Sound familiar?
One person, no layers. You get senior experience and a working result, not a slide deck. This is usually where it starts.
We found traction. The architecture didn't come along.
Scaling startups
From first traction to serious load. Architecture, priorities and the pragmatic path in between.
Launch day went great, until the site fell over.
High-traffic web
Fast, resilient platforms that stay up when the spike hits: caching, load, performance.
We have all the data. We can't do anything with it.
Big data
Pipelines and storage that turn volume into something you can actually use.
The cloud bill grows faster than revenue.
Infrastructure
Cloud and on-prem done sensibly: reliable, observable, and not more expensive than it needs to be.
The AI demo was great. Production is another story.
AI
Practical AI that ships into your product and processes, beyond the demo.
It's broken, late or stuck, and nobody knows why.
Make-it-work mode
I step in, find the real problem and fix it.
Seen it. Built it. Fixed it.
I'm Denny Jansen. Over 25 years I've worked across many industries, from small teams to large-scale platforms. The tools change, the patterns don't: keep it simple, measure it, and make it work.
jansen.digital is my independent consultancy in Hillegom, the Netherlands. Also written Jansen Digital. Same person, same company.
Scale & performance
- High-traffic websites
- Caching & load
- Performance tuning
- Platform migrations
- System architecture
Data
- Big data
- Data pipelines
- Data modeling
- Real-time & streaming data
- Analytics & reporting
- SQL & NoSQL databases
- Search
AI
- Machine learning
- LLMs & AI integration
- AI in production
Infrastructure
- Linux
- Cloud & on-prem
- Automation & IaC
- CI/CD
- Reliability
- Observability
- Monitoring & alerting
- Cost control
Security
- Security hardening
- Security reviews
- Access & secrets management
- Incident response
Code
- Open source first
- Language-agnostic engineering
- JavaScript frameworks
- Node.js
- React
Leadership
- Lead developer
- System architect
- CTO
- COO
- VP of Engineering
- Technical hiring
Code scales. People have to scale too.
Who to hire first. How to spot the real thing in an interview. How to keep a team fast as it grows.
I also train and coach engineering teams through workshops and master classes.
I've done it as system architect, CTO and VP of Engineering, and I'll do it with you.
Taking on new projects
Got something that needs to scale?
Tell me what you're building and where it hurts. I'll reply personally.
denny [at] jansen.digital- 1
Tell me the problem
A few lines is enough. No form, no pitch deck.
- 2
I reply within a day
Personally, with a first view and a question or two.
- 3
We talk for 30 minutes
Free and without a sales pitch. You decide what happens next.