Level Designer- The level editor is the one who creates and designs the interactive playing field for a certain part of the game or all of the game, this includes plants, buildings, cars and more.
The level Editors is the one who gives the game a path to a story line.
For example if a dark mysterious character was to be created but put in a fairy tale kind of settings with lots of bright colours it would show the game story line to be a joke. instead of the dark character being in somewhere dark and gloomy like a graveyard, this would show the game to be about darkness and death.
Concept artist- Is the one who creates and draws out all possible ideas for a project for a game that they are working on, the concept art can be anything in the game from the main player model,weapons cars and environment, the art is 2D and when the final idea is picked and every concept art that is liked and then taken further to be put into the game it is no longer the concept artist job.
Asset artist- The asset artist is one who creates all the assets for the game once it as come from the concept artist, the asset artist is the one who finalises the work and makes a full product for the game from the work produced from the concept artist.
Game Programmer-
The Game Programmer is the one who programs the game and makes the game work and the one who can implement the controls for the characters and any other asset in the game.
The Game programmer is the one who can control how everything moves and looks like, but when doing this he needs to take in to considartion of how the artist and animators wanted it to look and move in the game.