Mobile Software Engineer (£40k–£45k + Equity) at Cauli

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Job Title

Mobile Software Engineer

Salary

£40,000–£45,000 + Equity

Company Description

Cauli is the UK's largest reusable packaging provider, led by Forbes 30 Under 30 CEO Josephine Liang. They utilize IoT and AI-driven technology to replace single-use waste at scale, already preventing over 1.6 million pieces of packaging waste for major clients like BT, the NHS, and the University of Surrey.

Job Description

Join a mission-driven climate tech startup as the lead for mobile engineering. You will own the transition to a unified Kotlin Multiplatform codebase, shipping features across consumer and client-facing apps. This hands-on role offers real ownership, direct collaboration with the Head of Tech, and the chance to build infrastructure that eliminates environmental waste.

Location

London, UK

Why this role is remarkable

• Lead the migration of native iOS and Android apps into a unified Kotlin Multiplatform (KMP) codebase with high levels of autonomy and ownership.
• Join a fast-growing, founder-led team that has already scaled to 50+ sites and works with prestigious enterprise clients like BT and NHS Barts Trust.
• Receive meaningful equity options as an early team member, ensuring you share in the financial success of a company solving a critical environmental crisis.

• Develop and maintain mobile applications using Kotlin, including a point-of-sale client app and consumer-facing tools used in the real world.
• Architect and execute the migration to a unified KMP codebase while integrating lightweight web apps with Apple and Google Wallets for container tracking.
• Support the broader tech ecosystem by contributing to PHP/Laravel backends and occasionally working with Python on Linux-based smart bin hardware.

• Has 1–2 years of professional mobile engineering experience with production-level Kotlin skills and solid native Android development expertise.
• Possesses a strong interest or experience in Kotlin Multiplatform (KMP) and is comfortable working across both Android and iOS targets.
• Demonstrates a versatile startup mindset, willing to touch backend code and hardware integrations while maintaining clean, production-quality code.

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How does this work?

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