Leonardo Souza - Senior Backend Engineer, SWORD Health

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Work Background

SWORD HealthSenior Backend Engineer

Nov. 2024Portugal- Designed and implemented core platform features for a distributed, high-traffic health tech platform using Go and Node.js, leveraging Claude Code (agentic AI) to accelerate development velocity by 30% while maintaining a rigorous Test-Driven Development (TDD) workflow and ensuring 90%+ test coverage. - Optimized gRPC APIs and MySQL queries across microservices, reducing latency and improving observability through structured logging and monitoring for high-traffic endpoints. - Promoted best practices in backend development, contributing to project planning, code reviews, CI/CD pipelines and ongoing maintenance.

AlticeUSABackend Engineer

Apr. 2022 - Nov. 2024United States- Designed and implemented gRPC services in Go for an in-house CRM platform, achieving a 20% performance improvement by optimizing database queries with efficient indexing and caching, while ensuring scalability and maintainability through modular design and Go’s concurrency patterns. - Integrated the Go-based backend system with a legacy SOAP-based platform using the gowsdl library to generate Go code from WSDL services, enabling seamless data exchange and operational continuity. - Integrated the backend system with multiple external RESTful APIs, handling complex data workflows to ensure reliable communication with third-party services. - Utilized GCP services (Cloud Run, Cloud Spanner, Pub/Sub) within a Go environment to enhance application reliability and scalability, such as deploying containerized services on Cloud Run and leveraging Pub/Sub for asynchronous event-driven processing. - Contributed to all stages of software development, from requirements analysis to proposing innovative Go-based solutions, such as optimizing API response times, resulting in improved operational efficiency and user satisfaction. - Promoted best practices in Go backend development, including idiomatic Go coding standards, effective use of goroutines, and rigorous code reviews, while contributing to project planning, testing, and ongoing maintenance.

ClevertechBackend Engineer

Nov. 2021 - Feb. 2022United States- Designed and built GraphQL APIs for an incident management application using Node.js, MongoDB and PostgreSQL, integrated with Netsuite ERP and a React frontend. - Utilized AWS services (EKS, S3, SQS) to improve application reliability and scalability.

GFT GroupSoftware Developer

Oct. 2016 - Nov. 2021- Built a Node.js crawler using clustering, cutting API analysis time from 6 to 1.5 minutes for mainframe optimization. - Designed microservices with Java, Spring Boot and Command Query Responsibility Segregation(CQRS), deployed on Azure, improving scalability by 30%. - Architected and documented RESTful APIs using OpenAPI and Swagger, applying Domain-Driven-Design principles to restructure API contracts and integrate backend microservices. - Led junior developers in agile sprints, unblocking issues and guiding architecture decisions.

Porto SeguroWeb Developer

Jul. 2015 - May. 2016São Paulo Area, BrazilDevelopment of a chat system that was one of the channels for the client to make an insurance quote. This chat system was built using Node.js, Laravel framework (PHP) and MongoDB.

Editora ModernaSoftware Developer

Feb. 2014 - Jul. 2015São PauloDevelopment of a platform to manage schools, clients (parents) and students and enable sales of textbooks. This platform was built using PHP with Yii Framework and MySQL Database. Integration with the financial manager (SAP) to generate invoices. Deployment using AWS platform.

W51 Informática e MarketingSoftware Developer

Oct. 2013 - Feb. 2014São Paulo e Região, BrasilDevelopment of e-commerce using Magento Server configuration for deployment Development of customized websites using WordPress

NA5PHP Developer

Mar. 2013 - Oct. 2013São Paulo Area, BrazilDevelopment of e-commerce using Magento Server configuration for deployment. Development of customized websites using WordPress

TracersoftSoftware Developer

May. 2009 - Feb. 2013Development of an invoice issuing system. Development of a system for monitoring city indicators. Development of a system to classify less polluting companies. Development using PHP with Yii framework. Using of MySQL and PostgreSQL databases

Cuca PropagandaPHP Developer

Apr. 2008 - May. 2009São Paulo e Região, BrasilDevelopment of customized websites using WordPress. Development of e-commerce using Magento

Infoconsult Consultoria e InformáticaSoftware Developer

Feb. 2006 - Jun. 2007Rio de Janeiro e Região, Brasil Development new feature for the system marketed by the company to provide advice on foreign trade

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Leonardo Backend Engineer: 18+ Years Experience

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