I have some questions about this: what is the role of an architect in an agile process? What we are doing here does NOT at all seem agile to me, it's just waterfall in a scrum jacket. Wouldn't it make more sense to have an architect as part of the team an iteratively let them design stuff?
And are architects still a thing anyway? As an engineer I have boots-on-the-ground experience setting things up, I have all the certifications and knowledge for determining the right way to set this up. Shouldn't a senior engineer being trusted with this rather than a non-coder?
Last question: is it normal to write 40-page documents with all the architecture details before you start building? I never encountered this before at any companies (mind you, this is not a government institution, it's a for-profit company).
To give context: the team exists of only 1 engineer (me), a team of architects that are all working part-time on it, a bunch of stakeholders, product owner, scrum master, external parties. It's a project that should take maybe half a year to build.
There's your problem right there. If your Architects are non-coders then honestly, they shouldn't be dictating the low level implementation detail, this should be left up to the engineering teams to work out.
In the UK at least, Architect is a title you give a seasoned technical person who wanted a promotion pathway but without direct line management responsibility. It wasn't until relatively recently enterprise businesses recognised they needed to introduce career pathways for proven technical people who wanted to remain technical and not managerial/political. When I started (2003) the only way to get promoted was to start managing people and to let go of the technical work. Dread to think how many great engineers were lost to this old school thinking.
I also think there should be a layer of authority that is making decisions that span across teams like which cloud provider (AWS, Azure, etc), programming languages, tools (git, svn, trello), integration methods between systems (service buses, event hubs), other third party services, security standards, etc.