Tool Use / Function Calling Engineer.
San Diego.
$216,000
median salary, 17% above the national average
$161,000 to $283,000. Updated for 2026.
The numbers.
Everything you need to negotiate with confidence.
San Diego is 17% more expensive than the national average. For Tool Use / Function Calling Engineers, that shakes out to a median of $216,000, with the full range spanning $161,000 to $283,000. 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 San Diego compares
San Diego, CA
$216,000
Cost of living: 17% above average
National Average
$185,000
San Diego is $31,000 above
What you should know
Here is what the Tool Use / Function Calling Engineer market actually looks like in San Diego. San Diego's economy thrives on defense, biotech, and a growing tech startup scene. The city's proximity to major military installations drives strong aerospace and cybersecurity demand. Biotech companies along the Torrey Pines corridor compete aggressively for scientific and engineering talent, pushing specialized salaries close to Bay Area levels. 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 San Diego, those numbers run higher. The cost of living here is 17% above average, and employers adjust to compete.
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: california's top 13.3% state tax applies here. While San Diego has no city income tax, the state burden means you should negotiate gross pay higher than you might expect for the cost of living. When someone quotes you $216,000, ask what the total package looks like. The gap between base and total comp is where real money hides.
On negotiation: Leverage defense and biotech sector demand. Candidates with security clearances or specialized science backgrounds can command 15 to 20% premiums in San Diego. The range for Tool Use / Function Calling Engineers in San Diego runs from $161,000 to $283,000. 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 San Diego
Negotiating in San Diego
Leverage defense and biotech sector demand. Candidates with security clearances or specialized science backgrounds can command 15 to 20% premiums in San Diego.