01AI INTEGRATION · 2025
Multi-Store WhatsApp Operations Hub
LATAM RETAIL CHAIN · 12 LOCATIONS
+35%cart recovery 30 days
Workana ★ 5.0 · GOLD · 10+ in production · 0 disputes · GMT−3
AI integrations, Shopify revenue engines, custom dashboards. For SMBs that need software in production, not slides. Fixed scope. Milestone escrow on Workana. Your team keeps the repo, credentials, documentation, and runbook.
Workana DM · scope, price, timeline inside 48h · no commitment
★ 5.0WORKANA
10+IN PRODUCTION
100%ON-TIME
0DISPUTES
// the engagement
You send one problem. Inside 48 hours you get a signed scope, a fixed price, and a milestone breakdown on Workana. Build starts when you approve. Staging is live by day 7. On day 30 your team owns the repository, the credentials, the runbook, and the rollback playbook.
48hSigned scope reply
Day 7Staging environment live
Day 30Handover, full ownership
// case · whatsapp ops hub · 2025
before
12 stores, 200+ messages per store per day, 35% of leads dropped to slow human reply.
what I built
WhatsApp Business API + Claude routing + Make.com orchestration. Cart recovery at 6, 24, 72h. MongoDB persistence.
WhatsApp API · Claude API · Make.com · Node.js · MongoDB
result
+35%cart recovery in 30 days
// case · ai intake platform · 2026
before
$4k per month on Google Ads converting 1.2%. Partner answering every initial email himself.
what I built
WordPress redesign, 20+ visa pages by country, Claude API intake classifying case complexity, CRM auto-routing, privacy-first.
WordPress · Claude API · Custom CRM · Tailwind · Cloudflare
result
+62%qualified leads in 90 days
// case · address normalization · 2025
before
600,000 Argentine addresses. 3-person team copy-pasting Google Maps for a month per batch.
what I built
Python + FastAPI service. OpenStreetMap + Google Geocoding. Confidence scoring (95% auto-accept). Dockerized, JWT roles, async workers.
Python · FastAPI · PostgreSQL · Docker · OSM · Google Geocoding
result
5hvs 1 month, 95% auto-accept
// pricing
Four offers. Fixed scope. Milestone escrow.
Typical engagements USD 900 to 4,500. Up to 7,000 with David De Vito on backend. 48h reply on Workana. No retainers. No surprise quotes.
011–2 weeks
Production AI integration
Plug Claude API or OpenAI into your existing CRM, support, ops or content pipeline. Webhooks + Make.com or n8n + system prompts trained on your context. Auth, rate-limiting, error handling, Sentry monitoring, runbook for the team that inherits it. Entry option: AI mini-audit + 1 working prototype, USD 300-600 in 3-5 days.
Claude APIOpenAIMake.comn8nWebhooks
starting at$900
range $900 – $2,200
recent
- Genesis · +62% qualified leads
- AutoFlow · 12 stores, 2.4k conv/day
- RONDASALUD · Healthcare social + booking
022–3 weeks
Shopify Plus + Klaviyo revenue system
Subscription-first storefront, multi-currency checkout (Shopify Markets), 6-flow Klaviyo lifecycle email, WhatsApp recovery for LATAM. Last 4 builds: +18% AOV, +32% retention, +47% subscribe-rate (per-client baselines documented in case studies). Smaller scope: Klaviyo revenue setup only (3-4 flows, deliverability, segments, attribution), USD 800-1,500.
Shopify PlusLiquidKlaviyoMJMLWhatsApp APIGTM
starting at$1,800
range $1,800 – $3,500
recent
- DermaPro · +47% subscribe rate
- Bambua · +18% AOV, email = 28% revenue
- Ruffitos · +28% repeat purchase
031–6 weeks
Backend, mobile or PWA layer
Python + FastAPI + PostgreSQL + Docker for the work that doesn't fit a SaaS box. Mobile interfaces for the same system: PWA with Supabase (USD 1,500-3,500) or React Native iOS+Android with auth, push, store submission (USD 2,500-5,000 solo, up to 7,000 DUO). With David De Vito (Backend ★ 5.0) on larger scope: single contract, single Workana payment, two devs delivering.
PythonFastAPIPostgreSQLDockerMQTTOAuth2
starting at$1,500
range $1,500 – $7,000
recent
- AmexDir · 600k addresses, 1mo → 5h
- Voltra · 11 issues caught in 6mo
- CRM Pipeline · +28% close rate
042–3 weeks
Scroll-driven 3D web
Scroll-driven 3D for product pages, brand showcases, or premium portfolios. Three.js, GSAP Observer, Lenis, GLSL shaders, KTX2/Draco GLBs. Mobile fallback uses static visuals with identical copy. Opt-in tier, only when your product or brand justifies the production cost.
Three.jsGSAPLenisGLSLKTX2/DracoR3F
starting at$2,000
range $2,000 – $4,000
recent
- klikaylo.dev · this site (mid-page scene)
- Premium D2C showcase · NDA
- Hardware product page · prototype
“Excellent web developer, committed down to the smallest detail.”Fernando Camargo · Genesis · ★★★★★
“Delivered everything as planned, even helped solve issues that came up.”Adonay S. · Mobile App PT-BR · ★★★★★
“Strongly committed to the project from day one.”Adonay S. · ★★★★★
// workana starter sprint
Workana Starter Sprint
3–5 days
1 to 3 static pages, responsive, copy laid out, contact form or WhatsApp link, Google Analytics, basic SEO, deploy on Vercel or Cloudflare Pages. No admin, no login, no CMS, no e-commerce, no AI. Owned by you in your account.
