Service · Mobile + custom application development
Cross-platform mobile and web applications tailored to your business goals. iOS, Android, and hybrid builds with intuitive UI/UX, robust functionality, and consistent performance across every device. Award-winning team, 14+ years, 500+ apps shipped.
Our expertise
Tailor-made mobile and web applications that match your business goals. We prioritize intuitive UI/UX, robust functionality, and seamless performance across all devices, enabling you to engage users effectively across iOS, Android, and the web.
01 · Native iOS
iOS-first builds when iPhone or iPad is the primary device. Apple Watch and tvOS extensions when the engagement calls for them. Direct access to platform features without abstraction layers.
02 · Native Android
Android-first builds for Android-heavy markets or device-specific use cases. Material Design 3 by default. Wear OS and Android Auto extensions when needed.
03 · Cross-platform
One codebase, two platforms when the use case justifies it. Cost-efficient when feature parity matters more than platform-specific polish.
04 · Hybrid + web apps
PWAs that install on iOS and Android without app-store gates. Hybrid builds for content-heavy use cases where web technologies fit better than native code.
Capabilities
The same senior staff that scopes the engagement is the staff that builds, tests, and ships it. No bait-and-switch. No rotational handoffs at handover.
User research & UX
User interviews, competitive analysis, information architecture, and high-fidelity Figma prototypes. Accessibility-first practice, WCAG 2.2 AA + Section 508 conformant.
Backend & APIs
Node, Python, PHP, or Go backends as your stack requires. Strongly typed API contracts, OpenAPI documentation, and integration with the third-party services your app depends on.
AI integration
Knowledge-base-grounded chatbots, recommendation engines, content generation, and predictive analytics. Cost-monitored production deployments, not demo-quality.
QA & release
Unit, integration, and end-to-end tests in CI. App Store and Google Play submission management. Crash reporting and performance monitoring after launch.
How we work
The phases that apply to every engagement, not just custom app development. The team that scopes does the building, and the operating.
Phase 01 · 2–4 weeks
Stakeholder interviews, technical review of existing systems, risk register, written scope with milestones and exit criteria.
Phase 02 · 3–12 months
Two-week sprints with working demos. Senior leads on every sprint review. Code reviewed, accessibility checked.
Phase 03 · 2–6 weeks
Parallel run with rollback path. On-call coverage during the launch window. Stabilization continues until incident rate trends to zero.
Phase 04 · ongoing
Multi-year retainer with the same team that built the product. Monthly check-ins, quarterly business reviews.
Read the full engagement model on the How We Work page.
Industries we serve
Six core verticals where OST has the deepest engagement experience. Plus nine adjacent industries served on selective engagements.
01
K-12 charter networks, higher education, public sector portals.
02
Donor-cycle nonprofits, advocacy organizations, civic platforms.
03
HIPAA-aware platforms, medical directories, telemedicine adjacency.
04
Multi-tenant SaaS, brokerage tools, self-storage operators.
05
OpenCart specialists, custom commerce, $10B+ in transactions processed.
06
Industrial platforms, B2B safety-tech, embedded engineering teams.
Also serves on selective engagements
Frequently asked questions
3 to 12 months from kickoff to first production release, depending on complexity. Pilot and MVP scopes can ship in 8 to 12 weeks. Enterprise builds with deep integrations run 9 to 14 months.
Pilot scope (one platform, basic backend) starts around $40K. Production scope (multi-platform, custom integrations) lands $100K to $250K. Enterprise scope with deep integrations runs higher. Use our modernization cost calculator for a defensible bracket at our blended rate.
Native if you need maximum platform polish, deep integration with platform features, or you have a single dominant platform. Cross-platform when feature parity across iOS and Android matters more than platform-specific behaviors. We help you decide in discovery.
Yes. Our default is multi-year retainer with the same senior staff. The senior on your kickoff call is the senior on year-five releases.
Yes. Submission management, store-listing copy, asset preparation, and policy-compliance review. We sit through the rejections and resubmissions so you do not have to.
WCAG 2.2 AA + Section 508 conformance is included in baseline scope, not an upcharge. Audit-ready documentation produced as part of every engagement.
Ready to build?
Multiple ways to start: schedule a discovery call, run our cost calculator for a budget bracket, or use the contact form for a written response.
