Sr Infrastructure Specialist - OT/Critical Infrastructure

Tetra Tech; Orlando (FL); On-site; USD 90,000 - 120,000; Full time

Benefits offered by this job

401(k) and Roth 401(k)

Dental Insurance

Health Insurance

Life Insurance

Vision Insurance

Employee Stock Purchase Plan

Paid time off

Performance Bonus

Career Growth Opportunities

Job summary

Tetra Tech in Orlando, Florida, is seeking a Senior Infrastructure Specialist to lead the design and implementation of infrastructure solutions. This senior technical role requires independent operation in a fast-paced environment, focusing on network systems supporting critical infrastructure.

The ideal candidate will have extensive experience in routing protocols, network design, and troubleshooting, along with strong documentation and communication skills. Enjoy competitive benefits including health insurance and a performance bonus.

Qualifications

• Minimum of seven years of technical experience or relevant education.
• Advanced knowledge of routing protocols and switching technologies.
• Strong packet analysis and troubleshooting capability.

Responsibilities

• Lead architecture, design, and support of infrastructure solutions.
• Design and troubleshoot routed and switched network environments.
• Develop and maintain technical documentation.

Skills

Routing protocols (BGP, OSPF, HSRP, VRRP)

VLANs and switching technologies

IPsec and VPN technologies

Packet analysis and troubleshooting

Technical documentation skills

Communication skills

Education

Equivalent combination of education and experience

Tools

Microsoft Visio

Azure

AWS

Job description

Overview

We are seeking a Senior Infrastructure Specialist to support the design, implementation, troubleshooting, and support of enterprise and industrial infrastructure environments across multiple client projects. This is a senior-level technical role for someone who can operate independently in a fast-paced professional services environment and contribute across architecture, technical design, implementation, documentation, and advanced troubleshooting. The role focuses on network and infrastructure systems that support operational technology and critical infrastructure environments, including data centers, industrial facilities, utility-related systems, and remote connectivity.

Responsibilities

• Lead the architecture, design, implementation, and ongoing support of infrastructure solutions across multiple concurrent client projects
• Design, deploy, and troubleshoot routed and switched network environments for enterprise, industrial, and critical infrastructure systems
• Perform advanced troubleshooting across routing, switching, firewall, wireless, LTE/cellular, cloud, remote access, and general infrastructure connectivity issues
• Support infrastructure modernization, upgrades, expansions, migrations, and cutovers with a focus on reliability, maintainability, and operational continuity
• Build and maintain standardized configurations, templates, and support processes to improve consistency across projects and client environments
• Collaborate with internal team members, project managers, cybersecurity personnel, field teams, and client stakeholders to deliver high-quality technical outcomes
• Support environments requiring resilient and secure communications, including high-availability designs, WAN connectivity, VPNs, and remote site connectivity
• Support LAN, WAN, and wireless infrastructure design, implementation, and troubleshooting
• Support Azure and/or AWS infrastructure and networking environments
• Develop network designs including IP addressing schemes, segmentation strategies, and resilient architecture patterns
• Develop and maintain technical documentation, including logical and physical network diagrams, Visio drawings, implementation plans, cut sheets, and as-built documentation

Required Qualifications

• Minimum of seven (7) years of technical experience, or an equivalent combination of relevant education, certifications, and hands-on technical experience
• Advanced knowledge of routing protocols including BGP, OSPF, HSRP, and VRRP
• Proficiency in switching technologies including VLANs, STP, RSTP, RPVST+, and VPC
• Strong understanding of IPsec, VPN, and secure remote access technologies
• Experience with LTE/cellular connectivity solutions
• Strong packet analysis and troubleshooting capability using packet captures, routing validation, and protocol-level diagnostics
• Strong technical documentation and diagramming skills, including Microsoft Visio
• Ability to manage and prioritize work across multiple active projects and support efforts
• Effective communication skills for both technical teams and clients
• Strong ownership, follow-through, and attention to detail

Preferred Qualifications

• Experience in IT, OT, industrial, utility, power, or critical infrastructure environments
• Experience with VMware, virtual networking, or virtualized infrastructure environments
• Experience with Azure and/or AWS networking
• Experience supporting multiple concurrent projects in a consulting, systems integration, or client-facing services environment
• Cybersecurity experience, especially in segmentation, secure access design, firewall policy support, and infrastructure hardening
• CISSP certification is a plus

Work Conditions

• Must have a valid driver’s license and be authorized to work in the United States
• Subject to a background check, as well as drug and alcohol testing, per applicable federal regulations

Benefits

• 401(k) and Roth 401(k)
• Dental Insurance
• Health Insurance
• Life Insurance
• Vision Insurance
• Employee Stock Purchase Plan (ESPP)
• Paid time off
• Performance Bonus
• Career Growth Opportunities and Training

Why Tetra Tech Digital Systems

In addition to rewarding job opportunities and continuous growth, we offer an enjoyable working environment, where teamwork and respectful collaboration is highly valued. We offer the benefits of a midsized local office atmosphere backed by a large network of highly skilled professionals.

Tetra Tech Digital Systems is proud to be an Equal Opportunity Employer. All qualified candidates will be considered without regard to race, color, religion, national origin, military or veteran status, gender, age, disabilities, pregnancy and pregnancy-related conditions, genetic information and any other characteristics protected by the law. We invite resumes from all interested parties.

Additional Information

• Organization: 227 DSX