Omar Rebollo
Senior Backend Engineer (Technical Lead) @埃森哲
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WORK HISTORY
Senior Backend Engineer (Technical Lead) @埃森哲
Mexico City, MX
Client: FedEx (global logistics and shipping platform).• Designed and led the implementation of a scalable microservices architecture using Spring Boot and Spring Cloud, supporting millions of daily transactions.• Drove backend modernization efforts, migrating legacy monolithic systems to distributed cloud-native architectures.• Improved system performance by identifying database bottlenecks and implementing a Redis caching layer, reducing response times by ~40%.• Applied resilience patterns (circuit breakers, retries, fallbacks) using Resilience4j to ensure high availability and fault tolerance.• Designed secure and high-throughput REST APIs with JWT-based authentication and optimized data handling.• Built event-driven integrations using Amazon SNS to enable asynchronous and decoupled communication.• Deployed and operated containerized microservices on AWS (EKS, ECS Fargate), enabling scalable and resilient infrastructure.• Established observability practices using ELK, Prometheus, and Grafana to improve system monitoring and incident response.• Implemented CI/CD pipelines and DevOps practices, improving release cycles and engineering efficiency.
EDUCATION
Tecnologico de Estudios Superiores de Ecatepec
Engineer’s Degree
SKILLS
ABOUT OMAR REBOLLO
Senior Backend Engineer with 9+ years of experience designing and scaling distributed systems in enterprise environments. I specialize in building high-performance, cloud-native platforms using Java and Spring Boot, with a strong focus on scalability, reliability, and secure system design. Throughout my career, I have led backend modernization initiatives, including the migration of legacy monolithic systems to microservices-based architectures, significantly improving system scalability, maintainability, and performance. I have designed and implemented RESTful APIs, event-driven systems, and distributed caching solutions to support high-throughput applications.My expertise includes:• Diagnosed latency bottlenecks in core database queries and designed a Redis-based caching solution, reducing response times by ~40% and improving performance for high-traffic endpoints.• Designing scalable microservices architectures and high-throughput APIs • Modernizing legacy systems into cloud-native distributed platforms • Implementing secure authentication and authorization (OAuth2, OIDC, JWT) • Optimizing performance through distributed caching strategies (Redis) • Building event-driven architectures using asynchronous messaging patterns • Working across Azure and AWS cloud environments • Implementing CI/CD pipelines and DevOps practices for reliable deployments • Leading backend initiatives and driving engineering best practices across teams I am particularly interested in solving complex backend challenges at scale and contributing to teams building resilient, high-impact distributed systems.Currently based in Mexico, open to relocation to Canada.
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