Question: I am an entry level web developer for a small company in the US. I do full stack web development and lead my own medium sized projects. I have moved from intern to contractor and now recently to full time employee status. 

I was very eager to accept the full time salaried offer of roughly ~45k(healthcare stipend included). Before I became salaried I was making 20$ hourly. I do not get any 401k or other benefits aside from vacation. Reflecting on this past year as I start to gather all of my tax info, I feel like I am actually making less money for more work, which is much more involved. 

I get along great with my coworkers and feel like I am a key part of the team and also think I have surprised everyone with my work thus far. I was told I would get my salary adjusted in 6 months after my start date, but I almost feel like I am being taken advantage of as a junior/entry level developer. I am making fast progress and want to be compensated for my hard work. 

How do I go about renegotiating? Should I wait until the 6months is up and try to negotiate then? Would going back to hourly be worth it? I do not have any other offers at this moment. From some research it seems the US entry level salary is around 65-70k for similar positions.

Location: North Central, KY

Answer: 
Face the facts, you accepted the offer. Now would not be the time for you to renegotiate an accepted offer, a 6 month review might be a little early, but it is certainly a time to do so if you believe you have made considerable work, a 1 year might be better given the circumstances.

On that note, comparing salary levels nationally to KY would not be reasonable given the state's lower cost of living. Look for local positions that are hiring in your field and experience for a better gauge of market wages.

In the meantime, the best ROI would be for you to ask if you can have your company pay for certifications and/or training to increase your knowledge and value.
Performance and productivity put aside, it is going to depend a great deal on the general policy of your company regarding salaries. Do you know anything about how your coworkers fare in that department ? I don't suggest you ask directly as this is often a touchy subject as best, but if you know ballpark figures, you might be able to handle the situation better.

It could be that your company generally pays well below market level, which would mean you might want to look for something else in a relatively short-term basis. Sure, if you really love the work and all, you can stay, but a low salary is likely to impact your salary evolution throughout your career. I'm not sure going back to hourly is an option : it seems like switching to full employee status is a step forward status-wise, and trying to take that away might be perceived negatively (as in "I don't like it that much here", or worse, "I don't know what I want", or even worse, both). In that case, maybe you should have kept to hourly, but there might have been other incentives to switch I am not aware of.

Maybe it's just company policy to offer a low starting salary, and reevaluate after some time to assess the value of new employees. In that case, just buckle up and show what you're capable of, which you are apparently already doing. This seems to be the most plausible scenario to me, considering your company already mentioned a reevaluation after 6 months. Since you are entry-level, you might not be aware of this, but know that 6 months is a pretty short time in the workplace : "proving yourself" is more a matter of a couple years at least. I wouldn't advise reminding them of their "engagement" to adjust your salary immediately after 6 months have passed, in fact, you can very well wait for a whole year, but that's more opinion-based. What seems sure to me is that if your company doesn't come back to you after 6 months, you shouldn't it back up immediately, or you risk being seen as greedy. You don't have to wait for a year, but don't make it look like you're only interested in the money.

Remember : if you're not satisfied, nothing keeps you from mentioning it, or finding somewhere else to work. But unless you really perceive your situation as unacceptable, I strongly suggest you take it slow. This is the kind of "issue" that can be resolved with patience and correct decision-making.