Mauro Genna Full-Stack Engineer
Full-Stack Engineer · Founder

Mauro Genna

Full Stack Engineer shipping AI-powered SaaS products, from MVP to revenue — founder of Arnie.

I design and ship end-to-end systems — backend to frontend — with strong ownership over architecture, scalability, and revenue-critical features. Core contributor in small, high-autonomy teams building for US and EU markets.

Available for remote roles US / EU timezones EN · ES · IT
01Featured build
Arnie logo
Arnie
FOUNDER · 2026 → NOW

24/7 AI customer support for small and medium businesses.

Arnie answers customers across WhatsApp, voice, and web chat — so businesses that can't staff a round-the-clock team never miss a conversation. Built for local retailers, service businesses, and real-estate agencies across Latin America.

WhatsApp Voice Web chat
Built with
TypeScript NestJS Next.js PostgreSQL OpenAI Retell AI ElevenLabs
Arnie landing preview
Arnie — AI customer support landing page
02Case studies

Two revenue- and operations-critical systems, framed the way I think about them: problem, technical decision, result.

Case 01 · Software Engineer · Highpoint Growth Networks

Owning the billing data layer

US · AD-TECH SAAS
Problem

Billing and subscription data for Highpoint's customers lived entirely inside Hyfin's own application — Captiview had no direct ownership or visibility into that data. As the platform scaled, this became a growing dependency: critical customer records existed only in a third-party interface, disconnected from the product Captiview was actually building.

Technical decision

Architected an integration with Hyfin's API to individualize and centralize billing records directly inside Captiview, rather than relying on Hyfin's application as the source of truth. Hyfin remained the underlying payment processor, but Captiview took ownership of the data layer — syncing full billing history for every existing customer into Captiview's own database.

Result

~200 active subscriptions integrated over approximately 1.5 months, with continuity maintained throughout — no active subscription was disrupted. Captiview now owns and controls its subscription data instead of depending solely on Hyfin's interface.

Architecture
Hyfin stays the processor · Captiview owns the data
External
Hyfin
Payment processor
Integration
Hyfin API
API sync layer
Billing · owned
Captiview
NestJS billing layer
Datastore
MySQL
AWS-hosted
Case 02 · Full-Stack Engineer · UseTeam

Voice-AI incident automation

SPAIN · PROPTECH
Problem

Residents reported incidents primarily by phone, generating a high volume of calls that staff often couldn't keep up with — leading to missed or delayed responses and no consistent record of what had been reported or when.

Technical decision

Built a voice-automation pipeline on Retell AI, integrated with backend services to capture structured incident data from resident calls and automatically trigger downstream workflows — email, SMS, and admin processes.

Result

Automated incident intake end-to-end — every call is now logged with what was reported and when, without requiring a human to answer or transcribe it manually. Deployed across 50+ residential condominiums in Spain.

Architecture
Inbound call → structured, routed record
Input
Resident call
Inbound voice
Voice AI
Retell AI agent
Conversation + intent
Extract
Structured data
Incident record
Route
Automated workflow
Email · SMS · Backend
Aggregate impact

The production scale of the systems above.

1,500+
Venues served
Highpoint platform
1,100+
Active users
Highpoint platform
50+
Condominiums
UseTeam deployment
~200
Subs integrated
Highpoint billing migration
03Experience
JUN 2026 — PRESENT
Founder · Arnie

Building an always-on AI support platform — WhatsApp, voice, and web chat — for SMBs across Latin America. Product, architecture, and go-to-market.

APR 2025 — PRESENT · SPAIN
Full-Stack Engineer, AI · UseTeam

3-engineer squad shipping AI-powered MVPs for international clients — 5+ platforms from concept to production, including the voice-AI property assistant.

MAR 2024 — PRESENT · US
Software Engineer · Highpoint Growth Networks

Core engineer on a production ad-tech SaaS — 1,500+ venues, 1,100+ users, 250+ advertisers. Led the platform redesign and brought billing data in-house.

EDUCATION — Full-Stack Web Dev, Henry (2023) · Front-End, NextU (2022)
04Stack

The stack, layer by layer — from language and services up to the infrastructure it runs on.

01
Languages
Type & syntax
TypeScript JavaScript
02
Backend
Services & APIs
NestJS Node.js REST APIs Database Modeling Subscription Logic
03
Frontend
Client & UI
Next.js React Component Architecture State Management
04
Databases
Persistence
PostgreSQL MongoDB SQL & NoSQL
05
AI & Voice
Intelligence layer
OpenAI APIs Retell AI ElevenLabs AI Workflow Integration Voice Automation
06
Infra & Payments
Platform & billing
Railway Vercel Creem
05Contact

Let's build something that ships.

Evaluating a senior full-stack or founding engineer? Curious about Arnie for your business? Either way — I'd like to hear from you.

Open to work
Role Senior full-stack / founding engineer
Setup Full-time · remote
Markets US · EU timezones
Mauro Genna
Full-Stack Engineer · Founder
Title Built as a systems blueprint
Copyright © 2026 Mauro Genna
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