Hi, I'm Joshua Aguilar

A Senior Backend Engineer

 

Introduction

Overview

  • Dedicated and results-driven Senior Full-Stack Developer with 5+ years of experience designing and implementing scalable, secure, and high-performance systems across fintech, e-commerce, and AI-driven platforms.
  • Proficient in Python, Java, C# .NET, Node.js, and Go, with expertise in microservices architecture, GraphQL, gRPC, and event-driven systems. Strong background in cloud-native development across AWS and Azure, leveraging CI/CD pipelines for rapid, reliable delivery.
  • Hands-on experience with healthcare and financial compliance systems (HIPAA, PCI DSS), implementing secure authentication (OAuth2, JWT), encryption, and RBAC. Adept at building data pipelines, real-time monitoring, and optimizing high-throughput services to handle thousands of transactions per second.
  • Recognized as a collaborative team player and mentor, bridging developers, data engineers, and business stakeholders to deliver impactful solutions. Passionate about applying cutting-edge technologies to solve complex problems and drive measurable business outcomes.
Software Architect

Software Architect

Technical Project Manager

Technical Project Manager

DevOps Engineer

DevOps Engineer

AI & Automation Specialist

AI & Automation Specialist

 

backend

Python (Django, Flask, FastAPI)
Node.js (TypeScript, JavaScript, Express.js)
Apache Kafka
Java (Spring Boot)
PHP (Laravel, CodeIgniter)
C# (ASP.NET)
Go (Golang)
gRPC
NestJS

frontend

React.js
Next.js
Angular
Vue.js
React Native
Tailwind CSS
MUI
JavaScript
HTML
CSS

cloud

AWS (EC2, Lambda, S3, CloudWatch, ECS, Fargate)
Google Firebase
Azure DevOps
Docker
Kubernetes
Jenkins
GitHub Actions
CI/CD
Terraform
Helm

data

PostgreSQL
MySQL
MongoDB
Redis
DynamoDB
CassandraDB
Elasticsearch
Snowflake
BigQuery

api

REST APIs
GraphQL
gRPC
JWT/OAuth2 Authentication
WebSockets
WebRTC
OpenAPI
Swagger
 

What I have done so far

Professional Experience

CLOUDSYNC TECHNOLOGIES

Senior Backend Engineer

CLOUDSYNC TECHNOLOGIES

  • Key Highlight: Built the automated validation engine that reduced manual review by 75% and became the core workflow for all client implementations.
  • Built backend services using Python (FastAPI, Django) and Node.js for document ingestion, parsing, validation, and workflow automation; added asynchronous processing with RabbitMQ and cloud queues.
  • Developed and improved ETL pipelines using Azure Data Factory and Azure Functions to process tax documents accurately and efficiently.
  • Implemented event-streaming pipelines for transaction monitoring and fraud scoring, cutting detection time from 5 minutes to under 10 seconds.
  • Set up CI/CD pipelines with Azure DevOps and Jenkins, using containerized workflows to speed up deployments and cut release errors by 60%; added monitoring with Azure Monitor, Datadog, and Prometheus.
  • Worked with product and QA teams using Jira for sprint planning and delivery.
  • Most proud of: Building the core fraud analysis engine that now powers every transaction check in production — a system that directly prevents financial losses daily.
May 2024 - Oct 2025
SENSETIME

Senior Backend Engineer

SENSETIME

  • Key Highlight: Built the core fraud analysis engine that powers all production transaction checks and prevents daily financial losses.
  • Designed and built backend systems for the NovaPay Fraud Detection Platform using Java 17, Spring Boot, and Kafka, supporting over 2M events per day with sub-100ms processing.
  • Created real-time event pipelines for transaction scoring, reducing fraud detection time from 5 minutes to under 10 seconds.
  • Developed a secure REST/gRPC API that integrated with banking partners and internal AI models for continuous fraud prediction.
  • Automated deployments via Jenkins + Terraform, reducing release time by 70% while improving reliability.
Nov 2022 - Feb 2024
EXIST SOFTWARE LABS

Full Stack Engineer

EXIST SOFTWARE LABS

  • Key Highlight: Designed the platformʼs real-time messaging backbone, forming the core event-processing layer used by all enterprise clients for shipment tracking and operational visibility.
  • Led backend development for the ShipFlow Logistics Platform, designing the full Django + React architecture and delivering scalable, reliable connections between realtime shipment data and enterprise dashboards.
  • Built and maintained high-volume asynchronous workflows using RabbitMQ, supporting 70K+ shipment updates/day with low latency and stable system performance.
  • Developed geo-tracking, predictive routing, and delivery analytics modules using AWS Lambda, DynamoDB, and serverless patterns, helping reduce client delivery times and fuel consumption by 18%.
  • Improved platform performance through API optimization, database tuning, and frontend performance improvements, achieving a 35% faster load time and increasing overall user satisfaction.
  • • Drove CI/CD modernization using GitHub Actions, Docker, and infrastructure-as-code, enabling faster, more reliable releases and better environment consistency across development, staging, and production.
May 2017 - Oct 2022
SYTIAN IT PRODUCTIONS INC

Software Engineer

SYTIAN IT PRODUCTIONS INC

  • Assisted in building ETL pipelines using Azure Data Factory and Databricks, helping integrate data from ERP, CRM, and HR systems into unified workflows.
  • Supported the development of financial and operational reports using Power BI, enabling teams to view updated metrics and business data more easily.
  • Performed data validation, testing, and documentation, ensuring pipeline accuracy, clean data flows, and consistent reporting for internal teams.
Jun 2016 - Apr 2017
 

My work

Projects

Following projects showcases my skills and experience through real-world examples of my work. Each project is briefly described with links to code repositories and live demos in it. It reflects my ability to solve complex problems, work with different technologies, and manage projects effectively.

project_image
source code

HealthTap – Virtual Primary Care Platform

Developed a responsive and secure healthcare platform that enables patients to connect with doctors and access personalized care. Focused on performance, accessibility, and HIPAA-compliant design.

#React

#MUI

#Django

#AWS

project_image
source code

Sierra Structures – Commercial Website

Built a user-friendly website for a leading fencing and structures company, featuring interactive service pages, lead generation forms, and a clean design for improved customer engagement.

#ASP.NET

#DynamoDB

#Angular

project_image
source code

Chirayu Hospital – Multispeciality Hospital

Designed and developed a modern hospital website to showcase medical services, departments, and facilities. Throughout the development, focused on ease of navigation, patient trust, and accessibility.

#Next

#Tailwind CSS

project_image
source code

eToro – Social Trading & Investment Platform

Contributed to building a scalable trading platform supporting stocks, crypto, and ETFs. Implemented secure APIs and optimized performance to ensure a smooth trading experience for millions of users globally.

#React

#Node.js

#GraphQL

#AWS

project_image
source code

RangeTrainer – Golf Practice & Improvement

Developed a specialized sports web app that helps golfers improve practice sessions through structured training plans, progress tracking, and interactive drills. Delivered a sleek UI with mobile-first design.

#Next.js

#Tailwind

#Firebase

project_image
source code

Toyota Lipa – Automotive Dealership Website

Built a responsive dealership website to showcase Toyota’s latest models, promotions, and customer services. Integrated booking features and optimized for local SEO to attract new buyers.

#WordPress

#BootStrap

#PHP

#MySQL

 

Get in Touch

Contact.