Technological utopianism (often called techno-utopianism or technoutopianism) is any ideology based on the premise that advances in science and technology could and should bring about a
utopia, or at least help to fulfill one or another utopian ideal.
Hence, to refer to a person who ascribes to such a belief system: technological utopian or techno-utopian, with or without the hyphen - personally I prefer it with, as it is easier to read properly.1 (Utopianist2 also exists as an alternative to utopian and could also be used, if you preferred.)
Techno-utopian is quite a new word and the only dictionary I can find that specifically carries it is Wiktionary, which has it both with and without the hyphen:
techno-utopian (comparative more techno-utopian, superlative most techno-utopian)
Believing that technological advances will create a utopia.
techno-utopian (plural techno-utopians)
A person of techno-utopian beliefs.
Despite the lack of dictionary entries, the word can easily be found in journalism, and is both well-established and readily understandable from its constituent parts for those to whom it is new:
Foreign Policy, David Rieff, April 29 2013
If utopia has always been a kind of escape clause from the human
condition, contemporary techno-utopianism represents a radical
upping of the ante. For entrepreneur Peter Diamandis, creator of the X
Prize to spur the development of passenger-carrying private spaceships
and other innovations, not only will technology make it so that
"during our lifetime … we’re moving off this planet," but it will
solve even the gravest problems that confront humanity — climate
change, species extinction, water and energy shortages.
Newsweek, Niall Ferguson, 30 July 2012
Are you a technoptimist or a depressimist? This is the question I have
been pondering after a weekend hanging with some of the superstars of
Silicon Valley. I had never previously appreciated the immense gap
that now exists between technological optimism, on the one hand, and
economic pessimism, on the other. Silicon Valley sees a bright and
beautiful future ahead. Wall Street and Washington see only storm
clouds. The geeks think we’re on the verge of The Singularity. The
wonks retort that we’re in the middle of a Depression.
The above Newsweek article also uses technoptimist with more or less the same meaning as techno-utopian. It hasn't made it into any dictionaries yet (or, at least, I couldn't find it).
Technoptimist is definitely in use, and isn't just a semi-witty nonce word coined by a journalist.
For instance, we can find the term in use in an interview on Quartz with a tech-enthusiastic doctor:
Bob Wachter, a physician and professor of medicine at the University of California, San Francisco, has championed the use of technology in hospital care. And, yet, he has seen time and again that the problem lies mainly in the implementation of technology.
where the accompanying picture of the interview subject is captioned:
The technoptimist doctor.
An article on the website of Oxford Insights, a consultation firm that provides tech implementation advice to the public sector, uses technoptimist in contrast to technoskeptic - opposite poles on a spectrum of opinion:
AI and legitimacy: government in the age of the machine
The truth of the effects of AI on societies is likely somewhere between the “technoskeptic” and the “technoptimist” predictions. Regardless of where one falls on the scale, the adoption of artificial intelligence by government raises important questions about government legitimacy.
(Depressimist seems to be the term that technoptimist is usually contrasted with, as indeed it was in the Newsweek article. While depressimist has the questionable merit of being a portmanteau word formed similarly to technoptimist, it isn't as specific or as easy to understand as technoskeptic, especially without having technoptimist to clarify the meaning in context.)
The word technoptimist seems to be most often used in people's self-describing self-promoting blurbs; I am reluctant to link to even one of them but it is trivial to find examples with any reasonable search engine.
Alternative forms, techno-optimist and tech-optimist (with and without the hyphen), can also be found, as can the full forms, technology optimist and technological optimist.
In a Huffington Post article entitled "Why Techno-Optimism Is Dangerous" from July 2016, we can see the following example:
This general view about technological progress has been endorsed by
thinkers including Matt Ridley, David Deutsch, K. Eric Drexler and
Peter Diamandis. These techno-optimists do acknowledge dangers. But
they find reassurance in a dependable habit of technological progress
to clean up after itself.
Simlarly, there is a blog post on DXC.technology with the title "Why I’m a tech optimist".
Technology optimist can be found, for example, in this article on the LinkedIn platform entitled "Why I’m a technology optimist – and you should be too".
We can find technological optimism in the linked article on Big Think called "5 Reasons for Technological Optimism".