Alexander Valencia

Backend Developer

Passionate backend developer with frontend experience, specializing in scalable systems, clean code practices, and modern web technologies. I build robust applications that solve real-world problems.

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Work Experience

Professional journey showcasing my expertise in backend development and system architecture.

Blossom

Backend Developer

2 years, 4 months

Developed online banking software using cutting-edge technologies, including Node.js, GraphQL, and PostgreSQL. Proficient in crafting complex database queries and optimizing them to enhance performance. Expertise in utilizing the Sequelize ORM for efficient data management.

  • Developed secure online banking software with advanced security protocols
  • Optimized complex database queries improving performance by 35%
  • Implemented GraphQL APIs for efficient data retrieval and management
  • Node.js
  • GraphQL
  • MongoDB
  • PostgreSQL
  • Sequelize

HelloBuild

Full Stack Developer

1 year, 7 months

Collaborated on projects for clients such as Identifee and Homecu, facilitating the development of scalable platforms. Utilized technologies including Node.js, React.js, CSS, and SQL databases (specifically PostgreSQL). Proficient in handling queries and ORM tools like Sequelize. Proficient in API development and experienced in utilizing GraphQL for efficient data retrieval.

  • Developed scalable platforms for major clients including Identifee and Homecu
  • Built responsive frontend interfaces with modern React.js practices
  • Implemented efficient GraphQL APIs for optimal data retrieval
  • Node.js
  • React
  • CSS
  • GraphQL
  • SQL
  • PostgreSQL
  • Sequelize

Fluvip

Full Stack Developer

6 months

Contributed to the development of a platform connecting brands with top social media influencers across various platforms (Twitter, Facebook, Instagram, YouTube, Vine, and Snapchat). Primarily focused on React.js and Node.js development, leveraging AWS services like CodePipeline and Lambda to build a robust platform for seamless brand-influencer collaboration.

  • Built influencer-brand connection platform supporting multiple social media platforms
  • Implemented AWS serverless architecture with Lambda and CodePipeline
  • Facilitated seamless collaboration between brands and social media influencers
  • Node.js
  • Express
  • MongoDB
  • React
  • CSS
  • AWS
  • Lambda
  • CodePipeline

Atlanticsoft

Backend Developer

2 years, 1 month

Developed a Google Chrome extension to automate dropshipping processes for major e-commerce platforms such as Amazon, eBay, and Best Buy. Successfully processed thousands of orders within minutes. Utilized technologies including Node.js, Python, and AWS services such as Lambda, ECS, and queues to streamline and enhance the dropshipping workflow.

  • Developed Chrome extension automating dropshipping for major e-commerce platforms
  • Successfully processed thousands of orders within minutes using automated systems
  • Implemented scalable AWS architecture with Lambda, ECS, and queue services
  • Node.js
  • Python
  • AWS
  • Lambda
  • ECS
  • Chrome Extension

Personal Projects

A showcase of my personal projects demonstrating various technologies and problem-solving approaches.

Calculadora del 4x1000 preview

Calculadora del 4x1000

Code Live Demo

Financial calculator for Colombia's 4x1000 tax. A web application that helps users calculate the financial transaction tax (4 per thousand) with an intuitive interface and accurate calculations.

Built with:

  • HTML
  • CSS
  • JavaScript
  • Responsive Design
Hub de Calculadoras preview

Hub de Calculadoras

Code Live Demo

A collection of over 20 free calculation tools, organized to support everyday tasks.

Built with:

  • HTML
  • CSS
  • JavaScript
  • Responsive Design