Role Overview

We're seeking a Senior Fullstack Engineer whose gravitational centre is mobile-native and cross-platform development — but who builds the backend services, APIs, and web counterparts that complete the picture. You will put enterprise intelligence in people's hands: field workers capturing data in areas with intermittent connectivity, executives reviewing reports between meetings, and operations teams receiving real-time alerts on the move. You will work across our APEX Suite — a unified enterprise intelligence platform serving agriculture, mining, retail, banking, and international cooperatives.

At Reisiger, every engineer operates with extreme ownership: you own the experience from the moment a user unlocks their phone to the moment data lands in the backend — and every layer in between. We are architecture-agnostic — React Native, Flutter, native Swift/Kotlin, or a PWA, depending on what the use case actually needs. And we are AI-native — Claude Code is embedded in our daily workflow, scaffolding platform-specific components, orchestrating cross-platform test matrices, and accelerating delivery.

Key Responsibilities

• Architect and build mobile applications (iOS and Android) that serve as primary delivery channels for enterprise intelligence across Southern Africa

• Make informed cross-platform decisions — React Native, Flutter, native, or PWA — choosing the right approach for each use case and defending that choice with trade-off analysis

• Design and implement offline-first architectures with intelligent sync — our users operate in environments where connectivity is intermittent, not guaranteed

• Build push notification infrastructure and real-time messaging systems across multiple channels (WhatsApp Cloud API, Telegram, SMS, native push)

• Develop mobile experiences for field data capture, alert delivery, signal monitoring, report viewing, and branded output

• Build fullstack features end-to-end — API design, backend services, database layer — for the services your mobile clients consume

• Integrate platform-native capabilities — camera, GPS, biometrics, local storage, background processing — when they add genuine value to the user experience

• Own mobile performance across the device spectrum — from flagship iPhones to budget Android devices common in field operations

• Leverage Claude Code to scaffold mobile components, generate platform-specific adaptations, orchestrate device testing, and automate release workflows

Required Skills & Qualifications

• 5+ years of software engineering experience with at least 3 years focused on mobile application development

• Deep experience with at least one cross-platform framework (React Native or Flutter) and at least one native platform (Swift/iOS or Kotlin/Android)

• Strong understanding of mobile architecture patterns — offline-first data, background sync, optimistic UI, push notification lifecycle management

• Experience with real-time communication — WebSockets, Server-Sent Events, or push notification services (FCM, APNs)

• Backend proficiency — Node.js, Python, or .NET — sufficient to build, deploy, and maintain the services your apps consume

• REST and GraphQL API design from the mobile consumer's perspective — you know what makes a good mobile API versus a web API

• Experience with mobile CI/CD — app store deployment, over-the-air updates (CodePush, Expo EAS), automated testing pipelines

• Understanding of mobile performance constraints — battery impact, bandwidth efficiency, memory management, startup time optimisation

• Active daily use of AI-assisted development tools — prompt engineering, code generation, agent orchestration

• Empathy for diverse device contexts — you design for the R2,000 Android phone on a farm, not just the latest flagship in a city office

Preferred Qualifications

• Experience with WhatsApp Business API, Telegram Bot API, or other messaging platform integrations for enterprise notification delivery

• Knowledge of geospatial features in mobile — GPS tracking, geofencing, map integration (Mapbox, Google Maps SDK)

• Experience building apps that handle multi-language content and RTL layouts

• Familiarity with mobile security — certificate pinning, biometric authentication, secure local storage, app attestation

• Experience with Bluetooth/IoT device communication for field sensor integration

• Understanding of mobile analytics and crash reporting (Firebase Crashlytics, Sentry Mobile)

• Background in agricultural, mining, or field-operations mobile tooling — understanding constrained-environment UX

• Experience with app store optimisation and staged rollout strategies

• Knowledge of progressive web app capabilities and service worker patterns as a cross-platform alternative

Visit our website at reisiger.co.za