AI agents & LLM applications
Custom conversational agents and assistants over your data. RAG, tool use, source citations and human escalation.
More →David Sak · developer & co-founder of SiteSpot
I build AI agents, automations and websites that give you time back.
I design and ship custom AI agents, data pipelines and web applications, from first idea all the way to production. The code and data stay yours.
30-min intro call · free · I reply within 24 hours
Currently working on: AI agents
Technologies I work with daily
Who I am
I connect ideas with code.
I love taking an operational problem apart and building a solution that actually runs, not a prototype for the drawer. Ideally at the intersection of AI, automation and clean web.
AI
Human
0+
completed projects
and deployments
0yrs+
of development
and automation practice
0+
technologies in
active use
0%
of code and ownership
stays with the client
Indicative numbers based on my track record so far.
What I do
Four things I do best.
From agents on top of language models to fast web applications. Always built to be secure, understandable and easy to grow further.
Automation & integrations
I connect mismatched APIs and legacy systems into one pipeline, so manual data re-typing disappears completely.
More →Data, RAG & backend
Secure querying over documents, vector databases and a robust backend with a clean, custom API.
More →Web, apps & consulting
Fast, accessible websites and web applications. Or just a consultation and a second opinion on how to approach it.
More →Code, not slides
I'd rather show than promise
A piece of real code from my projects, from AI agents through RAG to automations. It types itself, just watch.
Integrations
I connect what you already use
No need to switch systems. I hook into the tools you already work in and make them cooperate.
Slack
Notion
HubSpot
Steps processed in this demo1 200
Stripe
PostgreSQL
Zendesk
Live demo
This is how an agent I build talks
Click a question and the agent answers over a sample operations base. Every answer cites its source; when unsure, it hands over to a human.
Ask anything from the sample operations base. I'll answer and cite the source.assistant · private cloud
⌀ response: 2.1 s80% of tasks without a human● runs in your cloud
Sample data, I'll demo an agent over your systems live.
What working together looks like
From the first call to a running solution in four predictable steps.
Book an intro call
Step 1 · intro call
Understanding the brief
We go through what you need and what you want to achieve. Free and non-binding, sometimes the outcome is that you don't need a solution at all.
Step 2 · proposal
Proposal & budget
You get a concrete plan: scope, technologies, price and timeline. No surprises halfway through the project.
Step 3 · build
Build & deploy
I build the solution, show progress along the way and ship it to production. You see where every crown goes.
Step 4 · ongoing
Support & growth
After handover I stay around, maintenance, tweaks and next phases as the solution grows with you.
Ways of working
How we can work together
From a quick consultation to long-term development. We always agree on scope and price up front, so you know what you're getting into.
1
Consulting
Quick help & second opinion
I'll advise on architecture, review your code or help unblock a specific problem.
1200 CZK /hour
Get in touch
- Consulting on AI, automation or web
- Code review and an architecture second opinion
- Solution design, which way to go
- No commitment to further work
Custom project
From idea to production
I design, build and deploy the whole solution. Websites from CZK 12,000, automation and AI agents from CZK 25,000.
from 12 000 CZK
Get in touch
- Solution design, budget and timeline
- Development, integration with your tools, deployment
- Secure setup over your data
- Handover with documentation, the code is yours
3
Long-term
Ongoing development & care
I take your systems under my wing and keep evolving them based on what production shows.
by agreement /month
Get in touch
- Dedicated capacity every month
- Maintenance, tweaks and new features
- Stability monitoring and updates
- Priority response and direct communication
Comparison
Freelancer, agency, or in-house team?
An honest comparison of the three paths. If another one is better for you, I'll tell you straight on the intro call.
| With me★ best value |
Agency | In-house team | |
|---|---|---|---|
| Communication | directly with me | through an account manager | internal, but drains people |
| Price | no agency margin | higher overhead and markups | payroll costs of a team |
| Start | days to two weeks | weeks | months (hiring) |
| Flexibility | high, I adapt with you | medium, per their process | bound by capacity |
| After handover | code and docs are yours | depends on the contract | yours |
Verdict: for projects up to ~3 months I'm the fastest and cheapest path. For permanent full-time operations it's fair to build an in-house team, and I'll gladly help you hire it.
