Full Stack Engineer

AI Native Senior Developer – AI-Driven SaaS Product – Brainial – Utrecht / Hybrid – up to euro 90k.

About the company

Brainial is a scale-up that has built, and keeps scaling, a successful AI-driven SaaS product. Our international customer base is growing rapidly, and we are backed by solid investments: recently funded, with 10x growth expected in the next 3–5 years.

The product gives knowledge workers a high degree of automation, so teams have much more time for human interaction. That leads to much more value creation within their organisations. One example of a valuable feature: filtering conflicting statements out of huge amounts of documents. For our clients, our AI SaaS product is a gamechanger.

The enormous attention for AI has paid off, but we have been working on this vision since 2019, long before the AI hype.

The role

As a Senior Fullstack Developer you strengthen a tech team of Data Scientists, Product Owners, Designers, and Fullstack Developers. You'll join a fun, enthusiastic group that builds high-quality features in a fast-paced environment.

You work across the whole stack: from Python services and data pipelines to the React interface where users interact with complex AI components. We aren't looking for someone who just picks up tickets. We need a senior engineer who leads by example, cares about the user experience, and enjoys helping less experienced developers grow.

What you'll do

• Build and maintain backend services and APIs in Go and/or Python and FastAPI
• Build intuitive, responsive frontend features in React and TypeScript
• Make sure the user experience connects smoothly with complex AI components
• Spot what's broken or inefficient and fix it, or write a clear plan to fix it, document it and share it with the team
• Improve CI/CD pipelines, write solid tests and do meaningful code reviews
• Use AI tools as a core part of how you design, code, test and document
• Coach and mentor other developers, frontend and backend
• Suggest and introduce new tooling where it makes the team better

Tech Stack: Go, Python, Pub / Sub event bus, PostgreSQL, Elastic Search, Pulumi and React.

What you bring

• Extensive experience with commercial, production-running systems. You know what great software looks like and can move existing systems to that level.
• Proven seniority in one typed backend language (Python and/or Go), plus solid React and TypeScript. You write clear, simple code without over-complicating things.
• A strong understanding of software architecture and design principles.
• Hands-on experience with databases, search engines and cloud platforms, preferably GCP.
• A proactive "boy scout" mentality: you leave the code better than you found it, within the agreed estimates.
• A true can-do attitude. You don't just identify problems; you get energy from solving them quickly.
• An interest in AI and Machine Learning, specifically LLMs and ReRankers, and the drive to keep learning.
• The ability and desire to mentor engineers and share your expertise generously.

Nice to have

• Experience with the Go and Elasticsearch is a strong plus
• Experience with React Query, Jotai or TailwindCSS
• Familiarity with Infrastructure as Code tools
• Experience with Temporal or Pub/Sub
• Experience migrating a legacy system step by step

What we offer

• A gross annual salary of up to €90k, plus a strong benefits package
• Work with ambitious, driven people in a high-energy scale-up
• Plenty of growth opportunities: as the company scales, new roles and responsibilities open up constantly
• Flexibility to work from home, with 2 to 3 days a week in the Utrecht office to learn and collaborate together

Interested? Please apply directly via LinkedIn.