialogue
- RRSP (REER) program
- Allowance for ecological transport (bike, transit)
- Wellness Budget
- Team volunteering four times per year
- Offsite summit once a year with the entire team
- Offices located in the heart of Plateau Mont‑Royal, with flexible, hybrid work possibility

Recruitment Process

- Call with Recruiter (45 min)
- Meeting with Hiring Manager (1.5h)
- Case Study (2h)
- Cultural interview with leadership (1h)
- Team lunch & Reference check
- Job offer

📌 Staff Software Engineer (Montreal)
🏢 Zeffy
📍 Montreal