Where you are decides what you need.
Every software product climbs the same nine stages. Four questions place you on the map and build your custom plan: what to focus on now, what is too early to spend time or money on, and why that €30k infra quote can wait.
Where is your product, today?
The line that sounds the most like you.
The right work depends on the stage. Not on ambition.
Your stage finds you
Walk the signs upward from stage 0. The first stage where something is missing is yours. Not the one whose problems sound the most interesting.
Later is a distraction
Work from a later stage feels like diligence and acts like avoidance: benchmarks with no users, replication with no load.
Never premature
Secrets out of the code, HTTPS on anything public, auth on anything private, a backup you have actually restored. Everything else waits for its stage.