CONCEPT STAY LLC is a software engineering team working out of the Carpathian Mountains. We build products the way a good GPS reads terrain: nothing approximate, no blind spots, no drift over time.
Pick a route, or let us chart a combined one across your whole system.
Fast, secure web apps and portals built on React, Node.js and modern cloud stacks.
Native and cross-platform apps tuned for real, everyday use.
Infrastructure design, migration and upkeep across AWS, Azure, GCP.
Purpose-built software for the processes off-the-shelf tools don't fit.
Full survey of an existing codebase, with coordinates for every weak point.
Monitoring and incident response once the system is live in production.
We map the real problem with your team before touching any code.
Architecture and a build plan the whole team can read and question.
Development in short, visible iterations, with a working build every week.
Launch day, then ongoing monitoring — we stay attached to what we ship.
CONCEPT STAY LLC is based in Yaremche, a town in the Ukrainian Carpathians sitting at 585m elevation, 12km from Hoverla — the highest peak in Ukraine at 2,061m. GPS, altimeters and weather stations are part of daily life here; precision isn't an abstraction, it's what keeps hikers on the right side of a ridge line.
We hold our software to the same standard: no approximate answers, no untracked edge cases, no drift between what was promised and what ships.
Fill in the form, or write directly — we reply within one working day.