Full-Stack Web Developer
Web Apps, SaaS & AI Solutions
Co-founder & CPO of the Stoicera Software Group. I own software end-to-end — from the first architecture sketch to production operations.
available for projects
since 202350+ projects20+ clientsPerg / Linz, AT
~/profil
Software engineer (HTL Perg, computer science), born 2005. In 2023 Raphael Lugmayr and I founded the Stoicera Software Group — since then we have delivered more than 50 projects for over 20 clients: web applications, SaaS products and AI solutions running in production.
I work end-to-end: concept, architecture, development, deployment, operations. For me, responsibility doesn't end at the code — that's where it starts.
My foundation is my Catholic faith. It shapes how I work: honest, reliable, true to my word — and grateful for abilities that are given, not earned.
„Unless the Lord builds the house, those who build it labor in vain.“
profile.txt
~/stack $ cat stack.toml
Deliberately curated instead of arbitrarily long: every technology here runs in real client projects — and I know it all the way into operations.
[web & frontend]
[backend & data]
[ai engineering]
[cloud & operations]
~/projekte $ ls
A selection of projects I conceived, built and operate as co-founder of the Stoicera Software Group — all running in production unless noted otherwise.
current focus
Digital school meals · Multi-tenant SaaS
Web application for ordering, managing and billing school lunches. Started as my HTL diploma thesis, today an active product with contracted customers: the towns of Gallneukirchen and Tulln, and Petrinum Linz.
Co-founder & CPO
Critical data infrastructure · R&D
Infrastructure layer that transforms smart-meter data from 120+ Austrian grid operators into validated, billing-ready records — with a mandatory quality gate before every settlement. Born out of Austria's ElWG 2026 energy act.
Independent engineering project (not public)
Homepage & community PWA
Homepage and members platform (PWA) with authentication and real-time data for a growing international Catholic community. Localized DE/EN.
Co-founder
NGO platform with CMS
Bilingual platform (DE/EN) with editorial content management for an international NGO — including Google Workspace, business email and SEO.
Concept, development & operations
Publishing platform
Publishing platform with a Git-based Markdown CMS and a fully automated publishing workflow — from draft to release without manual deployment steps.
Development & operations
Website for an energy community
Website with blog and forms for a renewable-energy community — complemented by an interview series with more than ten chairpeople of Austrian energy communities.
Implementation & ongoing support
~/unternehmen
Behind the Stoicera Software Group are Raphael Lugmayr and me. Two clearly separated brands carry two clearly separated promises — so every client knows exactly what they get.
stoicera.com
Product & web engineering
SaaS products, complex web applications, applied AI and European cloud infrastructure — built with a deliberately modern, curated technology stack.
lugmayrkern.at
The local IT service partner
Fixed-scope contracts, modernization and cloud migration in Austria's two strongest enterprise stacks — C#/.NET & Azure and Java & Spring Boot — plus IT services for private clients.
My role in the group: co-founder & CPO — product engineering, project management, sales & customer support.
Your contact for tenders, fixed-scope contracts & projects. sebastian.kern@stoicera.com
~/ueberzeugung
I am a convinced Catholic — and convinced that the world needs men who carry responsibility: men who create, protect, serve and love.
create · protect · serve · love
I wrote a six-part article series about exactly this, and it's why Raphael and I founded Sword & Seed — a Catholic community for men walking this road together.
~/ressourcen $ cat bookmarks.md
People, books and tools that shape me — a curated bookmark collection, not an ad list.
[people I learn from]
Ruby on Rails, 37signals, Omarchy. Straight talk and craftsmanship.
Austrian software legend and passionate teacher.
One of my favorite HTL professors — mobile computing.
[faith]
The foundation — official and in full text.
The new encyclical on AI and human dignity.
Where I buy my Bibles. I'm currently rebuilding their shop with Medusa and Next.js.
My favorite saint — simplicity, joy, reverence for creation.
[tools & services]
My favorite hosting provider — European, honest, fast.
Self-hosted PaaS — simply genius.
…and the second genius open-source PaaS.
Your own cloud instead of Big Tech — I love it.
Underrated software suite for small businesses.
[hardware & setup]
Dream laptop no. 1 — modular and repairable. Sponsoring welcome ;)
Dream laptop no. 2 — sponsoring welcome here too.
My Linux setup — Arch + Hyprland, by DHH.
My second Linux daily driver.
Plus the Apple ecosystem.
~/danke $ cat DANKE.md
None of this I built alone. My thanks go first to God — He gives the abilities, the strength and the people. This page, like everything I build, is to His glory. And He placed people at my side without whom none of it would exist:
Raphael Lugmayr ↗Co-founder, brother in faith, closest companion on the road. Started together, followed through together.
You took responsibility when it counted — and showed me what it means to be a man.
For your love. And for providing for my sister and me — even through dark times.
You gave me the love and the hope I always needed. See you soon.
For providing, caring, loving — through all the years.
My brothers and sisters in faith: you carry me.
~/kontakt
Tender, project or cooperation: write to me — I answer personally.
sebastian.kern@stoicera.com
or directly via:
Documents:
Perg / Linz, Austria
Or ask the terminal.
visitor@kernsebastian: ~
This page is the output of `whoami`. Here you can ask yourself.
Type help for all commands — a few are undocumented.