Luis Ramírez Calle

Senior Software Engineer and hands-on Tech Lead with nearly 10 years of full-stack development experience across SaaS, e-commerce and logistics. Specializes in TypeScript, Node.js, NestJS, React, Vue.js, Nuxt and PostgreSQL. Has built products from zero to production and led a 4-person team on an e-commerce platform processing approximately 1,000 orders per day. Experience in legacy code refactoring, platform modernization and Nuxt 2 to Nuxt 3 migration. Owns architecture, automated testing, security, CI/CD and production operations, with practical AI integration experience using OpenAI API, RAG and AI SDK.

TypeScript, JavaScript, Python (working knowledge), PHP

Node.js, NestJS, Express, Laravel, Symfony, REST APIs, GraphQL, third-party integrations, asynchronous processing, background jobs, Redis, BullMQ

React (React.js), React Router, Next.js, Vue.js, Nuxt, Vite, Tailwind CSS

OpenAI API, Amazon Bedrock, Retrieval-Augmented Generation (RAG), AI SDK, Large Language Model (LLM) integration, AI-assisted engineering workflows

PostgreSQL, MySQL, MongoDB, DynamoDB, Redis, Domain-Driven Design (DDD), Hexagonal Architecture, bounded contexts, PostgreSQL Row-Level Security (RLS), fail-closed authorization, concurrency control

Amazon Web Services (AWS), AWS Lambda, Amazon SQS, Amazon SES, serverless architecture, Infrastructure as Code (IaC) with Terraform, Docker, Docker Compose, Kubernetes, Linux, Cloudflare, Heroku, Continuous Integration / Continuous Delivery (CI/CD), GitHub Actions, GitLab CI, reproducible deployments, database migrations, production operations

Amazon CloudWatch, application error monitoring with Sentry and GlitchTip; payment gateway integrations with Stripe and Redsys

Test-Driven Development (TDD), Vitest, React Testing Library, Playwright, unit testing, integration testing, HTTP contract testing, end-to-end (E2E) testing, automated quality gates

Legacy code maintenance, behavior-preserving refactoring, technical debt reduction, incremental modernization, framework migrations, regression testing, maintainability

End-to-end ownership, product collaboration, architecture decisions, team leadership, pragmatic engineering and production operations

Co-Founder & CTO / Senior Software Engineer / Freelance

• Built Oncoviva from the ground up as the sole engineer, owning architecture, backend and frontend implementation, deployment, operations and technical product decisions with the CEO.
• Designed a modular architecture using Domain-Driven Design, Hexagonal Architecture and bounded contexts, with NestJS/TypeScript on the backend and React/TypeScript on the frontend.
• Engineered security controls for sensitive data, including 2FA, HttpOnly refresh tokens, PostgreSQL RLS, actor and ownership isolation, fail-closed authorization, atomic locking, concurrency control and replay protection.
• Built integrations with Odoo and DocuSeal, Redsys payment integration, and queue-based background processing with Redis and BullMQ; established reproducible database migrations, Docker/Docker Compose workflows and CI/CD.
• Established automated quality gates with TDD, Vitest, React Testing Library, Playwright, PostgreSQL integration tests, HTTP contracts and Zod, and integrated AI capabilities using OpenAI API, RAG and AI SDK.
• Used GlitchTip for application error monitoring.

Technologies: TypeScript, Node.js, NestJS, React, PostgreSQL, Redis, BullMQ, Docker, Docker Compose, GlitchTip, Redsys, CI/CD, Zod, OpenAI API, RAG, AI SDK

CTO / Tech Lead

• Led technology and product engineering for an e-commerce platform processing approximately 1,000 orders per day, managing a 4-person team while remaining hands-on in delivery.
• Defined architecture, technology strategy and product priorities with business stakeholders, balancing short-term delivery with long-term platform evolution.
• Refactored legacy code in the e-commerce platform to improve maintainability and code quality, addressing technical debt alongside product delivery.
• Led the Nuxt 2 to Nuxt 3 migration, improving performance, maintainability and access to the modern Vue/Nuxt ecosystem.
• Integrated Odoo to automate accounting and manufacturing workflows tied to the order lifecycle.
• Integrated Redsys payments and worked with GitHub Actions and GitLab CI pipelines, using Docker Compose for containerized development workflows.

Technologies: TypeScript, Node.js, Vue.js, Nuxt, PostgreSQL, Odoo, Redsys, Heroku, Docker, Docker Compose, GitHub Actions, GitLab CI

Full-Stack Software Engineer / Tech Lead

• Designed and built a last-mile SaaS platform from the ground up across backend, frontend, cloud infrastructure and external integrations.
• Delivered a system handling approximately 5,000 shipments per day, including integrations with Cainiao and Citibox.
• Implemented cloud infrastructure using AWS Serverless architecture for the logistics platform, with Redis, DynamoDB and MySQL in the stack; integrated Google Maps geolocation and route optimization with Routific, and contributed to MoxDelivery, a SaaS home-delivery platform.
• Worked with Terraform for Infrastructure as Code (IaC), Kubernetes, Docker Compose, and CI/CD pipelines using GitHub Actions and GitLab CI.
• Integrated Stripe payments and used Sentry for application error monitoring.
• Worked with AWS Lambda for serverless execution, Amazon SQS for message queues, Amazon SES for email delivery, Amazon CloudWatch for monitoring, and Amazon Bedrock.

Technologies: Laravel, PHP, TypeScript, Node.js, Vue.js, Nuxt, AWS, Lambda, SQS, SES, CloudWatch, Bedrock, Serverless, Terraform, Kubernetes, Docker, Docker Compose, GitHub Actions, GitLab CI, Sentry, Stripe, Redis, DynamoDB, MySQL, GraphQL, Google Maps, Routific

Full-Stack Software Engineer

• Designed and developed backend and frontend systems for products across multiple industries and enterprise clients.
• For Hörmann, built a real-time monitoring platform for approximately 200 devices distributed across 5 warehouses.
• Delivered additional products including Lenogulf, a seed-trading platform, and HYVE Crowd, a crowdsourcing platform.
• Worked with AWS cloud infrastructure and containerized environments using Docker and Docker Compose.

Technologies: PHP, Laravel, Node.js, React, Vue.js, Nuxt, Next.js, Express, Symfony, MySQL, MongoDB, AWS, Docker, Docker Compose, Tailwind CSS

Founder / Senior Software Engineer (Personal Project)

• Building an open-source educational platform that converts technical documentation into practical learning paths and production-like applications.
• Own product design and implementation, applying use-case-driven architecture, maintainable code and pragmatic software-engineering practices.

Technologies: TypeScript, Node.js, Nuxt, PostgreSQL, Docker, Docker Compose, open source

Language-learning application for practicing everyday conversations through guided dialogues or free text, with configurable voices, role-play and shadowing modes.

Selected open-source work exploring architecture, automation and AI-assisted engineering workflows.

Apply Domain-Driven Design and Hexagonal Architecture when domain complexity justifies them; prefer simple designs when it does not.

Approach existing systems through their business behavior and dependencies. Favor small, behavior-preserving changes supported by regression tests, and incremental modernization over unnecessary rewrites.

Connect product decisions with architecture, implementation, testing, delivery and production operations.

Favor explicit contracts, fail-closed authorization, reproducible delivery and automated integration/E2E testing.

Use AI tooling to accelerate repetitive work, exploration and product integration while retaining engineering judgment for architecture, correctness and security.

Computer Engineering Degree, Information Technology specialization

Spanish (Native) · English (Professional)