React Native · Expertise hub
React Native Expert
Direct answer
A React Native expert is a senior engineer who owns the decisions that determine whether a mobile app survives scale — architecture, the New Architecture (Fabric, TurboModules, JSI), performance profiling, native module authoring, security, and release engineering with EAS and over-the-air updates — not just someone who can assemble screens. The strongest React Native experts also own the backend (Python/FastAPI) and AI layer, which removes the handoff gaps where most mobile projects stall. I'm Dhairya Senjaliya: 7+ years, 20+ App Store launches, Guest Engineer at Expensify, apps used by millions.
What separates an expert from a developer
Anyone can build a React Native screen — the framework does most of the work, and a weekend tutorial gets you a running app. The gap between that and an expert shows up three months in, when the app that felt fine with fifty demo items drops frames on five thousand real ones, when a store review rejection blocks the launch, when the “random” crash in production turns out to be a token stored in the wrong place. Expertise is the accumulated scar tissue from having already shipped through those failures.
Concretely, a React Native expert owns the whole lifecycle: the architecture that keeps a codebase navigable past two hundred screens, the New Architecture internals (Fabric, TurboModules, JSI, Hermes) that most teams ship on defaults, performance profiling on real mid-range devices, native module authoring when the ecosystem falls short, security and compliance for regulated data, and the release engineering — EAS pipelines, over-the-air updates, staged rollouts — that turns a build into a product. The map below is the full surface, and every link goes to a guide where I work through it in depth.
The React Native expertise map
Architecture
The decisions made in week one that determine whether the codebase is still maintainable at 200 screens. Folder structure, navigation, state, and module boundaries.
The New Architecture & internals
Fabric, TurboModules, JSI, and Hermes — what the new architecture actually changes, and how to tune the engine most teams ship on defaults.
Performance
Where 'React Native feels slow' actually comes from — and the audit-grade fixes. Lists, bundle size, memory, startup, and 60fps animation.
Expo, CI/CD & releases
Modern React Native ships on Expo and EAS. Build pipelines, over-the-air updates, deep linking, and push at scale — the release engineering that separates hobby apps from products.
Security & compliance
Token storage, transport security, and the compliance surface for fintech and healthcare apps — the checks I run before an app touches regulated data.
Reliability & offline
Crash recovery, error boundaries, and offline-first data — the difference between an app that works in the demo and one that survives a subway tunnel.
Integration & migration
Bringing React Native into an existing native codebase, migrating off native, and wiring the backend — including the Python/FastAPI and AI systems behind the app.
Hiring & decisions
The buyer's side: how to hire, what it costs, when React Native is the wrong call, and how it compares to Flutter and native.
One owner for mobile, backend, and AI
The most expensive gaps in a mobile project are the seams between people — the app team waiting on the API team, the API team waiting on whoever owns the AI feature. I collapse those seams by owning the full stack: React Native on the front, Python and FastAPI on the back, and AI systems (RAG, LLM integrations, agents) in between. When the login flow, the token refresh endpoint, and the streaming AI response are all authored by one person, the integration bugs that eat weeks simply never happen.
For a startup, that means one senior hire covers what would otherwise be a small team. For a CTO, it means a single point of ownership for the mobile product and the systems behind it — fewer handoffs, faster shipping, and architecture decisions made by someone who sees the whole picture.
Ways to work together
Frequently asked questions
What makes someone a React Native expert versus just a developer?
A React Native developer can build screens; an expert owns the decisions that determine whether the app survives scale — architecture, the New Architecture (Fabric, TurboModules, JSI), performance profiling, native module authoring when the ecosystem falls short, release engineering with EAS and OTA, and knowing when React Native is the wrong tool. Expertise shows in the failure modes they've already lived through, not the tutorials they've read.
How much does it cost to hire a React Native expert?
Rates vary by region and seniority, but a genuine senior/expert commands a premium over a general developer because one of them replaces a small team: they own mobile, often the backend, and the architecture decisions. Most production React Native engagements I take fall in the $25K–$150K range depending on scope. The cost of the wrong hire — a rewrite — is almost always higher than the premium for the right one.
Can a React Native expert also build the backend and AI features?
The strongest ones can, and it collapses coordination overhead. I ship React Native on the front, Python/FastAPI on the back, and AI features (RAG, LLM integrations, agents) under one owner — which means no handoff gaps between the app, the API, and the AI. For a small team, one senior full-stack owner beats three coordinated specialists.
How do I verify a React Native expert's experience before hiring?
Ask for shipped apps you can download from the stores, then probe the unglamorous competencies: how they've handled store rejections, the worst production crash they've debugged, how they profile performance, and when they'd write a native module. Real experts answer instantly with specifics. Public code (open-source contributions, a portfolio of production apps) is the strongest signal.
Need a React Native expert on your app?
30-minute scoping call · Clear milestones · Senior engineer ownership