Leo F.
Back-end and Systems Engineer

Skills

Node.js

Laravel

Nestjs

Typescript

Sql

Javascript

Php

Mongodb

Amazon Aws

React

Leo is available for hire

Meet Leo F.

All Howdy Candidates are vetted for skills and english proficiency.

Bio

Backend Software Engineer with over four years of experience in software engineering. Specialized in designing, developing, and maintaining highly scalable Node.js microservices, with proficiency in handling high-demand services through the use of frameworks such as Nest.JS, Express.js, and TypeScript. Demonstrated expertise in managing both relational and non-relational databases, including MongoDB, MySQL, and PostgreSQL, while leveraging cloud computing services such as RDS, Mongo Atlas, and S3. Extensive experience in developing event-driven microservices using technologies like RabbitMQ and SQS, as well as utilizing an array of AWS tools including CloudWatch, EC2, ECS, and Lambda. Skilled in creating applications with high observability and employing monitoring tools such as New Relic, CloudWatch, and Prometheus. Adept at automated testing across various levels, including unit tests, integration tests, performance testing, service testing, end-to-end testing, and mutation testing.

Back-end Software Engineer
1/1/2021 - Present

Developed and maintained a microservices ecosystem for health education platforms, resulting in daily engagement from thousands of users and processing hundreds of thousands of requests per hour. Leveraged Node.js with TypeScript to design and implement scalable backend services, significantly optimizing performance and user experience. Utilized AWS for deploying applications on a highly scalable infrastructure, adeptly managing the demands of tens of thousands of users and millions of requests per hour. Demonstrated proficiency in handling relational (MySQL, PostgreSQL) and non-relational (MongoDB, Redis) databases, ensuring seamless data management and retrieval for complex applications. Successfully reduced database costs by 83% through strategic migration from MongoDB to SQL databases, utilizing efficient partitioning strategies. Implemented a performance monitoring strategy with custom metrics using the New Relic SDK, enabling real-time insights into application performance. Expertly orchestrated comprehensive testing processes, including service API testing, unit testing, integration testing, performance testing, and mutation testing, thereby ensuring higher code quality and minimizing defects.
Full-Stack Software Engineer
8/2/2020 - 1/1/2021

Led the full-stack development of a dynamic marketing and design management platform. Closely collaborated with the Product Owner to conceptualize, develop, and implement front-end and back-end features. Played a key role in project management, ensuring seamless integration of features and alignment with product goals. Utilized Laravel and ReactJS to create robust and user-friendly web applications. Orchestrated the integration of Ant Design, Redux, Redux-saga, and Redux-forms to enhance UI/UX. Simplified data management with L5Repository, optimizing database interactions. Ensured smooth deployment and scalability with Docker and AWS services. Facilitated seamless cross-functional collaboration, resulting in efficient project execution and feature delivery. Enhanced user experience through meticulous integration of UI/UX technologies, improving engagement metrics.
Junior Web Developer
2/2/2020 - 8/2/2020

Actively contributed to the development of a comprehensive marketing and design management platform as a software engineering intern, focusing on both front-end and back-end features to enhance functionality and usability. Collaborated closely with the Product Owner, which led to significant improvements in user experience. Developed proficiency in Laravel for backend development and ReactJS for frontend, enabling the creation of dynamic web applications. Utilized Ant Design, Redux, Redux-saga, and Redux-forms to optimize UI/UX components. Assisted in database management and interactions using L5Repository, ensuring efficient data handling. Gained valuable experience in deployment and cloud storage solutions through Docker and AWS.