Jesus Santander

About

I am a full-stack developer with over 10 years of expertise in distributed computing, scalable architectures, cloud, and web applications.

Work Experience

Rollkall

Remote

Senior Software Engineer

Jan 2024 - Present

• Built responsive React components for the Officer Portal, enabling officers to access essential features on devices where mobile apps are restricted.
• Developed asp.net endpoints and SQL stored procedures to migrate the invoicing system, improving functionality and ensuring a smooth transition.
• Migrated the "Locations" screen in the Client Portal, addressing bugs and maintaining consistency across all the web portals.

Skills:

.NET

TypeScript

React

Azure

Laika

Remote

Senior Software Engineer

Oct 2022 - Jan 2024

• Developed the new pet registration flow in the React Native app, resulting in a 20% increase in the number of users who categorize their pets, enabling the marketing team to create more targeted email campaigns and in-app offer discounts.
• Contributed into the migration of a monolithic PHP application to a microservices (Node.js + Nest) architecture using Docker and AWS Fargate, reducing downtime and improving scalability.
• Improved the Algolia faceted search and auto-complete functionality, improving search accuracy and reducing response time.

Skills:

Node

TypeScript

React

AWS

Microsoft

Remote

Senior Software Engineer

Apr 2021 - Sep 2022

• Developed accessible React components using techniques like server-side rendering, and lazy-loading, contributing to reduction in page load time and increase in website accessibility score.
• Configured Azure Cognitive Search features like semantic ranking and synonym mapping to enhance text-based query precision within the application.
• Implemented Entity Framework Core optimizations, including disabling change tracking for read-only queries and minimizing lazy loading, streamlining data interactions and improving application performance.

Skills:

.NET

TypeScript

React

Azure

Alphas

Remote

Senior Software Engineer → Lead Software Engineer

Jun 2019 - Mar 2021

• Reduced data processing time by implementing a message queuing system with RabbitMQ, enabling parallel processing and optimizing resource utilization. This resulted in a 30% increase in processing capacity.
• Refactored a legacy system into a modern microservices architecture using Azure technologies like App Service, Storage, Service Bus, Functions, CosmosDB, and AD B2C. This migration boosted system performance, significantly reducing response times and enabling enhanced scalability.
• Transferred an ASP.NET API handling 500 concurrent requests peak from an on-premise VM to Azure App Service, achieving a 15% cost reduction and enhanced scalability through automatic scaling and load balancing.
• Secured data exchange with the Colombian tax department (DIAN) by configuring a WCF service. This involved implementing SSL encryption, user authentication, and access control mechanisms, ensuring adherence to strict data privacy regulations.

Skills:

.NET

TypeScript

React

Azure

Ferrisoft

Software Engineer

Jan 2018 - May 2019

• Optimized Entity Framework queries for a high-traffic WPF workstation application, resulting in performance improvement and a reduction in average response time. This was achieved by disabling change tracking for read-only operations, implementing query caching, and leveraging stored procedures for frequently used queries.

Skills:

.NET

Navicu

Software Engineer

Jan 2017 - Dec 2019

• Developed and customized Node.js BFFs (Backend for Frontend) for both web and mobile applications, tailoring API clients to their specific data and performance needs.
• Performed a MySQL database normalization, involving table splitting, foreign key creation, and data cleansing, which led to a reduction in data inconsistency.

Skills:

Node

Tecfenix

Software Engineer

Jan 2016 - Dec 2016

• Achieved a 20% throughput improvement by migrating a backend API from .NET Framework to .NET Core 1.1.
• Developed a QR code scanner in C# for the company warehouse management system using the ImageSharp library, streamlining product identification and inventory management.

Skills:

.NET

Education

University of Carabobo

MSc. Applied Mathematics

2022 - Present

University of Carabobo

B.Eng. Telecommunication Engineer

2010 - 2015

Certifications

Microsoft

Azure Developer - Associate

2023

Publications

Skills

Projects