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AI- and fractional CTO/platform engineer delivering production-grade, multi-tenant systems with a strong focus on security, reliability, and scalable infrastructure across EU and global teams. Experienced across full-stack, DevOps, and applied AI/LLM/vector/RAG integrations. I lead and ship end-to-end: designing architectures, owning technical decisions, automating deployments, and building sustainable platforms for early-stage startups through enterprise-grade delivery—trusted by teams across multiple time zones and domains.…AI- and fractional CTO/platform engineer delivering production-grade, multi-tenant systems with a strong focus on security, reliability, and scalable infrastructure across EU and global teams. Experienced across full-stack, DevOps, and applied AI/LLM/vector/RAG integrations. I lead and ship end-to-end: designing architectures, owning technical decisions, automating deployments, and building sustainable platforms for early-stage startups through enterprise-grade delivery—trusted by teams across multiple time zones and domains.

Frank Mueller

Web Developer, Full Stack Developer, DevOps Developer, +2

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AI- and fractional CTO/platform engineer delivering production-grade, multi-tenant systems with a strong focus on security, reliability, and scalable infrastructure across EU and global teams. Experienced across full-stack, DevOps, and applied AI/LLM/vector/RAG integrations. I lead and ship end-to-end: designing architectures, owning technical decisions, automating deployments, and building sustainable platforms for early-stage startups through enterprise-grade delivery—trusted by teams across multiple time zones and domains.…AI- and fractional CTO/platform engineer delivering production-grade, multi-tenant systems with a strong focus on security, reliability, and scalable infrastructure across EU and global teams. Experienced across full-stack, DevOps, and applied AI/LLM/vector/RAG integrations. I lead and ship end-to-end: designing architectures, owning technical decisions, automating deployments, and building sustainable platforms for early-stage startups through enterprise-grade delivery—trusted by teams across multiple time zones and domains.

Available to hire

AI- and fractional CTO/platform engineer delivering production-grade, multi-tenant systems with a strong focus on security, reliability, and scalable infrastructure across EU and global teams. Experienced across full-stack, DevOps, and applied AI/LLM/vector/RAG integrations.

I lead and ship end-to-end: designing architectures, owning technical decisions, automating deployments, and building sustainable platforms for early-stage startups through enterprise-grade delivery—trusted by teams across multiple time zones and domains.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

German

Fluent

Spanish; Castilian

Fluent

Work Experience

Remote Platform Engineer at Stealth startup / Multi-tenant MRV operating system for the carbon circular bioeconomy

March 1, 2026 - Present

Owns and operates the production stack: Docker Swarm, Traefik v3, PostgreSQL + PostGIS + pgvector, ClickHouse, Redis, with Terraform/Helm and Vault-managed secret rotation across services; enables zero-downtime GitHub Actions deployments. Engineered self-hosted Keycloak OIDC/OAuth2/SAML for multi-realm federation, fine-grained RBAC, token exchange flows, and a hybrid IAM lifecycle (guest → authenticated → federated) across Fastify API, React + Vite/Vik eSS R (as stated), and React Admin. Ships a multi-tenant MRV platform using React/Vite/Vike, Fastify, TypeScript, schema-per-tenant PostgreSQL, BullMQ, PostGIS + pgvector, Ollama LLM inference, and a versioned VCU calculation engine.

German / Remote Platform Engineer at Impact Network Worldwide / AI-native impact collaboration platform

December 1, 2025 - Present

Architects end-to-end production infrastructure using Terraform + Ansible IaC, Docker Swarm orchestration, Traefik v3, PostgreSQL with streaming replication + pgvector, and Redis; achieves zero-downtime deployments via GitHub Actions with encrypted secret rotation. Implements Keycloak OIDC SSO layer with multi-realm federation, JWT validation, RBAC, and seamless guest-to-full account lifecycle across platform services. Delivers a multi-tenant AI-native platform (React/Vite/Vike, Node.js/Fastify/TypeScript/React Native/Tauri) including semantic vector matching, a self-learning 6-source ingestion pipeline with browser automation, multi-lane LLM proposal engine, funder intelligence briefs, and an MCP server for agent-native access.

Chief Technology Officer at Kumo / Scalable carbon finance platform (VC $1M pre-seed raised)

October 1, 2024 - Present

Scaled remote team from 1 to 6 developers. Built and deployed multi-tenant platform and APIs in 6 months using DigitalOcean App Platform, GCP (BigQuery, API Gateway, Cloud Run), Auth0, Airbyte, and Atlas. Delivered sustainable finance platform serving 200+ projects, capturing 500+ datapoints per project into a data lake of 35k+ entries; implemented AI-powered verification, analytics, and custom formula/metrics engine. Owned technical decisions end-to-end (hiring, architecture, infrastructure, UX), drove product roadmap and cross-functional strategy, and engineered full-stack platform (React/Vite/Vike/Vitefunc as stated/Telefun c, Node.js, Python, Material UI/Panda CSS/Ark UI/Storybook/Chromatic Public Cloud Group/enterprise multi-cloud solutions for 400+ specialists across Europe).

Senior Full Stack & Cloud Engineer at Digital innovation / enterprise client projects

May 1, 2024 - October 1, 2024

Contributed to enterprise client projects in climate tech and education. Developed full-stack solutions (React, Node.js, PHP) deployed across AWS, Azure, and GCP. Implemented cloud migrations and integrations; built infrastructure-as-code and automated deployment pipelines for multi-cloud environments. Worked on IaC and deployments using GitHub and ArgoCD workflows.

Engineering Lead / Front-End Developer & Engineering Lead at Block Trust / Web3 commerce solutions (Blockchain Founders Fund-backed)

January 1, 2023 - December 31, 2023

Led a team of 4–5 developers across 3 continents; owned frontend architecture and stack decisions, contributed to backend strategy, and coordinated with an Asia-based QA team. Built a first-to-market portable NFT marketplace as a self-contained, plug-and-play solution; developed reusable UX/UI component libraries for a Web3 commerce platform.

Co-founder & Head of Development at Block/ Web3 and emerging tech consulting/ventures (as listed)

December 1, 2018 - December 31, 2023

Delivered consulting, MVPs, and technical architecture for Web3 and emerging tech projects. Built 2+ multi-tenant platforms using React, Node.js, and Python across AWS/Azure/GCP/DO. Provided technical training on cloud technologies and modern stacks for enterprise clients including PwC. Delivered end-to-end solutions from concept to production deployment.

Technical Consultant & Full-Stack Developer at Sensory Minds / Digital Innovations

May 1, 2016 - December 31, 2021

Delivered full-stack development, cloud infrastructure, and DevOps pipelines. Specialized in PHP/Node.js backends and React frontends for enterprise clients. Architected an API infrastructure for Germany’s leading early pay-TV-as-a-service platform serving high-volume streaming and subscription services.