Lucas Guedes

Senior Software Engineer focused on building and evolving cloud-native backend services supporting high-traffic and mission-critical production workloads. • Designed and developed using Java (Spring Boot, Quarkus) and Node.js • Built scalable, high-performance RESTful APIs handling tens of thousands of daily requests • Applied Clean Architecture and Domain-Driven Design (DDD) principles • Owned the full service lifecycle — architecture, development, CI/CD, deployment, monitoring, and production support • Operated services in AWS and Microsoft Azure environments • Contributed to 99.9%+ availability, improving system reliability and operational stability Additionally: • Acted as technical point of contact for strategic clients • Led incident analysis and resolution for critical production issues • Collaborated within an international team, communicating daily in English • Contributed to architectural decisions and engineering standards Backend Engineering | Microservices | Java | Spring Boot | Quarkus | Node.js | REST APIs | Cloud Native | AWS | Azure | CI/CD | Distributed Systems | High Availability | Incident Management

Worked on the development and support of backend systems for one of the largest e-commerce platforms in Brazil, handling high volumes of concurrent requests and mission-critical operations. • Developed high-performance and scalable APIs using Node.js and TypeScript • Built distributed services applying Domain-Driven Design (DDD) and Test-Driven Development (TDD) • Focused on resilience, performance, and long-term maintainability • Contributed to systems operating under high transactional volume and complex architectural environments • Reduced technical debt and improved overall system stability Key contributions: • Improved service resilience and fault handling • Optimized performance under peak traffic conditions • Supported critical production systems ensuring high availability • Participated in architectural decisions to maintain scalability and reliability Backend Engineering | Node.js | TypeScript | REST APIs | Microservices | Distributed Systems | DDD | TDD | High Availability | Performance Optimization | Resilience | E-commerce | Software Architecture

Developed backend and full-stack solutions for distributed systems running in cloud environments, focusing on scalability, stability, and continuous architectural improvement. • Built backend services for distributed systems with emphasis on scalability and reliability • Contributed to the evolution of service communication patterns and existing system architecture • Worked directly with clients on technical analysis and problem resolution • Implemented critical fixes and supported structural improvement initiatives • Actively contributed to performance optimization and production reliability improvements Key responsibilities: • Technical analysis and troubleshooting of production issues • Implementation of critical corrections and system improvements • Planning and execution of architectural enhancements • Performance and reliability improvements in production environments Backend Engineering | Distributed Systems | Cloud Computing | Microservices | System Architecture | Performance Optimization | Reliability | Production Support | Full-Stack Development

Worked as a Tech Lead, leading a team of 5–8 engineers and responsible for defining the technical and architectural direction of backend systems. • Provided technical leadership, mentorship, and engineering guidance to the team • Defined architectural standards and best practices for microservices-based environments • Led modernization and migration initiatives from legacy systems to scalable and highly available architectures • Designed and implemented distributed systems using Java and Node.js • Introduced gRPC service communication, reducing inter-service latency by approximately 20% • Actively participated in technical planning and system evolution Key contributions: • Technical planning and solution design • Architectural reviews • Team mentorship and technical guidance • Code reviews and quality standardization • Strategic collaboration with product teams Tech Lead | Technical Leadership | Microservices | Software Architecture | Distributed Systems | Java | Node.js | gRPC | High Availability | Scalability | System Modernization | Backend Engineering

Developed and maintained backend services in a distributed environment, focusing on scalability and integration with critical systems. • Built distributed backend services with emphasis on scalability and reliable system integration • Worked directly with clients to evolve applications and propose structural improvements • Worked with AWS, supporting infrastructure, scalability, and continuous integration practices (DevOps) • Participated in technical decisions related to system availability and data integrity • Contributed to the technical roadmap and overall system evolution Backend Engineering | Distributed Systems | AWS | Cloud Computing | DevOps | Microservices | System Scalability | Data Integrity | High Availability | Software Engineering

Returned to the company taking on increased technical and strategic responsibilities, contributing to medium and large-scale enterprise projects. • Built and maintained enterprise-grade backend systems • Designed and integrated REST APIs across multiple internal platforms • Worked directly with corporate clients conducting technical and strategic discussions • Led requirements gathering and development planning activities • Provided technical coordination and guidance for development teams during project execution • Contributed to quality assurance, delivery organization, and development process improvements Key contributions: • Technical alignment with stakeholders and business teams • Solution design and technical decision-making • Integration between enterprise systems and internal platforms • Improvement of development and delivery processes Backend Engineering | REST APIs | Enterprise Systems | System Integration | Software Architecture | Technical Leadership | Requirements Analysis | Software Delivery | Process Improvement

Developed enterprise systems working across backend and frontend technologies, contributing to medium and large-scale projects in collaborative, multi-team environments. • Built and maintained enterprise-grade backend systems • Designed and integrated REST APIs across multiple internal platforms • Developed solutions using Java, Node.js, PHP, Angular, React, and Ionic • Contributed to the creation and structuring of multiple corporate systems, including a large-scale e-learning platform integrated with several services • Worked directly with clients, participating in technical and structural decision-making • Delivered solutions requiring scalability, transactional integrity, and integration between heterogeneous technologies Key contributions: • Development of scalable enterprise applications • Integration between multiple systems and technologies • Technical collaboration with stakeholders and clients • Support for architectural and structural decisions Backend Engineering | REST APIs | Enterprise Systems | System Integration | Java | Node.js | Angular | React | Distributed Systems | Software Development | E-learning Platforms

Developed and maintained business systems supporting municipalities and public sector organizations. • Built and maintained enterprise systems using VB6 and Microsoft SQL Server (MSSQL) • Implemented new features based on business requirements and user needs • Provided production support for live systems, ensuring stability and operational continuity • Contributed to the continuous evolution and reliability of internal applications Key contributions: • Participated in the restructuring of an accounting system to comply with 2013 public sector regulatory changes • Ensured compliance with updated government accounting standards • Supported the stability and operation of mission-critical production systems used by public institutions Software Development | Enterprise Systems | VB6 | Microsoft SQL Server | MSSQL | Production Support | Legacy Systems | System Maintenance | Public Sector Systems