Systems Administrator - AWS Cloud Operations & Security (On-call)

The Systems Administrator is responsible for the installation, configuration, operation, maintenance, monitoring, and security of enterprise infrastructure and AWS cloud environments. This position supports Windows and Linux servers, cloud services, web applications, databases, and security tools to ensure system availability, performance, and compliance with organizational and regulatory requirements. Key Responsibilities Administer and maintain AWS cloud infrastructure including ALB, EC2, S3, CloudFront, ECS, IAM, VPC, Route 53, Lambda, Systems Manager, CloudWatch, Config, Security Hub, GuardDuty, and AWS Backup. Install, configure, maintain, and troubleshoot Windows Server and Linux operating systems. Administer core infrastructure services including Active Directory, DNS, IIS, FTP, file services, and remote access solutions. Administer and manage several ColdFusion servers with SOLR search. This includes administration and patch management. Monitor cloud resources, operating systems, and applications for availability, performance, security, and cost optimization. Implement and maintain AWS security best practices including IAM least-privilege access, security groups, network segmentation, logging, and monitoring. Support Infrastructure as Code (IaC) and automation initiatives using Terraform and AWS-native tools. Perform routine patch management, vulnerability remediation, system hardening, and maintenance activities. Assist with MySQL database administration and troubleshooting. Support backup, recovery, disaster recovery, and business continuity procedures. Maintain technical documentation, standard operating procedures, and system diagrams. Participate in on-call support, maintenance windows, and incident response activities as required. Minimum Qualifications Minimum 5 years of experience administering Windows and/or Linux server environments. Minimum 2 years of experience administering AWS cloud environments. Preferred Qualifications Bachelor’s degree in Information Technology, Computer Science, Information Systems, or related field; or equivalent experience. Experience with AWS services including ALB, ECs, EC2, S3, IAM, VPC, CloudWatch, Systems Manager, and Security Groups. Experience supporting web applications using IIS and/or Apache. Familiarity with MySQL databases. Experience with security monitoring, vulnerability remediation, patch management, and system hardening. Working knowledge of PowerShell, Bash, or Python scripting. Understanding of cybersecurity frameworks such as NIST SP 800-53 Rev. 5 and FISMA. Strong analytical, troubleshooting, and communication skills. AWS Certified Solutions Architect – Associate, SysOps Administrator, or Security Specialty certification. Experience supporting FedRAMP, FISMA, or other regulated environments. Experience with Splunk Enterprise, Microsoft Sentinel, Security Hub, GuardDuty, and AWS Config. Experience with AWS Systems Manager Patch Manager and Session Manager. Experience with ColdFusion and SOLR Search Engine. Experience with Terraform and Infrastructure as Code methodologies. Experience supporting serverless architectures using AWS Lambda, API Gateway, and CloudFront. Experience with Docker, Amazon ECS, and/or Amazon EKS. Experience supporting Authority to Operate (ATO) environments and security audits. Professional Skills Excellent written and verbal communication skills. Strong customer service and stakeholder engagement skills. Ability to work independently and collaboratively within a team environment. Strong organizational, analytical, and problem-solving capabilities. Ability to manage multiple priorities in a fast-paced environment. Commitment to operational excellence, security, and continuous improvement. Working at ICF ICF is a global advisory and technology services provider, but we’re not your typical consultants. We combine unmatched expertise with cutting-edge technology to help clients solve their most complex challenges, navigate change, and shape the future. We can only solve the world's toughest challenges by building a workplace that allows everyone to thrive. We are an equal opportunity employer. Together, our employees are empowered to share their expertise and collaborate with others to achieve personal and professional goals. For more information, please read our EEO policy. We will consider for employment qualified applicants with arrest and conviction records. Reasonable Accommodations are available, including, but not limited to, for disabled veterans, individuals with disabilities, and individuals with sincerely held religious beliefs, in all phases of the application and employment process. To request an accommodation, please email View email address on click.appcast.io and we will be happy to assist. All information you provide will be kept confidential and will be used only to the extent required to provide needed reasonable accommodations. Read more about workplace discrimination rights or our benefit offerings which are included in the Transparency in (Benefits) Coverage Act. Candidate AI Usage Policy At ICF, we are committed to ensuring a fair interview process for all candidates based on their own skills and knowledge. As part of this commitment, the use of artificial intelligence (AI) tools to generate or assist with responses during interviews (whether in-person or virtual) is not permitted. This policy is in place to maintain the integrity and authenticity of the interview process. However, we understand that some candidates may require accommodation that involves the use of AI. If such an accommodation is needed, candidates are instructed to contact us in advance at View email address on click.appcast.io. We are dedicated to providing the necessary support to ensure that all candidates have an equal opportunity to succeed. Pay Range - There are multiple factors that are considered in determining final pay for a position, including, but not limited to, relevant work experience, skills, certifications and competencies that align to the specified role, geographic location, education and certifications as well as contract provisions regarding labor categories that are specific to the position. The pay range for this position based on full-time employment is: $89,261.00 - $151,744.00 Rockville, MD (MD18) Need help? We're here: View email address on click.appcast.io About ICF ICF is a global consulting and technology services company with approximately 9,000 employees, but we are not your typical consultants. At ICF, business analysts and policy specialists work together with digital strategists, data scientists and creatives. We combine unmatched industry expertise with cutting-edge engagement capabilities to help organizations solve their most complex challenges. Since 1969, public and private sector clients have worked with ICF to navigate change and shape the future. Learn more at icf.com.