Why not create a FB page and create it like a sales funnel, so someone visiting your profile or page will click on your link you put in into your bio. The link will jump to your page where you drive them to raise their issue and order your service. Post useful tips and hints on programming in your posts on FB every day. And join relevant groups where people will seek these types of services. In time, other FB users will click on your bio to see who you are. Become an authority figure on FB for this specific niche.