ZipRecruiter

Log In

1

Senior Core Network Engineer Jobs in Ontario (NOW HIRING)

NTT Ltd.

Senior Network Engineer

Toronto, ON · Hybrid

Senior Network Engineer responsibilities include managing and optimizing in-house and cloud-based networks, developing and implementing network security protocols, and troubleshooting network issues.

Scotiabank

Senior Network Engineer

Toronto, ON · On-site

Reporting to a Senior Manager, Global Network Engineering - Design, as a Senior Network Engineer ... You possess a strong core foundation experience in fundamental network technologies and protocols.

COMPUTACENTER PLC

Senior Network Engineer

Markham, ON · On-site

CA$100K - CA$120K/yr

About the role The Senior Network Engineer provides onsite technical support, maintenance, and ... Supporting Computacenter's mission and core values * Embrace and support Computacenter's mission ...

Definity Financial

Senior Network Engineer

Toronto, ON · Hybrid

CA$69K - CA$119K/yr

The Opportunity We are seeking a highly experienced Senior Network Engineer to design, implement, operate, and support a complex enterprise network environment. This role requires deep expertise in ...

jobr.pro

Senior Cloud Network Engineer The Senior Cloud Network Engineer's responsibility is to design, implement and manage scalable, secure, and high‑performance hybrid cloud network architectures. This ...

Geotab

Senior Network Engineering

Oakville, ON

Geotab is seeking a Senior Network Engineer who will serve as the subject matter expert for all corporate, data center, and cloud-based networks - leading the design, implementation, and support of ...

Tenstorrent

Sr. Network Engineer

Toronto, ON · Hybrid

CA$100K - CA$500K/yr

As our AI infrastructure continues to scale, we're looking for a Network Engineer to help design, deploy, and operate the networking backbone powering Tenstorrent's global AI compute infrastructure.

Alstom

Network Engineer

Toronto, ON · On-site

CA$90K - CA$115K/yr

Could you be the full-time Network Engineer in Toronto, ON, we're looking for? Your future role ... Experience with network security, policies, and routing protocols (e.g., IP or SR MPLS) * Hands-on ...

next page

Showing results 1-20

All JobsCore Network Engineer JobsSenior Core Network Engineer JobsSenior Core Network Engineer Jobs in Ontario

Senior Core Network Engineer information

What is a senior core network engineer?

Senior Core Network Engineers are experienced professionals responsible for designing, implementing, managing, and optimizing the core components of an organization's network infrastructure. They focus on ensuring high availability, security, and performance of critical network systems such as routers, switches, and firewalls. These engineers often lead network projects, troubleshoot complex issues, and mentor junior staff. Their expertise is essential for maintaining seamless connectivity and supporting business operations.

What are common challenges faced by senior core network engineers, and how can they be addressed?

Senior Core Network Engineers often encounter challenges such as managing complex network architectures, ensuring minimal downtime during upgrades, and addressing security vulnerabilities in real time. Staying current with rapidly evolving technologies and vendor solutions is crucial to maintaining network performance and security. To address these challenges, engineers typically collaborate closely with cross-functional teams, participate in ongoing training, and implement robust change management processes to ensure seamless network operations.

What is the difference between Senior Core Network Engineer vs Network Operations Center (NOC) Engineer?

AspectSenior Core Network EngineerNetwork Operations Center (NOC) Engineer
CertificationsCCNP, CCIE, Cisco certificationsCompTIA Network+, Cisco CCNA
Work EnvironmentDesign, implementation, and troubleshooting core network infrastructureMonitoring, incident response, and network maintenance
Employer & Industry UsageTelecom, large enterprises, ISPsService providers, enterprise networks, managed service providers

The Senior Core Network Engineer focuses on designing and maintaining core network infrastructure, requiring advanced certifications and technical expertise. In contrast, a NOC Engineer primarily monitors network performance, responds to incidents, and ensures network uptime. Both roles are vital in network operations but differ in scope and responsibilities.

What skills and qualifications are needed to be a senior core network engineer?

To thrive as a Senior Core Network Engineer, you need in-depth knowledge of network architecture, routing and switching protocols, and a degree in computer science or a related field, often with several years of relevant experience. Expertise in tools and systems such as Cisco IOS, Juniper JUNOS, MPLS, BGP, OSPF, and relevant certifications like CCNP or CCIE are typically required. Strong analytical thinking, problem-solving, and effective communication skills help you excel in troubleshooting and collaborating with cross-functional teams. These skills and qualifications are crucial for ensuring reliable, high-performance network operations and supporting complex organizational needs.
What are the most commonly searched types of Core Network Engineer jobs in Ontario? The most popular types of Core Network Engineer jobs in Ontario are:
What cities in Ontario are hiring for Senior Core Network Engineer jobs? Cities in Ontario with the most Senior Core Network Engineer job openings:
Senior Core Network Engineer jobs near you
Infographic showing various Senior Core Network Engineer job openings in Ontario as of August 2026, with employment types broken down into 1% As Needed, 81% Full Time, 15% Part Time, and 3% Contract. Highlights an 92% Physical, 3% Hybrid, and 5% Remote job distribution.

