Work Schedule
Standard (Mon-Fri)

Environmental Conditions
Office

Job Description
As part of the Thermo Fisher Scientific team, you'll discover meaningful work that makes a positive impact on a global scale. Join our colleagues in bringing our Mission to life every single day to enable our customers to make the world healthier, cleaner and safer. We provide our global teams with the resources needed to achieve individual career goals while helping to take science a step beyond by developing solutions for some of the world's toughest challenges, like protecting the environment, making sure our food is safe or helping find cures for cancer.

We are seeking a Senior Mainframe Developer to join our Ottawa-based engineering team supporting the development, enhancement, modernization, and production stability of critical applications. This role is ideal for a hands-on mainframe professional who can take ownership of end-to-end delivery, quickly learn complex business and technical domains, lead design discussions, solve production and delivery challenges, and mentor other team members. The successful candidate will bring deep experience with COBOL-based mainframe applications and related technologies, strong analytical and troubleshooting skills, and the ability to partner effectively with business stakeholders, architects, QA, support teams, and global delivery partners. This is a senior role for someone who combines technical depth, strategic solution thinking, accountability, curiosity, and a strong team-first mindset.

Key Responsibilities

Lead the design, development, testing, implementation, and maintenance of applications using COBOL, CICS, JCL, VSAM, IDMS and SORT utilities

Own and drive end-to-end delivery of projects, enhancements, defects, and production fixes, ensuring quality, timeliness, and business alignment

Analyze business requirements and translate them into scalable, maintainable, and reliable technical solutions

Prepare technical design documents, impact assessments, implementation plans, data flow analysis, and interface specifications

Collaborate with business stakeholders to understand requirements, identify risks, and propose practical and strategic solutions

Mentor and guide junior and intermediate developers, conduct code reviews, and promote engineering standards and best practices

Act as a trusted technical resource for application knowledge, design guidance, code quality, troubleshooting, and delivery risk management

Lead troubleshooting, root-cause analysis, and resolution of complex production issues,



ensuring minimal business impact

Lead or contribute to modernization and integration initiatives, including impact assessment, interface design, data flow analysis, API or middleware integration, and safe migration strategies

Participate in and support release planning, deployment, post-production validation, and operational readiness activities

Participate in an on-call support rotation, including occasional weekends or off-hours

Ensure adherence to development standards, documentation, security, audit, and compliance requirements

Collaborate effectively with global teams, including onshore, offshore, business, QA, infrastructure, architecture, support, and cross-functional partners

Proactively identify risks, dependencies, technical debt, and opportunities to improve system stability, delivery effectiveness, and team capability

Required Qualifications
Bachelor's Degree holder with 8+ years of hands-on Mainframe application development experience

Strong hands-on expertise in:

COBOL

CICS

JCL

VSAM

IDMS/DB2

SORT utilities

Excellent understanding of designing and developing applications in Mainframe technologies

Strong experience supporting both batch and online mainframe applications

Robust solutioning mindset with ability to design and implement technical solutions

Demonstrated ownership mindset with the ability to work through ambiguity, proactively identify risks, and drive issues to closure

Ability to quickly learn complex legacy applications, business processes, data flows, and integration points

Willing to provide application support as needed and on rotation

Ability to collaborate with multiple business teams and solve complex issues

Strong analytical and problem-solving abilities

Excellent communication, collaboration, and stakeholder-management skills

Experience with enterprise systems integration

Knowledge of security best practices and compliance requirements

Ability to work independently and as part of a distributed team

Strong team orientation with the ability and willingness to mentor team members and raise overall team capability

Preferred Qualifications

Exposure to RPG





Experience with Lotus Notes application development or support

Understanding of API development, integration, or modernization strategies

Experience with MQ, middleware, file-transfer patterns, or enterprise integration approaches

Familiarity with Agile/Scrum methodologies

Experience working inorder management, fulfillment, supply chain, finance, or other high-volume transactional systems

Strong experience in production support and incident management

Experience with tools such as TSO/ISPF, File-AID, Xpediter, Endevor, Changeman, Control-M, CA7, or similar mainframe development and scheduling tools

Experience working with globally distributed teams, including onshore, offshore, and cross-functional delivery partners

Work Environment

Location: Ottawa, Canada

Work Model: Hybrid work model with a combination of onsite and work from home, as defined by team and business needs

Support Expectations: Participation in a shared on-call rotation, including occasional weekends or off-hours support

What Success Looks Like
The successful candidate will:

Successfully leads projects and delivers high-quality, scalable, and maintainable solutions

Provides effective design solutions aligned with business needs, system architecture, and long-term technology direction

Acts as a technical mentor and go-to person for application knowledge, design guidance, code quality, troubleshooting, and delivery risk management

Demonstrates strong leadership, ownership and accountability in delivery and production support

Engages proactively with business stakeholders and adds value in discussions

Quickly learns complex systems, business processes, and technical dependencies

Identifies risks, technical debt, and improvement opportunities before they become delivery or production issues

Continuously learns, explores new approaches, and drives problem-solving initiatives

Contributes to team success, system stability, and modernization efforts

Supports a positive, collaborative, and team-first culture by sharing knowledge, mentoring others, and helping the team succeed

Compensation
The estimated annualized pay range for this position in Ontario is $85,500.00-$114,000.00.

Thermo Fisher Scientific is an EEO/Affirmative Action Employer and does not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, protected veteran status, disability or any other legally protected status.

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📌 Senior Mainframe Developer (Quebec City)
🏢 ThermoFisher Scientific
📍 Quebec City