Mobile Software Engineer – £40k–£45k + Equity

About the role

Join a mission‑driven climate‑tech startup as the lead mobile engineer, responsible for transitioning native iOS and Android apps to a unified Kotlin Multiplatform codebase. You will work hands‑on, own feature delivery across consumer‑facing and client‑facing applications, and collaborate directly with the Head of Tech to build infrastructure that reduces environmental waste.

Key responsibilities

• Develop and maintain mobile applications using Kotlin, including a point‑of‑sale client app and consumer‑facing tools.
• Architect and execute the migration to a unified Kotlin Multiplatform (KMP) codebase, integrating lightweight web apps with Apple and Google Wallets for container tracking.
• Contribute to the broader tech ecosystem by supporting PHP/Laravel back‑ends and occasionally working with Python on Linux‑based smart‑bin hardware.
• Collaborate with cross‑functional teams and the Head of Tech to deliver high‑quality features on schedule.
• Ensure production‑grade code quality, clean architecture, and reliable performance across platforms.

Required profile

• 1–2 years of professional mobile engineering experience with production‑level Kotlin skills and solid native Android development expertise.
• Strong interest or experience in Kotlin Multiplatform (KMP) and comfort working on both Android and iOS targets.
• Versatile 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
• Apple Wallet integration
• Google Wallet integration

What we offer

• Lead the migration of native apps into a unified KMP codebase with high autonomy.
• Join a fast‑growing founder‑led team serving enterprise clients such as BT and NHS Barts Trust.
• Competitive salary (£40k–£45k) plus meaningful equity options as an early team member.
• Opportunity to make a tangible impact on environmental waste reduction through innovative technology.