Int isn't a dump stat for Barbarians
It's a dump stat for everyone. It's the worst stat. The only characters who want high Int are those whose classes specifically require it, and that's pretty much only Artificers and, to a lesser extent, Wizards. That said, if you are building people as characters why are you using a point buy? If you think somebody should have a high INT, give them a high INT.
Balance doesn't need to be a concern here: the goal isn't to make characters who are equal, the goal is to make characters that possess a certain degree of verisimilitude such that they feel right as a caricature-ish stylized artistic representation of an actual person. Since having a high stat in one area, then, doesn't stop you from having a high stat in another area, there's no such thing as a 'dump stat'. Each stat should just be whatever it should be, and the character will work fine from there.
Nevertheless, there is exactly one Barbarian subclass that eventually gets one individual ability that interacts with Intelligence. The first version of the Ancestral Guardian primal path grants at 10th level the ability to grant yourself advantage on intelligence or wisdom checks thrice per long rest as a non-action before rolling. All other versions of the Ancestral Guardian get clairvoyance-related stuff instead, but the initial Unearthed Arcana version has this feature, which is the only feature that interacts positively with Intelligence for the class.
What about backgrounds or races?
There are lots of backgrounds that give you cool "I'm a smart person!" things. The features typically do not require nor benefit from a high Intelligence score. Some backgrounds can grant proficiency in Intelligence skills, but since when a class skill and background skill overlap you can choose any other skill proficiency, the skills a background gives are not a particularly big deal unless they are skills you don't want. Because of this, I'm going to limit this discussion to background equipment and features.
The best background for this character is probably the Simic Scientist. Their background feature essentially allows you to bypass Int checks by instead visiting the library-- similar to the Sage background but without any chance of failure and limited to INT-y stuff:
When you attempt to learn or recall a magical or scientific fact, if you don't know that information, you know where and from whom you can obtain it.
It's also the 'I'm a bio-engineer' background. They start with a book of research notes and also a bunch of biochemical stuff.
Failing that, the Izzet Engineer feature synergizes well with being a Barbarian. It lets you get access to blueprints for buildings and general architectural knowledge:
You have a basic knowledge of the structure of buildings, including the stuff behind the walls. You can also find blueprints of a specific building in order to learn the details of its construction.
That is helpful for setting up and selling a GM on scenes like this. It's not really related to biology, though, but most biology stuff in D&D is more likely to get a Wisdom check than an Intelligence one anyways.
You could also just take Sage or Outlander or whatever other background has a useful feature that works for you. None of them are specifically good for Barbarians in a contributes-to-core-class-functionality way, but many of them will indirectly help by letting you do stuff to make your barbarian-ness more frequently effective or by giving you options when your class features aren't helpful.
As for races, you are going to want something that contributes to your class's core competency there.
Ibis-Headed Aven gives Dex and Int and flight when not in medium or heavy armor (which you won't be in because you are a barbarian) and an ability that helps Int checks you aren't proficient in, so that might be worth looking at.
The Mark of Warding Dwarf gives you a bunch of okay stuff, a bunch of stuff that's really good but you already get from your class and it doesn't stack, +2 Con, +1 Int, and a couple of complicated Int-based thief-y or dwarf-y abilities.
Sea Elf gives you a swim speed and the ability to breathe underwater as well as in air and the ability to talk to fish and +2 Dex, +1 Con. If you are an Aereni Sea Elf, which is totally a legit totally fine thing maybe (or, rather, being an Aereni elf with the stats of a sea elf would be fine lore-wise + rules-wise maybe in Ebberon), you also get to trade out your redundant weapon proficiencies for Expertise in anything you want, which is pretty awesome. If you put it in Perception you get one less skill proficiency, which is sad, but it's still really good and can definitely help out a Barbarian who wants to do other things too.
Svirfneblin is always a good race for Barbarians, since advantage on all mental saves shores up one of the class's biggest weaknesses. Beserkers benefit from this less than most. If you don't swap out Danger Sense for Survival Instincts this means you end up with proficiency on Str and Con saves and advantage on Dex, Int, Wis, and Cha saves. If you take the Ancestral Guardian path, your tankiness and stickiness combine well, which is pretty rare in 5e in my experience-- usually enemies either have no reason to attack a tank or no reason to not attack a sticky target but resistance to everything and d12 hp and high Con plus not attacking you comes with disadvantage and half damage and even less damage if you spend your reaction is enough to make being a tank work okay in this case, in my experience. Svirfneblin, like all gnomes, usually have the drawback of giving +2 Int which is usually worthless to everyone, but that is either good or irrelevant here.
Really, any race that's normally good for Barbarians is going to be good here, too.
