Senior Engineer, Mobile Apps
Hex Trust offers fully regulated institutional digital asset Custody, Staking and Markets services to builders, investors and service providers.
Projects
About Hex Trust
Hex Trust is a digital asset custodian that provides fully regulated institutional digital asset services, including Custody, Staking, and Markets, catering to builders, investors, and service providers. Their offerings encompass Full Custody, Escrow, Enterprise Reassignment, comprehensive Staking Services, Validator-as-a-Service, OTC trading, and Financing. The platform is built on security-first infrastructure with integrated features for KYC, AML, and other global regulatory compliance, supporting a wide array of blockchains and asset standards. The company has offices in Hong Kong, Singapore, Vietnam, Dubai, and Italy.
Skills
About the Role
You will spearhead the migration of two native apps into a single cross-platform codebase, working autonomously to define strategy, make architecture decisions, and deliver production-ready mobile features. You will use AI-assisted tools and Figma-to-code workflows to accelerate development, write comprehensive tests, enforce security and quality standards, and collaborate directly with product managers, designers, and stakeholders to translate requirements and resolve risks.
Requirements
- 5+ years of professional mobile development experience
- Hands-on expertise with Flutter and Dart, including widget lifecycle and platform channels
- Strong understanding of state management (Riverpod, Bloc, or similar)
- Solid experience with at least one native platform (Swift/iOS or Kotlin/Android)
- Demonstrated professional use of AI coding tools for code generation, test writing, or design-to-code pipelines
- Proven ability to work autonomously, manage priorities, and communicate with non-technical stakeholders
- Strong problem-solving mindset with proactive issue identification and solution proposals
- Proven track record of submitting and shipping apps to both the App Store and Google Play
- Experience in the financial sector, ideally crypto, DeFi, or digital assets (nice to have)
- Familiarity with MCP and Figma API integrations for automated UI code generation (nice to have)
- Knowledge of security and compliance for financial apps including end-to-end encryption, secure key storage, biometric authentication, and GDPR (nice to have)
- Contributions to open-source Flutter packages or a visible portfolio of published apps (nice to have)
Responsibilities
- Lead the cross-platform migration to a shared Flutter codebase
- Analyze Swift and Kotlin codebases and define a structured migration strategy
- Deliver a feature-complete cross-platform application that preserves native performance and UX
- Identify risks, propose trade-offs, and keep stakeholders informed
- Use AI coding assistants to accelerate code generation, refactoring, and test authoring
- Leverage Figma-to-code workflows to scaffold UI components from designer handoffs
- Write and maintain comprehensive unit and widget tests
- Collaborate with product managers, business stakeholders, and designers to translate needs into technical solutions
- Participate in design reviews and provide early technical feedback
- Own app architecture decisions including state management, navigation, and data layer
- Enforce security best practices around authentication, encryption, secure storage, and privacy
- Set and uphold code quality standards via code review, linting, and automated testing pipelines
- Manage app submission and release processes for App Store and Google Play
Benefits
- Competitive salaries and bonuses
- Generous paid time off including birthday, work anniversary, and mental health leave
- Medical and retirement plans
- Professional learning and development opportunities
- Access to cutting-edge technology
- Fun and friendly office spaces in Hong Kong, Singapore, Dubai, and Vietnam
- Regular company and social events