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Startup Tech Co-Founders

We Build YourTech Foundation

Two technical co-founders acting as your complete IT department.

4+
Active Projects
2
Co-Founders
100%
Dedicated
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Our Approach

The Co-Founder IT Model

We don't just build software—we become your technical partners. As your dedicated CTO/CIO team, we own every aspect of your technology so you can focus on growing your business.

How It Works

1

You Focus on Business

Handle idea development, compliance, marketing, and sales

2

We Handle Tech

Development, infrastructure, design, and technical leadership

3

Together We Grow

Scale your product with a fully aligned technical team

Full Stack Ownership

From database architecture to pixel-perfect UIs—we handle the complete technical stack.

True Partnership

We're not just contractors. We're invested co-founders who care about your success.

Modern Technology

We stay at the cutting edge with Next.js, FastAPI, Azure, and AI integrations.

Production Quality

Enterprise-grade code, security best practices, and scalable architectures from day one.

Rapid Iteration

Move fast without breaking things. We deliver MVPs quickly and iterate based on real feedback.

Long-term Vision

We build for the future, not just the now. Maintainable, scalable, and extensible solutions.

The Team

Meet Your Tech Partners

Two specialists with complementary skills, covering the entire spectrum of modern software development.

DH

David James Hammer

UI/UX, Design & Frontend

Passionate about creating intuitive, beautiful interfaces that users love. Specializing in Next.js, Shadcn UI, Zustand and E2E Testing.

UI/UX DesignNext.jsTypeScriptTailwind CSSPhotoshopFigma
JL

Jacob Marup-Lorentzen

Backend, Database & Infrastructure

Expert in building robust, scalable systems that power modern applications. From APIs to cloud infrastructure, handling it all.

PythonNode.jsSupabaseAzureDockerKubernetes
Our Work

Featured Cases

Real products we've built for ambitious startups. Each one reflects our commitment to quality and innovation.

P

Pensu

AI-Powered Education Platform (LMS)

An intelligent tutoring platform for the Danish school system, featuring AI-driven personalized learning and RAG-based content delivery.

Next.jsFastAPIAzure OpenAIRagie.ai
B

B2Byg

Contractor Work Exchange

A complete B2B platform connecting contractors and subcontractors with the help of an AI-driven chatbot and semantic matching.

Next.jsSupabaseOpenAIFastAPIpgvector
S

Sayhello

Analog and Digital Greeting Cards

A greeting card product that allows you to attach a personal video greeting to a physical card or gift using a unique QR code.

Angular 19SCSSFirebaseLottie
R

Rappit

Sales Intelligence Platform

An AI-powered sales intelligence platform that turns email conversations into structured projects, actionable insights, and ready-to-send professional offers.

ReactFastAPISupabaseRAG

And More...

Interested in working with us? Let's talk.

What We Do

End-to-End Expertise

Everything you need to build and scale your product, covered by our complementary skill sets.

UI/UX Design

User-centered design that converts. From wireframes to high-fidelity prototypes, creating interfaces that users love.

David

Frontend Development

Pixel-perfect React and Next.js applications with modern animations, responsive layouts, and optimal performance.

David

Backend Development

Scalable APIs and microservices built with Python, Node.js, and best practices for maintainability.

Jacob

Database Architecture

Optimized data models, PostgreSQL expertise, and efficient query design for any scale.

Jacob

Infrastructure & DevOps

AWS, Docker, Kubernetes, and CI/CD pipelines. Production-ready deployments with monitoring and security.

Jacob

Technical Leadership

Strategic technology decisions, team mentoring, and architectural guidance to set your startup up for success.

David & Jacob
Get In Touch

Ready to Build Something Amazing?

Whether you're starting from scratch or need to level up your existing tech, we're here to help. Let's discuss how we can become your technical partners.

Send Us an Email

The best way to start a conversation

hello@hammerlorentzen.dk
Available for new projects
Based in Denmark