Lennon D.
Back-end and Systems Engineer

Skills

Typescript

Sql

Github

Java

Javascript

Kotlin

Php

Python

Amazon Aws

Docker Cloud

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Bio

Mathematics student and systems developer focused on back-end development with additional skills in DevOps and front-end technologies. Demonstrates expertise in clean code practices and design patterns, proficient in languages such as PHP, Java, and Kotlin, alongside the development of small APIs using Python and TypeScript. Commands a strong understanding of Linux, infrastructure management, networking, and application containerization, and has a track record of refactoring complex codebases successfully.

Engages in DevOps roles, showcasing proficiency in the AWS ecosystem and Infrastructure-as-Code deployment strategies, while also capable of managing front-end development tasks when required. Currently, there is an active pursuit of expanding knowledge and experience in the fields of data science and engineering, driven by a growing passion for mathematics.

Backend Developer, focus on data engineering
6/1/2023 - Present

Developed proficiency in data modeling and documentation, with a focus on financial market data sources such as treasury bonds, various funds, and B3 stock exchange shares. Implemented data integration ETL processes to efficiently handle and merge data from these diverse sources. Demonstrated expertise in creating and deploying financial indicators, as well as exposing this data via APIs for seamless integration and utilization.
Backend Developer
6/1/2021 - 5/1/2023

Gained proficiency in developing new features for the Astrea law office management system using Java and Kotlin. Implemented various endpoints in the internal API using TypeScript to facilitate searching in Elasticsearch. Engaged in unit and integration testing to ensure the robustness and reliability of the code. Managed the deployment and monitoring of new application versions on Google Cloud Platform (GCP), ensuring smooth and efficient delivery and operation of the software.
Backend and DevOps Developer
11/1/2019 - 6/1/2021

Directed the migration of the main system from a shared host to AWS, initially utilizing EC2 and subsequently transitioning to ECS. Configured necessary systems including setting up the network on VPC, DNS management on Route53, database configurations on RDS, and implementing certificates on ACM with an Application Load Balancer. Developed continuous integration and deployment pipelines using Jenkins integrated with Ansible for deploy infrastructure automation. Authored Dockerfiles for applications in Python, Node.js, and PHP, typically incorporating NGINX to ensure consistency in both production and development environments for the team. Configured NGINX web servers and, to a lesser extent, Apache web servers. Refactored a PHP codebase originally written without a framework or code quality standards, applying SOLID principles, design patterns, and re-architecting the system with Clean Architecture using the Slim framework. Oversaw and conducted code reviews on pull requests from less experienced team members to maintain code quality and mentorship.
Junior Development Assistant
10/1/2018 - 11/1/2019

Developed proficiency in implementing new products and plugins within an Open Source marketing automation system (Mautic) using Symfony. Gained extensive experience in refactoring legacy PHP codebases to enhance system functionality and maintainability.
Development Intern
8/1/2018 - 10/1/2018

Gained foundational experience in software development through an internship role. Engaged in handling escalations from level 3 support to the development team. Assisted senior developers in the implementation of new products and features, contributing to an iterative improvement process. Acquired essential skills in problem-solving and troubleshooting, while also becoming familiar with internal escalation protocols, collaboration tools, and development frameworks.