Drawing from experience across modern web technologies, cloud platforms, and system architecture, I build end-to-end solutions that create lasting value. My passion for learning and natural curiosity drive me to stay at the forefront of technological innovation.
Testimonials
Don't just take my word for it — hear from colleagues and clients I've worked with.
We have been working with Jannik Wempe in the area of our website programming for many years. He has extensive expertise in this field and is always very solution-oriented. He always keeps his appointment commitments, and he responds very quickly to spontaneous inquiries and change requests. I enjoy working with Jannik - it's fun, and the result of his work exceeds our expectations.
Managing Director at easy data solution GmbH
Jannik is one of the smartest engineers I’ve worked with. He deeply understands problems, asks the right questions, and delivers high quality solutions quickly — exactly what a fast-moving startup needs. He’s an invaluable asset to any team.
Co-founder & CTO at Hashnode
We have been working with Jannik for several years. He developed our website and maintains and updates it as needed. In addition to his expertise, he is a good listener, can put himself in the customer's shoes and therefore comes up with quick and adequate solutions or adjustments. A man's a man's a word, a word, that sums up Jannik Wempe perfectly. You are in professional and trusted hands.
Co-founder at ESP Science & Education OG
Portfolio
A selection of products and client work I've built with commercial intent.View my CV for the broader track record.
Platform with various AI tools to support editors in their day-to-day work for an anonymous media client.
Consulting, design and development of a webapp that represents the company and allows to book courses.
Development of a landing page with focus on performance and SEO.
Shopify app to help merchants fight fraud and chargebacks. You can create custom rules to detect fraud and block orders automatically.
Headless Shopify shop using Shopify Hydrogen for a store selling handmade products.
Development of a PWA that allows newcomers to Rixdorf to get to know the neighborhood using a gamified approach.
Subscriber analytics for the newsletter platform Kit (former ConvertKit). Understand your audience and grow your business.
Design and development of a WooCommerce shop selling clothes for kids and babies with special needs.
Shopify app to help merchants combining multiple orders into a single one to save on shipping costs.
Analytics solution for GitHub actions. Understand which actions and repositories are most expensive. Exited because lack of time to maintain it.
Shopify app that allows merchants to easily generate SEO metadata using an LLM for products by specifying desired keyword.
My personal website that you are looking at right now.
Blog
Thoughts on software engineering, cloud architecture, and building products.
A growing share of your potential readers ask ChatGPT instead of Google. Here's what actually makes a blog visible in AI answers – separated into verified findings, plausible advice, and refuted myths.
2025 was the year I took the leap from employee to self-employed. Here's how my first year of freelancing and building products went.
When I first encountered snapshot tests, I was skeptical. The concept seemed strange, and their benefits weren't immediately obvious. But after experiencing their value firsthand, I've become a convert – and here's why I think you should give them a ...
What happens to existing customers if you change or delete a pricing plan of your Shopify app?
Speaking
Sharing knowledge through conferences and podcast appearances.
