Your React Native App Development Agency — Custom Code, No Technical Debt
BATSTACK is the offshore engineering team UK founders and CTOs trust for React Native, Flutter, and native builds. 100% custom codebase, native-grade performance, and a shared Git + Jira workflow — MVPs shipped in 4–6 weeks, mornings overlapping your London working day.
Engineering-first — not another bloated London agency
100% custom codebase
Clean, tested React Native / Flutter code — no templated shortcuts, no proprietary black boxes. Zero vendor lock-in.
Native-grade performance
Sub-second API responses and 60fps UI held to a strict performance budget, not treated as a nice-to-have.
Radical transparency
GitHub repo, Jira board, and a Slack channel from sprint one — review every commit and pull request as it lands.
Costed scope before code
A fixed sprint plan out of Discovery. MVP in 4–6 weeks or a phased enterprise roadmap — no scope-creep invoices.
London-grade engineering, offshore economics
Senior engineers at a Sri Lankan cost base — your budget buys product, not agency overhead.
The full engineering stack — mobile to cloud
Cross-Platform Excellence
React Native and Flutter for a single maintainable codebase across iOS and Android; native feel, one team, faster iteration.
Native Mobile
Native iOS (Swift) and Android (Kotlin) when you need platform-perfect performance and deep hardware access.
Resilient Microservices & APIs
Node.js, Go, GraphQL, and PostgreSQL backends engineered for scale, real-time sync, and offline-first mobile.
Enterprise Security & Cloud
AWS + Cloudflare, CI/CD, automated testing, and UK GDPR-aligned data-handling practices. Encrypted in transit and at rest.
A transparent 4-phase delivery framework
Discovery
A 30-minute technical discovery call becomes a costed scope — user flows, architecture, tech-stack decisions, and a fixed sprint plan. You leave knowing exactly what, when, and how much.
Interactive Prototype
A clickable, real-data prototype before full engineering begins — so you validate the product and align stakeholders before the expensive part starts.
Agile Sprint Engineering
Weekly sprints, demoed live. Every sprint ships working software to a staging build you can install, with full Git + Jira transparency throughout.
Deployment & SLA Support
Store submission, production launch on AWS/Cloudflare, monitoring, and a defined post-launch SLA for maintenance, updates, and scaling.
What will your build actually take?
Engineering estimates confirmed in Discovery; App Store review time excluded.
| MVP / Launch | Full-Scale Enterprise | |
|---|---|---|
| Timeline | 4–6 weeks | 12–16 weeks+ |
| Scope | Core flows, cross-platform, single backend | Multi-module, RBAC, integrations, admin portal |
| Stack | React Native / Flutter + Node/PostgreSQL | Native + microservices (Go/Node), GraphQL, multi-region cloud |
| Best for | Founders validating a market | Funded scale-ups & mid-market enterprises |
| You get | Store-ready app + repo + docs | Platform + SLA + dedicated squad |
Frequently asked questions
Who owns the IP and source code?
You own 100% of the IP and source code. On final payment, all code and design assets transfer to you in writing, and you hold the GitHub repository from day one — no lock-in, ever.
How does the time-zone difference work with the UK?
Sri Lanka is UTC+5:30, about 4.5–5.5 hours ahead of GMT/BST. Our working hours overlap your London morning and early afternoon, giving a reliable daily window for standups, reviews, and demos.
Do we get repository access during the build?
Yes — GitHub repo, Jira board, and Slack from the first sprint. You review every commit, pull request, and staging build in real time.
Are you compliant with UK GDPR and data-protection expectations?
We follow GDPR-aligned data-handling: encryption in transit and at rest, least-privilege access, and data-residency choices via AWS UK/EU regions where required. We’ll sign the DPA your project needs.
What does post-launch support look like?
A defined SLA covering bug fixes, iOS/Android version updates, security patches, and feature iterations — on a monthly retainer or sprint-by-sprint.
Ready to build your app?
Book a 30-minute technical discovery call — you’ll leave with a costed scope, a stack recommendation, and a fixed sprint plan.
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