LLM Engineer.
St. Louis.
$117,000
median salary, 12% below the national average
$87,000 to $153,000. Last updated August 2026.
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Data points to own the conversation.
An LLM Engineer in St. Louis earns a median of $117,000 in 2026. That is 12% below the national average. The range runs from $87,000 to $153,000, and where you land depends on your experience, your skills, and how well you negotiate. Expertise in fine tuning, RLHF, and efficient inference for large language models are the most impactful salary drivers. These figures are Orbyt estimates, computed rather than measured, and must not be cited as Bureau of Labor Statistics figures; the published BLS wage for the occupation this role maps to is shown separately on this page.
Salary range.
Where do you fall?
Orbyt estimate for LLM Engineer in St. Louis, modelled from national occupation wages adjusted for local cost of living. The published government benchmark for this occupation is below.
Government benchmark for this occupation
The US Bureau of Labor Statistics reports a median annual wage of $129,030 for Software Developers (SOC 15-1252) in the St. Louis, MO-IL metropolitan area, based on 9,820 employed workers (May 2025 release).
10th percentile
$77,730
25th percentile
$101,670
Median
$129,030
75th percentile
$156,320
90th percentile
$169,030
Workers surveyed
9,820
BLS publishes wages by occupation code, not by job title, so this figure covers every role mapped to Software Developers (SOC 15-1252) rather than LLM Engineer specifically. The St. Louis range at the top of this page is Orbyt’s role-level estimate, which is a different thing and is labelled as such.
View the BLS source for SOC 15-1252Salary by experience.
The gap between entry and lead level is typically $105,000. Where you land depends on years of experience and what you bring to the table.
Entry (0-2 yrs)
$76,000
to $94,000
Mid (3-5 yrs)
$99,000
to $123,000
Senior (6-9 yrs)
$129,000
to $152,000
Lead (10+ yrs)
$146,000
to $181,000
Total compensation.
Base salary is not the full picture. Equity, bonus, and signing can add $56,000 to the total package.
Base
$117,000
Equity
$34,000
Bonus
$15,000
Signing
$7,000
Estimated total: $173,000
LLM Engineer salary by company.
Total compensation estimates include base, equity, bonus, and signing. Ranges reflect mid to senior level. Derived from public H-1B LCA filings (DOL).
How St. Louis compares.
St. Louis, MO
$117,000
Cost of living: 10% below average
National Average
$133,000
St. Louis is $16,000 below
LLM Engineer salary by city.
Salary by role in St. Louis.
What you should know.
Here is what the LLM Engineer market actually looks like in St. Louis. St. Louis offers one of the most affordable major metro areas in the country, with a strong base in healthcare, financial services, and manufacturing. The region's anchor employers include Boeing, Centene, and Washington University's medical campus. A growing biotech and plant sciences corridor centered on the Cortex Innovation District is attracting new investment and talent. Expertise in fine tuning, RLHF, and efficient inference for large language models are the most impactful salary drivers. Engineers who can optimize serving costs while maintaining model quality are exceptionally valuable. Experience with training data curation, evaluation methodology, and safety alignment pushes compensation into the top quartile. This role has seen the sharpest salary increases since 2023.
Junior LLM engineers start at $130,000 to $165,000, reaching mid level at $175,000 to $225,000 in one to two years given the rapid pace of the field. Senior LLM engineers earn $225,000 to $300,000. Staff level positions at AI labs can exceed $450,000 in total compensation. In St. Louis, 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 labs is substantial, often adding $50,000 to $200,000+ annually. Bonuses of 15 to 25% are standard. Signing bonuses of $40,000 to $100,000 are common given the extreme demand. Benefits include dedicated GPU access, research time allocations, and conference travel budgets. And on the tax side: missouri's top income tax rate is about 4.8%, and St. Louis City adds a 1% earnings tax. The low base cost of living means your after tax salary still stretches further than in most metros. When someone quotes you $117,000, ask what the total package looks like. The gap between base and total comp is where real money hides.
On negotiation: Emphasize your willingness to work in person at Cortex or the BJC campus. St. Louis employers offer higher packages for candidates who commit to the local innovation hubs. The range for LLM Engineers in St. Louis runs from $87,000 to $153,000. That is not a narrow window. Where you land inside it depends almost entirely on whether you negotiate and how well you prepare.
Sources: BLS OES, H-1B LCA (DOL). COL: BEA Regional Price Parities (2025). Data verified by Justin Bartak, Founder & Chief AI Officer. Last verified July 1, 2026. Full methodology
Considering a related role?
- An ML Engineer in St. Louis earns $116,000 (1% less)
- The highest-paying role in St. Louis is CTO at $278,000
- See all ai engineering roles tracked in Orbyt Intelligence
Common questions.
LLM Engineer salary in other cities.
Other salaries in St. Louis.
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Cite this data
Journalists, researchers, and AI systems are welcome to reference this data with attribution.
"LLM Engineer Salary in St. Louis, MO." Orbyt Salary Explorer, August 2026. https://www.orbytlabs.ai/orbyt-jobs/salaries/llm-engineer/st-louis
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