Mobile Software Engineer – Kotlin Multiplatform, London

About the role

Join a fast‑growing climate‑tech startup as the lead mobile engineer. You will own the migration of native iOS and Android apps to a unified Kotlin Multiplatform codebase while delivering new consumer‑ and client‑facing features.

Key responsibilities

• Develop and maintain mobile applications in Kotlin, including a point‑of‑sale client app and consumer tools.
• Architect and execute the transition to a single Kotlin Multiplatform (KMP) codebase.
• Integrate lightweight web apps with Apple and Google Wallets for container tracking.
• Collaborate directly with the Head of Tech and contribute to backend services (PHP/Laravel) and Python‑based smart‑bin hardware.

Required profile

• 1–2 years of professional mobile engineering experience.
• Strong production‑level Kotlin skills and solid native Android development expertise.
• Interest or experience in Kotlin Multiplatform and ability to work on both Android and iOS targets.
• Startup mindset – comfortable touching backend code and hardware integrations while maintaining clean, production‑quality code.

Required skills

• Kotlin
• Kotlin Multiplatform
• Android development
• iOS development
• PHP
• Laravel
• Python
• Linux

What we offer

• Competitive salary £40k–£45k plus equity options.
• High autonomy and ownership of a critical product migration.
• Opportunity to work on climate‑impact solutions for major enterprise clients.
• Collaborative, founder‑led team with rapid growth and scaling across 50+ sites.