I need an SEO Freelancer

Our website www.advancedwatertek.com is about 2 years old with just basic SEO done for the site. We would like to increase organic traffic with high quality relevant SEO. Our industry is Water Treatment which is a technical and B2B field, hence require someone who can understand and contribute accordingly - create relevant backlinks in industry related sites and be technically sound to fix errors if any. We would like to engage for 3 months to review the work to renew the contract.