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Custom iOS, Android & React Native Apps Built for Scale

From concept to code — RSVR Tech designs, builds, and scales mobile applications for startups, scale-ups, and enterprises.

Our full-service mobile app development offering covers iOS, Android, React Native, and Flutter, with UI/UX design, backend systems, and scalable architecture tailored to your goals and infrastructure.

  •  iOS and Android app development
  • Cross-platform builds in React Native and Flutter
  •  UI/UX design for mobile screens
  •  Backend & API integration
  •  Flexible engagement models

Choose the Model That Fits Your Business

We work across three flexible collaboration models — or blend them to match your needs.

Full Ownership — Design to Deployment

We handle everything: mobile app design, development, backend setup, APIs, and deployment.

Used by:

Ideal for founders and product teams who want an experienced tech partner from day one.

Take Over from an Existing Vendor

Not happy with your current dev agency? We take over existing codebases, improve performance, and deliver.

Used by:

Ideal for companies needing to rescue, upgrade, or revive a mobile app.

Collaborate as an Extension of Your Team

Already have developers in place? We’ll plug into your team as senior collaborators to support scaling, QA, or feature delivery.

Used by:

Ideal for scale-ups and enterprises needing speed, skill, or reliability.

Not Sure What You Need?

We’ll help you figure it out. Most of our clients use a hybrid model, starting with a takeover and evolving into a long-term product partnership.

 Why Teams Choose RSVR for Mobile App Development

As a mobile application development services company, RSVR Tech delivers strategic support and scalable mobile architecture for every stage of the product lifecycle. We provide mobile application development solutions that integrate design, backend systems, and seamless user experience across iOS and Android.

  • Cross-platform expertise (iOS, Android, React Native and Flutter)
  • Fully designed app interfaces — no external UI agency needed
  • API development & backend support
  • Modular delivery with weekly demos
  • UK-based team with experience across industries
  • Transparent pricing, flexible engagement

40+ years of experience across NHS, Fidelity, and high-growth startups.
Led by our founder and supported by a senior team across iOS, Android, Flutter, Laravel, React, and AI — we bring strategic product guidance and deep technical capability.

Featured Mobile App Projects

  • Carbon Emissions Tracker – took over an existing app and built it out across iOS, Android, and React Native
  • Perfume Database – consumer app with filters, reviews, and wishlist functionality
  • PropTech Venture – tenant-landlord mobile platform with search, messaging and document management features

Ready to Build or Scale Your Mobile App?

Looking for a mobile app design and development services partner that delivers on time and scales with your business?Whether you’re launching from scratch or optimising an existing product, RSVR Tech delivers mobile application development solutions tailored to your vision and workflow.

FAQs

How does RSVR compare to other mobile phone application development companies?
We focus on strategic collaboration and long-term scalability, rather than transactional builds. Many of our clients partner with us beyond launch to continuously evolve their product.
What platforms do you develop for?
We develop mobile applications for iOS and Android using native and cross-platform frameworks like React Native.
Can RSVR design the mobile app UI/UX too?
Yes — we provide full UI/UX design as part of our mobile app development services, or as a standalone offering.
Do you take over from other vendors?
Yes. We’ve helped clients transition from legacy vendors and stabilised/improved their existing applications.
How do you collaborate with in-house teams?
We work as an extension of your team — joining sprint cycles, supporting architecture, or handling specialist tasks like APIs, DevOps or QA.

Why RSVR Tech?
We partner with early-stage and scaling startups to build modular, cloud-native systems tailored for scale. From architecture audits to MVP engineering and long-term infrastructure planning, RSVR Tech helps you scale smart—without starting over.

Identifying the Right Tech Partner for Your Startup

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