Founding, Full Stack Engineer (React.js & Python)
Summary
Build and scale an AI-powered sales automation platform using React.js, TypeScript, and Python, owning core features from frontend to backend in a fast-moving startup.
Full Stack Engineer (React.js, TypeScript, Python) – YC AI Scale-up – Amsterdam, NL
Experience: 3+ years – React.js, TypeScript, Python
Employment type: Full‑Time
Job Overview
Our client develops AI sales employees for Europe. Their first product is an AI SDR that owns the entire outbound process – from researching relevant companies to executing campaigns on email, LinkedIn, and via letters. We are seeking a highly skilled and proactive founding software engineer to join our YC‑backed startup full‑time and in person in Amsterdam. This is a fantastic opportunity to make a substantial impact in a fast‑paced, early‑stage startup environment.
Responsibilities
- Own and develop core product features on both the frontend and backend.
- Collaborate with founders and customers to conceptualise, design and implement new features.
- Maintain and improve the codebase for optimal performance.
- Conduct code reviews and perform debugging tasks.
Required Qualifications
- Proven track record in full‑stack development, preferably as a Senior Software Engineer.
- Comprehensive knowledge of TypeScript, React, and server‑side development (preferably Remix).
- Proficiency in designing multi‑tenancy SaaS products.
- Experience leveraging latest AI code IDEs (Cursor, Windsurf, Claude, IntelliJ, Junie).
- Experience operating software in a scalable manner.
- Fluent in English; able to communicate complex technical concepts clearly and effectively.
Bonus Skills and Experience
- Proficiency in Python.
- Experience hosting applications on Azure.
Application
Submit a copy of your CV directly to this advertisement or email david@wearesyntera.com. This role is actively interviewing and can be offered within 7‑10 days.
Location
Amsterdam, North Holland, Netherlands – On‑site role.