Mobile Software Engineer – Kotlin Multiplatform, London

About the role

Join a mission‑driven climate tech startup that is replacing single‑use packaging with IoT and AI solutions. As a Mobile Software Engineer you will lead the migration to Kotlin Multiplatform while delivering new features that have already prevented 1.6 million pieces of waste.

Key responsibilities

• Lead development and maintenance of consumer‑ and client‑facing mobile applications.
• Drive the transition from native Android/iOS apps to a unified Kotlin Multiplatform (KMP) codebase.
• Build lightweight web components that integrate with Apple and Google Wallets for container tracking.
• Collaborate with backend teams on PHP/Laravel services and support Python‑based software for smart‑bin hardware.

Required profile

• 1‑2 years of professional mobile development experience with production‑level Kotlin.
• Strong foundation in native Android development and enthusiasm for Kotlin Multiplatform.
• Ability to work across the stack, exploring REST APIs, PHP, or Python as needed.
• Startup‑ready mindset comfortable with fast‑paced, cross‑functional collaboration.

Required skills

• Kotlin
• Kotlin Multiplatform (KMP)
• Android development
• iOS frameworks & SwiftUI
• REST APIs
• PHP & Laravel
• Python
• Linux environments

What we offer

• Opportunity to shape the mobile roadmap and own a full migration to KMP.
• Early‑stage equity in a fast‑growing startup.
• Work alongside a Forbes 30 Under 30 founder and major enterprise clients such as BT and the NHS.
• Impactful work that directly reduces environmental waste at scale.