Mobile App Developer – Flutter

Company: GreenSigma Consultancy Pvt. Ltd.Product: Sigma Scanner (WealthTech SaaS Platform)Location: Chennai (Preferred)Employment Type: Full-TimeExperience: 2–5 YearsWe are looking for a skilled Mobile App Developer to build and scale the Sigma Scanner mobile application.The mobile app will act as a command centre for systematic investors. It will help users monitor portfolios, receive rebalance alerts, review entry and exit recommendations, execute portfolio changes, access Sigma AI and manage their subscriptions.The role requires strong mobile engineering skills, product thinking and the ability to build a premium, secure and reliable fintech application.Key ResponsibilitiesBuild and maintain the Sigma Scanner mobile application using Flutter.Develop applications for both Android and iOS from a shared codebase.Create a modern, premium and responsive mobile user experience.Build signup, login, onboarding and authentication flows.Develop portfolio dashboards, strategy summaries and performance views.Display stock, ETF and mutual fund scores, ranks and recommendations.Build entry, exit and rebalance notification workflows.Integrate broker APIs for order placement and portfolio execution.Integrate backend APIs, payment gateways and subscription systems.Build push notifications for portfolio actions, rebalance events and important updates.Integrate Sigma AI chatbot for customer support, product discovery and strategy assistance.Implement secure storage, session management and data protection.Handle real-time order status, execution updates and portfolio changes.Work closely with backend developers, designers, product managers and the founding team.Convert product requirements and Figma designs into production-ready applications.Write clean, reusable and maintainable code.Test, debug and optimise the application across devices and operating-system versions.Manage Play Store and App Store deployment, releases and updates.Monitor crashes, performance issues and user behaviour after launch.Initial Product ScopeThe first version of the mobile app will include:Signup and loginUser onboardingSubscription and payment managementPortfolio dashboardPortfolio score and health overviewStrategy summaryCurrent stock ranksEntry and exit recommendationsUpcoming rebalance dateRebalance alertsOne-click portfolio executionOrder and execution statusPerformance comparison against benchmarkSigma AI chatbotCustomer supportBook-a-demo functionalityETF and mutual fund module previewsAdvanced strategy creation and detailed backtesting will continue to remain primarily on the web platform during the initial phase.Required Skills2–5 years of mobile application development experience.Strong experience with Flutter and Dart.Experience publishing production applications on the Google Play Store and Apple App Store.Strong understanding of Flutter architecture and state management.Experience with Riverpod, Bloc, Provider or similar state-management frameworks.Strong knowledge of REST APIs, JSON and asynchronous programming.Experience with Firebase services, including push notifications, analytics and crash reporting.Experience with secure authentication, token management and local storage.Knowledge of responsive layouts and mobile UI development.Experience integrating payment gateways and third-party SDKs.Familiarity with Git, code reviews and modern development workflows.Ability to write scalable, maintainable and testable code.Strong debugging and problem-solving skills.Preferred SkillsExperience building fintech, broking, trading, wealth-management or investment applications.Experience integrating broker or trading APIs.Knowledge of stock-market portfolios, order execution, rebalancing and investment workflows.Experience with charts, financial data and portfolio analytics.Familiarity with WebSockets and real-time data updates.Experience with biometric authentication.Understanding of mobile application security and financial-data protection.Experience with CI/CD pipelines for mobile applications.Basic knowledge of native Android or iOS development.Experience working in an early-stage startup or product company.What We ExpectStrong ownership from development to production deployment.Ability to understand business requirements, not just complete assigned screens.Attention to user experience, performance and application reliability.Ability to work independently and communicate blockers early.Willingness to improve existing product flows and suggest better solutions.Focus on building a simple product rather than adding unnecessary complexity.Commitment to protecting sensitive customer and financial information.Success MetricsYour performance will be evaluated based on:Successful launch of the Android and iOS applications.Application stability and crash-free user rate.Speed and reliability of portfolio and order workflows.Rebalance notification-to-execution conversion.User activation and repeat application usage.Quality and maintainability of the codebase.Timely delivery of product releases.App Store and Play Store ratings and user feedback.Why Join GreensigmaBuild a fintech product used by thousands of retail investors.Work directly with the founders and core product team.Own the mobile application from its early stage.Solve meaningful problems across investing, portfolio management and execution.Work on stocks, ETFs, mutual funds and AI-driven investment experiences.Opportunity to grow into a Lead Mobile Developer or Mobile Engineering Head as the product scales.Application ProcessInterested candidates can share the following:Updated resumeCurrent and expected compensationNotice periodLinks to published Android or iOS applicationsGitHub or portfolio link, where availableBrief explanation of their role in previously developed applications