I have a few questions and comments... Are you creating your own address locator to geocode the customers and offices in the spreadsheet? If you did you could use the General - Gazetteer locator style to build an address locator to search for office name, Dual Range or Single House style to search for addresses, then combine the two into a composite locator that could be published as a geocode service that the web app can use. Will you be using the World Geocoding Service and an ArcGIS Online subscription for geocoding the addresses? You would need a geocode service to be able to have the web application make REST calls to the geocode service and return matches for the address. What are you going to use to host the web map (app)? Is the database part of an enterprise geodatabase? What licence of ArcGIS Desktop do you have? You maybe able to make use of the dynamic feature class mentioned at step 7 in this help topic, Geocoding a table of addresses in ArcMap—Help | ArcGIS Desktop . This would require that the table (database) of addresses and the geocode result be stored in the same geodatabase as a composite relationship class between the table and output feature class is created when the dynamic feature class option is selected. The idea is that if the input address table is updated within ArcGIS Desktop manually or pragmatically that the address will get automatically geocoded and added to the output feature class in the geodatabase.
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You need to be willing to work in any industry and move out of your home space. A lot of people I knew in GIS classes had great intentions of working for a Department of Natural Resources. Myself included. But I got a job in E911 and then a job in Electric Utilities using GIS. Don't focus on an internship in being "THE WAY TO GO". If an internship pops up great, if a regular job pops up so much the better. Though a lot of places may hire an intern. That is a painless way to see if that person will work out. If not they can say thanks and have a good day. You should make bookmarks to ALL of the county agencies in your search area to their job postings. Check them every Tuesday. It is surprising how often entry level GIS jobs pop up. Nothing is more valuable on your resume than actual work experience and showing that you can stick with a job. One of the biggest mistakes people make on a resume is making it a multipage autobiography of their life. Other than the cover sheet keep it to ONE page. Any of your part time low wage jobs keep to a single line or so.
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