Software Engineer

Specialized in designing and building robust .NET APIs, modular backends, and development tools focused on operational efficiency and maintainability of production systems.

Design and deployment of high-performance production .NET APIs and services.

Optimization of persistence and relational data models using EF Core and Dapper.

Implementation of advanced CI/CD pipelines with GitHub Actions and Docker containerization.

Development of professional-grade open source libraries and tools published on NuGet/PyPI.

Duitama, Boyacá · Colombia
Available for hire
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About Me

Profile
Modular design
Systems built for long-term maintainability
Quality & Stability
Production incident resolution and optimization
Leadership & Mentoring
Code reviews, standards, and team support

I am a backend engineer specializing in .NET and C#, focused on building APIs, modular backends, and clean architecture. I deliver reliable systems, resolve production incidents, and improve performance through incremental, well-structured changes.

I care about maintainability, modularity, and clear design over just 'shipping' code. I have experience leading technical teams, performing code reviews, and establishing architectural standards. I automate workflows with CI/CD (GitHub Actions + Docker) and use AI-assisted tools for support, while always maintaining full responsibility for system design and validation.

Clean Architecture
Backend Systems
.NET & C#
Systems Design
Technical Lead

Skills

Experience applied in production

Backend (.NET)

C#

4+ years

.NET 8 / .NET Core

4+ years

ASP.NET Core (Web APIs)

3+ years

Testing (xUnit)

3+ years

REST APIs

4+ years

Entity Framework Core

4+ years

Dapper

2+ years

Data (SQL)

SQL

4+ years

DevOps & Tooling

Git

4+ years

GitHub Actions / CI/CD

3+ years

Docker

3+ years

Azure DevOps / Azure

3+ years

AWS

2+ years

Also Used

TypeScript

3+ years

React

3+ years

Next.js

3+ years

Python

4+ years

PHP

3+ years

Languages

Communication level

Spanish
Native
English
B2

Featured Projects

Html2Pdf
.NET library for robust HTML-to-PDF generation: RazorLight-based template engine with PuppeteerSharp and browser pooling for high-performance reporting.
.NET 8
C#
RazorLight
PuppeteerSharp
Pooling
Performance
DI-ready
Integration
SimpleMediator
Lightweight and decoupled Mediator/CQRS pattern implementation for .NET. Optimized to reduce cognitive load and boilerplate in modular architectures.
.NET 8
C#
Zero
Dependencies
CQRS
Focus

Recent works and tools

Systems and libraries built with clean architecture principles and ready for production.

Flask Forge CLI
Automation tool for bootstrapping structured Flask projects. Facilitates the adoption of organized patterns, migration management, and standardized configuration.
Python
Flask
Typer
Jinja2
SQLAlchemy
Alembic
Scaffold
Delivery
Modular
Architecture
Vanilla SPA
Reference architecture for zero-dependency Single Page Applications. Implements native routing, state management, and component composition.
JavaScript
HTML
CSS
Vite
ES Modules
Zero
Dependencies
Native
Platform
light-query
React hooks for structured data management and simplification of API communication flows, focused on improving developer experience.
React
TypeScript
NPM
High
DX
Frontend
Usage

Other Projects

mini-php-framework
Experimental PHP micro-framework integrating routing, middleware, and SQLite persistence under a lightweight and documented structure.
MicroEngine
C# research project focused on modular system design and exploration of component-based architectures and resource management.
React Clean Architecture
Base template for React applications that promotes separation of concerns and decoupling of business logic from the UI.

Work Experience

Research & Development logo
Independent Backend Engineer (.NET)
Research & DevelopmentDuitama, Boyacá
2025 – Present
Remote
  • Development and maintenance of .NET APIs and services, prioritizing operational stability and iterative delivery.
  • Automation of deployment flows and versioning practices to ensure consistency in distributed libraries.
Tobiro SAS logo
Software Engineer (.NET)
Tobiro SASMedellín, Antioquia
2025
Remote
  • Development of .NET 8 backend services and technical components for a high-demand enterprise retail ecosystem.
  • Design of secure authentication flows using AWS SNS and integration of optimized SQL Server persistence.
  • Implementation of deployment automation and software update cycles using GitHub Actions.
EnterNova SAS logo
Backend Engineer (.NET)
EnterNova SASBogotá, DC
2024 – 2025
Remote
  • Construction and technical support of critical .NET and SQL Server-based services with a focus on high availability.
  • Data performance optimization and business logic refactoring to improve system scalability.
  • Collaboration in defining technical standards and code reviews focused on software quality.
CEA JMontoya, TulipannStore logo
Full Stack / Backend Developer (Consulting)
CEA JMontoya, TulipannStoreVillavicencio, Meta
2022 – 2024
Remote
  • Delivery of administrative modules, e-commerce platforms, and internal systems on demand.
  • Relational data modeling and implementation of robust APIs to ensure successful integrations.
  • Corrective maintenance and ongoing technical support for integrated platforms.

Let's work together

If you're looking for someone to design and build clear, maintainable backend systems in .NET, I'd be happy to talk. You can reach me by email or through LinkedIn.

LinkedInGitHub
Kevin Santiago Martinez - Software Engineer | Portfolio