Tool Use / Function Calling Engineer.
Philadelphia.
$202,000
median salary, 9% above the national average
$150,000 to $264,000. Updated for 2026.
The numbers.
Everything you need to negotiate with confidence.
Philadelphia is 9% more expensive than the national average. For Tool Use / Function Calling Engineers, that shakes out to a median of $202,000, with the full range spanning $150,000 to $264,000. Compensation scales with the complexity and reliability of tool integration systems built. Know the range before you walk in.
Salary range
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How Philadelphia compares
Philadelphia, PA
$202,000
Cost of living: 9% above average
National Average
$185,000
Philadelphia is $17,000 above
What you should know
Here is what the Tool Use / Function Calling Engineer market actually looks like in Philadelphia. Philadelphia combines a robust healthcare and life sciences sector with established finance and higher education institutions. The city's pharmaceutical corridor is among the strongest in the country. Tech growth has accelerated, particularly in health tech and enterprise software, offering salaries that stretch further than in nearby New York. 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 Philadelphia, 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: pennsylvania has a flat 3.07% state income tax, but Philadelphia adds a 3.75% city wage tax for residents. This combined local burden is worth factoring into salary negotiations. When someone quotes you $202,000, ask what the total package looks like. The gap between base and total comp is where real money hides.
On negotiation: Account for the Philadelphia wage tax in your ask. Request a 5 to 8% premium over suburban offers to offset the city's local tax on all earned income. The range for Tool Use / Function Calling Engineers in Philadelphia runs from $150,000 to $264,000. That is not a narrow window. Where you land inside it depends almost entirely on whether you negotiate and how well you prepare.
Top industries in Philadelphia
Negotiating in Philadelphia
Account for the Philadelphia wage tax in your ask. Request a 5 to 8% premium over suburban offers to offset the city's local tax on all earned income.