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KEVIN GUIFARRO · PRODUCTION AI ENGINEERING · COSTA RICA (CST)

Demos run once.
Systems run every day.

AI agents and integrations shipped with evals, observability and docs — built by the same senior engineer who answers when they break. This page follows one build through the pipeline.

8 YRS FORTUNE 5005.0 UPWORK · VERIFIEDWHITE-LABEL FIRST
01 / INTAKE

One brief. One engineer.
No telephone game.

The person who scopes is the person who quotes, builds and answers. You brief me once — no bench of juniors, no account manager translating your requirements into someone else's backlog.

OBJECTIVEAutomate intake → briefing
STACKn8n · Claude · Postgres
TIMELINE2 weeks — evals from day one
02 / BUILD

Assembled from parts that survive production.

No exotic frameworks, no science projects. Boring, proven infrastructure wired around your workflow — because 2am incidents don't care how clever the demo was.

n8nCLAUDE APITYPESCRIPTRAGPOSTGRESDOCKER
03 / EVALS

“It works” is a number,
not a feeling.

Every build carries an eval suite from day one — accuracy, latency, cost per run. If it can't be measured, it didn't ship.

96.4
EVAL ACCURACY %
1.8
P95 LATENCY S
0.041
COST PER RUN $
04 / OBSERVABILITY

If you can't see it running, it isn't.

Dashboards, logs, alerts — you and your client can watch it breathe. When something drifts, I know before you do.

UPTIME 99.97%OPEN ALERTS 0LIVE
07:00:00 whis.brief — assembled 6 sources · ok
07:00:02 gmail.oauth — token refresh · ok
07:00:04 calendar.pull — 4 events · ok
07:00:05 dedup.check — 0 repeats · ok
07:00:07 telegram.send — brief delivered · ok
07:14:31 eval.nightly — accuracy 96.4% · pass
08:02:19 cost.watch — $0.38 today · under budget
09:00:00 heartbeat — all systems nominal
07:00:00 whis.brief — assembled 6 sources · ok
07:00:02 gmail.oauth — token refresh · ok
07:00:04 calendar.pull — 4 events · ok
07:00:05 dedup.check — 0 repeats · ok
07:00:07 telegram.send — brief delivered · ok
07:14:31 eval.nightly — accuracy 96.4% · pass
08:02:19 cost.watch — $0.38 today · under budget
09:00:00 heartbeat — all systems nominal
05 / HANDOFF

Your logo ships.
Mine doesn't.

White-label by default, NDA-first. Every build lands with everything your team needs to run it without me — and I never poach clients.

EVAL SUITE
OBSERVABILITY DASHBOARD
DOCS THAT SURVIVE ME
HANDOFF VIDEO
06 / PROOF

This pipeline isn't hypothetical.

Whis — my AI chief of staff — runs on it right now. n8n + Claude + Postgres, OAuth'd into calendar and mail, confirmation gates on every write action. It briefs me at 7:00 every morning.

07:00:00  WHIS → morning brief delivered · 0 errors

Most of my white-label work ships under someone else's logo — that's the point. References available on request.

07 / TERMS

Fixed price. Fixed scope.

PILOT SPRINT
One agent, end-to-end in 2 weeks. The cheapest way to find out if we fit.
from $[X]
PRODUCTION BUILD
The full system — shipped with evals, observability, docs and a real handoff.
from $[X]
KEEP IT ALIVE
Monitoring, model updates, drift checks — and a human who answers at 2am.
$[X]/mo
08 / CONTACT

Send the build your team doesn't have time for.

kevin@guifarro.devCLICK TO COPY
SYSTEMS, NOT DEMOS — BUILT IN COSTA RICA · © 2026 GUIFARRO.DEV