Need a Solid Bump in Credit Score

I am looking for a freelancer who can help me improve my credit score from Poor (below 580) to Good (670-739) as I am looking to qualify for a loan or mortgage. My credit report shows some negative items, specifically late payments and negative information from my current debt consolidation company. The ideal candidate should have experience in credit repair and be able to provide actionable steps to help me improve my score and get the deal I want come November.