Custom LLM Integration
Language models built into your product, not bolted on beside it.
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About the service
We integrate large language models directly into your software: intelligent search, automated classification, summarisation, natural language interfaces to your data and agentic features that carry out multi-step tasks. Work includes model selection, prompt and tool architecture, evaluation harness, cost control and production monitoring.
-58%
model cost after routing and caching optimisation
200+
test cases in a production evaluation suite
4-10
weeks from proof of concept to production feature
Challenges we solve
- #1
The prototype impressed everyone and fails on ten percent of real inputs.
We build an evaluation suite from real production data, measure per case, and add validation, retries and deterministic fallbacks for the failure modes that matter.
- #2
The monthly model bill grows faster than the feature earns.
We route simple requests to a small cheap model and only escalate hard ones, cache repeated prompts, trim context aggressively and set per-user spend limits.
- #3
The output format varies and breaks the code that consumes it.
We use structured output with a strict JSON schema, validate every response and retry with a corrective instruction, so the downstream system always receives a predictable shape.
- #4
Compliance asks who is liable when the model gives wrong advice.
We define the risk class under the EU AI Act, restrict the feature to advisory use with a human decision step, log inputs and outputs and document limitations in the interface itself.
Custom LLM integrations
A demo takes a weekend, a production feature takes rigour. We build with an evaluation set, structured outputs validated against a schema, fallbacks when the model fails and hard limits on token spend per user. Model choice stays swappable behind an abstraction layer, so when a cheaper or better model appears you change a configuration value rather than rewriting the feature. Costs, latency and quality are visible in a dashboard from day one.
Recommended services
- 01 - 7AI voice agents (AI telephony)Every call answered in German, at midnight and during the rush.
- 02 - 7AI chatbots & assistantsAn assistant that answers from your documents, not from guesswork.
- 03 - 7CRM integration & automationStop copying data between tools that should already talk.
- 04 - 7Sales pipeline automationEvery lead followed up, scored and routed without a reminder.
- 05 - 7Document & data processing (RAG)Turn contracts, invoices and PDFs into data you can query.
- 06 - 7Workflow automation (n8n / Make / Zapier)Replace the recurring manual task with a process that never forgets.
- 07 - 7AI content generationPublish ten times more, without sounding like a machine.
Frequently asked questions
A focused feature such as classification or summarisation starts at 4,000 EUR. Agentic features with tool use and a full evaluation harness typically run 12,000 to 40,000 EUR.
Commercial hosted models where quality matters most, and open models such as Llama or Mistral on EU infrastructure where data must stay in house. We benchmark candidates on your data before committing.
Rarely, and only after retrieval and prompt work hit their ceiling. Fine-tuning helps most for tone and format consistency; for factual accuracy retrieval is almost always the better and cheaper answer.
We use enterprise endpoints with training explicitly disabled and zero data retention where available, and we mask personal data before requests leave your systems.
Most business features fall into the minimal or limited risk category, which mainly means transparency obligations. We assess the classification with you and document the technical measures required.
ourclients
- Markus LehmannReview from Google2 months ago
websitebestellen exceeded our expectations! The new website is modern, fast and precisely tailored to our target group. Working together was straightforward and highly professional. A clear recommendation!
- Sabrina HoffmannReview from Google2 months ago
Great experience from start to finish! The team at websitebestellen advised us excellently, implemented our wishes and created a wonderful website. Absolutely recommendable!
- Lea SchneiderReview from Google2 months ago
websitebestellen took our online presence to a new level! The site not only looks great, it also brings us noticeably more enquiries and customers. Thank you for the excellent work!
Related reading
- AI telephony: when it pays off and when it does notA sober look at voice agents for German SMBs: the call volumes that justify the investment, and the situations where a human is simply cheaper.
- RAG chatbots on your own documentsHow retrieval-augmented generation works in practice, what it costs, and why data preparation decides whether the answer is trustworthy.
- Mobile app or PWA? A decision guideWhat a progressive web app can do in 2026, where a native app is still unavoidable, and how the costs compare over three years.
Your contact person
Miriam Kraus
I read every request personally and get back to you within one business day.