Senior Full Stack Engineer
– Build, Scale, and Shape the Future of Predictive AI –

At Neurons, we’re revolutionizing how brands understand and engage with people. By combining state-of-the-art AI with deep neuroscience insights, we enable companies to predict consumer responses in seconds, transforming marketing into something truly predictive and actionable.

We’re looking for a Senior Full Stack Engineer to help us push this mission forward. This isn’t a role about ticking boxes; it’s about building systems that scale, shipping products that deliver impact, and raising the engineering bar as we grow. You’ll be part of our newly established API and Integrations team, whose goal is to enable customers to interact more seamlessly with the Neurons platform; whether through their own custom integrations or ready-made solutions with major partners in the marketing and advertising space.

If you’re passionate about designing great technology and seeing it make a difference in the real world, you’ll thrive here.

What You'll Be Driving

Design & Scale the Core Platform
You’ll architect and build the backend services and APIs that power our predictive insights; ensuring they are fast, secure, and highly scalable. Your work will enable our platform to process increasing data volumes and deliver real-time results as we grow.

What helps you succeed: Deep experience with Python (ideally Django or FastAPI), designing distributed systems, and implementing asynchronous processing or microservices.

Deliver Features That Matter - Fast
You’ll work closely with product and design to translate ambitious ideas into working software; building everything from backend logic to frontend interfaces. Your ability to deliver end-to-end functionality will allow us to release new capabilities quickly and confidently.

What helps you succeed: Strong skills in React and TypeScript, plus experience delivering full-stack features from concept to deployment.

Ensure Reliability, Quality, and Clean Code
You’ll drive engineering excellence through clean, maintainable code, robust testing practices, and thoughtful architecture. Every release you ship should strengthen the platform and make it easier to evolve over time.

What helps you succeed: A track record of building reliable systems with strong testing strategies (unit, integration, end-to-end), and familiarity with principles like SOLID, TDD, or BDD.

Shape Product Direction With Your Expertise
As a senior engineer, you’ll collaborate closely with cross-functional teams to shape technical decisions and influence the product roadmap. You’ll balance ideal architecture with practical business needs; always aiming to deliver maximum impact.

What helps you succeed: Experience contributing to product planning, making architectural decisions (ADRs/RFCs), and aligning technical work with business goals.

Mentor and Multiply Your Impact
You’ll help build a strong, collaborative engineering culture; mentoring junior developers, leading by example in code reviews, and sharing best practices.

What helps you succeed: Comfort leading technical discussions, guiding peers, and raising the bar for engineering quality.

What Success Looks Like

Our APIs and data pipelines scale smoothly to meet growing demand.
New product features are shipped rapidly and integrate seamlessly across the stack.
Codebases become cleaner, more maintainable, and easier to extend.
Engineering choices directly shape and accelerate the product roadmap.
Your technical leadership makes the entire team stronger and more effective.

The Experience That Helps You Succeed

While there’s no single “perfect” background, we think the ideal candidate will bring most of the following:

~5+ years of professional experience building and scaling web applications.
Proven expertise with Python (Django or FastAPI) and designing production-ready APIs.
Strong skills with TypeScript, React, and modern frontend architecture (React Query experience is a plus).
Hands-on experience with distributed systems, asynchronous programming, and message queues.
A history of delivering robust testing strategies and maintaining production-grade codebases.
Strong communication skills and a collaborative mindset. You thrive in cross-functional, Agile teams.

Shape What's Next With Us

Work on technology that merges AI, neuroscience, and marketing - solving problems no one else is tackling.
Tackle complex engineering challenges with a team that values creativity, collaboration, and craftsmanship.
See your work deliver measurable impact for some of the world’s biggest brands.

Location: This role is based at our headquarters in the Greater Copenhagen Area. (We’re unable to support fully remote work for this position.)