Senior Engineer, Mobile Apps

Hex Trust, established in 2018, offers fully regulated institutional digital asset market services, custody, and staking to builders, investors, and service providers. Leveraging the expertise of veteran banking technologists and award-winning financial services leaders, Hex Trust continues to innovate with its proprietary institutional-grade platform, providing secure and integrated solutions. Hex Trust holds licenses and certifications ensuring 24/7 global coverage across Hong Kong, Singapore, Dubai, France, and Italy. This dedication is reflected in our significant growth, with offices in major markets throughout Asia, the Middle East, and Europe. Position Summary

We are looking for a Senior Mobile App Engineer who is passionate about building exceptional mobile experiences and is not afraid to leverage the latest AI-assisted development tools to work smarter and ship faster.

Your first mission will be to spearhead the migration of our two existing native applications — written in Swift (iOS) and Kotlin (Android) — into a single, unified cross-platform codebase. From day one you will work with a high degree of autonomy, collaborating directly with product managers, business stakeholders and designers, and you will be expected to drive technical decisions rather than wait for them.

Responsibilities Lead the Cross-Platform Migration

• Analyze the existing Swift (iOS) and Kotlin (Android) native apps and define a structured migration strategy to a single shared codebase (Flutter preferred).
• Deliver a high-quality, feature-complete cross-platform application that maintains the look, feel, and performance of the native originals.
• Identify and surface risks, propose trade-offs, and keep stakeholders informed throughout the migration.

AI-Augmented Development

• Use AI coding assistants (e.g. GitHub Copilot, Claude) to accelerate code generation, refactoring, and test authoring.

Leverage Figma-to-code workflows via MCP integrations to automatically scaffold UI components directly from designer handoffs.

• Write and maintain comprehensive unit and widget tests, using AI tools to maximise coverage with minimal overhead.
• Stay on the leading edge of AI tooling and proactively propose new techniques that improve team velocity.

Stakeholder Collaboration & Product Ownership

• Work directly with the product manager, business stakeholders, and designers — translating business needs into technical solutions without requiring exhaustive requirement documents.
• Proactively surface problems and ambiguities before they become blockers, and always come with proposed solutions and trade-offs.
• Participate in design reviews and provide early technical feedback to prevent costly late-stage rework.

Technical Excellence

• Own app architecture decisions — state management, navigation, data layer, and integration patterns.
• Enforce security best practices, particularly around authentication, data encryption, secure storage, and privacy compliance relevant to financial applications.
• Set and uphold code quality standards via code review, linting, and automated testing pipelines.
• Choose and evolve your own toolchain — we open to your suggestions and proposals

Must-Have

• 5+ years of professional mobile development experience.
• Hands-on expertise with Flutter and Dart; strong understanding of widget lifecycle, state management (Riverpod, Bloc, or similar), and platform channels.
• Solid experience with at least one native platform (Swift/iOS or Kotlin/Android) — you need a good understanding of the existing codebases you'll be migrating.
• Demonstrated use of AI coding tools in a professional context (code generation, test writing, or design-to-code pipelines).
• Proven ability to work autonomously, manage your own priorities, and communicate proactively with non-technical stakeholders.
• Strong problem-solving mindset — you identify issues early, think creatively, and propose concrete solutions.
• Proven track record of submitting and shipping apps to both the App Store and Google Play, including full ownership of the submission and approval process.

Nice-to-Have

• Experience in the financial sector, ideally in crypto, DeFi, or digital assets applications.
• Familiarity with MCP (Model Context Protocol) and Figma API integrations for automated UI code generation.
• Knowledge of security and compliance requirements in financial apps: end-to-end encryption, secure key storage, biometric authentication, GDPR/local privacy regulations.
• Contributions to open-source Flutter packages or a visible portfolio of published apps.

Tech Stack & Tools

We don't over-prescribe the toolchain — you'll have the freedom to choose and evolve it. Typical starting point:

Flutter / Dart

Swift

Kotlin

GitHub Copilot

Claude Code

Figma MCP

Riverpod / Bloc

CI/CD (GH Actions)

App Store / Play Store

Candidates who do not tick all the boxes are still encouraged to apply, those with less experience will still be considered for the position but with an adjustment to the level of seniority.

As one of the leading Web3 innovators, Hex Trust offers a front-row seat in the ever-changing blockchain & crypto industry. We genuinely believe that people are our greatest asset, and invest heavily so they’re best prepared to support our mission to unlock ownership in decentralized markets! You will be joining a company that is always committed to creating a supportive & inclusive environment that promotes personal and professional growth that furthers your success and drives innovation, collaboration, and passion in the blockchain space.

At Hex Trust, we are proud of our H.E.X . culture:

• Heart


• Empowerment


• Xcellence

Join us at Hex Trust and not only can you look forward to working with blockchain professionals to build the decentralized future, but also:

• Competitive Salaries & Bonuses


• Generous Amounts of Paid Time Off (incl. leave for Birthdays, Work Anniversary, and Mental Health etc.)


• Medical & Retirement Plans


• Professional Learning and Development Opportunities


• Elevate your work using cutting-edge technology


• Fun & friendly office spaces in Hong Kong, Singapore, Dubai and Vietnam


• Regular company & social events

Hex Trust is an equal-opportunity employer devoted to diversity and inclusion in the workplace. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status or disability status.