Custom Software Development

Off-the-shelf tools bend your business to their limits. I build custom Twilio and AI-powered software around the way you actually work.

Custom Software Development Services

Generic platforms get you to 80% and leave the expensive 20% unsolved. I design and build custom software for communication-heavy businesses: Twilio-based messaging and voice systems, AI integrations, and the APIs that connect them to the tools you already run. You own the code, the data, and the roadmap.

Discovery & architecture

We map the workflows that need software, define the scope that pays for itself first, and design an architecture that fits your existing stack instead of replacing it.

Development & integrations

I build the system with Laravel, Python, and the APIs it needs to talk to: Twilio, WhatsApp Business, OpenAI, your CRM. Short cycles, working software at every step.

Launch & iteration

Deployment, monitoring, and documentation your team can maintain. Then we iterate on what production data says, not on assumptions.

Author

About

I'm a Senior Software & AI Engineer with 7+ years of experience building communication systems and the platforms around them, on Twilio, Laravel, Python and n8n.

Most of my work is for US-based companies whose operations run on calls and messages: a Twilio Flex contact center for an agency's client, a whitelabel WhatsApp platform other agencies resell, and a law firm CRM that holds up under 500 concurrent users.

I don't build demos. I build systems that run when someone picks up the phone.

Solutions that I provide for your business

From startups to established teams, I build the software your business actually needs: no licenses, no per-seat pricing, no waiting on someone else's roadmap.

Custom Twilio Development by Gonzalo Gomez

Custom Twilio Development

Messaging and voice systems built on Twilio to your exact requirements: campaign platforms, call routing, WhatsApp flows, and A2P-compliant SMS at scale.

Custom AI Integrations by Gonzalo Gomez

Custom AI Integrations

LLM-powered features embedded in your real workflows: WhatsApp assistants, voice agents, document processing, and automations with human handoff where it matters.

Communication Platforms by Gonzalo Gomez

Communication Platforms

Custom communication software that unifies SMS, WhatsApp, voice, and email into one system your team controls, with the reporting your operation needs.

Custom APIs & Third-party Integrations by Gonzalo Gomez

Custom APIs & Third-party Integrations

RESTful APIs and integrations that connect your CRM, billing, calendars, and internal tools so data flows without manual re-entry.

Internal Tools & Dashboards by Gonzalo Gomez

Internal Tools & Dashboards

Operator dashboards, admin panels, and reporting tools tailored to how your team works, replacing the spreadsheet glue that breaks under volume.

Modernization & Automation by Gonzalo Gomez

Modernization & Automation

I take over legacy systems, stabilize them, and automate the manual steps around them, so the software your business depends on stops being a risk.

Work already running in production

Production · Law firm CRM

A Los Angeles law firm running its whole intake on tools that were never built to talk to each other.

They needed to handle heavy call volume and book appointments across multiple offices without things falling through the cracks. I built the platform from scratch and kept building it as the firm grew.

It started as call handling and scheduling and turned into a full CRM. Calls through Twilio, recordings pulled by OnSIP into AWS so managers can review them, appointments syncing both ways with Google Calendar and Outlook, real-time updates through Pusher, client files and multi-location scheduling in one place.

The part that matters: it holds up under 500 concurrent users and 20-plus background jobs running at once. This is not a prototype. It is production infrastructure a law firm has trusted and kept expanding for over a year.

Read the case study →
Twilio Flex · Contact center

An agency hired me to build the Twilio Flex contact center one of their clients was counting on.

The setup was a mess. Agents had no history on incoming calls, so they had no idea who they were talking to. Unanswered calls just vanished and nobody got called back. And the same contact would open three or four duplicate tasks at once. None of that scales, and the agency's client was feeling it.

I rebuilt it into a real omnichannel contact center inside Flex. Custom plugin so the agent sees every past call and message the second a new one lands. Smart routing through Studio and Functions: if nobody answers in 20 seconds, the call drops into an automated voicemail flow instead of disappearing. TaskRouter logic so one contact never opens more than one active task. Even a custom ringtone so agents don't miss calls when the browser tab isn't focused.

What changed:

  • ✓100% of missed calls captured (they used to just disappear)
  • ✓Conversations resolved 30 to 40% faster, with full context on screen
  • ✓Zero duplicate tasks, even in the bursty hours
"Gonzalo was truly exceptional. He went above and beyond to get things done. We boosted customer satisfaction by 45%." -- Jesse Fowler, CEO, OSC Web Design
Read the case study →

Most recent projects

WhatsApp AI Assistant with Memory, Tools, and Calendar Integration

WhatsApp AI Assistant with Memory, Tools, and Calendar Integration

February 05, 2026
Category: AI Communication SystemsChannel: WhatsAppStack: Python, FastAPI, Twilio, OpenAI, LangChain, PostgreSQL, Google Calendar API The ProblemMost “WhatsApp AI assistants” fail for predictable reasons. They rely on:Static prompt... Read more
A Twilio Powered SMS Platform With Real Time Chat, Bulk Campaigns, and Contact Management

A Twilio Powered SMS Platform With Real Time Chat, Bulk Campaigns, and Contact Management

November 28, 2025
IntroductionOver the last few weeks I have been working on a lightweight but powerful messaging platform designed for agencies, SaaS teams, and businesses that want... Read more
Case Study: Twilio Flex Plugin and Smart Call Flow Development

Case Study: Twilio Flex Plugin and Smart Call Flow Development

May 07, 2025
IntroductionA client approached me with a critical need: to build a centralized communication interface within Twilio Flex — one that could manage incoming conversations, route... Read more
Implementing a Twilio Phone Number Integration for an Ecuador-Based Customer

Implementing a Twilio Phone Number Integration for an Ecuador-Based Customer

January 14, 2025
Case Study: Implementing a Twilio Phone Number Integration for an Ecuador-Based Customer  OverviewIn today’s world, businesses rely on seamless communication tools to enhance customer experience. Recently,... Read more
Case Study: Development of a Custom Call Center Platform for a Law Firm

Case Study: Development of a Custom Call Center Platform for a Law Firm

January 10, 2025
IntroductionThis case study presents the development of a custom-made call center platform for a prominent law firm located in Los Angeles. The platform was designed... Read more
Accounting Studio GS

Accounting Studio GS

September 01, 2024
Case Study: Website Redevelopment for an Accounting Studio IntroductionThis case study outlines the redevelopment of a website for an accounting studio that needed a modern, user-friendly,... Read more