chern0.dev

Services

Four fixed-scope engagements. One senior person owns the whole thing, from the first question to the launch.

2–3 weeks · from €6k

AI Product Sprint

From idea to an evidence-based go or no-go.

  • Market and competitor research with dated sources
  • Unit-economics model: cost per user, cost per request, margin at scale
  • Architecture and model shortlist, with a small bake-off on your real inputs
  • A working prototype of the core loop

Proof: Clearcut, Glyco and Photco research; the HireMike voice-stack decision.

6–10 weeks · from €25k

Idea to Launch

A production MVP that can take payments on day one.

  • Auth, billing, analytics, status page and cost alerts
  • Built in vertical slices; you verify each one before the next starts
  • CI, docs and a handover, so your team or the next engineer can continue
  • You own the code, the cloud accounts and the data

Proof: Clearcut went from first commit to paid launch in 6 days.

1–2 weeks · from €4k

AI Reliability & Cost Review

For teams with an AI feature that is flaky or expensive.

  • An eval harness on your real traffic, with quality, latency and cost per request
  • A model bake-off, including cheaper and open-weight options
  • Fallbacks, guardrails and caching where they pay off
  • A written report with the changes ranked by impact

Proof: Agent eval harnesses, Whisper hallucination gating, rule-oracle bake-offs.

2–4 weeks · from €8k

Agentic Engineering Setup

Coding agents working inside your team, safely.

  • Ticket to reproduce-first test to draft PR, running in your CI
  • Review agents and PR-comment responders
  • Claude Code or Codex harnesses with skills, hooks and permissions
  • A buildability agent that checks designs against your codebase

Proof: Jira-to-PR agents and a Figma buildability agent in production use.

Questions
How much does it cost to build an AI MVP?
A production MVP with auth, billing and analytics starts at €25k and usually takes 6–10 weeks. If the idea isn’t validated yet, start with a 2–3 week AI Product Sprint from €6k. It ends with a prototype, a cost model and a go or no-go.
Do you work with non-technical founders?
Yes. You get a written brief, a decision log and a working slice to try every week, in plain language.
Which models and clouds do you use?
Whatever the measurements favour. I have shipped on Claude, GPT, Gemini, Amazon Nova and open-weight models, on AWS (Bedrock, Lambda, Step Functions), Cloudflare Workers and serverless GPUs. I pick models with an evaluation and a cost per request, never by habit.
Who owns the code?
You do: the repository, the cloud accounts and the data, from the first day.
Where are you based?
Sarajevo, Bosnia and Herzegovina (CET). I work remotely with teams in the EU and the US.