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Hi, I’m Leonel Alejandro Salazar Ramirez, a Full Stack Engineer with 9+ years of experience building and operating scalable applications in Agile environments. I’m proficient in TypeScript, JavaScript, React, Next.js, Node.js, and Docker/Kubernetes, and I have strong backend and database skills (MongoDB, PostgreSQL, MySQL, Redis). I enjoy delivering end-to-end solutions, mentoring teammates, and collaborating with product, design, and Ops teams to improve performance, reliability, and user experience.…Hi, I’m Leonel Alejandro Salazar Ramirez, a Full Stack Engineer with 9+ years of experience building and operating scalable applications in Agile environments. I’m proficient in TypeScript, JavaScript, React, Next.js, Node.js, and Docker/Kubernetes, and I have strong backend and database skills (MongoDB, PostgreSQL, MySQL, Redis). I enjoy delivering end-to-end solutions, mentoring teammates, and collaborating with product, design, and Ops teams to improve performance, reliability, and user experience.

Leonel Alejandro Salazar Ramirez

Full Stack Developer, Web Developer, Developer, +6

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Hi, I’m Leonel Alejandro Salazar Ramirez, a Full Stack Engineer with 9+ years of experience building and operating scalable applications in Agile environments. I’m proficient in TypeScript, JavaScript, React, Next.js, Node.js, and Docker/Kubernetes, and I have strong backend and database skills (MongoDB, PostgreSQL, MySQL, Redis). I enjoy delivering end-to-end solutions, mentoring teammates, and collaborating with product, design, and Ops teams to improve performance, reliability, and user experience.…Hi, I’m Leonel Alejandro Salazar Ramirez, a Full Stack Engineer with 9+ years of experience building and operating scalable applications in Agile environments. I’m proficient in TypeScript, JavaScript, React, Next.js, Node.js, and Docker/Kubernetes, and I have strong backend and database skills (MongoDB, PostgreSQL, MySQL, Redis). I enjoy delivering end-to-end solutions, mentoring teammates, and collaborating with product, design, and Ops teams to improve performance, reliability, and user experience.

Available to hire

Hi, I’m Leonel Alejandro Salazar Ramirez, a Full Stack Engineer with 9+ years of experience building and operating scalable applications in Agile environments.

I’m proficient in TypeScript, JavaScript, React, Next.js, Node.js, and Docker/Kubernetes, and I have strong backend and database skills (MongoDB, PostgreSQL, MySQL, Redis). I enjoy delivering end-to-end solutions, mentoring teammates, and collaborating with product, design, and Ops teams to improve performance, reliability, and user experience.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Spanish; Castilian

Fluent

Work Experience

Senior Full Stack Engineer at Freelancer

March 1, 2024 - June 7, 2024

Currently working as a freelance Full Stack Engineer, delivering end-to-end web application solutions using the latest technologies in frontend and backend development.

Senior Full Stack Engineer at Santoli Connected

February 1, 2021 - March 31, 2024

Led the development of scalable web applications, designed microservices architecture with Nest.js, optimized GraphQL APIs, built frontend with React.js and TypeScript, integrated RabbitMQ for event-driven communication, optimized database performance with PostgreSQL and Redis, managed cloud infrastructure on AWS and Azure, developed CI/CD pipelines, implemented comprehensive testing strategies, led Agile processes, collaborated with cross-functional teams, and mentored junior developers.

Full Stack Developer at HUBBERS

December 1, 2018 - January 31, 2021

Developed and maintained scalable Nest.js web applications with RESTful and GraphQL APIs, built frontend interfaces using React.js and Next.js, integrated state management with Redux and React Context API, managed database schemas with PostgreSQL and MySQL, implemented messaging with RabbitMQ, secured authentication with OAuth and JWT, deployed containerized apps with Docker and Kubernetes, automated testing with RSpec, Jest, and Cypress, optimized cloud infrastructure on AWS and Azure, collaborated closely with UI/UX designers and backend engineers, conducted code reviews, and followed Agile methodologies.

Web Developer at MassMutual

November 1, 2017 - November 30, 2018

Designed and developed web applications using JavaScript, TypeScript, Angular, and Express.js. Integrated payment gateways such as Stripe and PayPal. Optimized front-end performance with code splitting and lazy loading. Implemented secure authentication and authorization mechanisms using Devise and JWT. Deployed applications on Azure platform utilizing Azure App Services and Blob Storage. Conducted code reviews and mentored junior developers on best practices.

Senior Full Stack Engineer at Freelancer

March 1, 2024 - June 11, 2024

Currently working as a freelance Full Stack Engineer applying my skills in various projects.

