Expect a mix of platform-focused coding, mobile architecture design, healthcare security scenarios, and behavioral alignment. Prepare concise, example-rich answers that show depth and judgment.

Mobile Fundamentals (iOS/Android)

You’ll demonstrate platform fluency and practical engineering choices.

• How would you architect an offline-first feature that must resolve conflicts gracefully?
• Explain how you handle long-running background tasks within OS constraints.
• Walk through optimizing a screen with complex lists and images for low-end devices.
• Describe how you structure view models to keep business logic testable.
• What are your go-to tools and metrics for tracking app performance and stability?

System Design / Architecture

You’ll design scalable, observable, and secure mobile systems.

• Design push notification flows for time-sensitive health reminders with deep links.
• Propose a modularization strategy for a rapidly growing app with multiple teams.
• How would you enable safe A/B testing and phased rollouts for a risky feature?
• Design a sync pipeline for forms and attachments captured without connectivity.
• How do you design for secure, low-friction authentication on mobile?

Healthcare Domain & Security

Security and privacy are central; expect depth here.

• Outline how you prevent PHI leakage in logs, screenshots, and crash reports.
• Discuss token management, refresh, and device trust in a clinical app.
• What’s your approach to securing data at rest and in transit on mobile?
• How would you implement access controls for different clinical roles in-app?
• Describe how you’d integrate with FHIR-based APIs while minimizing data exposure.

Debugging & Problem Solving

We assess how you investigate and resolve real issues.

• A feature intermittently fails under poor connectivity—how do you root-cause it?
• Crash rate spikes after release; outline your triage, rollback, and fix plan.
• Notifications are delayed for some users; what’s your investigation workflow?
• Walk us through a difficult production incident you resolved and what changed after.
• How do you use analytics/metrics ethically to guide product decisions?

Behavioral / Leadership

We value ownership, clarity, and patient-centered decision-making.

• Tell us about a time you changed course after clinician/user feedback.
• Describe a technical decision you championed that improved reliability.
• How do you handle disagreement on security vs. UX trade-offs?
• Share how you mentor peers on code quality and testing.
• Describe a cross-team initiative you led from insight to measurable impact.

This timeline illustrates the typical progression from recruiter screen through technical, design, and cross-functional interviews, concluding with references and offer. Use it to pace your preparation: deepen platform fundamentals early, refine a mobile architecture portfolio before the design session, and assemble clear, metrics-backed stories for behavioral rounds.

Deep Dive into Evaluation Areas

Mobile Platform Mastery (iOS/Android)

This area verifies your fluency with native stacks and day-to-day engineering decisions. Expect hands-on coding and design discussions targeted to Swift/SwiftUI or Kotlin/Compose that evaluate readability, testability, and performance under real-world constraints.

• UI Architecture & State Management: MVVM/MVI, SwiftUI/Combine, Jetpack Compose/Flows, handling lifecycle and concurrency safely.
• Networking & Data: REST/GraphQL, pagination, caching, secure storage (Keychain/Keystore), offline-first sync strategies, retry/backoff.
• Performance & Reliability: measuring cold start, jank, memory usage; optimizing rendering; handling background tasks and constraints.
• Advanced concepts (less common): BLE/IoT device integrations, telehealth/media (WebRTC/AVFoundation/ExoPlayer), accessibility at WCAG AA+, background scheduling (WorkManager/BGTaskScheduler), in-app encryption.

Example questions or scenarios:

• "Design an offline-first patient checklist that syncs safely when connectivity is intermittent."
• "Refactor a view model with heavy business logic to improve testability and reduce crashes."
• "Diagnose a UI jank issue on a low-end device; what metrics and tools do you use and why?"

Security, Privacy, and Compliance in Healthcare

Given HIPAA and related regulations, you must demonstrate a security-first mindset. Interviewers probe how you minimize data exposure, secure transport and storage, and verify compliance without degrading user experience.

• Data Handling: PHI minimization, on-device encryption, secure logging/redaction, screen security, clipboard handling, jailbreak/root detection posture.
• Transport Security: TLS pinning strategies, cert rotation, secure OAuth2/OpenID Connect flows, token lifecycles.
• Access Controls: session management, biometric unlock patterns, timeout policies, role-based feature gating.
• Advanced concepts (less common): FHIR resource scopes, SMART on FHIR auth, MDM/AppConfig for enterprise distribution, audit trails for clinical apps.

Example questions or scenarios:

• "Implement secure messaging for patient questions; detail auth, encryption, and logging choices."
• "How do you prevent PHI leakage in crash reports and analytics?"

Mobile System Design and Integrations

We assess your ability to architect scalable, observable mobile systems that integrate cleanly with backend services and clinical platforms.

• App Architecture: modularization, feature isolation, dependency injection, design for experimentation.
• Sync & Conflict Resolution: queues, idempotency, optimistic vs. pessimistic updates, conflict policies.
• Observability: structured logging, metrics, crash reporting, distributed tracing handoff.
• Advanced concepts (less common): background job orchestration, real-time updates via WebSockets/Push, designing for multi-tenant clinical orgs.

Example questions or scenarios:

• "Propose an architecture for appointment reminders with push notifications, deep links, and calendar sync."
• "Design a resilient sync pipeline for forms captured in poor connectivity areas."

Testing, CI/CD, and Release Management for Mobile

Reliability depends on strong verification and disciplined delivery. We explore your approach to test strategies and safe releases.

• Testing Strategy: unit vs. integration vs. UI tests, snapshot tests, contract tests for APIs.
• Tooling & Pipelines: Gradle/Xcode build optimization, Fastlane, GitHub Actions/Bitrise/Jenkins, artifact management.
• Release Safety: feature flags, phased rollout, A/B testing, rollback strategies, monitoring SLIs/SLOs.
• Advanced concepts (less common): device farms for hardware fragmentation, security scanning in CI, SBOM/Supply-chain safeguards.

Example questions or scenarios:

• "Outline a release plan for a high-risk feature with a 2-week deadline and significant patient impact."
• "How do you structure tests to prevent regressions in authentication flows?"

Cross-Functional Collaboration and Clinical Communication

Effective mobile delivery in healthcare requires tight alignment with clinicians, operations, and compliance. Interviewers test clarity, empathy, and outcome orientation.

• Stakeholder Alignment: translating clinical workflows into user stories, validation via pilots.
• Decision-Making: trade-offs between UX, security, and delivery timelines.
• Incident Response: triage protocols, communication, and post-incident learning.
• Advanced concepts (less common): change management for clinical rollouts, training/support readiness, documentation for audits.

Example questions or scenarios:

• "A nurse reports delayed data in the app during evening shifts. How do you investigate and communicate findings?"
• "Describe a time you changed an approach after clinician feedback and what improved as a result."