Company: HCKT
Filing Date: 2025-08-06
Form Type: S-8
Source: 0001193125-25-174585
Chunk: 3

Company: HACKETT GROUP, INC.
Filing Date: 2025-08-06
Form: S-8
Chunk 3
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 Table.                                                                                            |

SIGNATURES Pursuant to the requirements of the Securities Act, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 andhas duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Miami, State of Florida, on this 6th day of August, 2025.

| THE HACKETT GROUP, INC. |     |                                             |
| By:                     |     | /s/ Ted A. Fernandez                        |
| Name:                   |     | Ted A. Fernandez                            |
| Title:                  |     | Chief Executive Officer and Chairman of the 
 Board                                       |

POWER OF ATTORNEY Each person whose signature appears below constitutes and appoints Ted A. Fernandez and Robert A. Ramirez, and each of them, his or her true and lawful attorney-in-fact andagent, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any amendments to this Registration Statement, and to file the same, with all exhibits and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact andagents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact andagents, or any of them, or their, his or her substitutes or substitute, may lawfully do or cause to be done by virtue hereof. Pursuant to the requirements of the Securities Act, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated:

| Name                  
 /s/ Ted A. Fernandez  
 Ted A. Fernandez      
 /s/ Robert A. Ramirez 
 Robert A. Ramirez     |     | Title                                                                                                                        
 Chief Executive Officer and Chairman (Principal Executive Officer)                                                           
 Executive Vice President, Finance and Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer) |     | Date           
 August 6, 2025 
 August 6, 2025 |
|:----------------------|:----|:-----------------------------------------------------------------------------------------------------------------------------|:----|:---------------|
| /s/ David N. Dungan   
 David N. Dungan       |