Client Work

Real builds. Real numbers. Verifiable reviews.

Every claim on this page traces to a verifiable Upwork engagement. Some client names are withheld under confidentiality; the reviews are public on our profile either way.

Detailed case studies

Eight builds, documented screen by screen

Architecture, workflows, run logs and the rules we worked inside. Client names and private data are hidden; the numbers are from the live systems.

Outbound WhatsApp AI agent for a real-estate agency
Case study 01

Outbound WhatsApp AI agent for a real-estate agency

15 n8n workflows in production
11 WhatsApp templates approved by Meta
9 Postgres tables on Supabase
Read the case study
Keap to GoHighLevel migration for Fresh Start Health Retreat
Case study 02

Keap to GoHighLevel migration for Fresh Start Health Retreat

8,000+ contacts deduplicated and cleaned
45,750 logged API calls, 0 rate limits
4 wks from hire to Keap switched off
Read the case study
Landing page rebuild in the GoHighLevel funnel builder
Case study 03

Landing page rebuild in the GoHighLevel funnel builder

2 program pages rebuilt, two brands
4 funnel steps each, call to booking
3 custom code blocks, all documented
Read the case study
GoHighLevel agency build for an energy-sector marketing agency
Case study 04

GoHighLevel agency build for an energy-sector marketing agency

1,592 newsletter sign-ups processed
8 sub-accounts in one agency
7 lead automations for a contractor
Read the case study
AI chat agent on WhatsApp and Instagram for a Pilates studio
Case study 05

AI chat agent on WhatsApp and Instagram for a Pilates studio

3,279 conversations handled
2,644 AI replies delivered
465 message bursts batched into one reply
Read the case study
Bilingual AI voice agent on Retell that books into GoHighLevel
Case study 06

Bilingual AI voice agent on Retell that books into GoHighLevel

2 languages, matched to the caller
0.8-1.3 s model latency
$0.14 per minute to run
Read the case study
Multi-agent AI voice system on Retell, n8n, Supabase and GoHighLevel
Case study 07

Multi-agent AI voice system on Retell, n8n, Supabase and GoHighLevel

46+ client sub-accounts on one build
1.49M+ records behind the system
5 min from a dropped call to an AI callback
Read the case study
AI front desk GoHighLevel snapshot a US platform resells to home-service businesses
Case study 08

AI front desk GoHighLevel snapshot a US platform resells to home-service businesses

26 workflows live on the first client
~1 hr to deploy the next client
25 s from missed call to text-back
Read the case study

In our clients’ own words

Two clients, on camera, unscripted. No editing tricks.

On camera · July 2026
Spencer Cox
Spencer Cox
COO, Land AI and Liberty Acres

A year of working together, in his own words: attention to detail, follow-through on finishing projects, and honest communication. Unscripted, uncut from the point he starts talking.

On camera · September 2026
Vasili Kastashchuk
Vasili Kastashchuk
Owner, Fresh Start Health Retreat

A full Keap-to-GoHighLevel migration under a hard deadline, in his own words: API and backend leverage, deep systems work, honest scoping, and the automation builds that followed. Unscripted.

Verified 5-star Upwork review · July 2026
“Razi did excellent work building out our GHL + Make.com lead automation system. He was methodical and transparent throughout — everything was delivered in draft for my review, with detailed verification on every piece before anything went live, so I always knew exactly what I was approving. When he hit an architectural decision around data security, he flagged it and laid out options instead of just building past it, which I really appreciated. He also walked me through a live end-to-end test so I could confirm the whole system worked with my own eyes. Communication was clear and professional the entire time. I’d hire him again for future automation work.”
Jose T.
Home care agency, Florida
Lead automation · Senior home care, Florida
100%of milestones approved on first review

A lead-cadence engine that the client now audits by our standard

The situation

A Florida home care agency was buying referral leads that went cold: no systematic follow-up, no consent tracking on SMS, and a call-tracking integration that let junk calls into the CRM while blocking real ones.

The outcome

Three engagement batches delivered, every milestone approved on first review, most within 24 hours of starting. The client made our verification table his written standard for all future work.

What we built

  • 5 automated cadences built to exact spec, including a 90-day contact cadence and a 2-year long-term nurture pool
  • 43 SMS messages consent-gated across 13 live workflows for TCPA safety
  • CallRail-to-CRM lead filter rebuilt and verified read-only against 7 historical runs before going live
  • Every delivery shipped with a verification table: expected behavior next to actual behavior
AI Front Desk · Waste and home services, Alabama
~1 hourto deploy the system to each new client, instead of a rebuild

An AI front desk platform a US company now deploys to its own clients

The situation

A US home-services platform company needed a productized AI system it could roll out across service contractors: missed-call recovery, an AI agent that answers and qualifies, and human handoff that respects how a real crew works.

The outcome

All three Upwork milestones delivered between June and August 2026. The system went live on the platform's first client with 26 workflows and SMS approved on the first attempt, and the snapshot is what it deploys for each new contractor it signs.

What we built

  • Conversation AI agent that works identically on web chat and SMS, so it is tested live before carriers approve texting
  • Missed-call text-back firing in under 30 seconds
  • 3-tier human handoff: sales questions, dispatch and service issues, and owner-only matters each route differently
  • Reusable snapshot architecture: deploying the system to a new client takes about an hour, not a rebuild
Full funnel · Wellness brand, United Kingdom
1,500+members served by the program this system runs

18 months as the engineering arm behind a 1,500-member program

The situation

A UK wellness company selling an online program needed what most agencies quote a team for: a custom quiz app, a personalized sales funnel, subscription billing with trials, course delivery, and humane cancel and refund flows.

The outcome

An 18-month engagement across four separate contracts, all five-star reviewed, supporting a program serving 1,500+ members.

What we built

  • Custom React quiz app that scores visitors and routes each to a personalized sales page
  • 3-variant funnel in GoHighLevel: separate sales pages, order forms, and course versions per quiz outcome
  • Stripe subscriptions with 7-day trials, a one-click lifetime upgrade, and automated refund logic
  • Drip-unlocked trial courses and an 8-stage automated pipeline from quiz to completion

Every review, verifiable word for word

Every review is public and verifiable on our Upwork profile, word for word. We do not edit, combine, or invent testimonials. Ever.

Want your system built like this?

Start with the Free First Look, or bring your project to a 15-minute call.

Book a free 15-minute call
Book a free callhello@olventra.comWhatsApp usHire us on Upwork