Funnily enough, most companies I have worked at has much better frontend code than backend...but maybe that's a problem that tends to come with smaller companie

Funnily enough, most companies I have worked at has much better frontend code than backend...but maybe that's a problem that tends to come with smaller companies if they're not hiring the right engineers, and not so much a frontend vs. backend thing. As for advice, find a company hiring for full stack engineers and bill yourself as someone able to learn on the backend. The company also has to be one willing to take that chance. Do not get sucked into the debates of x vs y language, and be willing to adapt to what you're working with. If your credentials are strong, you may have more wiggle room to be opinionated. Edit: Just to add, I also transitioned from frontend to fullstack, although now I'm in the hybrid land of engineering management with coding being a bonus tool for assisting with management. My company has helped multiple engineers with primarily frontend experience transition to fullstack work (or in the case of some, even exclusively backend work). I honestly think it's not worth fussing about languages, as those can be learned - even SQL. Understand your fundamentals, and make sure you present yourself as a flexible person willing to put in the time and effort to learn and you will likely succeed in a transition. Also I recommend avoiding being desperate to switch when job searching in such a transition - few things smell worse than the stench of desperation, which will affect your pay & negotiating wiggle room.