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Mainframe Developer Jobs in Seattle, WA (NOW HIRING)

Casne Engineering, Inc.

Software Developer II

Bellevue, WA · Remote

$90K - $120K/yr

We are seeking a highly skilled and motivated Software Developer with strong proficiency in Python and SQL to join our dynamic development team. This role is ideal for someone who thrives as both in ...

Onramp Lab

Developer

Seattle, WA · On-site +1

We are seeking a skilled Developer to join our technical team. The ideal candidate will play a key role in building, maintaining, and enhancing our software products and applications. You will ...

AditiStaffing

Software Developer

Snoqualmie, WA · On-site

Role: Software Developer Location: Snoqualmie, WA - 4-6 years Application Development Experience including the skills outline below - Unix, Redhat preferred, light admin experience - Shell ...

Nastech Global

Technology Developer

Seattle, WA · On-site

Technology Developer Location: Seattle, WA(Onsite) Job Type: Full Time Must Have : Python, PowerShell, Bash, Java, JavaScript, Power Automate, GitLab Good to have : LowCode/No Code, Blue Prism ...

Novinium

Software Developer

Kent, WA · On-site

As part of our IT team the Software Developer is responsible for creating new software products while updating and maintaining existing products to enable Novinium to maintain its technological edge.

Oracle

Software Developer 5

Seattle, WA

Domain-specific processors and programmable hardware accelerators are becoming central to modern cloud infrastructure, especially as data centers evolve to support AI-ready, efficient, and ...

Oracle Corporation

Software Developer 5

Seattle, WA · On-site

Domain-specific processors and programmable hardware accelerators are becoming central to modern cloud infrastructure, especially as data centers evolve to support AI-ready, efficient, and ...

Oracle

Software Developer 5

Seattle, WA · On-site

Domain-specific processors and programmable hardware accelerators are becoming central to modern cloud infrastructure, especially as data centers evolve to support AI-ready, efficient, and ...

Oracle

Software Developer 5

Seattle, WA · On-site

Domain-specific processors and programmable hardware accelerators are becoming central to modern cloud infrastructure, especially as data centers evolve to support AI-ready, efficient, and ...

Columbia Distributing

Software Developer

Kent, WA · On-site

Summary The Software Developer designs, builds, and maintains the organization's internal software applications with a meaningful degree of independence. This role takes ownership of moderately ...

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All JobsMainframe Developer JobsMainframe Developer Jobs in Seattle, WA

Mainframe Developer information

See Seattle, WA salary details

$11

$60

$82

How much do mainframe developer jobs pay per hour?

As of Jul 23, 2026, the average hourly pay for mainframe developer in Seattle, WA is $60.74, according to ZipRecruiter salary data. Most workers in this role earn between $53.61 and $68.94 per hour, depending on experience, location, and employer.

What is the difference between Mainframe Developer vs Mainframe Analyst?

AspectMainframe DeveloperMainframe Analyst
Primary RoleDesigning, coding, and testing mainframe applicationsAnalyzing and maintaining existing mainframe systems
Skills & CertificationsCOBOL, JCL, DB2, certifications like IBM Certified DeveloperCOBOL, JCL, system analysis, troubleshooting skills
Work EnvironmentDevelopment teams, coding in mainframe environmentsSupport teams, system analysis, user support
Industry UsageFinancial services, insurance, government agenciesFinancial institutions, healthcare, government agencies

While Mainframe Developers focus on creating and implementing mainframe applications, Mainframe Analysts primarily analyze, troubleshoot, and maintain existing systems. Both roles require similar technical skills and often work within the same industries, but their core responsibilities differ in development versus support and analysis.

What are some common challenges Mainframe Developers face when integrating legacy systems with modern applications?

Mainframe Developers often encounter challenges such as ensuring compatibility between legacy systems and newer technologies, managing data migration without disrupting business operations, and maintaining the security of sensitive data. Effective communication with cross-functional teams, such as application developers and infrastructure engineers, is essential to address these challenges. Staying updated on both mainframe and modern programming practices helps ease integration and ensures long-term system reliability.

What are Mainframe Developers?

Mainframe Developers are specialized software engineers who design, develop, maintain, and troubleshoot applications on mainframe computer systems, such as IBM's z/OS. They typically work with languages like COBOL, JCL, and CICS, and are responsible for ensuring the performance, security, and reliability of mission-critical business applications. Mainframe Developers are commonly employed in industries like banking, insurance, and government, where large-scale, high-volume transaction processing is essential.

