Guillermo Cifre González

Backend Engineer | Platform Engineering

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About Me

Software Engineer with 3+ years building production systems in TypeScript and Node.js, with growing focus on Platform Engineering and cloud-native infrastructure. Proven track record introducing architectural patterns adopted as team best practices—including batch operations for database query optimization and external API call efficiency. Experience building REST APIs, GraphQL services, and Docker-based infrastructure. Actively building production-ready CLI tools in Go (Golang), with experience automating production deployments using Bash and AWS Systems Manager. Seeking Backend Go or Platform Engineer role to leverage backend expertise while deepening cloud-native and infrastructure skills.

Technical Skills

Backend

TypeScript, Node.js, Express.js, REST APIs, GraphQL, Go

Databases

PostgreSQL, MongoDB, MySQL

DevOps & Infrastructure

Docker, Docker Compose, Git, GitHub Actions, CI/CD, Bash scripting, AWS

Frontend

Vue.js (Vue 3, Composition API), Nuxt.js, React.js, Next.js, TypeScript

Testing & Quality

Jest, Vitest, Pytest, Unit Testing

Languages

Spanish (Native), English (B2 - Professional working proficiency)

Projects

env-manager-cli [In Progress - March 2026]

github.com/Willy93-coder/env-manager-cli

CLI tool in Go for managing .env files securely with PostgreSQL backend, solving real developer experience problems in multi-project environments.

Tech: Go, Cobra, PostgreSQL, Docker

Work experience

Software Developer - [14/04/2025 – Today]

Wozzo

  • Developed RESTful APIs from scratch using TypeScript and Node.js, implementing MVC architecture, API-Key authentication, and comprehensive OpenAPI/Swagger documentation
  • Implemented GraphQL schemas and resolvers with MongoDB data models, optimizing queries for performance
  • Introduced batch operations pattern to optimize database queries and external API calls, establishing best practice adopted across engineering team
  • Designed and implemented automated deployment script using Bash and AWS Systems Manager (SSM) for production backend deployments across multiple clients, handling Git operations, dependency installation, PM2 process management, and error logging
  • Built production AI Agent using OpenAI SDK with dynamic tool catalog, enabling contextual API integration based on runtime needs
  • Working with Docker Compose to manage multi-service infrastructure
  • Designed and implemented automated CI/CD pipeline using GitHub Actions and EAS Workflow for mobile deployments

Backend Developer - [01/02/2025 – 07/04/2025]

gasparaguilo.com

  • Designed and implemented comprehensive unit tests with Pytest, establishing testing standards for the project
  • Implemented authentication and authorization system using Flask-JWT
  • Refactored backend logic improving code maintainability and API response time through database query optimization
  • Established version control workflow using Git Flow

Fullstack Developer - [03/03/2024 – 01/10/2024]

Anysolution

  • Built backend services using Express.js and TypeScript with RESTful API design
  • Implemented Docker to manage and deploy multi-service applications
  • Made architectural decisions for application design and infrastructure
  • Developed frontend components in React/Next.js with TypeScript
  • Established Git Flow workflow for collaborative development

Android Developer - [20/03/2023 – 01/01/2024]

Barceló Hotels

  • Developed mobile features using Kotlin and Jetpack Compose with MVVM architecture
  • Collaborated in team environment using Git Flow