Senior Network Engineer

NTT Ltd.

Toronto, ON • Hybrid

Full-time

Re-posted 5 days ago

Job description

Make an impact with NTT DATA
Join a company that is pushing the boundaries of what is possible. We are renowned for our technical excellence and leading innovations, and for making a difference to our clients and society. Our workplace embraces diversity and inclusion - it's a place where you can grow, belong and thrive.

Position Overview:

We are seeking an experienced and talented Senior Network Engineer to join our team.

Senior Network Engineer responsibilities include managing and optimizing in-house and cloud-based networks, developing and implementing network security protocols, and troubleshooting network issues. You have extensive experience managing a hybrid network (Azure preferred) that is highly available and fault tolerant. Experience with and an expert understanding of firewalls is a must.

The primary goal of the Senior Network Engineer is to ensure the smooth operation of the network infrastructure to provide maximum performance and availability for the system users. This position is expected to be the subject matter expert and "go to" individual on the team to troubleshoot complex problems nobody else can solve.

Our ideal candidate is cool under pressure, an expert problem solver, highly motivated, a team player but also able to work independently, and is someone that is constantly looking for ways to make improvements and isn't afraid to bring those suggestions forward.

Responsibilities:
  • Design and deploy functional networks (LAN, WAN, WLAN)
  • Configure and install various network devices and services (e.g., routers, switches, firewalls, load balancer, VPN, QoS)
  • Perform network maintenance and system upgrades including service packs, patches, hot fixes, and security configurations
  • Perform cost estimation and identify mechanisms for cost control and containment
  • Monitor performance and ensure system availability and reliability
  • Monitor system resource utilization, trending and capacity planning
  • Work within established configuration and change management policies to ensure awareness, approval and success of changes made to the network infrastructure
  • Select and implement security tools, policies, and procedures in conjunction with the company's security team
  • Liaise with vendors and other IT personnel for problem resolutions
  • Ensure security and compliance with policies and procedures
  • Provide technical support and troubleshooting to resolve network related issues
  • Stay updated with the latest trends in networking
  • Document and maintain network environment configurations and diagrams
  • Provide assistance and mentoring to other IT team members
Qualifications:

Must Have

  • 10+ years of experience as a Network Engineer
  • 5+ years of experience in a senior role
  • Deep understanding of network protocols (e.g., IPSEC, HSRP, BGP, OSPF, 802.11, QoS)
  • Solid understanding of the OSI or TCP/IP model
  • Hands-on experience with monitoring, network diagnostics and network analytics tools
  • Advanced troubleshooting skills
  • Experience with both on-premises and cloud (Azure preferred) networks
  • Experience deploying, managing, and troubleshooting firewalls
  • Experience deploying, managing, and troubleshooting VPN IPSEC tunnels
  • Professional certifications in networking
  • Effective communication skills (written and verbal)

Would be a Plus

  • Experience deploying, managing, and troubleshooting an IPS/IDS
  • Experience with Fortinet network devices and firewalls
  • Experience designing and managing networks to optimize VoIP traffic
  • Experience with F5 BigIP devices
  • Bachelor's degree in Computer Science, Engineering, or a relevant field

This is a home office-based position, with some travel for company/salesmeetings as well as to client sites. Flexibility to work outside of standard 9am-6pm local time zone hours may be required at times to support this global team.

Target Base Salary: $90,000K-$100,000K (based on experience) plus variable commissions.

NTT Business Process Outsourcing is an equal opportunity employer and welcomes and encourages applications from people with disabilities. Accommodations are available on request for candidates taking part in all aspects of the selection process.

Workplace type:

About NTT DATA
NTT DATA is a $30+ billion business and technology services leader, serving 75% of the Fortune Global 100. We are committed to accelerating client success and positively impacting society through responsible innovation. We are one of the world's leading AI and digital infrastructure providers, with unmatched capabilities in enterprise-scale AI, cloud, security, connectivity, data centers and application services. Our consulting and industry solutions help organizations and society move confidently and sustainably into the digital future. As a Global Top Employer, we have experts in more than 50 countries. We also offer clients access to a robust ecosystem of innovation centers as well as established and start-up partners. NTT DATA is part of NTT Group, which invests over $3 billion each year in R&D.

Equal Opportunity Employer
NTT DATA is proud to be an Equal Opportunity Employer with a global culture that embraces diversity. We are committed to providing an environment free of unfair discrimination and harassment. We do not discriminate based on age, race, colour, gender, sexual orientation, religion, nationality, disability, pregnancy, marital status, veteran status, or any other protected category. Join our growing global team and accelerate your career with us. Apply today.

Third parties fraudulently posing as NTT DATA recruiters

NTT DATA recruiters will never ask job seekers or candidates for payment or banking information during the recruitment process, for any reason. Please remain vigilant of third parties who may attempt to impersonate NTT DATA recruiters-whether in writing or by phone-in order to deceptively obtain personal data or money from you. All email communications from an NTT DATA recruiter will come from an @nttdata.com email address. If you suspect any fraudulent activity, please contact us.

Apply