[Skip to main content](#main-content)

[OpenNash Jobs](https://jobs.opennash.com/)
[Hiring report](/reports/hiring/) · [All Thermo Fisher Scientific jobs](https://jobs.opennash.com/companies/thermo-fisher-scientific/) · [Search jobs](/search/)

Thermo Fisher Scientific · Ottawa, Ontario, Canada

# Senior Mainframe Developer

Ottawa, Ontario, Canada Full-time Senior individual contributor Software Engineering 

Listed on Thermo Fisher Scientific’s official careers site. Posted June 29, 2026. Check that it is still open and apply there.
[Apply on Thermo Fisher Scientific’s careers site →](https://jobs.thermofisher.com/global/en/job/TFSCGLOBALR01355055EXTERNALENGLOBAL/Senior-Mainframe-Developer)

[OpenNash Jobs](https://jobs.opennash.com/) / [Thermo Fisher Scientific](https://jobs.opennash.com/companies/thermo-fisher-scientific/) / Senior Mainframe Developer

The employer’s listing has no description we could read. See it on their site.

## At a glance
- Posted by the employer: Jun 29, 2026
- First seen by OpenNash: Aug 20, 2026
- Last checked: Oct 13, 2026
- Listed for: 106 days
- Location: Ottawa, Ontario, Canada
- Employment type: Full-time[Apply on Thermo Fisher Scientific’s careers site →](https://jobs.thermofisher.com/global/en/job/TFSCGLOBALR01355055EXTERNALENGLOBAL/Senior-Mainframe-Developer)

## More jobs at Thermo Fisher Scientific

### [Sr. Purchasing Coordinator](https://jobs.opennash.com/companies/thermo-fisher-scientific/jobs/67c83b6d1ff214b11f1f/)

Ottawa, Ontario, Canada

### [AI Software Engineer](https://jobs.opennash.com/companies/thermo-fisher-scientific/jobs/d83963294547cd9c840b/)

Gangnam-gu, Seoul, Korea, Republic of

### [AI/ML Developer](https://jobs.opennash.com/companies/thermo-fisher-scientific/jobs/f60185a64ca8ad657c4d/)

Quezon City, Philippines

### [AVI Software & Vision Systems Trainer](https://jobs.opennash.com/companies/thermo-fisher-scientific/jobs/e4dfb2d13cbdd80daaa4/)

Greenville, North Carolina, United States of America

### [Associate Systems Developers](https://jobs.opennash.com/companies/thermo-fisher-scientific/jobs/5505ed67b64b1d01cafb/)

Bangalore, Karnātaka, India

## Similar jobs at other companies

### [Mainframe Developer - C10](https://jobs.opennash.com/companies/citigroup/jobs/7288513a23f6abb32c92/)

Citigroup 

### [Cobol Mainframe Developer](https://jobs.opennash.com/companies/ntt/jobs/413f0f101a2775cb755c/)

NTT · Lima, Peru

### [Mainframe Software Developer](https://jobs.opennash.com/companies/canadian-pacific-kansas-city/jobs/4c1b0bee7f4505598999/)

Canadian Pacific Kansas City · Calgary, AB, CAN

### [Mainframe Developer](https://jobs.opennash.com/companies/tata-consultancy-services/jobs/ee08cc5d8474ff29e773/)

Tata Consultancy Services · Chennai

### [Mainframe Developer](https://jobs.opennash.com/companies/tata-consultancy-services/jobs/c9656677b4aa433b9197/)

Tata Consultancy Services · Hyderabad

OpenNash lists jobs from employers’ own careers sites and does not handle applications.
Dates come from the employer where stated; “first seen” and “last checked” are our own observations.

OpenNash Jobs · Official listings with dates and links to the employer. [Weekly hiring report](/reports/hiring/) · [Methodology](/methodology/)