Hello Sir,
I have read your post regarding the requirement for a Full Stack Developer.
Already have developed lots of projects with the use of Full stack & Ruby on rails So, will happy to show you with a live demo via personal chat & explain in detail.
Let me inform you that I have a skillful full stack developer with 8+ years of experience who have already implemented lots of projects and are well versed with SQL database and good knowledge of Javascript.
Also, a developer is familiar with all technologies but they have must expertise in Angular.Js, C#, JavaScript, Ruby on Rails, ASP.NET, MySQL, PHP, node.js, etc...
So the skill of my developer completely compliments your requirements and is capable of managing every section you mentioned i.e. design, development, testing, implementation, and maintenance of software, systems, and solutions.
And I'm happy to say you that our developers are well versed about your mentioned categories, & if you want to check our developer's skill, so you checked it with the Mockup round.
Ready to give tests or mock-ups to assure you of the skills of my developer & YES, If you have any guidance will happy to give a best from our side because I'm very serious about your project.
Awaiting your positive response,
Best regards,
Monali