Websites, web & mobile apps with fixed price, 1–2 week sprints and post-launch support.
Fixed price — the quote does not grow mid-project. Deadline — we deliver per contract. Stack — only proven technologies. Support — available after launch.
We optimize LCP, CLS and INP — fast loading on any device and connection.
OWASP practices, RBAC, encryption, audit logs and backups — protection at every layer.
Microservice architecture, caching and CDN — your product scales to any load.
CRM, ERP, payment systems, analytics and any third-party services via REST / GraphQL.
Auto-tests, preview environments and safe rollbacks — fast, reliable releases.
24/7 monitoring, SLA 99.9%, updates and product roadmap for continuous growth.
HOW WE WORK
Transparent process
Demos every 1–2 weeks, real-time task access.
Estimate your budget in 2 minutes. Pick a project type, tune the parameters — get a ballpark quote.
Estimated budget
$7,800 —
$9,900
136 h
effort
4 wk
timeline
$530/mo
support cost
We reply within 2 business hours. We'll sign an NDA, give you a quick estimate and suggest the best approach.
How we work
OneStack is a compact full-cycle team of engineers and designers. We build fast websites, reliable web apps and mobile apps. We own projects end-to-end: from idea to launch and support.
150+
projects delivered
5
years in market
98%
on-time delivery
NPS 91
loyalty index
Technologies
We dive into the product: metrics, funnels, unit economics. We shape value together, not just "deliver a spec".
Short sprints, preview environments, tests and CI/CD. Regular demos and predictable releases with no downtime.
SLA plans, monitoring, alerts and backups. Incident management and continuous quality improvement.