Eight AEC disciplines share one occupation code. They land in all three hiring-difficulty bands.

Atlas resolves hiring difficulty for 34 AEC disciplines through 19 federal occupation codes. Civil Engineers alone covers eight of them, from the easiest band to the hardest, and three of the seven hard-band disciplines sit inside it.

Atlas bands hiring difficulty for each of the 34 architecture, engineering and environmental disciplines in its taxonomy, resolving every one through the same waterfall the product's capability heat map uses over cached Bureau of Labor Statistics occupational data. On October 6 that cache was current, carrying the 2025 annual release, so the bands below come from the federal data rather than a fallback. Seven of the 34 landed in the hard band.

The middle number is the one worth sitting with. Thirty-four disciplines resolve through 19 occupation codes, and the distribution is lopsided. A single code, 17-2051 Civil Engineers, feeds eight of the 34. Its own band is low. Nationally it covers 367,840 people at a median wage of $108,670, and on the scarcity measure behind the bands it is the second least scarce occupation in the entire AEC set. A firm that looked up civil engineering and stopped there would conclude this is an easy hire.

One code, eight disciplines, three bands

The eight disciplines that resolve through Civil Engineers do not agree with each other. They spread across every band Atlas has.

Read down the last column. In no case does the hard band come from Civil Engineers. For geotechnical and wastewater work it comes from Environmental Engineers, a much smaller occupation at 38,340 people nationally. For structural engineering it comes from a category titled Engineers, All Other. For the three transportation and drainage disciplines in the middle, nothing in the occupational data lifted them at all. Atlas's industry floor did, because the engine encodes specialty bottlenecks occupation-level data cannot resolve.

Where the data has no name for the work

Two of the seven hard-band disciplines, fire protection and structural engineering, resolve through 17-2199, titled Engineers, All Other. For fire protection that residual category is the only occupation in the mapping at all. It is well populated, 154,070 people at a median of $125,330, and it is also the highest-paid occupation anywhere in the AEC set. The best-paid engineering work in this market is counted under a heading that names no profession.

The same coarseness repeats across the taxonomy. Environmental Scientists and Specialists covers five Atlas disciplines, including air quality, noise and climate work. Urban and Regional Planners covers four. Three disciplines, scheduling, grants and funding support, and public outreach, map to no occupation code whatsoever and are banded by documented curation instead.

The hard disciplines are mostly the small ones

Ranked by national employment, the occupations behind the hard band are thin. Hydrologists number 5,850. Anthropologists and Archeologists, the sole occupation behind cultural resources, number 8,990. Both are cases where the federal data did not call the work hard and Atlas's floor overruled it, lifting hydrology and hydraulics from medium and cultural resources from low. Six of the 34 disciplines carry that floor provenance and three of them reach the hard band through it.

That is the honest limit here. Three of the seven hard bands are an industry judgment recorded in the engine and labeled as such on the public pages, not a reading of the federal release. The other four, fire protection, geotechnical, structural and wastewater, came from the occupational data alone.

The practical takeaway

Profession-level hiring data cannot answer a specialty-level question, and public work is almost always specified at the specialty level. A solicitation asking for a geotechnical lead, a fire protection engineer or a cultural resources specialist is asking for something inside one of these codes, never for the code itself. A market scan that stops at Civil Engineers prices three of the hardest disciplines in this market as routine, and a compensation benchmark built the same way will be low on exactly the roles that are hardest to fill.

Two things follow for a firm leader. First, when a recruiting plan or staffing forecast leans on a national wage or availability figure, check which occupation it describes and how many disciplines your firm staffs inside it. Eight inside one code is the realistic case, not an edge case. Second, the useful question stops being what the national average says and becomes which of those eight disciplines your own evidence can demonstrate by name, which is the form a prequalification list asks it in anyway.

Method and limits. Bands come from the production hiring-difficulty loader, resolving each discipline through the product's own heat-map waterfall over the cached 2025 BLS annual release, computed October 5 and read October 6. Provenance per discipline: 25 of the 34 resolved from the occupational data, 6 from the documented industry floor, 2 from expert curation and 1 from a hardcoded fallback. Where several occupations feed one discipline the most pessimistic band wins, which is why a blended discipline can band harder than either code alone. Wage and employment figures are national values for the occupation, not for the specialty inside it, and that gap is this post's subject rather than a correction to it. The 19 codes named here are the ones Atlas's AEC taxonomy maps to, not the full federal catalog. Figures are frozen as of the data date and are not updated after publication.