Monimoore

Maintaining consistent portfolio state and balance accuracy under high-frequency market data updates, while meeting open banking compliance requirements for account connectivity.

Built an investment-oriented mobile experience for holdings visibility, performance insights, and account actions. The core challenge was maintaining consistency of balances and portfolio state while handling high-frequency data updates. The delivery approach emphasized deterministic state transitions, operational observability, and clear user disclosures for sensitive financial actions.

One team, one codebase, shipping the same account-connectivity and portfolio experience to both platforms — maintaining two native codebases for the same regulated flows wasn't realistic for a lean team.

The hardest part was integrating financial data through external APIs while keeping the mobile experience smooth — those providers don't always respond consistently, so handling retries, failures, and inconsistent response shapes mattered as much as building the happy path.

We accepted a more complex client architecture in exchange for isolating API communication, state management, and presentation logic from each other. That was more upfront work, but it kept the app maintainable as new financial features were added on top.

Deployed to production. Serves investment portfolio visibility and account management across European and African markets.

External integrations should never be treated as fully reliable. Building robust error handling and recovery in from the start saves far more time later than retrofitting it after the fact.