Next.js & Headless CMS Freelancer in Duisburg

Next.js Freelancer Duisburg: Your website is burning money and wasting its potential. Let's change that.

Profilbild
Successful projects with
Continuum
Objego
eco.income
Abo Store

Who am I?

I'm Nils – Senior Fullstack Developer focused on SaaS products, content platforms, and high-performance websites. I've guided SaaS products from the first line of code to paying customers, and supported enterprise teams in scaling their content platforms. My standard: code that's not just clean – but that drives the business forward.

  • 10+ years of fullstack web development
  • Project experience from US startups to German enterprises
  • Deep technical expertise with a focus on product and business goals
Profilbild
I'm flexible with technology, but especially enjoy working with:
Typescript
PostgreSQL
Prisma
TanStack Query
TailwindCSS
Shadcn UI
Docker
Kubernetes
Vercel
Git
Sentry

Successful Projects

Continuum

Continuum

Full-Stack Development

Herausforderung

  • Further development of a SaaS solution with Next.js and Firebase
  • Support with planning new features and advancing the product roadmap

Ergebnisse

  • ~60% improvement in load times through implementing a frontend caching strategy and optimising training plan generation algorithms
  • Introduction of unit tests with >80% test coverage on new code
  • Improved development velocity through refactoring and code optimisation

Tech Stack

Typescript
TailwindCSS
TanStack Query
Shadcn UI
Firebase Functions
Firestore
Sentry
Objego

Objego

Front-End Development

Herausforderung

  • Further development of an existing SaaS product, implementing new features within a Scrum team
  • Regular training and onboarding of new team members
  • Advancing the application architecture in collaboration with other lead developers

Ergebnisse

  • Reduction of build and test times by up to 80% by converting a monolithic Angular application into monorepos and micro frontends
  • Successful Angular version upgrades from v15 to v18, including refactoring and adoption of new Angular features

Tech Stack

Typescript
Docker
Sentry
eco.income

eco.income

Full-Stack Development

Herausforderung

  • Full-stack development of a SaaS product including software architecture and data model
  • Close collaboration with the founder for continuous product validation

Ergebnisse

  • Built a SaaS product from scratch through to launch including customer onboarding
  • Long-term operation of the platform with high availability

Tech Stack

Typescript
TailwindCSS
Docker
Google Cloud
PostgreSQL
Sentry
Abo Store

Abo Store

Full-Stack Development

Herausforderung

  • Ideation, feature conception, and implementation of the complete business idea
  • Building and operating an SEO-optimised web platform
  • Technical implementation of all frontend and backend development

Ergebnisse

  • Scaled to over 10,000 monthly visitors through organic traffic
  • Top-3 ranking in Google search for over 100 relevant keywords through targeted SEO optimisation
  • 1st place at the startup competition "Leitidee" in Bochum (2022)

Tech Stack

Typescript
TailwindCSS
Shadcn UI
Firebase Functions
Docker

Your project?

Get in touch

I support you from idea to launch – and beyond

Discovery & Planning

We discuss your project and figure out exactly how I can support you. If everything fits, we create a detailed roadmap. We define and prioritise the most important features before development begins.

Development & Testing

During development I implement the agreed features by priority. I focus on clean code, regular updates, and thorough testing to ensure quality. You receive regular updates and feedback rounds to make sure we stay on track.

Launch & Support

When you're ready to go live, I take care of deployment and long-term operation. We continue to develop further features and improve the product as needed.

Testimonials

There aren’t many true full-stack developers. Fewer still can take on deeply complex problems and genuinely solve them. Nils is both, and more. He brings technical depth, clarity of thought, and a calm, reliable presence to every project. A highly respected and recommended addition to any team. And when he’s not coding, he’s out training for triathlons; a true embodiment of work hard, code hard, play hard. On all fronts, Nils is a machine.

At objego, I worked with Nils in different teams and phases of the company - from greenfield features to legacy migrations. What always impressed me was how quickly he could slot into new setups and immediately start contributing real value. He brings a strong mix of technical depth, calm communication, and the flexibility to adapt to changing requirements. You always felt in good hands when Nils was involved.

Nils war einer der ersten, die unser Produkt technisch mit aufgebaut hat. Mit seiner strukturierten Arbeitsweise, Flexibilität und klaren Kommunikation hat er maßgeblich dazu beigetragen, dass wir schnell vom Konzept zur funktionierenden Lösung kamen. Besonders wertvoll war seine Fähigkeit, Unklarheiten in Anforderung proaktiv und kreativ zu lösen und ein gutes Auge für UI.

Tell me about your project

Here's how it works

A no-obligation conversation about your project

We'll discuss your project and I'll show you how we can tackle it together.

Concept and proposal

I'll create a detailed concept with a clear timeline and a transparent offer.

Fast execution

From concept to working solution with regular updates and clear communication.

Want to talk about your project? Feel free to reach out via the form or:

Frequently Asked Questions