Senior Back-end Developer

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 and integrate Large Language Models (LLMs) into our products. Your objective will be to ensure our product remains scalable and performant, contributing to an optimal user experience.

You’ll join our ambitious Donna team as one of the early hires. This means you’ll have the opportunity to be part of an early-stage start-up and to learn from experienced serial entrepreneurs.

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 to support real-time, low-latency interactions across multiple communication channels.

• Contribute to team growth by mentoring junior developers, reviewing pull requests, and championing best practices in architecture and development.

• 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 full stack applications. You are fluent in Typescript, Node.js and AWS. Experience with meta-frameworks like Remix or Next.js is a plus.

• We have data-heavy back-end, so a good data affinity is important. Any experience with data pipelines and data architectures will be a big help.

• 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:

• Macbook 💻

• Healthcare benefits plan 🏥

• A membership to the Collective (Wintercircus)

• Meal vouchers 🍴

• Annual company retreat 🎊

• Free office snacks 🍰

• Team drinks and events (like teambuildings, dev days, our off-site hackathons) 🍺🎉

Why Donna?

We’re building something ambitious: an AI-native assistant that integrates naturally into the workflow of salespeople on the move. You’ll join a small, driven team where your work has immediate impact. Our culture values autonomy, pragmatism, and a builder’s mindset.

This role is for builders. If you’re the kind of engineer who still loves shipping great code - and wants to grow alongside a strong technical team - we’d love to hear from you.