The Only Job Changer in the World is a Manga/Manhwa/Manhua in (English/Raw) language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.ManhwaZ.com fastest updating comic site. The Summary is
Tsukasa, a company employee who repeatedly changes jobs in search of better conditions, challenges the final interview of a major corporation. But as soon as he went past the door, he found himself in another world. His past career seems completely irrelevant, leading to a sense of discouragement. But, the "Job Changer" bestowed upon him grants him a unique ability! With the power to freely switch between jobs like swordsman, mage, spear user, alchemist, appraiser, pharmacist, and more, he begins a leisurely life in this different world. Whether dealing with monsters or making use of abundant knowledge from herbs to items, he adapts effortlessly, engaging in everything from helping people to earning money. Unstoppable with his versatile skills, the powerful corporate slave leaps into a fantasy of career advancement!