H-1B Visa Senior Mainframe Developer Jobs
Senior Mainframe Developer roles qualify as H-1B specialty occupations under USCIS standards, requiring at least a bachelor's degree in computer science or a related field. Financial services, insurance, and government contractors are the heaviest sponsors. Petition cap deadlines and prevailing wage levels vary by location and employer size.
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Get Access To All JobsWork 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.
Position Summary
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 Responsibilities
- Design, 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
Required Qualifications
- 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)
Preferred Qualifications
-
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)
Work Environment
- Hybrid work model: Onsite at least 3 days per week
- Participation in an on-call rotation, including weekends and off-hours support
What Success Looks Like
- 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
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.
Position Summary
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 Responsibilities
- Design, 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
Required Qualifications
- 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)
Preferred Qualifications
-
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)
Work Environment
- Hybrid work model: Onsite at least 3 days per week
- Participation in an on-call rotation, including weekends and off-hours support
What Success Looks Like
- 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
See all Senior Mainframe Developer jobs
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Get Access To All JobsTips for Finding H-1B Visa Sponsorship as a Senior Mainframe Developer
Verify your SOC code before applying
Senior Mainframe Developer roles typically file under SOC 15-1252 (Software Developers). Confirm the employer's LCA uses this code before signing an offer. A mismatched code can trigger DOL scrutiny and delay certification.
Target industries with mainframe-dependent operations
Banks, insurance carriers, federal contractors, and healthcare payers run legacy COBOL and z/OS environments that newer graduates can't support. These employers file H-1B petitions annually because qualified candidates are scarce and turnover risk is high.
Check prevailing wage levels using OFLC Wage Search
Mainframe roles often land at wage Level III or IV due to the specialized skill set. Run the OFLC Wage Search for your target metro before negotiating so you know the DOL floor your employer must certify to.
Use Migrate Mate to filter verified H-1B sponsors
Search Migrate Mate to identify employers with confirmed LCA filing history for mainframe and systems developer roles. This filters out employers who list H-1B sponsorship as optional but have no actual filing track record.
Prepare documentation of legacy system experience early
USCIS specialty occupation RFEs for mainframe roles often challenge whether the position requires a degree. Assembling your project history, architecture documents, and employer attestations before filing strengthens the petition against that challenge.
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Find Senior Mainframe Developer JobsSenior Mainframe Developer H-1B Visa: Frequently Asked Questions
Does a Senior Mainframe Developer role qualify as an H-1B specialty occupation?
Yes. USCIS classifies Senior Mainframe Developer positions as specialty occupations because they require at least a bachelor's degree in computer science, information systems, or a closely related field. The specialized nature of z/OS, COBOL, and JCL environments reinforces the degree requirement, which is the core test USCIS applies. Employers should document this clearly in the petition to reduce RFE risk.
Which industries sponsor H-1B visas most often for mainframe developers?
Financial services, insurance, healthcare payers, and federal government contractors are the most consistent H-1B sponsors for mainframe roles. These sectors run mission-critical legacy systems that require ongoing development and maintenance by specialists. Mainframe skills are rare enough that these employers cannot easily source qualified candidates domestically, which drives their sponsorship activity. Migrate Mate lets you filter employers by verified LCA filing history in this occupation.
What prevailing wage level applies to Senior Mainframe Developer positions?
Most Senior Mainframe Developer roles are certified at DOL wage Level III or Level IV, reflecting the combination of technical depth and seniority. The exact level depends on the job duties, years of experience required, and geographic location. You can verify the applicable wage for any metro using the OFLC Wage Search before evaluating an offer or accepting a position.
Can I use my mainframe work experience to substitute for a bachelor's degree on an H-1B petition?
USCIS allows three years of specialized work experience to substitute for one year of a four-year degree, so 12 years of directly relevant mainframe experience can satisfy the bachelor's degree equivalent requirement. However, the experience must be evaluated by a credentials assessment organization and documented in detail. This path adds complexity to the petition and makes thorough evidence preparation especially important.
How do I identify employers actively sponsoring H-1B visas for mainframe roles?
The most reliable method is reviewing DOL Labor Condition Application disclosure data, which shows which employers have filed LCAs for mainframe and systems developer job titles. This is public record and reflects actual filing intent rather than a recruiting claim. Migrate Mate surfaces this LCA data by employer and occupation, so you can target companies with a real history of sponsoring candidates in this field rather than relying on job postings alone.
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