Contract development
Infrastructure-related applications, platforms, interfaces, and integrations – from backend development to production rollout.
Technical projects between software and infrastructure.
I support companies as a developer, cloud architect, CTO, or technical point of contact – with a focus on infrastructure, VPN and industrial connectivity, IoT/OT, AI integration in software, knowledge bases, and local RAG systems.
Work together
Alongside my company roles, I take part in selected projects – for a defined task, over a longer phase, or with ongoing technical responsibility.
Cloud and infrastructure architecture
Architecture, migration, and automation of server, cloud, and network infrastructure, including operations and monitoring.
CTO and technical leadership
Technical decisions, architecture, roadmaps, and coordination across software development, infrastructure, and external partners.
Technical point of contact
Ongoing responsibility for complex systems and a direct technical interface for management, teams, and service providers.
Companies and responsibilities
My current roles in company leadership, product development, and technical operations.
01 · Managing Director
CareXOT develops connected room assistance for residential care and geriatric settings. Its platform combines indications of possible falls, bed exits, and presence in a shared operational view. Robin Zins and I are the company's Managing Directors.
02 · Managing Director
WZ-IT develops and operates business-critical software, cloud and network infrastructure, and open-source systems for companies.
03 · Founder
merkaio develops and operates IoT and edge infrastructure, from LoRaWAN and MQTT to gateways, device management, and platforms for distributed sites.
Selected systems and projects
Examples of platforms, site infrastructure, secure remote access, and AI-powered knowledge systems.
nextGYM GmbH
Germany
Multi-location management and deployment automation for unmanned gyms
A central platform for managing and provisioning local infrastructure. New sites are prepared with networking, VPN, SSO, and IoT connectivity.
Result
The technical setup of a new site was reduced from several hours to a few minutes.
Provisioning · VPN · SSO · IoT
ABCO Water Ltd.
Australia
Remote-access and HMI platform for distributed water treatment systems
A platform for managing and controlling remote access to HMI and PLC-related systems across distributed industrial sites.
Result
One central access layer combines plant visibility, role-based permissions, and traceable access.
HMI · OT · WireGuard · Remote Access
EVA Real Estate LLC
United Arab Emirates
Cloud migration to sovereign European infrastructure
Migration of an existing AWS environment to European infrastructure using Proxmox and a setup designed for long-term operations.
Result
81 percent cost reduction from USD 1,300 to USD 250 per month, full data sovereignty, and ROI after 4 months.
Hetzner · Proxmox · Migration · Operations
Local AI infrastructure
Project context (anonymized)
Local AI and RAG platform for sensitive company data
A local AI environment with a knowledge base, document pipelines, access control, and connections to internal data sources.
Result
Internal documents and knowledge can be searched through controlled access and used in assistant features.
Local LLMs · RAG · Knowledge Base · Integrations
Focus areas
I focus on systems in which software connects directly to infrastructure, networks, devices, data sources, and ongoing operations.
AI integration and knowledge systems
AI features in existing software · RAG systems · knowledge bases · APIs and interfaces · documents, data, and knowledge sources · access control · local LLMs
Infrastructure-related software
platforms and portals · provisioning · device and site management · APIs · roles and permissions · integrations
Infrastructure, VPN, and industrial connectivity
site networking · WireGuard · NetBird · routing · network segmentation · cloud and on-premises · SSO · monitoring
IoT and OT systems
IoT platforms · LoRaWAN · MQTT · gateways · sensors · edge systems · HMI and PLC integration · remote access
Operations and security
Proxmox · Docker · automation · CI/CD · monitoring and alerting · backups · audit logs · disaster recovery
About me
I am Timo Wevelsiep. As Managing Director of CareXOT GmbH and WZ-IT and founder of merkaio, I work on products of my own as well as technical systems for other companies.
My focus is infrastructure-related software, network and server infrastructure, VPN and industrial connectivity, IoT and OT systems, and integrating AI into existing software.
This includes RAG systems, knowledge bases, local AI, and connecting different APIs, documents, and data sources.
I work with these systems from architecture and development through rollout and ongoing operations.
Insights
All postsAI & Automation
Vibe Coding in Production: AI-Generated Code, EU Sovereignty, and the Stack That Actually Holds
Vibe coding with Cursor, Claude Code, v0 or Bolt ships MVPs in hours - but 50% of AI-generated code has security flaws. The practical pillar guide: review, patches, CI/CD, and the EU-sovereign stack reframe.
Strategy
What is a Fractional CTO? Responsibilities, costs, and when it pays off
A Fractional CTO is an external Chief Technology Officer on a part-time basis. Responsibilities, costs, comparison to Interim CTO, and when the model is actually worth it.
Contact
For development projects, technical responsibility, or architecture involving infrastructure, IoT/OT, and AI systems, contact me by call, email, or LinkedIn.