Backend Software Engineer

Josue de Santos

I design and build the systems behind the product — APIs, integrations, and data layers that stay reliable under real-world load. Based in Guadalajara, Mexico, with 3+ years of professional backend experience across Node.js, TypeScript, and Python.

Get in touch Resume

00 — Capabilities

What I work on

What 3+ years of cloud backend development and system design have actually built up — accumulated over a range of projects rather than any single one.

API & service design. REST and SOAP services in TypeScript/Node.js and Python — Django and Flask APIs hosted in both Azure and AWS powering web and mobile clients, and the services behind a loyalty platform sustaining 1.4M registered users and 60+ requests per second for 480k+ daily users. Third-party integrations against Salesforce through a middlware, and authentication flows built to banking standards with JWT lifecycle management and OTP.
Data & infrastructure. PostgreSQL and MySQL schema design with ORM-backed access, on cloud infrastructure across Azure and AWS. Caching strategy where it earns its keep — a Redis layer that cut third-party API consumption by 53% and response times by 42%, saving over 800,000 calls a day.
Reliability & operations. CI/CD pipelines on Azure DevOps and GitHub Actions, with automated unit, integration, and deployment testing inside an Agile/SCRUM workflow. 99.9% uptime in production, including a full platform migration delivered with zero downtime.

01 — Experience

Where I've worked

Oct 2024 — Present

Azure Backend Software Developer · Kiosko

Lead backend development of the Loyalty Program, serving 480k+ daily users at 60+ req/s with 99.9% uptime.
Engineered a Redis caching layer that cut Salesforce API consumption by 53% and response times by 42% — over 800k API calls saved per day.
Architected Salesforce integrations and a dual migration strategy running legacy and new platforms in parallel behind a custom interface, with zero downtime.
Implemented JWT lifecycle and OTP authentication flows to banking standards for the Loyalty Wallet app, integrated with a debit card SDK.
Built CI/CD pipelines on Azure DevOps and GitHub Actions and mentored peers while delivering reliable releases under pressure.

Node.js
TypeScript
Azure
PostgreSQL
Redis
Salesforce

Apr 2023 — Oct 2024

Cloud-Based Backend Software Developer · iNBest

Managed cloud infrastructure across AWS and Azure, deploying backend services for high availability.
Developed RESTful APIs and SOAP endpoints powering web and mobile client integrations.
Designed PostgreSQL and MySQL schemas with ORM-backed data access, documenting architecture through flowcharts and ER diagrams.
Automated unit, integration, and deployment testing within an Agile/SCRUM workflow to hold code quality as the system scaled.

Python
Django
Flask
AWS
Azure
PostgreSQL
MySQL

Jun 2022 — Mar 2023

Technical Support Specialist · Nextiva

Help desk and IT support for VoIP and network issues, including DHCP/DNAT troubleshooting and hardware provisioning.

VoIP
Networking
Salesforce
Linux

02 — Selected work

Projects

Kiosko

Loyalty Program Platform

Backend for a nationwide retail loyalty program serving 480k+ daily users at 50+ requests per second with 99.9% uptime.

Node.js
TypeScript
Azure
PostgreSQL
Redis
Salesforce

Live ↗

Kiosko

Salesforce Caching Layer

A Redis caching strategy that cut Salesforce API consumption by 53% and response times by 42% — over 800,000 API calls saved per day.

Redis
Node.js
TypeScript
Salesforce API
Azure

Kiosko

Loyalty Wallet Authentication

JWT lifecycle and OTP authentication flows built to banking standards for a wallet app integrated with a debit card SDK.

Node.js
TypeScript
JWT
OTP
Azure

All projects →

03 — Toolkit

Skills

Languages: Python
TypeScript
JavaScript
SQL
Java
Frameworks: Node.js
Django
Flask
Express
SQLAlchemy
GraphQL
Pandas
Data: PostgreSQL
MySQL
MongoDB
Redis
Cloud & DevOps: Azure
AWS
Docker
CI/CD
GitHub Actions
Serverless
Microservices
Practices: OOP
SOLID
Design patterns
Agile/SCRUM
Linux
Git

Back-End Engineer, Professional Certification Codecademy
CS50: Introduction to Computer Science Harvard University

04 — Teaching

CS50 in Spanish

Knowledge compounds when it's shared. I taught Harvard's CS50x one-on-one in Spanish — a language the course isn't offered in — documented every session, and published it for free on YouTube.

Watch the lectures →

05 — Contact

Let's connect

Whether it's backend architecture, an interesting problem, or teaching — I'd love to hear from you at contact@josueds.me.