Oscar Verdugo

Work order No.0001

Name: Oscar Verdugo
Role: Senior Full-Stack Engineer
Based in: Tijuana, MX · remote for US teams
Availability: Open to B2B contract roles

I start products from zero and ship them to production: multi-tenant SaaS, CRMs and AI voice agents for service businesses. The work is attached below.

Attached photos · click any photo to enlarge

AI voice receptionists

Work order No.0002

Client: AbramProService · Callisto
Dates: 2025 – present
Stack: Node.js · Express · PostgreSQL · OpenAI · Retell AI · Twilio Voice
Role: Founding Software Engineer · only engineer on a founding team of 4

Work performed

Built Callisto, a platform of AI receptionists that answer the phone for service businesses, fully configurable from the platform.
They take calls that would have gone to voicemail, on weekends and after hours, book appointments and give quotes.
Built for HVAC, lawn care, beauty salons (nails, hair, makeup) and house cleaning businesses.

Result

+20% bookings by recovering the 40% of all calls that went to voicemail.

Active

Multi-tenant CRM, quote forms and landing pages

Work order No.0003

Client: AbramProService · CRM and web
Dates: 2025 – present
Stack: Angular · Next.js · Node.js · Express · PostgreSQL · AWS
Role: Founding Software Engineer · the one engineer, working with two industry operators and an operations generalist

Work performed

Multi-tenant CRM serving 20+ businesses, with embeddable quote forms.
SEO landing pages in Next.js.
Unit tests in Jest covering 80% of endpoints, critical ones first. Automatic deploys with GitHub Actions and periodic backups.

Result

150+ leads per month per client through the quote forms.
About 50% more organic traffic and leads in under a month.
99.9% uptime. Each deploy takes the site down for only 10–15 seconds.

Active

Multi-tenant SaaS for cleaning companies

Work order No.0004

Client: The Cleaning Software
Dates: 2023 – 2025
Stack: Angular · Node.js · Express · TypeScript · PostgreSQL · Redis · AWS
Role: Lead Full-Stack Engineer · worked with business leaders (not programmers) and one junior developer

Work performed

Designed and built a SaaS with a shared PostgreSQL database and isolation per tenant_id.
Built route planning for crews and tuned the slowest queries and screens with Redis and query optimization.
Tests in Jest and a Next.js landing page.

Result

30+ companies and 10,000+ cleanings per month.
40% less drive time, with fewer miles, and 5 hours a week saved building routes.
Tips up 25%.
Long queries from 10–20 s to 500–900 ms. Frequent screens from 4 s to 200 ms.

Completed

Private codebase, no screenshots on file.

Landing page, admin platform and cleaner app

Work order No.0005

Client: Silvia's · house cleaning in Austin, TX
Dates: Ongoing
Stack: Next.js · Angular · Node.js · Express · PostgreSQL
Role: Technical lead

Work performed

Built the three pieces a cleaning company runs on: a booking landing page with instant price range, an admin platform for scheduling, crews, customers and marketing, and an app for the cleaners.

Active

Website with online payments, client app and admin tool

Work order No.0006

Client: UMOW · lawn care in Austin, TX
Dates: 2022 – 2023
Stack: Next.js · Node.js · Stripe · Google Maps API · AWS
Role: Full-stack developer

Work performed

Built the Next.js website with online payments, the client app to request and track service, and an internal admin tool with a dispatch map and price configuration.

Result

200+ recurring clients.

Completed

Earlier jobs

Work order No.0007

Auditoría Superior del Estado de Sinaloa

Sep 2020 – Mar 2022

Coordinated 2 junior developers. Built 3 internal apps used by about 400 people, a face-recognition attendance system in Python used by 300+ employees, and real-time dashboards with Socket.IO.

Jawa · flavored water producer and distributor

2018 – 2020, part time

Built a delivery routing system. 35% fewer losses across a fleet of 10 drivers.

Education

Software Engineering, Universidad Autónoma de Occidente, 2017–2021

Tools of the trade

Front end

React, Next.js

Back end and data

Python, PostgreSQL, Redis, Socket.IO

Quality and delivery

Jest, GitHub Actions

AI and voice

LLMs, Retell AI, Twilio

Next job

Work order No.0008

Need a senior engineer who can take a product from zero to production? Send the order.

Email LinkedIn CV in English CV in Spanish

Request