Senior Full-stack Developer

We're hiring a Senior Full-Stack Developer to join our team in Aarhus

Build the platform that brings AI agents to ecommerce teams

We're looking for an experienced full-stack developer who can bridge the gap between powerful backend capabilities and intuitive user experiences. This isn't about churning out features - you'll be architecting and building the platform that enables ecommerce teams to harness AI agents, manage massive datasets, and gain transparent insights into their operations.

You'll work on challenging problems: real-time data tables handling 100k+ records, complex state management, seamless backend integrations, and interfaces that make advanced AI capabilities accessible to non-technical users. This is a role for someone who thinks in systems, moves fast, and wants to shape both technical direction and user experience.

Join us on our growth journey

At Cernel, we're bringing the AI revolution to ecommerce by building the intelligent backbone behind every item sold online. We make ecommerce teams work smarter, faster, and with amplified abilities across the entire value chain - starting with what lies at the core: product data.

We design and develop a platform in-house that provides our customers with advanced AI capabilities on top of their existing data, allowing them to operationalize tasks and gain transparent insights into how their data is stored, enriched, and analyzed. We facilitate data management and actionable insights at scale across all their systems.

As Senior Full-Stack Developer, you'll work closely with our CTO, taking shared responsibility for technical decisions, architecture, and delivering solutions that our customers depend on daily.

Responsibilities and daily work

Full-stack platform development

• Build end-to-end features that bring AI capabilities to end-users

• Develop performant, filterable data tables handling 100k+ product records with real-time updates

• Create intuitive interfaces for complex data management and AI operations

• Integrate backend services seamlessly into frontend experiences

Platform infrastructure

• Develop core platform services (APIs, OAuth, billing services)

• Build and maintain component libraries that scale across the application

• Design and implement scalable backend services

• Ensure data flows efficiently between frontend, backend, and AI systems

Code quality and technical excellence

• Write end-to-end tests and champion testable design patterns

• Improve code quality through well-architected, maintainable solutions

• Define best practices for full-stack development

• Balance technical debt with feature velocity

Cross-functional collaboration

• Work closely with product team on user experience decisions

• Collaborate with backend and AI teams on integration requirements

• Support product team in scoping and estimating technical work

• Help define and evolve our technology stack

Technologies you'll work with

You'll work with modern, production-grade technologies while helping shape our future stack:

Frontend:

• TypeScript and React for application development

• Modern state management and data fetching patterns

• Component libraries and design systems

Backend:

• Golang and Python for API development

• SQL and NoSQL databases for data management

• Event-driven architecture for real-time updates

• Google Cloud Platform for infrastructure

Full-stack:

• API design and integration patterns

• Performance optimization for large datasets

• Real-time data synchronization

Who you are and requirements

You have:

• 5+ years of professional full-stack development experience

• Ability to work onsite in Aarhus (remote not accepted)

• Deep expertise in development across both frontend and backend

• Strong React/Next.js skills with proven ability to build complex UIs

• Solid backend API experience (Golang/Python)

• Track record of building component libraries and scalable services

• Experience shipping full-stack features that handle large datasets efficiently

• Comfort working across the entire application stack

Who we are

Cernel is building the next generation of ecommerce infrastructure with AI-powered agents that automate complex tasks and connect workflows across systems. We're developing an advanced agent framework that analyses data, makes decisions, and drives performance - giving ecommerce teams better results, higher conversions, and more time for creative work.

We are currently a team of 17 people working from our brand new HQ at Frederiksbjerg, Aarhus. We are ambitious, caring, and collaborative. We work hard, move fast, and genuinely care about building both a great product and a great organisation.

Next steps and how to apply

The process for the role will look as follows:

• Apply and share information about yourself

• Complete personality assessment

• 60 minutes onsite interview w/ CTO and Chief of Staff

• 80 minutes technical interview w/ CTO

• Meet the team and culture fit conversation

Start date: As soon as possible