Hi, I'm Efrain —
a Full-Stack Software Engineer

Legal practice-management SaaS — full-stack features and deep Microsoft Graph integrations.

• Deliver full-stack features across a React/TypeScript (MUI) front end and .NET/C# services on SQL Server, with deep Microsoft Graph integrations (SharePoint, Planner).
• Led the port of legacy AdminTool modules into the modern stack, including a real-time Server Monitor built on JWT session IDs, custom request middleware and SignalR live updates.
• Designed and shipped Chained Events automation that provisions Microsoft Planner tasks and calendar appointments from configurable templates via delegated OAuth and per-tenant provisioning.
• Root-caused high-impact document-management bugs in SharePoint-backed storage — eliminating folder-provisioning failures on name collisions and fixing Word add-in save errors by keying resolution off stable drive identifiers.

• React
• TypeScript
• MUI
• .NET / C#
• SQL Server
• Microsoft Graph
• SignalR
• Auth0

Technical lead for a scalable, multi-tenant SaaS platform.

• Led the development and deployment of a scalable, multi-tenant SaaS platform, aligning a designer, frontend and backend team with business goals.
• Designed and deployed the multi-tenant application on Azure with Terraform for scalability and operational efficiency.
• Architected the backend on .NET 8 using Clean Architecture and Domain-Driven Design for high performance and adaptability.

• .NET 8
• Angular
• Azure
• Terraform
• PostgreSQL
• GitHub Actions

Healthcare-tech platform — performance, HIPAA-compliant security, cloud infrastructure and AI tooling for skin-cancer detection.

• Led technical work to optimize response times across web apps, APIs and desktop applications, improving user satisfaction.
• Integrated AWS Cognito with a .NET application for authentication and authorization, ensuring HIPAA compliance.
• Designed AWS pipelines to process images for potential signs of skin cancer, and built a platform empowering doctors to train predictive AI models for skin-cancer detection.
• Designed and implemented cloud infrastructure for a grant-matcher platform on Azure using Bicep for secure, efficient resource management.
• Consolidated four divergent database schema lineages into a single Entity Framework migration path on MySQL, eliminating cross-environment drift.
• Moved API configuration into AWS SSM Parameter Store and Secrets Manager and fixed GitHub Actions release workflows — removing hard-coded secrets across 20 environments and enabling hands-off releases.

• .NET Core
• Vue.js
• React
• AWS
• AWS Cognito
• Azure / Bicep
• MySQL
• GitHub Actions

Performance, data and AI features for a sales analytics product.

• Enhanced application architecture for performance and scalability, and mentored the team on domain-driven approaches.
• Built a responsive map module visualizing car-sales data by region for real-time insight.
• Led integration of ChatGPT and Snowflake to improve call-scripting and extract market insights that reduced marketing cost.

• Node.js
• Angular
• AWS
• MongoDB
• Snowflake
• Redis
• WebSockets

Architected a robust, highly scalable multi-tenant e-commerce platform.

• Implemented a logging library on Serilog + Elasticsearch/Kibana, improving production debugging.
• Built a gRPC library for efficient inter-service communication between microservices.
• Applied SOLID, Clean Code and DDD to deliver maintainable microservices, including an Identity Service on .NET Core + Angular.

• .NET Core
• Identity Server
• gRPC
• RabbitMQ
• MongoDB
• Elasticsearch
• Angular

Features, alerts and deployment tooling for an Electron desktop system.

• Developed and integrated new features into an Electron/Node.js/TypeScript system, improving performance.
• Enhanced deployment scripts for a more robust, efficient Electron installer.
• Built an in-app alert system and UI screens in Vue.js + TypeScript to UX guidelines.

• Electron
• Node.js
• TypeScript
• Vue.js
• Linux
• Jenkins
• C/C++

Rearchitected an oil & gas inventory system and mentored engineers.

• Designed the architecture of a desktop inventory application — reliable, scalable and maintainable.
• Built a Power BI web service exposing database data via Node.js + TypeScript + MongoDB.
• Implemented a logger and new features for embedded software using C#, WPF, SQL Server and C/C++.

• .NET Framework
• C#
• WPF
• Node.js
• React
• MongoDB
• SQL Server

CAM software, low-level C/C++ libraries and web tooling for PCB design.

• Converted assembler to C and built libraries supporting 32- and 64-bit architectures, improving efficiency.
• Built a Linux C++ application capturing camera video on an AM4378 board for faster, more accurate processing.
• Developed a node-gyp plugin wrapping a C library and a web app to view PCB designs and detect errors.

• C / C++
• Ruby on Rails
• Node.js
• node-gyp
• .NET Framework
• Three.js
• Assembler