上で details
write + (past) + after doing, on that basis — a deliberate step that grounds what follows
kaita uede
after doing, on that basis — a deliberate step that grounds what follows
meaning: having written
結局、話し合ったうえで、二人は結婚を決めた。
kekkyoku, hanashiatta uede, futari wa kekkon o kimeta.
In the end, having talked it over, the two of them decided to get married. neutral
一晩よく考えた上で、この仕事、やることにしたよ。
hitoban yoku kangaeta ue de, kono shigoto, yaru koto ni shita yo.
After thinking it over carefully for a night, I've decided I'll take the job. casual
Examples
after doing, on that basis — the first action is a deliberate step that the second is built on
結局、話し合ったうえで、二人は結婚を決めた。
kekkyoku, hanashiattauede, futari wa kekkon o kimeta.
In the end, having talked it over, the two of them decided to get married. neutral
一晩よく考えた上で、この仕事、やることにしたよ。
hitoban yoku kangaeta ue de, kono shigoto, yaru koto ni shita yo.
After thinking it over carefully for a night, I've decided I'll take the job. casual
社内で慎重に検討した上で、正式に決定いたします。
shanai de shinchou ni kentou shita ue de, seishiki ni kettei itashimasu.
After careful internal deliberation, we will reach a formal decision. formal
ご相談の上で、最適なプランをご提案いたします。
go soudan no ue de, saiteki na puran o go teian itashimasu.
After consulting with you, we will propose the optimal plan. formal
Formation
{V-ta}うえでattaches to た-form動作性の名詞＋のうえで（ご相談のうえで）attaches to noun phrase (schematic)
Notes
sense. する上で "in the process of / when it comes to doing" (N2) and
plain spatial 机の上で "on top of the desk" are different readings of
the same surface and out of scope here.
Related patterns
Similar
てから is a bare temporal sequencer with no payload beyond order (シャワーを浴びてから寝る needs no deliberation); 上で implies the first action was a considered step that deliberately GROUNDS the second (相談した上で決める) — force it onto a routine, non-deliberate sequence (歯を磨いた上で寝た) and it reads oddly weighty.
あとで only claims the first event precedes the second, with no tie between them (十年前に卒業したあとで, any gap tolerated); 上で requires the two be causally linked — the second decision is explicitly grounded ON the first (相談したうえで決める), not just sequenced after it.