Selected projects
What I've worked on
Selected websites and applications I've built. Click a preview to see them live.
Client website
Optik Dvořák
Website for a family-run optician in Pilsen, eye exams, designer frames, offers and contact.
🔒 Client website
Richard Topinka
Portfolio for a fine-art and portrait photographer from Pilsen. Themed galleries with a focus on atmosphere.
🔒 Client website
Autoservis Topinka
Website for a car repair shop in Pilsen, services, inspections, pricing, booking and contact.
Side project
Lynx Studio
Creative studio for startups and brands, digital experiences that connect and perform.
Side project
Synthetix
Landing page for AI automation and integrations, from hero to call to action.
Side project
Vrstva
Studio for tech brands, strategy, design and development on one site.
Side project
Synapse
Studio for UI/UX, branding, illustration and web, a portfolio presentation.
Profile
Who is David Sak
No anonymous agency. One person who puts his name on every deployment.
David Sak
Developer · co-founder of SiteSpot
I design architecture, write code and ship to production. You talk directly to me from the very first call, no salesperson between you and the solution. Besides my own projects I co-founded SiteSpot, a studio building websites and automations for companies.
I like working at the intersection of AI, automation and clean web. When more hands are needed, I bring in trusted specialists, but the responsibility for the result stays with me.
- I communicate directly and explain technical decisions.
- I build things so they can grow even without me.
- I'd rather say "you don't need this" than sell you something useless.
Frequently asked questions
Clear answers on how I work, what I build with and what you get. No fluff.
✉ business@dsak.techDo you work remotely and outside the Czech Republic?+
Yes. I handle most work remotely, across the Czech Republic and abroad. I'm happy to add an in-person meeting in Pilsen when it makes sense.
What technologies do you build with?+
Most often Python and TypeScript, React and Node.js, PostgreSQL and vector databases for data, and large language models with RAG architecture for AI features.
Do you take smaller jobs or just a consultation?+
Yes. Besides larger projects I also do short consultations, code reviews or a second opinion on architecture. Feel free to reach out even with something small.
Who owns the code you write?+
You do. After handover and final payment you own 100% of the code and intellectual property, including documentation and access.
How quickly can you start?+
Depends on current capacity, usually within days to two weeks. Send me your brief and I'll give you a realistic timeline and price.
How much does it cost?+
Roughly: consultation CZK 1,200/hour, websites from CZK 12,000, automation and AI agents from CZK 25,000. You get an exact written quote after the intro call, and it holds, no extra charges without approval.
What happens to our data?+
Nothing leaves your infrastructure without your knowledge. I use APIs with no data retention or models running on your side, and I'm happy to sign an NDA before looking into your systems.
What if the result doesn't work?+
Before building, we agree in writing on what the solution must do. I hand over only once it meets that, and I fix handover defects within the agreed price.
Contact
Let's get to work.
Tell me what you're dealing with. I reply within 24 hours, usually sooner, no obligations, no sales talk, straight to the point.
Phone
+420 606 123 573
prefer calling? go ahead
Book a call
pick a slot in the calendar
⌀ I reply within 24 hours
Send me a message
- You communicate directly with me.
- You leave with a clear offer and timeline.
Explore
Dive deeper
Every skill, project and article has its own page. Click through to exactly what interests you.
What I do
AI agents & LLM
Custom conversational agents over your data.
Open→ What I doAutomation
Connecting mismatched APIs and legacy systems without re-typing data.
Open→ What I doData & RAG
Querying your own documents inside private infrastructure.
Open→ What I doWeb & consulting
Fast websites, web applications and a second opinion on architecture.
Open→ WorkProjects
Concrete projects with a breakdown of brief, solution and result.
Open→ BlogArticles and notes
When an AI agent pays off, RAG in practice, automation without replacing systems.
Open→ ProfileAbout me
Who I am, how I think and what I work by.
Open→ ContactWrite to me
Reach out with your brief, we'll set up a no-strings call.
Connect→