Websites and landing pages
For offers, products, and companies that need a professional presence and stronger online visibility.
Company websiteProduct or offer page
Custom software development
Websites, apps, and software that move your project forward.
I build websites, web apps, and custom software for companies and independent professionals.
01
You need a professional web presence that positions your offer clearly.
02
An idea should become an app, platform, or custom software product.
03
An existing process or system should become more modern, faster, or more reliable.
How I help
Implementation for digital products, not just isolated pieces.
Web apps and custom software
When standard software does not fit, I build applications around your product, workflow, or business model.
Customer portalsSaaS products
Mobile apps
I build iOS and Android apps, from internal applications to products your customers use every day.
iOS and AndroidOffline features
Automation and integrations
Repeated work, data flows, and system handoffs can often be reduced significantly when processes are connected cleanly.
InterfacesEmail and data workflows
Backend, infrastructure, and operation
For software to run reliably, I also handle server logic, databases, APIs, deployment, and monitoring.
APIs and databasesCloud and deployment
Projects
Projects where unclear workflows became usable products.
Own Product · Solo Developer
Agent Loadout
Email inboxes, credential vaults, and Linux machines for AI agents. Teams decide what each agent can access and keep its resources when they switch clients.
Outcome
Switch clients without losing the agent’s inbox, credentials, or history
Own Product · Solo Developer
Passcard
A desktop app that reads coding-agent logs and shows token usage, estimated costs, and budgets by person and project in a shared dashboard.
Outcome
See which projects and clients account for recorded usage and estimated costs
Mobile App Developer
T IT AN GmbH
Mobile app that automates construction inspection documentation from photo capture to instant report delivery.
Outcome
Reduces office rework after construction inspections by generating protocols on site
Full-Stack Developer · Product Development
HeinzerIT Cockpit
Multi-tenant operations and customer portal that brings customers, contracts, invoices, devices, reports, and integrations into one cockpit.
Outcome
Combines operational customer work and customer self-service in one permission-aware platform
Full-Stack Developer
Globalrun
E-commerce platform with inventory management and POS system.
Outcome
Connects the online store, point of sale, and inventory in one continuous system
Own Product · Solo Developer
AgentPlan
A secure publishing service that turns plans, reports, and dashboards created by AI agents into stable, versioned links.
Outcome
Turns temporary AI-generated files into durable, versioned links that can be shared securely
Collaboration
Strategic thinking, pragmatic building.
01
Clarify the goal
We define what outcome the software should create and how success will be measured.
02
Design the solution
You get a clear recommendation for scope, user experience, technology, order, and effort.
03
Build for production
I develop, test, and hand over the solution so it can be extended and operated.
From the blog
Engineering notes from ongoing development.
10 min read
Ox Alpha is probably GLM-5.3: provider attribution, capability tests and agent-security findings
A black-box assessment of Ox Alpha: the visible answer refuses, but raw reasoning and tool arguments reproduce protected context — and the suppression parameters do not stop it.
Read post6 min read
How beisammen plays end-to-end encrypted video
A local HTTP proxy connects encrypted chunks to AVPlayer and ExoPlayer.
Read postFrom idea to operation