Backend Software Engineer (Core AI)

<p>At Goodweek, we're building a next-generation AI tool designed to revolutionize business productivity. We are focusing on delivering a secure, scalable, and reliable system that supports real business use cases across different departments. The goal is to make AI practical, controlled, and truly embedded in how modern organizations operate.</p> <p>Our team spans across France, Spain, and the United States, and our vision is backed by 6 international investment funds.</p> <p>To accelerate our growth, we're looking for a talented Software Engineer to join our Engineering team and help us build an innovative product that will make a real impact on how thousands of users work every day.</p> <h2>Tasks</h2> <p><strong>About the role</strong> </p> <p>As a Backend Engineer, you'll work on the core infrastructure that makes our AI platform fast, reliable, and scalable. </p> <p>You'll be joining the Core AI team, responsible for the foundational layer of our AI product, covering orchestration, memory, low-level security, and system harness. </p> <p>This is a role for someone who thrives at the intersection of backend engineering and applied AI, thinking about latency, reliability, and model behavior all at once. </p> <p><strong>What</strong> <strong>you'll</strong> <strong>do</strong> </p> <p>You'll be tackling challenges across: </p> <ul> <li><strong>AI orchestration:</strong> owning the core layer that coordinates AI workflows, model calls, multi-step reasoning, and multi-agent delegation, including RAG pipelines and knowledge bases </li> <li><strong>LLM integration:</strong> integrating and tuning new LLMs into a production-grade backend, with a focus on security, guardrails, and evaluation (latency, response quality) </li> <li><strong>Data ingestion & export:</strong> building robust pipelines and services to handle a variety of file formats reliably and at scale </li> <li><strong>Context & token optimization:</strong> designing strategies to maximize LLM efficiency, manage context windows, and keep costs in check </li> <li><strong>Infrastructure & observability:</strong> designing scalable APIs, automating deployment pipelines, monitoring, and testing to keep the platform reliable and performant </li> <li><strong>Architecture & engineering culture:</strong> participating in tech stack decisions, documenting technical knowledge, and continuously driving innovation across the AI platform</li> </ul> <h2>Requirements</h2> <p><strong>Technical background</strong> </p> <ul> <li>5+ years of experience with Node.js + TypeScript stack </li> <li>NestJS/React and PostgreSQL are a plus </li> <li>Hands-on experience (or strong familiarity) with AI/ML integration (LLMs, RAG, or similar) </li> <li>Solid understanding of backend architecture, scalability, and security best practices </li> <li>Experience with databases, authentication, and cloud platforms (AWS) </li> <li>Familiar with CI/CD, Git workflows, and agile methodologies </li> <li>Bonus: familiarity with other backend programming languages applied to AI (Python, Go...)</li> </ul> <p><strong>Soft skills</strong> </p> <ul> <li>Strong technical communication </li> <li>Agile mindset focused on product and business value </li> <li>Ability to document and defend architectural decisions </li> <li>Balance between code quality and delivery speed </li> <li><strong>Technical English</strong> <strong>required</strong></li> </ul> <h2>Benefits</h2> <ul> <li>Health insurance provided by the employer</li> <li>Meal vouchers and transportation cost reimbursement (50%)</li> <li>Flexible working hours</li> <li>Hybrid remote work</li> <li>Daily use of English through close collaboration with teams in the US and Spain</li> </ul><p>Find <a href="https://www.arbeitnow.fr">Jobs in France</a> on Arbeitnow</a>