Senior Software Engineer & Founder

Open to: Senior IC roles · Consulting · Software maintenance

Hi, I'm

Isaac Sanchez Aguilar

Senior Software Engineer & Founder

7+ years of experience at Google, Meta, and PayPal building products that reach billions of users — and currently launching my own SaaS for small businesses in Mexico. I like improving everything I touch: performance, costs, architecture, and the team’s developer experience.

7+
Years of experience: 3
Google · Meta · PayPal: 500+
Problems solved (UVa + Codeforces): 2026
Launching my own SaaS

Contact Download resume LinkedIn GitHub

About me

I improve everything I touch: performance, costs, architecture, and the team’s experience.

I am a Senior Software Engineer with 7+ years of experience building full-stack systems, internal developer tools, and high-impact products at Google, Meta, PayPal, and high-growth startups. I currently work on Google’s Marketing Engineering team, after spending over a year building compilers and developer tooling used by YouTube, Search, and Maps.

In parallel, I am building my own product: an all-in-one SaaS platform for small businesses in Mexico, launching in 2026. I see myself as someone who constantly improves whatever is around me — optimizing performance, reducing costs, proposing scalable and maintainable solutions, and raising the team’s developer experience. Long term, my goal is to keep growing as an IC toward Staff/Tech Lead while building my own software consultancy.

My technical foundation also comes from competitive programming: I was part of the ESCOM-IPN Algorithms Club for 4 years, with multiple appearances at the ICPC Mexico & Central America Grand Prix.

Experience

Dec 2024 – Present
Google

Software Engineer L4
Marketing Engineering

Jan 2026 – Present
- Own the full web development cycle of the internal tools that build all of Google’s public marketing pages, alongside a cross-functional team (engineering, design, and marketing).
- Built and launched the cookie consent bar used across Google’s public marketing properties, reaching billions of users worldwide.
- Work on accessibility, performance, and large-scale migrations over a vanilla JavaScript stack with internal rendering engines (EJS, Handlebars, and Google-proprietary technology).
- Participate in planning and decision-making on architecture, new modules, and migrations.
Compiler & Developer Tooling

Dec 2024 – Jan 2026
- Designed and implemented internal compilers and developer tooling for cross-platform languages, driving adoption of Google’s new technology to over 80% of the components in YouTube, Search, and Maps.
- Led the automation and analysis of iOS performance benchmarks.
- Collaborated directly with the YouTube, Search, and Maps teams; contributed to recruiting and onboarding new engineers.
Mar 2024 – Oct 2024
Blend

Software Engineer L4 · Lending Team (Contractor)

Blend powers the entire process of collecting, validating, and analyzing loan and mortgage applications for U.S. banks.
- Designed and implemented multiple loan product types across frontend and backend.
- Increased test coverage by 60% and optimized CI times by cleaning up unnecessary data and applying best practices.
- Delivered knowledge-sharing sessions on frontend best practices.
- Took part in on-call rotations for production systems.
May 2023 – Mar 2024
PayPal

Software Engineer L3 · Checkout Team
- Improved GraphQL server monitoring and transaction tracking, and standardized error handling, reducing false positives in checkout error detection.
- Recovered 50% of the functional tests that were broken.
- Led the migration of currency and amount handling in the checkout flow to new libraries, detecting and fixing resulting bugs.
- Took part in on-call rotations for the checkout platform.
Jan 2022 – May 2023
Luxoft

Software Engineer L3 · Client: Intermountain Healthcare
- Led the migration of 100% of the React Native router in the mobile app, with zero regressions.
- Designed the frontend architecture and led the planning and implementation of new modules on web (React) and mobile (React Native).
- Mentored a team of roughly 10 engineers through code reviews, pairing, and onboarding.
Apr 2021 – Jan 2022
ArteDigital Software Development

Software Engineer
- Built the entire Crediverso ecosystem from scratch as part of a team of 8 engineers and 2 product owners.
Sep 2020 – Apr 2021
Paxico Technologies

