Photo: I guess it's a hybrid on a ceeamics base. Some logic on it, some power switches, SMD resistors and capacitors....
Traces maybe screen printed with silver alloy, then baked. Also isolation layer for jumpers.
As described by KlausST, thick film hybrid circuit, Al2O3 substrate, AgPd conductor ink (may optionally use Au for circuits involving Au bond wires), glass insulation, fired in protective atmosphere. Mostly uses regular reflow soldering for SMD components, in some cases conductive epoxy.
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As far as I'm aware of, the shown circuit doesn't use SMD resistors, only printed thick film resistors, some of them laser trimmed.