Mainframe Network Engineer
Travelers· enterprise· Insurance· Oct 1, 2026 · 27d ago
Hartford, CT
In office
Full-time
Mid
$94K–$156K
3+ years exp
Job description
Who Are We? Taking care of our customers, our communities and each other. That’s the Travelers Promise. By honoring this commitment, we have maintained our reputation as one of the best property casualty insurers in the industry for over 170 years. Join us to discover a culture that is rooted in innovation and thrives on collaboration. Imagine loving what you do and where you do it.
Job Category
Technology
Compensation Overview The annual base salary range provided for this position is a nationwide market range and represents a broad range of salaries for this role across the country. The actual salary for this position will be determined by a number of factors, including the scope, complexity and location of the role; the skills, education, training, credentials and experience of the candidate; and other conditions of employment. As part of our comprehensive compensation and benefits program, employees are also eligible for performance-based cash incentive awards.
Salary Range $94,400.00 - $155,800.00
Target Openings
1
What Is the Opportunity?
Travelers is seeking a Mainframe Network Engineer to join our organization as we grow and transform our Enterprise Technology Solutions organization, Our Infrastructure Engineers serve as a foundational cornerstone of the enterprise technology ecosystem, encompassing a diverse portfolio of critical systems that power all business operations. This discipline may include mainframe systems, compute resources, storage solutions, collaboration tools, and specialized platforms that enable system interoperability. As the bedrock layer of the technology stack, Infrastructure Engineering creates the resilient, secure, and scalable environments upon which all other technology services depend, balancing the maintenance of established systems with the adoption of modern cloud-native approaches to drive organizational agility and innovation. Applicants must be authorized to work for ANY employer in the US. The company does not sponsor/support H-1B petitions, TN, or Forms I-983/STEM OPT, this this role. What Will You Do? Responsible for performing analysis, design, and implementation of infrastructure components across various domains (which may include mainframe systems, collaboration tools, compute resources, storage solutions, or other specialized areas) with a high degree of accuracy.
Technical Execution:
Define and implement technical requirements for infrastructure provisioning, configuration management, and operational support using appropriate automation methodologies.
Enhance infrastructure deployment workflows to improve system reliability, resource utilization, and operational efficiency while resolving infrastructure issues of intermediate complexity.
Configure and optimize physical, virtualized, and cloud-based infrastructure to ensure high availability, performance, and operational resilience across multiple technology domains.
Implement and maintain infrastructure monitoring, capacity planning, and incident response procedures while ensuring adherence to security protocols and compliance requirements.
Strategic Input:
Collaborate with software, platform, and operations teams to align infrastructure capabilities with application requirements and business needs.
Provide technical guidance to Associate and Sr Associate Infrastructure Engineers while contributing to infrastructure standards and best practices.
Evaluate new infrastructure technologies and methodologies to identify opportunities for operational improvements and technology modernization.
Perform other duties as assigned.
What Will Our Ideal Candidate Have?
Technical Expertise & Education:
3 years of infrastructure engineering/systems administration experience preferred.
If specializing in a certain domain of infrastructure engineering, proven expertise in that specific area with ability to work across related systems.
Domain Expertise - Demonstrated track record of infrastructure expertise including the ability to understand system concepts necessary to do the job effectively, demonstrate willingness, cooperation, and concern for business issues, and possess in-depth knowledge of immediate infrastructure systems worked on.
Core Mainframe & Operating System Skills IBM z/OS: Deep proficiency in the z/OS Communications Server environment.
Protocols & Architecture: Hands-on experience with SNA (Systems Network Architecture), VTAM (Virtual Telecommunication Access Method), and APPN/Enterprise Extender for SNA-over-IP communication.
Environment Navigation: Familiarity with standard mainframe interfaces like TSO/ISPF, JCL (Job Control Language), and IOF (Interactive Output Facility.
Networking & Connectivity Skills TCP/IP Stack: Advanced configuration and management of the z/OS TCP/IP stack, routing protocols (OSPF, EIGRP), and Layer 2/Layer 3 integration.
