Fullstack Software Engineer – Scala & AI-Powered Development

Overview

NuMind is a YC-backed AI startup building LLMs for information extraction. We develop nuextract.ai, a platform that helps companies extract structured information from documents at scale. We are a 10-person team, well funded, and based at Station F in Paris.

Role

We are looking for a Fullstack Software Engineer to help build and improve nuextract.ai .

This is a hands-on fullstack role for an engineer who cares about product and UX, and also about writing clean, well-architected software across the stack, with AI tools as a core part of modern development.

Responsibilities

• Build front-end and back-end features across the stack in a statically typed functional language (Scala)
• Contribute to product design and user experience across the platform
• Help shape architecture and technical decisions to ship robust, elegant features
• Use AI tools as part of your daily development workflow and help us improve how we build software with them
• Work autonomously, collaboratively, and with a focus on high-quality software

Qualifications

• Master’s-level engineering degree (Bac +5) or equivalent
• Very strong spoken and written English; everyday spoken French or willingness to learn
• Solid foundations in software engineering, including computer science, algorithms, and either experience with functional programming or a genuine desire to learn it
• Strong interest in AI-assisted software development, with hands-on use of tools such as Claude Code, Codex, or similar tools, or a clear willingness to adopt them quickly

Details

• Both front-end and back-end are in Scala, which lets us share code across the stack and benefit from a strongly typed functional language that works especially well with AI-assisted development tools.
• On the front-end, we use Laminar and web components; see this short guide for React developers
• On the back-end, we use Tapir and direct-style Ox
• Dedicated office at Station F (Paris 13)
• Partially remote, with 3 days on-site
• Salary: €45k–75k + stock options
• Permanent contract (CDI) with RTT

Hiring process

One initial qualifying video call, then three interviews, including at least one on-site, with our CEO, CTO, and lead engineer.