Native mobile apps
iOS and Android apps from one .NET codebase, built offline-first so they keep working in a basement, on a train or in a field, and sync safely when the signal returns.
UK software house · mobile and back-office systems
Software the important work runs on.
Zinteli designs, builds and runs secure mobile apps and back-office platforms for education, property and the public sector. Offline-first, accessible and engineered to last, because the organisations using them can't afford anything less.
- Secure by design
- WCAG 2.2 AA
- Offline-first
- UK GDPR ready
Works offlineSyncs when signal returns
EncryptedOn every device
800+ testsBehind a single app
.NET 10
ASP.NET Core
.NET MAUI
Blazor
Entity Framework Core
SQL Server
Microsoft Azure
SignalR
OAuth 2.0 / OpenID
SQLCipher
On-device AI
OpenAPI
What we build
From the phone in a pocket to the system behind it.
We take a product from first sketch to live service, then keep it running. One accountable team covers the app, the back office, the API and the cloud.
Back-office systems
The web platforms that run an organisation: records, workflows, scheduling, compliance and reporting, multi-tenant and audited from the first line of code.
APIs and integration
Versioned, documented REST APIs that connect your systems to each other and to the services you already use.
Cloud and operations
Health-checked, observable services on Azure or your own infrastructure, with every failure captured and traceable.
Private, on-device AI
Language models that run on the user's own device, so sensitive material never has to leave it.
Our products
Proof, not promises.
We build and run our own products. The same engineering goes into every client project, already proven in production.
Back-office platform
The secure back office for modern schools.
A multi-tenant school management platform: administration, people, lessons and learning, with a web back office and phone apps for staff and parents.
- Multi-school by design
- People in one place
- Lessons and timetables
- Learning records
Back-office platform
The operating system for lettings agencies.
A lettings platform that runs the whole tenancy lifecycle: properties, landlords, tenants, compliance and rent, on the web and on every device.
- Property and portfolio
- Compliance that doesn't lapse
- Tenancies end to end
- Rent and statements
Mobile app
All your email in one fast, private inbox.
One calm, fast inbox for every email account on Android and iOS. It works offline and has no servers of its own, so your mail stays between you and your provider.
- Every account, one inbox
- Focused Inbox
- Made for your thumb
- Snooze and pin
Mobile app
Tuition, organised. Wherever you teach.
The phone app for tuition schools, tutors and students: lessons, diaries and learners in one place, working offline.
- Interactive diary
- Upcoming lessons
- Roles, not account types
- Offline-first
Mobile app
The driving instructor's business, in one app.
Diary, students, lessons, payments and performance analytics for driving instructors, with a companion app for their learners.
- Diary and upcoming jobs
- Students and progress
- Business analytics
- Lesson requests
AI learning app
Turn any book into a paced workbook.
On-device AI that turns any educational PDF into a personalised, paced series of print-ready workbooks, with nothing sent to the cloud.
- Bring your own books
- On-device intelligence
- Paced to the learner
- Print-ready workbooks
By the numbers
Engineering you can measure.
6products designed, built and run in-house
800+automated tests behind a single app
10languages shipped, including right-to-left
4platforms from one codebase: iOS, Android, Windows, macOS
How we work
Clear stages. No surprises.
Every engagement follows the same disciplined path, so you always know where things stand, what's next and what it costs. See how we deliver
Discover
Users, goals, constraints and risks, written down and agreed before anything is built.
Design
Prototypes tested with real users, and an architecture chosen for the decade, not the demo.
Build
Fortnightly releases you can touch, with automated tests on every change.
Assure
Security, accessibility and performance checked against published standards.
Run
Monitoring, support and a roadmap, so the service keeps improving after launch.
Engineering principles
The parts that are hard to get right are decided on day one.
Secure by design
Least privilege, encrypted at rest and in transit, secrets out of code, and threat models before features.
Offline-first
Apps keep working without signal. Changes queue on the device and sync in order when it returns.
Accessible by default
Built to WCAG 2.2 AA from the first screen, not retrofitted before launch.
Observable
Every exception is captured with its context, so problems are fixed before users report them.
Tested, always
Warnings treated as errors, architecture rules enforced by tests, and suites that run on every build.
Open standards
OpenAPI, OAuth 2.0 and mainstream .NET, so you're never locked in to us or anyone else.
Public sector
Ready for public service.
Accessible, secure and built on open standards, delivered in agile phases that match how government buys and runs digital services.
- GDS Service StandardDiscovery, alpha, beta, live
- WCAG 2.2 AAPublic Sector Bodies Accessibility Regulations
- Secure by designOWASP ASVS and NCSC cloud principles
- UK GDPR and DPA 2018Privacy by design and by default
Have something important to build?
Tell us about it. You'll talk to the engineers who would build it, and you'll get a straight answer about scope, risk and timescales within one working day.