At a glance
- Client / partner
- Aura Finance
- Industry
- Fintech
- Services offered
- Dedicated Engineering Pod
- Web & Mobile Development
- Security Engineering
- Cloud Architecture
- Tech stack used
- Native mobile
- Biometric auth
- Rebalancing engine
- Event-driven services
- Encrypted storage
- Audit logging
Aura Finance is a fintech company building a modern wealth management app.
A Zemotify pod of six engineers and a security lead architected the app: biometric authorisation, algorithmic portfolio rebalancing and a fast, responsive experience.
Introduction
People want to manage their money with the same ease as any other app, but they also need to trust it completely. In wealth management those two needs pull in opposite directions: every extra security step adds friction, and every shortcut adds risk.
Aura Finance set out to remove that trade-off, with sign-in and approvals that feel effortless and portfolios that stay on target without the investor having to watch them.
They needed a team that could build the app and its money-moving core together, with security leadership embedded from day one.
The challenges
Building trust into a money app means getting hard engineering and security decisions right from the start:
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Strong security that feels effortless
Sign-in and approval of sensitive actions had to be secure without forcing investors through passwords and codes every time.
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Rebalancing without surprises
Automated rebalancing must follow each investor’s targets and rules, explain what it did, and never act on stale prices.
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Responsiveness
Portfolio values and actions had to feel immediate, even while calculations and checks run behind the scenes.
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Regulatory expectations
Financial services carry obligations for record-keeping, suitability and auditability that shape the architecture.
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Protecting sensitive data
Identity, holdings and transaction data needed encryption, strict access control and clear audit trails.
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Consistency under failure
Orders, balances and portfolio state had to stay correct even when a downstream service is slow or unavailable.
The approach
We designed security and correctness into the core, so the app could stay simple on the surface:
Biometric authorisation
Device biometrics unlock the app and approve sensitive actions, backed by secure device binding and server-side checks, so the fast path is also the safe one.
An explainable rebalancing engine
Rebalancing runs against each investor’s target allocation and rules, validates prices before acting and records every decision so it can be explained and audited.
Event-driven portfolio state
Orders, fills and balance changes flow through events with idempotent handling, keeping portfolio state consistent even when services retry.
A responsive client experience
Optimistic interface updates and pre-computed views keep the app feeling instant while authoritative calculations complete.
The systems behind every portfolio
How security, money movement and the app experience fit together.
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Biometric Auth
Device-bound biometric sign-in and approvals with server verification.
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Rebalancing Engine
Rule-driven rebalancing with price checks and an explanation for every trade.
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Portfolio Events
Idempotent event handling that keeps balances and holdings consistent.
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Encrypted Data
Sensitive data encrypted at rest and in transit, with least-privilege access.
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Audit Trail
Every sensitive action and automated decision recorded for review.
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Monitoring
Alerting on failed orders, slow dependencies and unusual activity.
Security leadership embedded in the pod
A dedicated security lead reviewed designs, threat-modelled new features and owned security testing as part of every release.
Compliance-ready by design
Record-keeping and audit requirements were captured as engineering requirements, not left for a pre-launch review.
A delivery rhythm built on trust
Regular releases, demos and transparent progress kept Aura’s leadership close to every decision.
The outcome
Outcomes are described qualitatively until verified figures are confirmed with the client:
Effortless, secure access: biometric sign-in and approvals across the app.
Portfolios that stay on target: automated, explainable rebalancing against each investor’s rules.
Correct under pressure: event-driven portfolio state that stays consistent through retries and failures.
Audit-ready: a complete trail of sensitive actions and automated decisions.
- Pending verification
App response time
- Pending verification
Rebalancing accuracy
- Pending verification
Security review findings
Technology used
An illustrative view of the toolchain used for this kind of build (to be confirmed with the project team):
| Mobile | Native iOS and Android clients with platform biometrics |
|---|---|
| Backend | Event-driven services with idempotent order handling |
| Portfolio Engine | Rule-based rebalancing with price validation |
| Data | Relational ledger with encrypted storage |
| Security | Device binding, secrets management, regular penetration testing |
| Compliance | Immutable audit logging and access reviews |
| Observability | Tracing, alerting and anomaly monitoring |