Trace & Packet Analysis: Ability to execute and analyze complex VTAM network traces and sniffer/TCP/IP packet captures to isolate bottlenecks.
Infrastructure Integration: Working knowledge of modern enterprise hardware and software, including switches, firewalls, load balancers, and 3270 emulators.
Security & Policy Management Pagent & AT-TLS: Customization of the z/OS Policy Agent and Application Transparent Transport Layer Security for network policy and encryption rules.
Certificates & Encryption: Administration of digital certificates, keyrings, SSH, and SSL/TLS protocols.
Secure File Transfers: Support for enterprise file-moving tools like SFTP, FTPS, and Connect:Direct.
Automation, Scripting & Monitoring Scripting Languages: Competency in REXX, CLIST, Python, or Linux BASH for workflow automation and generating SMF (System Management Facilities) reports.
Diagnostic Tools: Experience utilizing IBM NetView, IBM or equivalent performance and capacity-planning tools.
Leadership & Influence:
Strong communication skills that enable clear, concise interactions with team members and stakeholders.
Your ability to document infrastructure work in an accessible manner, ask clarifying questions on requirements, and actively listen ensures seamless collaboration.
You welcome constructive feedback and use it to continuously improve your approach to infrastructure challenges.
You demonstrate intermediate leadership capabilities with a proven track record of self-motivation and initiative.
Your ability to identify and pursue personal growth opportunities in infrastructure technologies shows your commitment to professional development and positions you to take on increasing responsibilities within our team.
Strategic & Business Acumen:
Intermediate delivery skills including the ability to deliver infrastructure work at a steady, predictable pace to achieve commitments, decompose infrastructure assignments into small batch deployments, and contribute to system architecture tradeoff and negotiation discussions.
Proven problem-solving skills including infrastructure debugging abilities, allowing you to determine source of issues in unfamiliar systems or environments, ability to recognize and solve repetitive infrastructure problems proactively and permanently, recognize mistakes using them as learning opportunities, and break down large infrastructure problems into smaller, more manageable ones.
What is a Must Have? Bachelor’s degree in computer science, related STEM field, or its equivalent in work experience plus 2 years of infrastructure engineering experience.
What Is in It for You? Health Insurance : Employees and their eligible family members – including spouses, domestic partners, and children – are eligible for coverage from the first day of employment.
Retirement: Travelers matches your 401(k) contributions dollar-for-dollar up to your first 5% of eligible pay, subject to an annual maximum. If you have student loan debt, you can enroll in the Paying it Forward Savings Program. When you make a payment toward your student loan, Travelers will make an annual contribution into your 401(k) account. You are also eligible for a Pension Plan that is 100% funded by Travelers.
Paid Time Off: Start your career at Travelers with a minimum of 20 days Paid Time Off annually, plus nine paid company Holidays.
Wellness Program: The Travelers wellness program is comprised of tools, discounts and resources that empower you to achieve your wellness goals and caregiving needs. In addition, our mental health program provides access to free professional counseling services, health coaching and other resources to support your daily life needs.
Volunteer Encouragement: We have a deep commitment to the communities we serve and encourage our employees to get involved. Travelers has a Matching Gift and Volunteer Rewards program that enables you to give back to the charity of your choice.
Employment Practices Travelers is an equal opportunity employer. We value the unique abilities and talents each individual brings to our organization and recognize that we benefit in numerous ways from our differences.
In accordance with local law, candidates seeking employment in Colorado are not required to disclose dates of attendance at or graduation from educational institutions.
If you are a candidate and have specific questions regarding the physical requirements of this role, please send us an email so we may assist you.
Travelers reserves the right to fill this position at a level above or below the level included in this posting.
To learn more about our comprehensive benefit programs please visit careers.travelers.com .
Application prep
Use the role’s language and application details while tailoring your materials.
Keywords to mirror
python
- Platform
- workday
- Effort
- long
Benefits
Benefits detected in the listing.
Health Insurance
Vision
401(K)
Paid Time Off
Wellness
Professional Development