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As of September 01, 2026, the average salary for a Mainframe Developer III in Illinois is $104,950 per year, which breaks down to an hourly rate of $50.
However, a Mainframe Developer III's salary can vary significantly. Here’s a look at the typical salary range:
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Mainframe Developer III Salaries by Percentile
| Annual Salary |
Monthly Pay |
Weekly Pay |
Hourly Wage |
|
| 75th Percentile | $113,590 | $9,466 | $2,184 | $55 |
| Average | $104,950 | $8,746 | $2,018 | $50 |
| 25th Percentile | $96,830 | $8,069 | $1,862 | $47 |
CapB InfoteK - Chicago, IL
4P Consulting Inc. - MOUNTAIN BROOK, AL
4P Consulting Inc. - FOREST PARK, GA
Solutions Technology / STI Health - ARLINGTON, TX
A Mainframe Developer III's salary isn't a fixed number. It's shaped by several important factors. Below, we'll explore how your years of experience, geographic location, and company size can directly affect your earning potential.
Experience is a primary driver of a Mainframe Developer III's salary. As you build your skills and take on more complex tasks, your compensation generally increases. Here's how the average salary grows at different career stages:
| Levels | Salary |
|---|---|
| Entry Level Mainframe Developer III | $101,310 |
| Intermediate Level Mainframe Developer III | $101,916 |
| Senior Level Mainframe Developer III | $103,128 |
| Specialist Level Mainframe Developer III | $107,527 |
| Expert Level Mainframe Developer III | $109,850 |
What Am I Worth?
Your salary can change significantly depending on where you work. States with a higher cost of living and strong industrial sectors often pay more to attract Mainframe Developer IIIs. For example, consider the average annual salaries in these key locations:
Salaries can also vary between different cities. Major metropolitan areas or cities with a high demand for technicians often offer more competitive pay. Here are a few examples of average annual salaries in different U.S. cities:
Mainframe Developer III salary potential scales significantly with company size. Data shows that Enterprise companies (5,000+ employees) pay the highest average salary at around $117,286. While startup companies pay approximate $99,212.
| Company Size | Employees | Average Salary |
|---|---|---|
| Startup | 1~50 | $99,212 |
| Growth Stage | 51~500 | $104,927 |
| Established | 501~5000 | $113,255 |
| Enterprise | 5000+ | $117,286 |
For Mainframe Developer III roles, the industry you choose can affect earning potential by as much as 50% (the gap between the highest and lowest paying industries). Data shows that the Financial Services and Internet sectors offer the strongest compensation, at 25% above the average. In contrast, Mainframe Developer positions in Transportation or Edu., Gov't. & Nonprofit typically offer lower base pay, as these industries often view Mainframe Developer III as a support function rather than a direct revenue driver.
| Industry Sector | Average Annual Salary | Average Hourly Rate | Pay vs.Avg |
|---|---|---|---|
| Financial Services | $131,188 | $63.0 | 25% |
| Internet | $125,940 | $61.0 | 20% |
| Biotechnology | $120,692 | $58.0 | 15% |
| Insurance | $120,692 | $58.0 | 15% |
| Energy & Utilities | $115,445 | $56.0 | 10% |
Understanding how a Mainframe Developer III's annual salary breaks down can help with budgeting. Below, you can see the average hourly rate, weekly pay, and monthly pay for this role. Use the buttons to switch between different pay periods.
| Annual Salary | Monthly Pay | Weekly Pay | Hourly Wage | |
|---|---|---|---|---|
| 75th Percentile | $113,590 | $9,466 | $2,184 | $55 |
| Average | $104,950 | $8,746 | $2,018 | $50 |
| 25th Percentile | $96,830 | $8,069 | $1,862 | $47 |
Promotions are the fastest way to increase your earnings. As a Mainframe Developer III, you have the following paths for advancement. The table below compares the salary raises for common next-step roles. By comparing these figures, you can choose the career path that best meets your financial goals.
| Next Step Role | Estimate Salary | Projected Raise |
|---|---|---|
| Application Programmer Analyst IV | $146,400 | 39% |
| Software Research and Design Architect IV | $148,520 | 42% |
| Backend Applications Developer IV | $148,300 | 41% |
| Full Stack Engineer Specialist | $148,300 | 41% |
Ready to take the next step in your career? Browse thousands of current Mainframe Developer III job openings on our job board. Use the search bar below to find your perfect match.
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