Calel Costa

- Design, develop, and maintain high-availability backend systems supporting large-scale financial transactions in a fintech environment. - Build and maintain robust API integrations with internal and external partners, ensuring reliability, performance, and security. - Design and orchestrate complex business workflows using Temporal, enabling fault-tolerant, scalable, and observable distributed processes. - Develop microservices using Java and Spring Boot, following clean architecture principles and domain-driven design. - Monitor, troubleshoot, and optimize critical integrations, proactively identifying bottlenecks and improving system resilience. - Implement performance optimizations across services, reducing latency and improving throughput under high traffic conditions. - Work extensively with PostgreSQL, designing schemas, optimizing queries, and ensuring data consistency. - Deploy and operate services on AWS, leveraging cloud-native services and best practices for scalability, observability, and cost efficiency. - Collaborate closely with product managers, QA, and other engineering teams to deliver reliable, high-impact financial features. - Participate in code reviews, architectural discussions, and continuous improvement of engineering standards and practices.

- Designed and implemented microservices with Node.js and MongoDB. - Applied performance optimization and security best practices across critical systems. - Facilitated agile development process and supported team growth.

- Led backend and full-stack development for high-traffic services using Node.js and related technologies. - Mentored junior developers and conducted code reviews to improve quality and maintainability. - Collaborated with cross-functional teams to deliver scalable APIs and automated deployments.

Design, develop, deploy and maintain Information Systems; Manage systems Development teams; Diagnose problems and propose improvements based on computer systems; Properly apply computational resources (hardware and software); Design and implement Information Systems adhering to the strategic objectives of organizations; Produce software using appropriate methods and techniques and aiming to achieve essential software attributes.