Mobile Software Engineer – Kotlin Multiplatform

About the role

Join Cauli, the UK’s largest reusable packaging provider, as the lead mobile engineer. You will own the migration of native iOS and Android apps into a unified Kotlin Multiplatform codebase while delivering real‑world consumer and client‑facing features.

Key responsibilities

• Develop and maintain mobile applications using Kotlin, including a point‑of‑sale client app and consumer tools.
• Architect and execute the migration to a unified Kotlin Multiplatform (KMP) codebase.
• Integrate lightweight web apps with Apple Wallet and Google Wallet for container tracking.
• Support the broader tech ecosystem by contributing to PHP/Laravel back‑ends and occasional Python work on Linux‑based smart‑bin hardware.

Required profile

• 1–2 years of professional mobile engineering experience with production‑level Kotlin skills.
• Strong native Android development expertise.
• Interest or experience in Kotlin Multiplatform and comfort targeting both Android and iOS.
• Startup mindset willing to touch backend code and hardware integrations while maintaining clean, production‑quality code.

Required skills

• Kotlin
• Android development
• iOS development
• Kotlin Multiplatform (KMP)
• PHP
• Laravel
• Python (basic)
• Apple Wallet integration
• Google Wallet integration

What we offer

• High autonomy leading the migration to a unified KMP codebase.
• Early‑stage equity options as part of a fast‑growing, founder‑led team.
• Opportunity to work with prestigious enterprise clients such as BT and NHS Barts Trust.
• Mission‑driven climate‑tech environment focused on eliminating packaging waste.