Headless & API-first web
Fast, SEO/GEO-strong frontends on decoupled architectures — from React/Next and Astro to SAP Commerce Cloud. Server-first, not client SPA.
Leaster · IT engineering
Software, cloud and automation that holds up.
From architecture to operations: headless web, identity & zero trust, AI-driven automation. This page is the proof itself — server-rendered, accessible, machine-readable.
- 0 KB JS by default
- Native light/dark mode
- Structured data & llms.txt
- AI-native · no vibe coding
Capabilities
Five pillars, real projects behind each.
Not a buzzword list — every pillar stands on shipped software.
Cloud, identity & zero trust
Azure landscapes, EntraID / Azure AD B2C, ringfencing and zero-trust architecture — including governance of entire provider landscapes in enterprise environments.
Automation & AI integration
Python ETL, data sync and pipelines that kill routine work — including LLM integration in production (Claude Code) long before “GenAI” went mainstream.
DevSecOps & self-hosting
Git-based deployment pipelines, container orchestration and reverse proxies on owned infrastructure — from Portainer and Plesk through Nginx Proxy Manager to security scans, DNS and domains. All the invisible operations.
Cross-platform & mobile
Native and cross-platform apps from one source: Android, iOS, desktop — with offline sync and clean integration to your own API.
Work
Selected projects.
Substance over names. Where projects are confidential, the solutions speak for themselves.
diebema.de — IT operations & headless relaunch
Full responsibility for the IT of a financial and real-estate advisory firm — including an ongoing website relaunch from WordPress to a headless Next.js/TypeScript architecture.
Digital platform for a nationwide community
A CMS core extended with a self-built Python/REST ecosystem: native + cross-platform apps, automated newsletter and social posting, AI-driven extraction of event data straight into a ticketing system, geodata enrichment and lifecycle automation.
Multi-tenant headless SaaS
A multi-tenant SaaS platform on React + Python, containerized and API-first — from the database to live operations. Named reference to follow at launch.
Identity & web tools in a corporate environment
Internal applications behind single sign-on: Azure AD B2C integrations, claims and SAML configuration, and production web tools. Not publicly accessible — shown as capability, not a showcase.
mtg_benchmark
A public Python project — a piece of work you can read in the source.
Tools
Small playthings, fully in the browser.
Self-built mini tools — free, no tracking, no sign-up. Live now.
Approach
Principles, not buzzwords.
Leaster delivers engineering substance over slides: architecture, build and operations from one source — web, cloud, identity, automation.
Server-first, API-first, security-first. Whatever can be automated gets automated; whatever needs protecting lives behind zero-trust principles.
This site is built with Claude Code — AI-native, but no vibe coding: clear rules, clean architecture, documented decisions and zero-trust discipline. That’s how good software gets made in 2026. The proof is the execution itself.
Contact
Get in touch.
This site is a digital presence — not a business, just a place where the work speaks for itself. Say hi on LinkedIn.