What are the key skills and qualifications needed to thrive as a Mainframe Developer, and why are they important?

To thrive as a Mainframe Developer, you need expertise in programming languages such as COBOL, JCL, and SQL, along with a strong understanding of mainframe operating systems and batch processing concepts. Familiarity with tools like IBM z/OS, DB2, CICS, and version control systems is typically required, and certifications from IBM or related organizations can be beneficial. Strong problem-solving abilities, attention to detail, and effective communication skills help Mainframe Developers excel in troubleshooting and collaborating with cross-functional teams. These skills are crucial for maintaining, optimizing, and modernizing legacy systems that are vital to many large organizations’ operations.
What are the most commonly searched types of Mainframe Developer jobs in Seattle, WA? The most popular types of Mainframe Developer jobs in Seattle, WA are:
What are popular job titles related to Mainframe Developer jobs in Seattle, WA? For Mainframe Developer jobs in Seattle, WA, the most frequently searched job titles are:
What job categories do people searching Mainframe Developer jobs in Seattle, WA look for? The top searched job categories for Mainframe Developer jobs in Seattle, WA are:
Mainframe Developer jobs near you
Infographic showing various Mainframe Developer job openings in Seattle, WA as of July 2026, with employment types broken down into 82% Full Time, 5% Part Time, 1% Temporary, and 12% Contract. Highlights an 83% Physical, 4% Hybrid, and 13% Remote job distribution, with an average salary of $126,349 per year, or $60.7 per hour.
Software Developer II

Software Developer II

Casne Engineering, Inc.

Bellevue, WA • Remote

$90K - $120K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 27 days ago

Job description

We are seeking a highly skilled and motivated Software Developer with strong proficiency in Python and SQL to join our dynamic development team. This role is ideal for someone who thrives as both in individual or team contributor and is passionate about building unique solutions in a fast-paced environment for Industrial Infrastructure and Data Analytics.

Key Responsibilities

  • Design, develop, and maintain backend systems using Python and SQL.
  • Collaborate with cross-functional teams to define, design, and ship new features.
  • Optimize applications bases upon customer feedback.
  • Participate in code reviews and contribute to best practices.
  • Troubleshoot, debug, and upgrade existing software.
  • Document development processes, code changes, and technical specifications.
  • Work on a blend of Research & Development and client-facing projects as company needs fluctuate

Required Skills

  • Python – Strong proficiency required
  • SQL – Strong proficiency required
  • Java – Experience with backend development

Preferred / Nice-to-Have Skills

  • Jython – Familiarity
  • JavaScript – Client-side development experience
  • Front-End Frameworks – Familiarity with React or Angular
  • UI/UX Implementation – Experience translating designs into functional interfaces
  • SCADA Systems – Experience in designing, programming in, or developing integrations for SCADA systems

Qualifications

  • Bachelor’s degree in Computer Science, Engineering, or related field (or equivalent experience)
  • Demonstrated history of feature or project ownership/technical leadership.
  • 4+ years of professional software development experience
  • Strong problem-solving and communication skills
  • Ability to work independently and in a team environment
  • Strong collaboration skills; a team player who isn’t afraid to ask questions

Additional Compensation:

  • End of Year Bonus (Discretionary, based upon individual contributions to profitability, target: 10% of base pay)
  • Monthly Bonuses (Discretionary, based upon individual effort beyond expected, 0-3% typical)
  • ESOP stock (Discretionary, 5% typical, 1 year for eligibility) - Casne is an employee-owned company with qualified ESOP retirement plan.
  • 401k Matching (50% match on up to 8% earnings)

Company Description

Founded in 1979, Casne is an employee-owned, full-service electrical and technology firm with offices in Bellevue, WA and Carlsbad, CA. We deliver high-quality engineered and information systems from concept to design, implementation and on through continued support. Our goal is to assist our clients, who range from small to Fortune 500 companies, achieve operational excellence through improvements to their critical electrical and technology infrastructures.
Casne prides itself on accepting the challenges of our clients and then exceeding their expectations. We offer competitive pay, employment stability, and a comfortable work setting with an energetic team of dedicated professionals. Hybrid work arrangements may be possible depending on project responsibilities. Full-time benefits include health insurance, 401k, Employee Stock Ownership Plan (ESOP), potential equity ownership, performance bonuses, educational reimbursement, HSA/flexible spending, and other fringe benefits.