I'm working in the city center (BKK1) for an IT company with both locals and expats, (W.E Bridge Technologies, should show up on google maps). So not quite the location you are looking for.

I could advise you to contact elevatedrealtyco.com (not affiliated in any way), they helped me find my place, and they only charged landlords last time I checked.

The condo pricing is really overpriced in the area (especially BKK1), but it will probably go down, too many condos in construction/just finished and most are unoccupied so I'm hoping prices will go down...