Julian Acosta
Summit,Illinois
Summary
Motivated professional eager to embrace new challenges. Demonstrates a strong work ethic and adaptability, with proven interpersonal skills. Capable of working independently and rapidly acquiring new competencies.
Overview
10
10
years of professional experience
5
5
Certification
Work History
Systems Engineer III | Application Recovery
United Airlines
Arlington Heights, IL
10.2025 - Current
- Provided operational support within the Digital Technology Command Center through proactive monitoring and rapid incident response for production environments and digital channels.
- Monitored application health, system availability, and infrastructure performance across UNIX/Linux (AIX, Solaris, Linux, HPUX), Windows, virtualization platforms, middleware, and AWS cloud environments.
- Supported distributed systems and enterprise applications by analyzing alerts, correlating events from multiple monitoring tools, and prioritizing high-impact incidents to minimize downtime and business disruption.
- Utilized enterprise monitoring platforms including Dynatrace, Datadog, AppDynamics, LogicMonitor, and SCOM to monitor infrastructure, applications, and services.
- Investigated and resolved production incidents involving middleware technologies such as Oracle WebLogic Server, IBM WebSphere Application Server, messaging systems, and IBM DataPower Gateway.
- Collaborated with cross-functional IT teams to isolate root causes of outages, restore services quickly, and support planned maintenance and change management activities.
- Responded to escalations from the IT Service Desk and managed incident workflows through ServiceNow to ensure timely issue resolution and accurate documentation.
- Supported cloud and virtualized environments, including AWS, VMware, and Hyper-V, ensuring stability, system performance, and operational continuity.
- Performed system administration and operational support tasks for mission-critical production systems, including log analysis, service validation, and process monitoring.
- Developed and maintained Shell and Golang scripts to automate alert remediation, improve operational efficiency, enhance error handling, and optimize monitoring processes.
- Participated in application recovery procedures and disaster recovery support activities to maintain high availability and business continuity.
- Conducted performance analysis and troubleshooting using application logs, system metrics, and monitoring dashboards to proactively identify and resolve issues before impacting end users.
Site Reliability Engineer
Okta
Chicago, Illinois
01.2023 - 06.2025
- Troubleshot complex application architecture and system configuration issues.
- Collaborated with service teams to enforce release engineering best practices.
- Optimized infrastructure components for cost efficiency while ensuring compliance.
- Managed Kubernetes clusters, including scaling and configuration adjustments to enhance performance.
- Created and updated Confluence runbooks, promoting knowledge sharing and consistency.
- Conducted performance analysis using DataDog to identify critical metrics for maintenance planning.
- Responded effectively to DDoS and rate-limiting alerts, implementing Cloudflare security measures.
- Collaborated on the automation of complex manual tasks using Golang.
- Infrastructure as Code (IaC): Utilized Terraform to automate the provisioning and management of cloud infrastructure on platforms such as AWS and Azure.
- Configuration Management: Developed and maintained Terraform configuration files (.tf) and variable definition files (.tfvars) to manage resources like EC2 instances and S3 buckets.
- Environment Management: Updated .tfvars files to manage environment-specific configurations (e.g., development, staging, production), ensuring consistent deployment across multiple environments.
- Version Control: Collaborated with development teams to version-control Terraform configurations using Git, enabling better tracking of changes, and facilitating team collaboration.
- CI/CD Integration: Integrated Terraform with CI/CD pipelines to automate deployments, reducing manual intervention, and increasing deployment speed and reliability.
Platform Operations Engineer
Okta
Chicago, Illinois
03.2022 - 01.2023
- Authored comprehensive documentation detailing operational procedures for platform operations.
- Collaborated with developers to implement code updates while ensuring production stability.
- RDS Management: Configured and managed Amazon RDS instances, implementing Multi-AZ deployments for automatic failover, ensuring high availability, and business continuity.
- EC2 Optimization: Updated and maintained EC2 instances, performing routine patching, and optimizing instance types based on application performance requirements.
- UtilizedTerraform to automate provisioning and configuration.
- Caching Solutions: Managed Redis for caching, configuring clusters, managing persistence settings, and ensuring data availability through replication.
