Mobile Software Engineer (£40,000–£45,000 + Equity) at Cauli

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Job Title: Mobile Software Engineer (£40,000–£45,000 + Equity) at Cauli - UK's largest reusable packaging provider

Salary: £40,000–£45,000 + Equity

Company Description: Cauli - UK's largest reusable packaging provider for the food service industry

Job Description:
As our first dedicated mobile hire, you will eliminate single-use waste by building the infrastructure for reuse. You'll own the migration to Kotlin Multiplatform, ship features across consumer and client-facing apps, and work directly with our technical lead. This is a hands-on role where your code directly impacts plastic pollution reduction.

Location: London, UK

Why this role is remarkable:

• You will have direct ownership of a high-stakes migration to Kotlin Multiplatform (KMP), shaping the future architecture of our mobile ecosystem from day one.

• Join a mission-driven team that has already prevented 1.6 million pieces of waste, working with prestigious clients like the NHS, BT, and major universities.

• Receive meaningful early-employee equity in a fast-growing startup led by a Forbes 30 Under 30 founder, ensuring you share in the company's long-term success.

What you will do:

• Lead the migration of separate iOS and Android applications into a unified Kotlin Multiplatform codebase to streamline cross-platform feature delivery.

• Develop and maintain our point-of-sale client application using Kotlin and integrate lightweight web apps with Apple and Google Wallets.

• Collaborate across the stack by contributing to PHP/Laravel backend services and supporting IoT hardware running Python on Linux SBCs.

The ideal candidate:

• Professional experience (1-2 years) in mobile engineering with production-level Kotlin skills and a solid foundation in native Android development.

• Demonstrated enthusiasm for or experience with Kotlin Multiplatform, including the ability to handle KMP-generated iOS frameworks and basic SwiftUI integration.

• Versatile, startup-ready mindset with the ability to navigate REST API integrations and a willingness to touch backend or hardware code when necessary.

Who are Jack & Jill?
Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.

Next steps
Step 1. Visit our website.
Step 2. Click 'Talk to Jack'.
Step 3. Talk to Jack so he can understand your experience and ambitions.
Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.
Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.
Step 6. If not, Jack will find you excellent alternatives. All for free.

We never post fake jobs
This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.
Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.
We appreciate this can make them look a bit suspect, but there isn't much we can do about it.
Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.