Software Engineer · Contractor
- Fixed Redis cache bugs and reduced the memory usage of a listing module by replacing a heavy virtual-DOM renderer with a sliding-window approach.
Jun 2020 – Sep 2020
Facebook (Meta)

Software Engineer Intern · Ads Team
- Built unit, integration, and end-to-end tests (Hack, JavaScript, Jest) for Facebook Ads flows.
- Developed internal models for detecting data mismatches.
- Found and fixed production bugs surfaced through this testing.
Nov 2019 – Jun 2020
Inmersys

Software Engineer · First formal job
- Co-built Bioderma’s internal system for managing promotions, sales, and distribution (mobile, web, and backend).

Additional experience — Archive 3 roles

Cookunity

Sep 2025 – Jan 2026

Senior Software Engineer · Freelance, in my free time

Side consulting project outside my full-time job: improved payment-system query performance by up to 80%, implemented observability with Datadog, and refactored legacy JavaScript modules to TypeScript with onboarding docs that cut ramp-up time by ~75%.

SmartThink

Aug – Nov 2024

Software Engineer · Freelance

Maintained and improved a school management platform; designed and implemented a new rental system.

Minted

Mar – Jul 2024

Software Engineer · Freelance

Rebuilt a legacy static-site generator for wedding invitations from scratch using React 19 and modern static-site tooling.

Ventures & Products

Founder

Launching Q3 2026

SaaS for small businesses in Mexico (name TBD)

All-in-one platform built solo for corner stores, grocery shops, restaurants, gyms, and local businesses: payments and debtor management, inventory, point of sale, an online store with no hidden fees, and automatic WhatsApp reminders/subscriptions. It also generates landing pages and online stores, with label and receipt printer integrations. Waitlist opens late July 2026; full launch in August 2026.

Astro
Cloudflare Workers
PostgreSQL
WhatsApp API

Creator

Active since 2019

Codeforces Ladders — A2OJ Progress Viewer

Training tool for the competitive programming community, with ~50 daily users from different countries. Search any Codeforces handle and track progress per ladder list and ranking. New version already finished: offline mode, new stats, accessibility/performance improvements, and React 19 — release coming soon.

React 19
TypeScript
Astro
Firebase

Site Codeforces post

Builder

In production

Liverpulga

Admin mobile app and auto-generated static store for my mom’s business, allowing her to update products, prices, and discounts from her phone. It will soon migrate to my SaaS inventory system at launch.

React Native
Astro
Cloudinary
Zustand

Content & Community

YouTube channel

Coming soon

Content on programming, algorithms, math, and physics — sharing technical experience and best practices with people starting out in software. Content already recorded, publishing soon.

Competitive programming

4 years in the ESCOM-IPN Algorithms Club, with multiple appearances at the ICPC Mexico & Central America Grand Prix.

518
Problems on UVa Online Judge: 264
Problems on Codeforces: 4
Years in the Algorithms Club

Technical skills

Languages

JavaScript
TypeScript
Python
C/C++
Go
Java
PHP
Swift

Frontend

React
Next.js
React Native
Astro
Svelte
Redux
Tailwind CSS
SASS

Backend

Node.js
NestJS
GraphQL
tRPC
gRPC
Django
Flask
Prisma ORM

Data & Infrastructure

MySQL
PostgreSQL
MongoDB
Redis
AWS
Docker
Airflow
Datadog

Tools & Practices

Git
GitHub
GitLab
Jenkins
Travis CI
Jest
Cypress
Playwright
Figma
Jira

Spoken languages

Spanish (native)
English (fluent — professional)

Honors

4th place (out of 24 teams), ESCOM Team — ICPC Mexico & Central America Grand Prix, 2019
28th place (out of 381 teams), ICPC Mexico & Central America Grand Prix, 2019
Selected participant, XII Caribbean Programming Camp for ICPC, 2019
National record, 2x2 Rubik’s Cube — 1.30 s single (official WCA profile)