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, it’s what we call Zeffy perfectionism, perfection in impact. 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 months cycle, to make sure we prioritize radically. We set ourselves targets on the 4 following dimensions: efficiency, security, stability and performance. Trust and ownership: every target is clear and owned by one person who has full autonomy to reach it. Owned by one person doesn’t mean working alone on it. Continuous improvement: We regularly review and refine our processes, promoting a culture of learning and growth through feedback. Our Stack Frontend: React/Next.js (Typescript) Backend: Nest.js (TypeScript) Database: PostgreSQL, Algolia CI/CD: GitHub Actions, Cypress We’re looking for someone with at least 8 years of experience as a developer in SaaS or web-based products that serve high-volume and rapidly growing user bases. We move fast by keeping things simple, and we want someone who embodies that mindset: someone who knows when structure adds value, when it gets in the way, and how to guide others toward the right balance. 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. #J-18808-Ljbffr