An experienced company providing result-driven solution must have testimonials and feedback from earlier clients. Testimonials, feedback and case studies will stand as the proof of their credibility. Words from clients will speak a lot about their company culture, work approach and most importantly quality of their services.
Sure, the project is on good hands, all aspects of you needs are take cared by experienced professional; but, that's not enough. Professional companies provide 24x7 customer support and make themselves available at all times. This facilitates clients to reach them any time they want, when they want to make some specific changes which has to been in short time. They must also provide after sales support.
Even if you see increase in sales for business, it is very essential to get factual data on its growth. No project execution is complete if there is no tool to monitor and measure. Weekly reports and daily updates will provide you exactly how much you are getting in return for you investment. You must yourself be able to evaluate the progress of work done by the company.
Experience of the company in the industry can say a lot! An experience of over 15 years mean, they have been providing reliable services consistently, because new companies don't even survive the first two years. By now, they must have worked on almost all types of industry. They have extensive knowledge and have witnessed how digital marketing has evolved overtime. They have strategies that have stood the test of time.
Every company will say that they can take your website to 1st page; but, only a few can provide you the proof. Successful companies have a list of such successful projects which will corroborate their claim and infer the company's healthy work culture, result-driven strategies and their experience in the technicality of digital marketing.