Tool Use / Function Calling Engineer.
North Charleston.
$172,000
median salary, 7% below the national average
$128,000 to $225,000. Last updated April 2026.
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Data points to own the conversation.
If you are evaluating a Tool Use / Function Calling Engineer offer in North Charleston, SC, here is the reality: $128,000 to $225,000, with $172,000 as the midpoint. 7% below the national average. Compensation scales with the complexity and reliability of tool integration systems built. Do not accept the first number.
Salary range
Where do you fall?
Salary by experience
The gap between entry and lead level is typically $155,000. Where you land depends on years of experience and what you bring to the table.
Entry (0-2 yrs)
$112,000
to $138,000
Mid (3-5 yrs)
$146,000
to $181,000
Senior (6-9 yrs)
$189,000
to $224,000
Lead (10+ yrs)
$215,000
to $267,000
Salary trend
+7% YoYTotal compensation
Base salary is not the full picture. Equity, bonus, and signing can add $40,000 to the total package.
Base
$172,000
Equity
$22,000
Bonus
$15,000
Signing
$3,000
Estimated total: $212,000
How North Charleston compares
North Charleston, SC
$172,000
Cost of living: 6% below average
National Average
$185,000
North Charleston is $13,000 below
Tool Use / Function Calling Engineer salary by city
Salary by role in North Charleston
What you should know
The Tool Use / Function Calling Engineer landscape in North Charleston is not what most salary sites will tell you. North Charleston is the industrial and manufacturing heart of the Lowcountry, home to Boeing's 787 Dreamliner assembly facility and the Charleston Naval Complex. The area has attracted significant defense, aerospace, and advanced manufacturing investment. Growth in logistics driven by the expanding port continues to drive employment. Compensation scales with the complexity and reliability of tool integration systems built. Engineers who can design robust function calling frameworks with error recovery and multi-step planning earn premiums. Experience with multiple LLM providers and enterprise API ecosystems drives salaries 10% to 18% above median.
Junior tool integration engineers start near $138,000 building basic function schemas. Mid-level engineers designing robust multi-tool orchestration earn $183,000 to $210,000. Principal engineers architecting enterprise tool-use platforms reach $242,000 to $290,000. In North Charleston, cost of living sits near the national average, so the numbers you see are roughly what you keep.
Base salary is not the full picture. Equity at AI platform companies is a significant compensation component. Performance bonuses of 12% to 18% are standard, with some roles offering developer ecosystem growth bonuses tied to platform adoption metrics. And on the tax side: south Carolina's top income tax rate is 6.4%. North Charleston has no city income tax. The moderate state rate is offset by affordable housing and strong employer demand. When someone quotes you $172,000, ask what the total package looks like. The gap between base and total comp is where real money hides.
On negotiation: Highlight aerospace manufacturing experience. Boeing and defense contractors in North Charleston pay nationally competitive rates for specialized engineering skills. The range for Tool Use / Function Calling Engineers in North Charleston runs from $128,000 to $225,000. That is not a narrow window. Where you land inside it depends almost entirely on whether you negotiate and how well you prepare.
Sources: SEC filings, H-1B LCA (DOL), BLS OES, 50+ job posting platforms. COL: BEA Regional Price Parities (2025). Data verified by Justin Bartak, Founder & Chief AI Officer. Last verified April 8, 2026. Full methodology
Considering a related role?
- A Computer Vision Engineer in North Charleston earns $173,000 (1% more)
- The highest-paying role in North Charleston is Distinguished Engineer at $301,000
Common questions.
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