Sajad Hayatlou

Sajad Hayatlou | Lobox

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Member since: Dec 01, 2024

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Bio

Senior Java / Backend Software Engineer with 12+ years of experience designing, building, and operating backend systems across telecommunications, enterprise security, and e-commerce domains. Strong hands-on expertise in Java 8-21, Spring Boot, microservices, Kafka, AWS, Kubernetes, PostgreSQL, Redis, and Elasticsearch, with experience spanning architecture, production troubleshooting, observability, performance testing, code quality, and automated testing. Delivered distributed systems using CQRS and Event Sourcing, security-focused backend platforms, and containerized production services, including JMeter-based performance testing in e-commerce systems. Documented impact includes a 45% reduction in code smells and duplications and an increase in automated test coverage from 22% to 75%.

Experience

Architect and develop Java microservices for critical telecommunications and e-commerce backend systems. Improved cart-service performance by 21% through database query optimization and effective caching. Use JMeter for performance testing and validation. Deploy and manage containerized services on Kubernetes. Establish Prometheus, Grafana, and Jaeger observability for production reliability, performance diagnosis, and incident troubleshooting. Mentor early-career engineers through hands-on work with production systems and microservice architecture. Produce extensive daily business reports that identify product preferences by age group. Enabled more effective sales campaigns, contributing to a sales increase of more than 12%. Collaborate with cross-functional teams to define technical requirements and architecture. Ensure scalability and reliability of backend systems through SRE-oriented practices. Conduct code reviews and enforce clean code standards. Troubleshoot production issues to minimize downtime. Optimize database queries and caching strategies. Implement security best practices in microservices. Participate in on-call rotation for production support. Document technical designs and system architecture.

Engineered scalable Java REST APIs and microservices, including CORS and Event Sourcing services with Axon Framework for complex workflows. Designed practical architectural solutions for complex technical problems. Diagnosed production issues in AWS/Kubernetes environments to protect service reliability. Refactored legacy backend services for maintainability and performance. Updated the Docker stack for ARM-based development and deployment. Implemented CQRS patterns for distributed systems. Developed high-level technical designs. Ensured code quality through unit and integration testing. Optimized system performance and scalability. Collaborated with product managers to translate requirements into technical solutions. Monitored production systems using observability tools. Participated in agile development processes. Mentored junior developers on best practices. Contributed to architectural decisions and code reviews. Automated deployment pipelines using CI/CD tools. Documented APIs and microservices architecture.

Delivered backend capabilities for customized customer bulletins, enabling more targeted content experiences. Led a large-scale refactoring initiative that reduced code smells and duplications by approximately 45%. Validated improvements through SonarQube. Monitored, troubleshot, and optimized AWS-hosted production services. Applied SRE-oriented practices to improve reliability and operational performance. Developed REST APIs for customer bulletins. Implemented automated testing to ensure code quality. Collaborated with remote teams to deliver features. Optimized database queries for performance. Participated in code reviews and knowledge sharing. Documented technical solutions and processes. Contributed to continuous integration and deployment pipelines. Troubleshot production issues and implemented fixes. Ensured high availability of backend services. Worked with cross-functional teams to meet business goals. Maintained and improved legacy systems.

Contributed end-to-end to Atlas (PAM), translating complex requirements into scalable technical designs. Implemented fine-grained authorization and login policies. Integrated Elasticsearch for audit-log search. Built LDAP user import and synchronization. Raised automated test coverage from 22% to 75%, strengthening regression protection. Developed backend services for privileged user activity monitoring. Designed and implemented security-focused features. Collaborated with security teams to meet compliance requirements. Optimized system performance and scalability. Participated in code reviews and architectural discussions. Documented technical designs and system configurations. Troubleshot production issues and provided solutions. Implemented unit and integration tests using JUnit and Mockito. Used SonarQube for continuous code quality monitoring. Worked in agile environment with regular sprints. Mentored junior engineers on best practices.

Developed and maintained backend services for Derakht, an e-commerce platform for digital content. Built and secured REST APIs with Django. Added unit/integration tests with continuous Sonar-based quality monitoring. Created Beautiful Soup crawling scripts for text processing and data extraction. Implemented authentication and authorization mechanisms. Optimized database queries for performance. Collaborated with frontend developers to integrate APIs. Participated in code reviews and team meetings. Documented APIs and technical processes. Troubleshot and fixed production issues. Worked with product managers to define requirements. Ensured code quality through automated testing. Contributed to continuous integration pipelines. Maintained and improved existing codebase. Developed new features for e-commerce platform. Used version control systems for code management.

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