I will build a custom ai agent or rag app on your company data


About this gig
Want an AI agent that actually works on your data, not just a demo? I build AI agents and RAG apps that answer from your documents, use your tools and stay reliable in production.
I'm co-founder and CTO of an AI-native engineering lab in Vienna and a data engineer with five years on telco data platforms. My agents are built like data products: tested, logged and cost-controlled.
What I build:
- RAG assistants over your documents, website or knowledge base
- Agents that use tools: CRM, database, email, Slack, calendars, APIs
- Voice agents (ElevenLabs) for bookings and support
- Agents that safely query your data warehouse (BigQuery, Postgres)
- Evaluation sets, guardrails, monitoring and cost dashboards
Stack: Python, TypeScript, Claude, OpenAI, Gemini, LangChain, Supabase, open-weight models when data must stay private.
How I work:
1. We define the use case and what good answers look like
2. I build a prototype on your real data
3. I harden it: evals, guardrails, deployment
4. Handover with docs and a walkthrough
You own the code and your API keys. EU-based and GDPR-aware.
Please message me first with your use case.
Get to know Balint D
Data Engineer
- FromHungary
- Member sinceSep 2026
- Avg. response time1 hour
- Last delivery4 days
Languages
Hungarian, English, Spanish, German
My Portfolio
FAQ
Which AI models do you use?
Claude, OpenAI, Gemini and Grok by default; open-weight models when data must stay on your infrastructure. I pick per use case and cost.
Who pays for API usage?
You do, with your own API keys and accounts. I estimate monthly usage cost before we start.
What if the agent gives a wrong answer?
Answers are grounded in your content, tested on an evaluation set, refuse when unsure and can hand over to a human.
Is my data safe?
Your data stays in your accounts. EU hosting options, no training on your data, NDA on request.
What do you need to start?
The use case, sample documents or data access, the tools to connect and 10–20 example questions with good answers.
Do I get the source code?
Yes, in your repository, with setup instructions.
Can you improve an agent I already have?
Yes: I can audit it, build evals and fix reliability issues. Message me for a custom offer.
What counts as a revision?
Changes within the agreed scope. New integrations or channels are extras.
1 reviews for this Gig
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Rating Breakdown
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M 
marvs_portland

Honduras
Great working with you. Professionalism of work, Proactive communication and Delivery time.
$50
Price
6 days
Duration
B 
Seller's Response
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1 reviews for this Gig
| (1) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
M 
marvs_portland

Honduras
Great working with you. Professionalism of work, Proactive communication and Delivery time.
$50
Price
6 days
Duration
B 
Seller's Response
Helpful?

