Senior System Engineer

Realtime Recruitment; Philadelphia (Philadelphia County); Hybrid; USD 120,000 - 150,000; Full time

Benefits offered by this job

Competitive salary

Comprehensive benefits

Flexible hybrid environment

Professional development

Large-scale infrastructure work

Job summary

Realtime Recruitment seeks a Senior Systems Engineer to design, implement, and support enterprise application delivery and security across on-premises and hybrid cloud environments. The role focuses on F5 load balancing, ingress, Linux, Kubernetes, OpenShift, and cloud tech to ensure high availability and security for mission-critical apps.

Location is Hybrid – Philadelphia area; on-call rotations apply. You will lead upgrades, migrations, and automation initiatives in a fast-growing tech

Qualifications

• Bachelor's degree or equivalent experience required.
• 8+ years of infrastructure, systems, platform, or cloud engineering experience.
• 5+ years supporting enterprise application delivery, load balancing, or cloud infrastructure.
• 3+ years operating production Kubernetes and/or OpenShift environments.

Responsibilities

• Act as SME for application ingress and enterprise load balancing.
• Design, implement, and support global load-balancing solutions across data centre and hybrid cloud environments.
• Support the transition from traditional infrastructure to containerized workloads.
• Manage complex infrastructure, networking, security, and application delivery environments.
• Collaborate with networking, security, and operations teams to ensure reliable and secure application delivery.
• Develop automation, documentation, standards, and operational procedures to improve reliability and scalability.
• Lead platform upgrades, migrations, modernization projects, and technical initiatives.

Skills

Excellent troubleshooting

Project leadership

Strong communication

Documentation

Time management

Collaboration

Education

Bachelor's degree in CS/IT/Engineering

Tools

F5 BIG-IP

LTM

ASM / Advanced WAF

SSL/TLS offloading

HA

Global Traffic Management

iRules

NGINX

Kubernetes Ingress

OpenShift Routes

OpenShift

Docker

OCI containers

Container image management

Kubernetes

Cloud networking & security

Reverse proxy

PowerShell

Python/Bash/Ansible

Job description

Join a high-growth technology company supporting a secure, high-volume global platform. We're looking for an experienced Senior Systems Engineer to design, implement, and support enterprise application delivery and security solutions across on-premises and hybrid cloud environments.

This is a hands-on engineering role focused on F5 load balancing, application ingress, Linux, Kubernetes, OpenShift, and cloud technologies, ensuring high availability, scalability, performance, and security for mission-critical applications.

Location: Hybrid – Philadelphia area (local candidates only)

On-Call: Participation in an engineering escalation rotation

Key Responsibilities

• Act as the subject matter expert for application ingress and enterprise load balancing.
• Design, implement, and support global load-balancing solutions across data centre and hybrid cloud environments.
• Support the transition from traditional infrastructure to containerized workloads.
• Manage complex infrastructure, networking, security, and application delivery environments.
• Collaborate with networking, security, and operations teams to ensure reliable and secure application delivery.
• Develop automation, documentation, standards, and operational procedures to improve reliability and scalability.
• Lead platform upgrades, migrations, modernization projects, and technical initiatives.

Required Experience

• Expert hands-on experience with F5 BIG-IP technologies, including:
• Local Traffic Manager (LTM)
• Application Security Manager (ASM) / Advanced WAF
• SSL/TLS offloading and certificate management
• High Availability (HA)
• Global Traffic Management
• iRules
• Traffic engineering
• Extensive experience implementing ingress solutions across physical, virtual, Kubernetes, and OpenShift environments.
• Strong understanding of networking fundamentals including TCP/IP, DNS, PKI, and certificate services.
• Experience with Docker, OCI containers, container image management, Kubernetes, and OpenShift.
• Strong knowledge of cloud infrastructure, networking, security, firewalls, and hybrid cloud architectures.
• Experience with NGINX, Kubernetes Ingress, OpenShift Routes, and reverse proxy technologies.
• Infrastructure automation and scripting using PowerShell, Python, Bash, or Ansible.

Professional Skills

• Excellent troubleshooting and analytical skills.
• Ability to lead projects from design through implementation.
• Strong communication skills with both technical and non-technical stakeholders.
• Collaborative mindset with the ability to work independently.
• Strong documentation, organisation, and time-management skills.
• Commitment to operational excellence and continuous improvement.

Experience & Qualifications

• Bachelor's degree in Computer Science, Information Technology, Engineering, or a related discipline (or equivalent experience).
• 8+ years of infrastructure, systems, platform, or cloud engineering experience.
• 5+ years supporting enterprise application delivery, load balancing, or cloud infrastructure.
• 3+ years operating production Kubernetes and/or OpenShift environments.

Preferred Certifications

• F5 Certified Technology Specialist (CTS) or Certified Solution Expert (CSE)
• Red Hat OpenShift Certification
• AWS, Azure, or Oracle Cloud certifications
• VMware Certified Professional (VCP)

What's on Offer

• Competitive salary and comprehensive benefits package.
• Medical, dental, vision, life insurance, and retirement plan with company match.
• Flexible hybrid working environment.
• Professional development and career progression opportunities.
• Opportunity to work on large-scale, mission-critical infrastructure supporting global enterprise platforms