Senior Mobile Developer (React Native / Android Migration)

Role summary

Were looking for a Senior Mobile Developer with strong Android (Kotlin) and React Native experience to lead/execute the migration of a native Android app to React Native, integrating with AWS services for an Industrial IoT solution focused on OEE and plant KPIs. Youll work with a cross-functional team (IoT/Backend/Data/QA) to deliver a mobile experience thats robust, secure, scalable, and reliable in industrial environments.

Objectives

• Assess the current Android app (architecture, modules, dependencies, critical flows, analytics) and define a brownfield/strangler migration strategy (prioritized by value/risk).

• Build the React Native core: navigation, state, networking, local storage, logging, and error handling.

• Integrate authN/authZ (e.g., Cognito/OIDC) and connectivity to AWS APIs (API Gateway/Lambda/ECS).

• Deliver key operational screens: equipment monitoring, OEE (Availability/Performance/Quality), KPIs, alerts/events, and offline sync.

• Define mobile CI/CD (build, test, signing, distribution) and quality practices (linters, tests, crash reporting).

Key responsibilities

• Design and implement the migration from Android Kotlin React Native with minimal user impact and operational continuity.

• Build reusable components, modular architecture (e.g., Clean Architecture/MVVM adapted to RN), and performance best practices.

• Consume IoT/KPI data via APIs and/or streams (when applicable), focusing on resilience, latency and efficient usage.

• Implement offline-first capabilities (cache, sync queues, retries) for plants with intermittent connectivity.

• Ensure mobile security standards (secure storage, token handling, basic hardening, OWASP MASVS).

• Define/execute testing (unit, integration, E2E) and work with QA/Product on acceptance criteria.

• Collaborate with Backend/Cloud teams on API contracts, observability (logs/metrics/traces) and error handling.

• Document design decisions, contribution guidelines and technical handover; participate in code reviews and continuous improvement.

Must-have requirements

• 3+ years in mobile development with proven native Android (Kotlin) experience.

• Hands-on experience with brownfield apps and/or modernization/migrations.

• Solid React Native knowledge (JS/TS), hooks, navigation, state management (Redux/Zustand/MobX or similar).

• REST/GraphQL API integration and auth (JWT/OAuth2/OIDC).

• Experience with AWS or cloud environments (ideally API Gateway, Lambda, Cognito, IoT Core, S3, CloudWatch).

• Local storage (SQLite/Realm/AsyncStorage) and synchronization strategies.

• Mobile CI/CD (Fastlane/GitHub Actions/Bitrise/CircleCI) plus signing and release processes.

• Testing & quality practices (Jest, RN Testing Library, Detox/Appium—at least one).

• Technical English for documentation/specs.

Nice-to-have

• Industrial IoT experience and integration with sensors/SCADA/MES.

• Knowledge of OEE and manufacturing KPIs (downtime, scrap, speed, production).

• WebSockets/MQTT (especially with AWS IoT Core).

• Mobile observability (Crashlytics/Sentry), feature flags, A/B testing.

• Clean architecture, monorepos, native modules/bridges, performance optimization.

• Industrial security/compliance (ISO 27001, IEC 62443).