Let's get shit started: Rings of Saturn
Rings of Saturn are a California based Tech Death band (surprised?). Their music is lyrically and musically influenced by Aliens and Space, which is pretty obvious once you listen to them and admire their artwork.
Their catchy riffs and insane melodies are going to be stuck in your head forever.
If you're looking for groove in your metal, this is the band you want to be listening to. Seized and Devoured has one of the greatest grooves I've heard in Tech Death still to this day. Both of their albums are clearly all about the guitars.
Embryonic Anomaly was their first release and is just straight up slick playing, lacking on the songwriting. I would still thoroughly recommend it. Since that album is what broke me into Tech Death!
Dingir on the other hand is a masterpiece. It highlights how much they've progressed as a band and a lot of work went in to make the album as good as it is. The opening track has great guitar work and an amazing mid-section of upbeat instrumentation. The vocalist is one of the best in the genre, his highs and lows are flawless.
I recommend you listen to both their albums, and if you enjoy them you'll be pleased to know they're working on a new album right now with Aaron Kitcher of Blacktongue/Infant Annihilator.