For first Workana projects when the business needs trust before systems. If you bring text and brand assets ready, the floor stays at USD 400.
range$400 – $700
// supporting capabilities
React Native iOS and Android apps. MQTT/IoT pipelines. Internal CRM dashboards. Email infra (MJML + Klaviyo). Available when the core engagement requires them, not pitched as standalone offerings.
// work, 2024 to 2026, 10+ production builds
The systems behind the numbers.
9 case studies below. Some additional engagements are under NDA and described without naming the client.
01
02AI INTEGRATION · 2026
AI Intake Platform for Law Firm
US IMMIGRATION LAW PRACTICE
+62%qualified leads in 90 days
03SHOPIFY + KLAVIYO · 2025
Subscription-First Shopify Plus Storefront
PREMIUM D2C SKINCARE BRAND
+47%subscribe rate
04BACKEND / AUTOMATION · 2025
Address Normalization at Scale
ARGENTINE FINTECH ENTERPRISE
120Krows / hour
05AI INTEGRATION · 2025
Sales Pipeline Automation Layer
B2B SAAS · 8-PERSON SALES TEAM
+28%close rate in 60 days
06MOBILE / CI-CD · 2024
Mobile App + CI/CD Pipeline
LATAM FINTECH STARTUP
8minvs half-day manual
07SHOPIFY + KLAVIYO · 2025
D2C Storefront + Lifecycle Email
HOME GOODS BRAND
+18%AOV from upsell
08BACKEND / AUTOMATION · 2025
Industrial IoT Monitoring Dashboard
INDUSTRIAL SOLAR INSTALLER
11issues caught in 6 months
09AI INTEGRATION · 2026
Healthcare AI Social + Booking Bot
HEALTHCARE COMPANY
60saverage reply time
10+ builds in production, 0 disputes, 100% on-time. Workana profile: workana.com/freelancer/federico-klikaylo
// how I work
Inquiry to production in three locked steps.
01
Diagnose
You send the broken workflow on Workana. I respond within 48 hours with three honest answers: what I would build, how long it takes, what it costs. If it is not a fit, I tell you straight away and suggest who to ask. No script. No commitment.
02
Architect
Signed spec before any code. Architecture diagram, milestone breakdown, escrow setup on Workana. You approve and release each milestone before the next one starts. No work happens off-escrow.
03
Ship
Build with one short Loom per milestone. Staging from day 7. Final handover: documentation, repository access, credentials, rollback playbook. 15-day bugfix window included after final milestone (anything in the agreed scope, fixed at no charge).
// fit check
Better to filter now than to fix later.
good fit if
- You ship a real product or service to real customers.
- You can describe the problem in one paragraph.
- You can review work and send feedback inside 24 hours.
- You have signed-off budget for the engagement.
- You want one accountable owner, not an agency layer.
not for you if
- You are exploring AI with no system in production yet.
- You want a free consultation that turns into a quote later.
- You will disappear for a week mid-build.
- You expect scope to grow inside the same fixed price.
- You want a designer, a copywriter, and 6 strategists.
// honest questions
What you actually want to know.
Send me one broken workflow on Workana, in one paragraph. Within 48 hours I reply with three concrete fixes or, if it is a fit, a 5-minute Loom walkthrough of the proposed system. Hard limit: one workflow per company. It is not a 30-minute open consultation, an unbounded audit, or a pre-sale call. If it is not a fit, I tell you who to ask.
Most engagements land between USD 900 and 4,500 solo, or up to USD 7,000 with David De Vito on backend-heavy scope. There is also a Workana Starter Sprint at USD 400-700 for 1-3 page sites when the business needs trust before systems. After the initial diagnosis I send you a fixed number, not a range. If it does not match your budget I tell you straight away.
Both. Smaller engagements (sites, integrations, automations) I deliver alone. For larger scope (SaaS, custom platforms, complex backends) I partner with David De Vito (Backend Python/FastAPI/PostgreSQL/Docker, Workana 5.0★). Single contract, single Workana payment, two devs delivering. You always talk to one person, me.
Workana provides escrow, international invoicing and protection for both sides. The 5.0 rating with 9 reviews and 4 returning clients was built there. After the first project we can talk about direct contract if you prefer.
Usually 3 to 7 days from the moment we lock scope. If something is urgent, mention it in the first message. I do not take projects I cannot give the attention they deserve.
15 days post-delivery support included: if anything in the agreed scope does not work as it should, I fix it at no charge. If the issue comes from scope changes on your side, I send you a clear addendum before touching anything.
Optional monthly retainer: USD 400 to 800 per month, max 8h capped, no obligation. Or you take the runbook and rollback playbook and handle it in-house, that is exactly what they were written for. I prefer clients who graduate, not who depend.
Yes, for any project where it makes sense, I sign a mutual NDA before we even start the diagnosis. Send me the agreement and I will sign it on day one.
Yes. Most of my Workana clients are LATAM and Brazil, but I also work with US and EU founders. International payment is handled by Workana (USD, EUR or BRL). Time zone GMT−3, flexible with overlap for US East and EU.
// workana only · all engagements through escrow
Send me the broken workflow.
One paragraph on Workana. Within 48 hours I reply with three concrete fixes or, if it is a fit, a 5-minute Loom walkthrough of the proposed system. Workana escrow protects both sides.
Workana DM · 48h reply · no commitment
★ 5.0Workana GOLD
10+in production
100%on-time
0disputes