Zeffy Tech Stack

Free fundraising platform built for nonprofits, scaling fraud detection and payment processing

Software Development Montreal, Quebec 51–200 employees Privately Held

Zeffy provides free fundraising software to nonprofits across North America. The tech stack—React, Next.js, Nest.js, PostgreSQL, with Algolia for search—is lean and focused on shipping fast. Active migration from GraphQL to tRPC signals simplification of their backend; concurrent work on fraud detection, payment dispute handling, and iOS tap-to-pay reveals a platform maturing from core fundraising into payments and risk infrastructure. Hiring is decelerating but skews senior and managerial, suggesting consolidation around reliability and support quality rather than growth-at-all-costs.

Tech Stack 12 technologies

Core StackReact Next.js Nest.js PostgreSQL GitHub Actions Cypress TypeScript Algolia iOS

AdoptingtRPC

ReplacingGraphQL

What Zeffy Is Building

◆Challenges

Lack modern tools for nonprofits
New fraud patterns
Payment dispute processing time
Improving user activation
Backend performance improvement
Simplify development process
Migrating backend from graphql to trpc
Improving support processes
Reducing manual review
Fraud detection time

▲Active Projects

Lead brand design & art direction
Improving support processes
Ai assistant for donor communications
Streamlined payment dispute handling
Tap to pay on ios
Performance dashboard
Automated nonprofit background checks
Cut fraud detection time in half
Visual identity evolution
Web experience design

Hiring Activity

Decelerating15 roles · 4 in 30d

Department

Engineering

Design

Support

Data

Ops

Product

Security

Seniority

Senior

Manager

Mid

Principal

Staff

Junior

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About Zeffy

Zeffy develops free fundraising software for nonprofit organizations globally. The product combines donation collection, donor management, and payment processing in a single interface designed for nonprofits without dedicated development or finance teams. The company operates on a freemium model—the core platform is free; revenue likely comes from payment processing fees and upsells. Active projects span brand evolution, iOS payment features, automated compliance checks, and fraud detection tooling, indicating expansion beyond basic fundraising into payments infrastructure and risk management. Support and operations are staffed alongside engineering, reflecting a service-first operational philosophy.

HeadquartersMontreal, Quebec

Company Size51–200 employees

Hiring MarketsFrance, Canada

Frequently Asked Questions

What tech stack does Zeffy use?

React, Next.js, Nest.js, PostgreSQL, and Algolia for search and donation discovery. They're migrating backend code from GraphQL to tRPC and recently adopted tRPC to simplify API layer complexity.

Where is Zeffy headquartered?

Montreal, Quebec, Canada. The company also actively hires in France, indicating European expansion of product or support operations.