Avinash Ranjan
Hire a freelance mobile & full-stack developer with 12+ years of product and service experience. I build iOS, Android, Flutter & React Native apps, web frontends, and Node.js REST/GraphQL APIs and backends—from MVP to App Store & Play Store launch.
- Implemented payment integrations (Braintree) plus secure VPN/proxy automation with C++/JNI.
- Delivered audio/video calling via Amazon Chime and Twilio, handling one-to-one and group sessions.
- Hands-on with BLE/USB medical devices, offline sync, and performance tuning using profiling and LeakCanary.
What I can build for you
End-to-end product delivery—mobile, web, and backend—for startups and teams hiring a reliable freelance developer for US, remote, and global projects.
Mobile App Development
Native iOS (Swift) & Android (Kotlin/Java) plus cross-platform Flutter and React Native apps—built for performance, offline reliability, and App Store & Play Store launch.
Web Development
Responsive, fast web frontends and dashboards with React/Next.js, wired cleanly to your APIs with maintainable, well-tested code.
API & Backend
Node.js/Express REST and GraphQL APIs, secure auth (JWT/OAuth/AWS Cognito MFA), databases, and cloud deployment with CI/CD.
Delivery strengths
Leading mobile builds in fintech and healthcare, with deep work in security, automation, and media stacks.
12+ yrs
Android-first engineer delivering cross-platform apps since 2013.
Architect/Lead
Defines MVVM/MVI/Clean architectures and mentors engineering teams.
Security & media
AES/SMALI reviews, VPN/JNI, Amazon Chime & Twilio for AV flows.
Automation
Espresso + ADB tool capturing 58-language UI screenshots for quality.
Android Core
Kotlin/Java · Compose · Jetpack
Retrofit/Hilt, coroutines/flows, offline sync, profiling with LeakCanary.
Flutter SDKs
Platform channels · Reusable modules
Flutter banking SDKs with native bridges for device capabilities.
React Native
Native modules · Cross-platform
Delivered RN apps with native integrations and performance fixes.
KMM & Shared Code
Shared business logic
Kotlin Multiplatform for shared healthcare features.
Security & Crypto
AES · SMALI · Pen tests
Encryption, SMALI analysis, and secure signing pipelines.
Automation & QA
Espresso · Appium · MCP
58-language screenshot harness and MCP-triggered test runs.
Audio/Video & RTC
Amazon Chime · Twilio
AV calling, wake-word, and custom gain pipeline.
IoT & Hardware
BLE · USB · OBD-II
Medical device and vehicle diagnostics integrations.
CI/CD & Delivery
Jenkins · GitLab · Gradle
Release automation and guardrails for mobile apps.
Architecture & Leadership
MVVM · MVI · Clean
Technical leadership, code reviews, UML/system design.