AI Systems Builder · Prompt Engineer · Operator

Roderick
Stroethoff

I build production AI agents, LLM automations and full operational platforms, then run a real business on top of them.
Dutch · Based in Marbella, Spain.

Roderick Stroethoff
Marbella, Spain
🤖 Production AI agents in daily use
🧠 Claude-powered systems, shipped
⚙️ Full ops platform, built solo
🌍 Multilingual LLM tooling (4 langs)
🏠 3× Airbnb Superhost
About
Who
I am.

I'm a Dutch AI systems builder and prompt engineer based on the Costa del Sol. I build production-grade AI: autonomous agents, LLM-powered automations and complete operational platforms. The difference is that I actually run these things in the real world every day, not in a demo.

My edge is that I'm an operator who codes. A decade in international trade and hospitality taught me exactly where a business bleeds time and money, and modern AI lets me close those gaps with software I write myself. I like taking a messy real problem and turning it into a working, deployed system in days rather than months.

Right now that mostly shows up as Premavista, a Costa del Sol rental business I've rebuilt from the ground up on AI. It runs on a custom operations platform, a multilingual guest concierge agent, automated invoicing and reporting, and a set of Claude-powered assistants handling the back office. Alongside it I keep building: voice tools, a live call interpreter, trading agents, video automation. I work across four languages and I'm happiest at the point where prompt engineering, product and operations meet.

10+AI Systems Live
DailyShipping AI
4Languages
3×Airbnb Superhost
AI & Automation
I build
with AI.
01
Autonomous agents in production
I build and run Claude-powered agents that operate a real business unattended. A guest concierge that answers in four languages with photo and location awareness, back-office assistants that draft invoices and reports, and scheduled routines that run 24/7 on their own.
02
Prompt engineering as a discipline
I treat prompts like software: versioned system prompts, tool definitions, guardrails and eval loops. I know how to get reliable, structured, on-brand output from an LLM at scale, and how to keep it stable once real users and real money are on the line.
03
Full systems, not just chatbots
I build the whole stack around the model: FastAPI and PostgreSQL backends, PDF generation, iCal and API integrations, auth, deploys on Railway. The model is just one component inside a production platform I've built end to end.
04
From problem to deployed, fast
Whether it's a customer-facing agent, a document-extraction pipeline or an internal ops tool, I get from a messy real problem to a live, LLM-driven system in days. Then I run it in production, watch how it behaves and keep improving it.
Toolkit
What I
build with.

Models & LLMs

  • Claude (Opus, Sonnet, Haiku)
  • Tool use & agents
  • Structured output
  • Vision & multimodal
  • Prompt engineering & evals

Backend & Infra

  • Python & FastAPI
  • PostgreSQL & SQLAlchemy
  • Railway & Docker
  • Telegram & WhatsApp bots
  • iCal & REST integrations

Voice & On-device

  • Real-time speech-to-text
  • Parakeet on Apple MLX
  • Text-to-speech & voice cloning
  • Live translation pipelines
  • Swift audio process-tap

Automation

  • Autonomous scheduled agents
  • Document extraction
  • PDF & report generation
  • Content & social pipelines
  • Invoicing & back-office ops
Experience
Ten years
in the field.
2023
→ Now
AI Systems Builder & Prompt Engineer
Independent
Building and running production AI: autonomous Claude-powered agents, LLM automations and full operational platforms (FastAPI · PostgreSQL · Railway). Multilingual customer-facing bots, document-extraction pipelines, invoicing and reporting systems, real-time voice tools and scheduled agents running 24/7. All shipped, all in daily use.
2024
→ Now
Co-Founder & COO
Premavista · Marbella
Boutique short-term rental management on the Costa del Sol, rebuilt on a custom AI stack I wrote myself: ops platform, guest concierge agent and automated back office. Three-time Airbnb Superhost. Owner acquisition, guest experience, pricing and operations across Airbnb and Booking.com.
2018
→ 2024
Sales Manager → Founder
Import & Export · China Sourcing
Led commercial operations at an international solutions company, driving revenue across European markets. Later co-founded Vonets, a sunglasses brand sourced and scaled from China, handling supplier negotiations, brand development and sales growth end to end.
2018
→ 2024
Course Instructor
Udemy · Online Education
Practical business courses on importing from China and e-commerce. Over 7,000 students enrolled across Spain and Latin America, averaging 4.5 stars.
Work
Projects
& Ventures.
08
AI Platform · Flagship Build
Premavista Hub
A complete operations platform I built solo, and the single source of truth for the whole rental business. Bookings with computed economics, Spanish RD-compliant invoicing with gap-free numbering, one-click monthly close with PDF preview, owner reports, and cleaning and check-in scheduling pulled live from property calendars. FastAPI · PostgreSQL · Railway.
Internal · live in production
AI Agent · Multilingual
Premavista Concierge
A Claude-powered guest concierge on Telegram. Guests ask anything in plain language across four languages, and the agent answers with area-specific knowledge, live web search, photo understanding and location-aware recommendations, then hands off to a human when needed. Runs 24/7, unattended.
Live for Premavista guests
Real-time Voice · Speech AI
CallBridge
A live two-way call interpreter for Russian and English. It taps into a call, transcribes each side, translates, and speaks the result back in a natural voice with roughly a two to three second delay. Runs on Telegram and WhatsApp using a process-tap audio architecture I wrote in Swift.
Private · working
On-device AI · Speech
Flow Local
My own private, fully offline dictation app for the Mac. Hold right-Option, talk, and it transcribes on-device with a Parakeet MLX model and cleans the text up with a smart rewrite pass. Streaming keeps most dictations around half a second, and nothing ever leaves the machine.
Private · daily driver
Autonomous Agent · Finance
Investment Agent
An autonomous trading agent that researches the market on its own, forms and sizes positions across the S&P 500, Russell 2000 and crypto, and reports every move to me on Telegram. Trades on Alpaca paper, deployed on Railway, and tunes its own entries and exits.
Private · running 24/7
Media Automation · Voice
Video Pipeline
A video automation pipeline for Amazon Influencer content. It transcribes source footage, translates it, and regenerates the voiceover in cloned voices, so a single recording turns into clean product videos in more than one language.
Private · in use
AI Agent · Vision
NutriTrack
A Telegram nutrition agent powered by Claude vision. A client photographs a meal and the model identifies the food, estimates the macros and logs everything automatically, in English or Spanish. A clean example of multimodal AI doing real work.
nutritrack.es
Property · The Business
Premavista
Boutique short-term rental management on the Costa del Sol, the real business my AI systems run. Three-time Airbnb Superhost delivering consistent 5-star stays on Airbnb and Booking.com, with an entirely AI-powered back office.
premavista.com
Contact
Let's
talk.

An AI role, a system you need built, prompt engineering for your product, or property on the Costa del Sol. If it's interesting, I'm open to it.

Email me LinkedIn