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.
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London, UK£40K–£45K + Equity
Featured roleLondon, UK£40K–£45K + Equity
Mobile Software Engineer at Cauli — UK's largest reusable packaging provider
Most engineers spend their careers building things that won't matter in ten years—this isn't one of those roles. Join Cauli, the UK's leader in reusable packaging, and help us replace 10.7 billion items of annual waste with intelligent IoT and AI-driven technology. As an early mobile engineer, you'll own our Kotlin Multiplatform migration and build the infrastructure that makes reuse as easy as throwaway. With meaningful equity, a mission that matters, and a direct line to the founders, this is your chance to turn your code into real-world environmental impact.
Overview
Why this role stands out
Company
Climate Technology / Manufacturing
Cauli - UK's largest reusable packaging provider for the food service industry
Responsibilities
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.
Candidate profile
Who this is a fit for
- 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.
What makes it remarkable
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.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.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.
I recruit from Jack’s network and make the intro when I spot a great match.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.
About Jack & Jill
Meet Jack
Jack gets to know what you are great at, what you want next, and makes sure Jill considers you for the right opportunities.
How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
Jack