AI-Powered Fintech Full-Stack Engineer

FLEX FUNDING A/S; København; On-site; DKK 700,000 - 900,000; Full time

Job summary

Flex Funding is a Scandinavian crowdlending platform helping SMEs access flexible financing across Denmark and Norway, backed by 4,000+ investors. We are expanding into Sweden and building new financing products — while evolving how we design, build, and scale our platform.

We are looking for a strong full stack engineer with solid foundations and an appetite to amplify their skills with AI. You will work with one other full stack developer, owning technical decisions and raising the bar for

Qualifications

• Solid full stack fundamentals and ability to justify technical choices.
• Experience applying AI tools within development workflow.
• Ability to review code, including AI-generated code, to high standards.
• Ownership mindset beyond implementation and maintainability.
• Comfort across frontend, backend, databases, and integrations.
• Proactive, asks questions or moves forward without perfect specs.
• Willingness to learn unfamiliar parts of the platform.
• Clear communication with technical and non-technical colleagues; in-person collaboration.

Responsibilities

• Build end-to-end solutions from idea to production-ready systems.
• Modernise monolithic platform for better structure and features.
• Apply AI across development, testing, documentation, and refactoring.
• Own reliability, security, performance, and maintainability.
• Work with financial workflows, data, and external integrations.
• Collaborate closely with product, business, compliance, and partners.

Skills

Full stack

AI usage

Ownership

Communication

Problem solving

Team collaboration

Tools

C#

.NET

TypeScript

Vue/Nuxt

Job description

Flex Funding is a Scandinavian crowdlending platform helping SMEs access flexible financing across Denmark and Norway, backed by 4,000+ investors. We are expanding into Sweden and building new financing products — while evolving how we design, build, and scale our platform.

We are looking for a strong full stack engineer with solid foundations and an appetite to amplify their skills with AI. You will work with one other full stack developer, owning technical decisions and raising the bar for