Mainframe Assembler Developer

Job Description
Job Title: Mainframe Assembler Developer

Location: Toronto

Experience

Required:

6–8 Years

Role Summary

We are seeking an experienced Mainframe Assembler Developer with strong production support capabilities and deep expertise in Mainframe Assembler (MVS), JCL, and enterprise batch processing
.

The ideal candidate will independently analyze, design, develop, and troubleshoot Mainframe-based applications while supporting mission-critical production environments
.

Key Responsibilities
Technical Responsibilities

• Conduct independent analysis and assessment to resolve Mainframe programming issues.

• Design, develop, modify, and maintain Assembler (MVS) programs and JCL to support application and project requirements.

• Perform production support activities including troubleshooting, defect resolution, performance optimization, and incident handling.

• Support system enhancements, product upgrades, and new development initiatives.

Production & Operational Support

• Provide on-call support on a rotational basis for critical applications.

• Execute production tasks to ensure timely, accurate, and efficient service delivery.

• Track milestones, operational metrics, and issue progress; recommend solutions and escalate when necessary.

• Independently manage non-routine situations and resolve technical challenges with minimal oversight.

Stakeholder & Cross-Functional Collaboration

• Build strong working relationships with internal and external stakeholders.

• Communicate application impacts, risks, and recommendations clearly to stakeholders and leadership.

Required Skills & Qualifications

• Strong hands-on coding experience in Mainframe Assembler (MVS).

• Expertise in JCL design and maintenance
  .

• Experience supporting and maintaining Mainframe production applications
  .

• Ability to work independently on complex and non-routine issues.

• Strong communication, collaboration, and analytical skills
  .

• Proven data-driven decision-making capabilities.

• Typically 5–7 years of relevant IT experience plus a technology-related degree or equivalent combination of education and experience.

Core Competencies

• Communication
  
  Skills:
  
  Strong written and verbal communication for technical and non-technical audiences.

• Collaboration & Teamwork: Ability to partner effectively with cross-functional teams and stakeholders.

• Analytical & Problem-Solving: Skilled in diagnosing complex Mainframe issues with accuracy.

• Influence
  
  Skills:
  
  Able to influence decisions and outcomes through technical expertise.

• Data-Driven Decision Making: Applies analytical insights to drive recommendations and actions.

Desirable Skills (Optional)

• Knowledge of DB2 and enterprise batch scheduling.

• Experience with
  modernization initiatives or cross-platform integration/migration projects.

Requirements
Experience (Years): 4-6 Essential

Skills:

• Work with project teams throughout the organization to design, implement, and manage CDN infrastructure using Akamai, to ensure high availability, performance, and scalability for customer facing applications and business processes.
• Handle multiple priorities and assignments with excellence and precision.
• Be a part of a 24/7/365 organization (some after hours support is expected as part of normal on-call rotation).
• Directly support line of business development teams, provide guidance to them on implementation and changes for customer facing applications
• Develop and maintain security protocols and measures to protect CDN infrastructure from cyber threats.
• Monitor and analyze network performance, identifying and resolving issues to optimize content delivery of critical applications.
• Collaborate with cross-functional teams to integrate Akamai CDN solutions with existing systems and applications.
• Collaborate with information security teams to implement DDoS protection strategies and other security measures in the CDN.
• Provide technical support and guidance to clients and internal teams regarding CDN and security best practices.
• Work closely with vendor and professional service teams on delivery related activities and strategy.

Qualifications:

• Bachelor’s degree in Computer Science, Information Technology, or a related field. OR similar work experience.
• Strong understanding of network protocols (HTTP/HTTPS, DNS, TCP/IP).
• Proven experience as a CDN Engineer or similar role, with a strong focus on cybersecurity.
• In-depth knowledge of Content Delivery Network technologies, including caching, load balancing, and content optimization.
• Excellent problem-solving skills and attention to detail.
• Strong communication and teamwork abilities.
• Experience supporting 24/7/365 customer facing applications at enterprise scale.
• Awareness and experience with cybersecurity tools and practices, such as firewalls, intrusion detection/prevention systems, and encryption.
• Proficiency in scripting and automation (e.g., Python, Bash) a plus.
• Relevant certifications (e.g., CISSP, CEH) are a plus but not required.