Senior Flutter Developer / Mobile Application Engineer
Experience: 10+ years in software/mobile application development, including 5+ years of production Flutter developmentProduct: Large-Scale Social Media and Content PlatformEmployment Type: Full-Time
Position Overview
We are looking for a highly experienced Senior Flutter Developer to help build, optimize, and scale a feature-rich social media application.
This is not a UI-only development position. The successful candidate must understand complete mobile product architecture, real-time communication, media processing, performance optimization, security, automated testing, deployment, and production monitoring.
The developer will take end-to-end ownership of major features and collaborate with backend developers, UI/UX designers, QA engineers, product managers, and infrastructure teams.
Mandatory Experience
Candidates must have:
- 10+ years of overall software or mobile application development experience
- 5+ years of hands-on production experience with Flutter and Dart
- Proven experience building and maintaining large, production-ready mobile applications
- Experience working on a live social media, community, video, creator, marketplace, or content-based application
- Experience publishing and maintaining applications on both the Apple App Store and Google Play Store
- Experience working with an existing large codebase and improving its architecture, performance, and maintainability
- Demonstrated ownership of features from technical planning through production release and monitoring
Flutter and Mobile Architecture
- Advanced knowledge of Flutter, Dart, widgets, rendering, isolates, streams, asynchronous programming, and application lifecycle
- Strong understanding of native Android and iOS architecture
- Ability to write or modify native Kotlin, Java, Swift, or Objective-C code when necessary
- Strong experience with scalable state management such as Riverpod, BLoC/Cubit, Provider, Redux, or an equivalent solution
- Ability to evaluate and select the appropriate state-management approach
- Strong understanding of Clean Architecture, SOLID principles, dependency injection, modular architecture, and design patterns
- Experience building reusable design systems, component libraries, and shared application modules
- Experience with Flutter build flavors, environment management, feature flags, and remote configuration
- Experience with deep links, universal links, app links, and navigation architecture
- Knowledge of localization, internationalization, accessibility, and responsive layouts
Social Media Features
The candidate must have experience implementing several of the following:
- Personalized content feeds
- Short-form videos and reels
- Stories and temporary content
- User profiles and account management
- Following, followers, blocking, reporting, and privacy controls
- Likes, reactions, comments, replies, mentions, hashtags, and sharing
- Content discovery, search, categories, and recommendations
- In-app messaging and group chat
- Push and in-app notifications
- Creator tools and content publishing
- Drafts, scheduled posts, bookmarks, and saved content
- Live engagement, viewer counts, reactions, moderation, and reporting
- Infinite scrolling, pagination, prefetching, and feed caching
- Content moderation and community-safety workflows
Video, Audio and Media Experience
Strong experience is required in:
- Video playback and adaptive streaming
- HLS, WebRTC, or similar streaming technologies
- Video and audio recording
- Camera and microphone integration
- Video trimming, cropping, editing, and merging
- Filters, effects, stickers, overlays, and beauty effects
- Audio synchronization and voice effects
- Media compression and transcoding workflows
- Thumbnail generation and media previews
- Background and resumable uploads
- Image and video upload progress
- Media caching and preloading
- Handling large files and unstable network connections
- Secure media URLs and access control
- Device permissions and platform-specific media behavior
Experience with LiveKit, Agora, WebRTC, FFmpeg, AVFoundation, ExoPlayer, or similar technologies is highly preferred.
API and Real-Time Integration
- Advanced experience integrating REST APIs
- Experience with WebSockets, Socket.IO, GraphQL subscriptions, or other real-time technologies
- Strong knowledge of JSON serialization, authentication, pagination, caching, retries, and error handling
- Experience with OAuth 2.0, JWT, token refresh, and secure session management
- Ability to implement offline and poor-network support
- Experience handling API versioning and backward compatibility
- Knowledge of background services, background uploads, and background notifications
- Ability to coordinate mobile implementation with backend API contracts
Performance and Scalability
The candidate must be able to identify, measure, and resolve performance problems involving:
- Slow application startup
- Dropped frames and UI jank
- Excessive widget rebuilding
- High memory or battery usage
- Memory leaks
- Large feeds and media-heavy lists
- Network latency and excessive API requests
- Video buffering and playback failures
- Image loading and caching
- Background processing
- Application size
- Low-end device performance
Experience using Flutter DevTools, Android Profiler, Xcode Instruments, Firebase Performance Monitoring, or similar tools is required.
