The central point is about a strong woman leader, who created a time traveling force that's dedicated towards saving lives from various tragedies (mostly massacres, but can be terrorist acts or even natural disasters). The saved lives can be saved either through faking their deaths or by averting the tragedy altogether.
The point of view character is, however, mostly not the leader and founder of the organization; she's the most important character and is prominently featured especially at the beginning, but the main point of view character is actually the naïve newcomer:
We get to witness how the team rescues him and his entire village from a massacre, which we get to see his point of view from as well, where they explain that had they not intervened, everyone (himself included) would have died. (To which he just says, "...Oh.")
He ends up being recruited to this time traveling task force though, in part due to his natural talents. The time traveling task force organization is able to do what they do thanks to the aid of a supercomputer (and, partially, because the leader has a bond with a divine entity; on her forehead there's an eye-tattoo mark that's actually the conduit containing a small fraction of a deity's power).
The viewpoint protagonist character, the naïve newcomer, happens to have an innate gift for real-time projection of the supercomputer's model. It's described as basically, the supercomputer projects on a 2D basis, and he is able to process it in a 3D image, with a perfect ability to transition what the supercomputer projects into real life. Basically, he is able to perfectly remember what the supercomputer says (they can't actually take the supercomputer with them on their missions), and then see it (kinda sorta Intersect style from Chuck) overlaid in real life (but think more controlled, more ghostly-3d-imagely) and manage to act on that.
This makes him something of a huge asset on the field. Beyond that, he's also got a huge amount of combat training, is not actually stupid and is naturally smart, charismatic, clever, etc. He was going to lead his village's defense initially, after all. (It wouldn't have worked, per it being a massacre the time travel organization prevents, butstill.) He's got a wide array of, so to speak, adventuring skills. He knows how to approach people, he's decent at adapting to local cultures, he's basically naturally suited to the work.
Also, he, like the leader, has a divine influence--but unlike the leader whose divine entity with a conduit containing a small fraction of a deity's power, he has the entirety of the divine deity (the divine deity inside of him having somehow been hurt badly enough to need to be entirely rather than partially within him), which gives him a huge amount of power.
Magic in this setting doesn't exist everywhere. In fact it only exists in a few places, most places notably don't have magic. (The places with magic are common enough that people know magic exists, but they also know that magic only works in those places and ceases to work outside of those places.)
But in the places magic does work, he is an insanely powerful user of it, albeit largely untrained/untapped.
Furthermore, eventually, down the line, a specific incident ends up cloning the main protagonist character, creating two of him. Unlike most settings where this happens, both are treated as the real deal and with all the freedom to be whoever they want. The two have the same abilities, memories, experiences, etc. before but would over time slightly diverge, but neither is going to be forced to do anything different. The one and only requirement they have is of a tactically-necessary one;
The naïve newcomer protagonist is, explicitly, as soon as he is revealed to be the main character, revealed to be telling the story of how he went from the naïve newcomer to being the organization's second in command and field commander (the one actually in charge of time operations).
Both of hims can end commanding. They are, explicitly, both the exact same rank with the exact same authority as field commander and second in command. They're required to have a mind link whenever giving orders as to not give contradictory orders, where one giving an order is aware of the other giving an order and exactly why the order is being given.
Otherwise, they are free to be themselves, both equally as much the protagonist.
This also only makes him stronger; both of hims have the ability to 3D project the computations, and both of hims have the full deity within them, which means that when they tag-team, they are capable of doing missions that the supercomputer by itself wouldn't be able to handle. In other words, their tag-teaming is more powerful than the supercomputer, able to do things the organization couldn't before.
The story starts with him, however, largely learning the ropes as a rookie. After all, just because he's that powerful and naturally competent doesn't mean he's experienced. He's not going to know everything, so he has to have things explained to him, and has to take time where aspects of the organization are explained to him (and by proxy, the audience).
But eventually, he rises to the rank of field commander and second in command, and from there field operations continue, with more slice of life elements contained within.