Reliable, efficient, and scalable results. Highly recommended!
-Dan Sveen, Roof History
Client Feedback:
"Exceptional freelance services! Jens is a Very skilled and quick developer, with impressive learning and adaptability. They consistently offered valuable suggestions that benefited our projects. Strong understanding of modern standards and seamless collaboration. Their cheerful, proactive, and smart approach made working together easy and enjoyable. Highly recommended!"
Harri Vaelilae
OnePointCode
"I recently hired Jens to develop the backend of my website, and I couldn’t be happier with the strong, efficient, and scalable results. Communication was seamless, they provided valuable insights, and I highly recommend their high-quality backend services."
Dan Sveen
Roof History
"Working with Jens was a great experience – they were detail-oriented, proactive in solving challenges, and ensured smooth communication throughout. Their dedication made the whole project seamless and enjoyable."
Hannu Valve
Hexer Network
"Jens is a really competent developer. He‘s got a lot of experience in making beautiful websites or UIs. Communication was never a problem he always responded as quickly as possible (sometimes he‘s a bit busy). I will definitly come back for any to-be-established website projects. I can highly recommend."
Livio von Planta
EduCollect
Projects:
LokotaAI
Founder & fullstack-developer
A fully featured AI-powered chatbot widget that businesses can integrate into their websites to serve customers by answering various queries.
Core features:
- Powerful RAG-based architecture
- Automatic webscraping for context gathering
- Reinforcement learning for better responses
- Enterprice level abuse detection and prevention
- Widget customization with own color theme
Achievements:
- Reduced operational costs by 70% through efficient RAG-architecture over traditional LLM approaches
- Gained +500 visitors in 24h after launch
- Added caching to common queries to reduce latency and improve performance
- Developed a universally embeddable script compatible with any modern web framework, utilizing smart CDN hosting for optimized page load times
Tools used:
Next.js
Tailwind CSS
TypeScript
Vite
AWS
Docker
OpenAI
DeepSeek
Langchain
RAG
Pincone
Redis
BullMQ
MongoDB
CI/CD
Eskimovillage
Lead Frontend-developer
A comprehensive application for a self-help learning portal website with blog lessons, video lectures combined with a respectful, encouraging and strongly connected community.
Core features:
- Powerful realtime chat feature
- CMS for SEO blog pages
- Integrated Jitsi meet
- Complex admin dashboard
- Calendar scheduling
Achievements:
- Migrated a real-time chat to a more stable and scalable solution, cutting latency, downtime and boosting performance by 10x.
- Increased visibility by 90% with enhanced SEO
- Improved page speed with smart caching and image optimization
Tools used:
Next.js
Tailwind CSS
TypeScript
NestJS
Docker
MongoDB
Cloudflare
Jitsi
Matrix-js-sdk
Hey 👋
I'm Jens-Mikael Stjernberg, an 18-year-old young entrepreneur from Finland. I've been programming for four years already, and although I'm still in high school, I passionately build professional-level web projects. I founded Stjernberg Web and IT Services in fall 2024, when traditional summer jobs no longer inspired me and I wanted to take on new challenges as an entrepreneur in the world of software. Since then, I’ve completed numerous IT projects globally – not only in Finland, but also in the United States and Germany. Music and sports have always been important to me. When I’m not coding, I play the guitar or piano, or I hit the gym hard enough to make walking difficult the next day. I come from a multilingual entrepreneurial family from Norway. At home, we speak three languages: Finnish, Swedish, and Norwegian. In addition, I speak fluent English and have studied German in school for five years. So, if you're looking for passionate and multilingual IT help, don’t hesitate to get in touch – let’s make your vision a reality!
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