Work Schedule
Standard (Mon-Fri)Environmental Conditions
OfficeJob 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.
DESCRIPTION:
We are seeking a Senior Mainframe Developer to design, develop, and support critical enterprise applications in a complex mainframe environment. This role requires deep technical expertise in COBOL-based systems, strong problem-solving skills, and the ability to contribute to modernization initiatives, including API enablement and integration with distributed platforms.
This individual will play a key role in ensuring system reliability, driving technical improvements, and partnering with cross-functional teams to deliver high-quality solutions.
Key ResponsibilitiesDesign, develop, test, and maintain applications using COBOL, CICS, VSAM, and IDMS
Analyze business requirements and translate them into scalable, maintainable technical solutions
Support and enhance legacy systems while contributing to modernization and transformation efforts
Develop and expose APIs and services to enable integration between mainframe and distributed systems
Participate in production support, including root cause analysis and issue resolution
Provide on-call support, including weekends and off-hours, as part of a rotation
Collaborate with Product Managers, Business Analysts, QA, and other engineering teams
Lead or contribute to code reviews, technical design sessions, and best practice development
Identify opportunities for process improvement, automation, and performance optimization
Mentor junior developers and provide technical guidance across the team
Ensure adherence to security, compliance, and development standards
7+ years of experience in mainframe application development
Strong hands-on experience with:
COBOL
CICS
VSAM
IDMS
Easytrieve
Experience with batch and online processing environments
Proven experience supporting mission-critical production systems
Strong debugging, analytical, and problem-solving skills
Experience working in Agile or Scrum environments
Excellent communication skills, with the ability to work across technical and business teams
Willingness to participate in on-call rotation (weekends and off-hours)
Experience with mainframe modernization initiatives
API enablement (e.g., REST services, z/OS Connect, etc.)
Integration with cloud or distributed platforms
Familiarity with DevOps practices and CI/CD pipelines in a mainframe context
Experience with performance tuning and system optimization
Exposure to tools such as Endevor, Changeman, or similar
Experience working in hybrid environments (mainframe + distributed systems)
Hybrid work model: Onsite at least 3 days per week
Participation in an on-call rotation, including weekends and off-hours support
Delivers high-quality, reliable code in a complex legacy environment
Drives incremental modernization while maintaining system stability
Acts as a technical leader and trusted partner to stakeholders
Improves team velocity through better design, automation, and collaboration
What We Do
Thermo Fisher Scientific Inc. is the world leader in serving science, with annual revenue of approximately $40 billion. Our Mission is to enable our customers to make the world healthier, cleaner and safer. Whether our customers are accelerating life sciences research, solving complex analytical challenges, increasing productivity in their laboratories, improving patient health through diagnostics or the development and manufacture of life-changing therapies, we are here to support them. Our global team delivers an unrivaled combination of innovative technologies, purchasing convenience and pharmaceutical services through our industry-leading brands, including Thermo Scientific, Applied Biosystems, Invitrogen, Fisher Scientific, Unity Lab Services, Patheon and PPD.
Why Work With Us
You will join a company which every colleague has the opportunity to create possibilities, for oneself, for our customers and patients. There is no more exciting place to be than at the forefront of solving problems which help improve lives around the world. As a company, we are committed to supporting your career aspirations and your journey.
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