I don't know why any electronic devices and software are needed for an election.
My plan:
All voters use paper ballots. Everyone votes in person, except military not at home, and signed and attested absentee ballots for those who cannot vote in person because of physical disability. Absentee ballots must be at the precinct by the close of the day. Those received after cannot be counted.
Three elected judges of elections, voted for by the voters of the precinct in the previous election cycle.
These three judges count the results on each paper ballot in series, sitting at a table side by side, with three poll watching volunteers sitting across from them. Every hundred ballots, the judges each call out the cumulative results; if they all agree, then they proceed; if not, go back and count the previous batch of a hundred till they agree.
When all ballots are counted, the totals are written down on paper, with two copies, signed by each judge and poll watcher, signed and stamped by a notary public.
One copy is hand carried to the county registrar, where three people add the precinct totals, watched by three volunteer poll watchers. If they all agree, the results are written down on paper and signed by the counters and the poll watchers.
County results can be scanned and emailed to the state secretary of state for a preliminary count, but it won't be official until a copy from each county is hand delivered to the state capital and recounted by the secretary of state.