- EKS Deployment: Deployed and managed applications on Amazon EKS (Elastic Kubernetes Service), setting up Kubernetes clusters, and configuring networking to ensure smooth and secure application performance.
- Infrastructure as Code: Leveraged Terraform to manage AWS infrastructure, including RDS, EC2, and EKS, promoting best practices in automation and version control.
- Contributed to cross-functional teams to enhance platform reliability and scalability.
- Conducted service maturity assessments within GitHub repositories to identify improvement opportunities.
- Executed migration tasks from PSaaS into Layer0 ecosystem, ensuring seamless transitions.
Managed Service Engineer
Auth0
Chicago, Illinois
11.2021 - 01.2023
- Enhanced process efficiency and service reliability by developing operational workflows and comprehensive documentation.
- Utilized diagnostic tools to monitor network performance effectively.
- Quickly resolved customer service requests within designated time limits.
- Managed escalated complaints related to product quality and service issues.
- Executed preventive maintenance tasks for customer systems in accordance with schedules.
- Evaluated training requirements for maintenance staff, organizing skill development initiatives.
- Worked with cross-functional teams to support upgrades and expansions of facilities.
Cloud Systems Engineer L2
Ultra Commerce
Chicago, Illinois
06.2019 - 11.2021
- Managed full application stacks in AWS, ensuring high availability and optimal performance.
- Collaborated with development teams to refine Hybris architecture, boosting operational metrics.
- Automated deployment processes using Jenkins and SmartStack, implementing blue/green strategies for updates.
- Monitored cloud infrastructure to maintain uptime and service availability.
- Coordinated troubleshooting efforts across teams for cloud application issues.
- Analyzed application logs for debugging across multiple cloud services.
- Deployed applications on virtual machines utilizing tools like Jenkins and Rancher.
- Configured networking components, including routers, switches, and load balancers.
Linux System Engineer
Expedia Group
Chicago, Illinois
11.2016 - 06.2019
- Administered AWS infrastructure including VPC, EC2, ELB, and Route 53 with emphasis on security best practices.
- Utilized Ansible for configuration management, reducing manual workload by 20% through efficient playbook implementation.
- Executed regular maintenance tasks such as patching, security updates, and backups to ensure system reliability.
- Ensured high availability of critical services using automated failover techniques.
- Developed scripts to automate system administration tasks, enhancing operational efficiency.
- Migrated applications from legacy platforms to modern Linux distributions.
- Implemented security hardening best practices for Linux servers to protect sensitive data.
- Managed user accounts and permissions at the file system level for multiple users.
Linux System Administrator
Walgreens
Deerfield, Illinois
05.2016 - 11.2016
- Executed backup and recovery processes using tar, ensuring data integrity across systems.
- Automated administrative tasks with Cron jobs, enhancing system efficiency and minimizing downtime.
- Installed, configured, and upgraded Linux operating systems and associated services.
- Collaborated across teams to deploy applications on Linux platforms effectively.
- Regularly deployed updates, patches, and hotfixes to secure systems from vulnerabilities.
- Monitored system performance, implementing changes for optimal resource utilization.
- Managed user accounts on Linux by creating and modifying users based on requirements.
- Developed automation scripts for system administration tasks using Bash.
Skills
- Kubernetes management
- Cloud infrastructure
- Deployment automation
- Performance monitoring
- Scripting languages
- Documentation practices
- Service reliability
- Knowledge sharing
- Disaster recovery
Accomplishments
- 2020 Ultra Commerce CEO Award
Certification
- AWS Certified Solutions Architect - Professional
- AWS Certified Solutions Architect - Associate
- Tines Core Certificate
- Red Hat Certified System Administrator (RHCSA)
- Google IT Support Professional Certificate
References
References available upon request.
Timeline
Systems Engineer III | Application Recovery
United Airlines
10.2025 - Current
Site Reliability Engineer
Okta
01.2023 - 06.2025
Platform Operations Engineer
Okta
03.2022 - 01.2023
Managed Service Engineer
Auth0
11.2021 - 01.2023
Cloud Systems Engineer L2
Ultra Commerce
06.2019 - 11.2021
Linux System Engineer
Expedia Group
11.2016 - 06.2019
Linux System Administrator
Walgreens
05.2016 - 11.2016