Staff Software Engineer

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 simple, 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