Senior Software Developer

Senior Software Developer at Zeffy responsible for building and scaling technology that supports nonprofits. You’ll Own projects from idea to production, make pragmatic, high-quality decisions, and mentor teammates to maintain Zeffy’s simple-and-fast culture. The role highlights a track record of delivering impactful features and systems (e.g., rich-text email builder, payment flow improvements, rate limiter enhancements, and scalable infrastructure) in a fast-paced environment. Stack includes React/Next.js (Typescript), Nest.js (TypeScript), PostgreSQL, Algolia, and CI/CD with GitHub Actions and Cypress. Prior experience with these technologies isn’t required to start; focused onboarding and internal bootcamps are provided. Location is Paris with flexible, hybrid work in the Paris 11ème office; the description emphasizes ownership, rapid iteration, mentorship, and delivering value to nonprofits. The role also outlines a structured recruitment process and a culture of prioritizing clarity, efficiency, and impact.