Testing and Code Quality
- Strong experience writing unit, widget, integration, and end-to-end tests
- Ability to establish code-review and engineering standards
- Experience with testable architecture, mocking, and dependency injection
- Strong knowledge of static analysis, linting, formatting, and code-quality tools
- Ability to review pull requests and mentor other mobile developers
- Experience refactoring legacy code without disrupting production functionality
- Ability to write clear technical documentation and architecture decisions
Git, CI/CD and Release Management
- Advanced knowledge of Git, GitHub or GitLab
- Experience with professional branching, pull-request, code-review, and release strategies
- Experience building CI/CD pipelines for automated testing, builds, signing, and deployment
- Experience with tools such as GitHub Actions, GitLab CI, Codemagic, Fastlane, or equivalent
- Strong understanding of Android and iOS certificates, signing, provisioning, and release processes
- Experience managing development, staging, UAT, and production environments
- Experience with phased releases, rollback planning, and emergency production fixes
- Experience managing App Store and Google Play review requirements
Firebase and Production Monitoring
Experience with the following is strongly preferred:
- Firebase Cloud Messaging
- Crashlytics
- Firebase Analytics
- Remote Config
- Firebase Performance Monitoring
- Dynamic Links or equivalent deep-linking solutions
- Sentry or another error-monitoring platform
- Product analytics and event-tracking systems
- Production logging and diagnostic tools
Security Requirements
- Secure token, credential, and local-data storage
- Encryption of sensitive data
- Secure API and network communication
- Certificate pinning where appropriate
- Rooted and jailbroken device considerations
- Prevention of secrets being embedded in application code
- Protection against common mobile security vulnerabilities
- Understanding of OWASP Mobile Application Security principles
- Knowledge of privacy, user consent, camera, microphone, location, and data-retention requirements
Leadership and Ownership
The successful candidate must be able to:
- Convert product requirements and Figma designs into scalable technical solutions
- Estimate work accurately and identify technical dependencies
- Take end-to-end ownership of assigned modules
- Make and document sound architectural decisions
- Review code and support junior and mid-level developers
- Troubleshoot complex production problems
- Communicate risks, blockers, and progress clearly
- Collaborate effectively with backend, QA, design, infrastructure, and product teams
- Balance delivery speed with performance, security, and maintainability
- Think beyond individual screens and understand the complete product flow
Preferred Qualifications
Preference will be given to candidates with:
- A live social media or media application available in the App Store or Google Play
- Experience supporting applications with a large number of active users
- Experience with feeds, reels, live streaming, chat, notifications, or media processing
- Experience leading or mentoring a mobile development team
- Experience with microservices-based backend systems
- Experience integrating analytics, moderation, payments, subscriptions, or advertising
- Experience with application accessibility and internationalization
- A degree in Computer Science, Software Engineering, or a related field
Required Application Information
Applicants must provide:
- Updated résumé
- GitHub, GitLab, portfolio, or code samples
- Links to live Flutter applications they personally helped build
- Exact explanation of their contribution to each application
- Number of years working with Flutter and Dart
- Number of years working with native Android or iOS
- Examples of social media, video, chat, live streaming, or real-time features they implemented
- Description of the largest application or user base they supported
- Current notice period and availability
Technical Evaluation Process
Shortlisted candidates should complete:
- Technical résumé and portfolio review
- Flutter, Dart, architecture, and performance interview
- Code-review or debugging exercise
- Practical assignment based on a small social media feature
- Final interview covering ownership, communication, security, and scalability
Any practical assignment should be short, relevant, and designed to evaluate code quality, architecture, testing, performance, and problem-solving—not merely UI replication.
Core Skills
Flutter | Dart | Native Android/iOS | Clean Architecture | Riverpod/BLoC/Provider | REST APIs | WebSockets | WebRTC | Video and Media Processing | Real-Time Features | Performance Optimization | Automated Testing | Git | CI/CD | Firebase | Mobile Security | App Store Deployment
Pay: From ₹30,000.00 per month
Work Location: Remote
