As a Senior Back-end developer, you'll be a vital part of our team, working together to build Donna, our perfect AI-sales assistant for field sales reps. Donna empowers them to focus on what they do best - selling.

Expect to tackle diverse challenges in back-end engineering while helping shape the infrastructure behind our AI systems. You’ll work on integrating Large Language Models (LLMs) and scaling the real-time systems that power Donna’s voice and conversational capabilities.

If you're ready to embark on an exciting journey from the early days and make a significant impact in a growing team with global ambitions, Donna is the place for you!

What you’ll be doing

A non-exhaustive list of features we could use your help with:

• Design and implement the overall architecture of our web applications and integrations, ensuring they are responsive and maintain high-quality code standards.
• Adding support for new data source ingestion and assisting in maintaining clarity in our data layer.
• Scale and optimize our voice-to-voice pipeline and AI infrastructure to support real-time, low-latency interactions across multiple communication channels.
• Help design and scale the infrastructure that powers Donna’s AI systems (LLMs, voice pipelines, and data processing), ensuring reliability, observability, and performance in production.
• Contribute to team growth by mentoring junior developers and AI engineers, helping them design scalable systems and production-ready architectures.
• Experiment with new technologies to get the most out of our stack.

• We believe in shipping fast to gather feedback quickly from our customers.
• We like to keep things simple, so we leverage as much as possible the services offered by key vendors.
• You’ll report directly to our CTO, but you’ll work together with other departments (and customers) in detailing the requirements of features and make trade-offs together in order to maximise value while minimising complexity.

• We’re looking for someone with at least 5 years of experience building and scaling backend systems in production environments.
• You have a strong understanding of distributed systems, cloud infrastructure, and data-intensive applications. You’re comfortable working in a TypeScript/Node.js environment. Experience designing systems for AI/LLM-powered products, real-time pipelines, or voice infrastructure is a strong plus.
• We have a data-heavy backend, so a strong affinity for data architectures, pipelines, and large-scale data processing is important.
• Experience in a startup or scale-up environment is a plus. It is important you can embrace the start-up culture. While we try to keep technical debt in check, there are times we need to ship quickly and make pragmatic tradeoffs.
• You’re able to break down big initiatives into small tasks, allowing for re-prioritization as important opportunities arise.
• We have global ambitions, so fluency in English is a must.
• Ability to work with us in the Ghent office; this is not a remote position.

What you can expect

• Impact: Be part of an early-stage rocket ship startup where your contributions directly shape the company’s success. We’re moving fast, with crazy clients already signing up, so every line of code and every idea you bring has immediate impact.
• Growth: Join a rocket ship at the scale-up stage: learn from seasoned entrepreneurs and grow your career as we expand globally. The speed at which we’re onboarding clients means you’ll learn more in months than most do in years.
• Culture: Join a collaborative and supportive team that values innovation, creativity, and fun.
• Ecosystem: As a part of the Donna team, you’ll become a part of the Ghent tech ecosystem, and a member of the StarApps and Wintercircus ecosystem.

Next to the above very awesome perks, we offer a competitive salary with the following benefits:

Healthcare benefits plan
• A membership to the Collective (Wintercircus)
Employee Stock Option Plan (ESOP) Meal vouchers Annual company retreat Free office snacks Team drinks and events (like teambuildings, dev days, our off-site hackathons)