Senior Full Stack Engineer at Santoli Connected

February 1, 2021 - March 1, 2024

Led the end-to-end development of scalable web applications ensuring high availability, performance, and security. Designed and implemented microservices architecture with Nest.js. Developed and optimized GraphQL APIs, built frontend applications in React.js using TypeScript, integrated RabbitMQ for real-time communication, and optimized PostgreSQL database performance using caching with Redis. Managed cloud infrastructure on AWS and Azure, developed CI/CD pipelines with GitHub Actions and Jenkins, and implemented comprehensive testing using RSpec, Jest, and Cypress. Led Agile development processes and provided mentorship to junior developers.

Full Stack Developer at HUBBERS

December 1, 2018 - January 31, 2021

Developed and maintained scalable web applications using Nest.js, Django, and FastAPI. Built interactive frontend interfaces with React.js and Next.js using Material-UI. Managed state with Redux and React Context API, optimized database schemas with PostgreSQL and MySQL. Implemented asynchronous messaging with RabbitMQ, secured authentication systems with OAuth and JWT, and deployed containerized applications using Docker and Kubernetes. Handled cloud infrastructure on AWS and Azure, automated testing with RSpec, Jest, and Cypress, collaborated with UI/UX designers and backend engineers, and participated in Agile workflows.

Web Developer at MassMutual

November 1, 2017 - November 30, 2018

Designed and developed web applications using JavaScript, TypeScript, Angular, and Express.js. Integrated payment gateways like Stripe and PayPal. Optimized front-end performance through code splitting and lazy loading in React.js. Implemented secure authentication mechanisms with Devise and JWT. Deployed applications on Azure, utilizing App Services and Blob Storage. Conducted code reviews and mentored junior developers on best practices.

Senior Full Stack Engineer at Freelancer

March 1, 2024 - June 7, 2024

Currently working as a freelance Full Stack Engineer, providing end-to-end web application development and consulting services.

Senior Full Stack Engineer at Santoli Connected

February 1, 2021 - March 1, 2024

Led the development of scalable web applications focusing on Node.js, Nest.js, Python, Django, FastAPI, and React.js. Designed microservices architecture, optimized GraphQL APIs, and integrated real-time messaging systems using RabbitMQ. Managed cloud infrastructure on AWS and Azure and implemented CI/CD pipelines using GitHub Actions and Jenkins. Collaborated with cross-functional teams and mentored junior developers while following Agile methodologies.

Full Stack Developer at HUBBERS

December 1, 2018 - January 1, 2021

Developed scalable web applications with Nest.js, React.js, and Next.js. Managed database schemas and optimized queries using PostgreSQL and MySQL. Implemented secure authentication systems, built containerized applications with Docker and Kubernetes, and automated testing with Jest and Cypress. Collaborated closely with UI/UX teams and promoted best development practices within Agile workflows.

Web Developer at MassMutual

November 1, 2017 - November 1, 2018

Designed and developed web applications using Angular, TypeScript, and Express.js. Integrated payment gateways and optimized frontend performance. Implemented secure authentication and deployed applications on Azure cloud. Conducted code reviews and mentored junior developers.

Senior Full Stack Engineer

February 20, 2021 - March 20, 2026

Designed and deployed scalable cloud-native applications using AWS services including Lambda, API Gateway, and S3; built a microservices-based architecture using Node.js and RESTful APIs; containerized deployments with Docker; implemented CI/CD pipelines; integrated DynamoDB, MongoDB, and AWS RDS; collaborated with distributed teams to deliver features from concept to production and promoted automation to improve engineering productivity.

Full Stack Developer at Freelance

March 20, 2024 - Present

Developed and maintained full stack applications using TypeScript and modern frameworks, improving overall app performance by 20-25% through optimized rendering and API design. Built responsive and intuitive user interfaces aligned with modern UX standards, enhancing user experience and reducing UI-related issues. Designed and implemented RESTful APIs and microservice architectures for complex workloads. Created Backend-for-Frontend layers to streamline frontend-backend communication, reducing redundant API calls by 20-25%. Provided on-call production support for systems, ensuring timely triage and resolution of customer issues and minimizing downtime. Monitored and maintained CI/CD pipelines, proactively resolving build and deployment issues and improving pipeline reliability. Containerized applications using Docker and deployed via Kubernetes, enabling scalable and consistent environments. Worked across AWS and Google Cloud environments to support deployment and infrastructure needs.

Full Stack Developer at Freelancer

March 1, 2024 - Present

Developed and maintained full stack applications using TypeScript and modern frameworks, improving overall application performance by 20-25% through optimized rendering and API design. Built responsive and intuitive user interfaces aligned with modern UX standards, enhancing user experience and reducing UI-related issues. Designed and implemented RESTful APIs and microservices architecture, creating Backend-for-Frontend layers to streamline frontend-backend communication and reduce redundant API calls by 20-25%. Provided on-call support for production systems, ensuring timely triage and resolution of customer issues and minimizing downtime. Monitored and maintained CI/CD pipelines, proactively resolving build and deployment issues and improving pipeline reliability.