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.
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Mobile Software Engineer at Cauli
Join Cauli as a Mobile Software Engineer and help eliminate 10.7 billion items of annual packaging waste. Working directly with the founders of this high-impact climate tech startup, you’ll own the migration to a Kotlin Multiplatform codebase and build IoT-integrated apps for clients like BT and the NHS. With a competitive salary, meaningful equity, and a 35-day holiday package, this is a rare chance to use your mobile skills for genuine environmental change in a fast-scaling London startup.
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Location
London, United Kingdom
Compensation
£40k-£45k + Equity
Company
Cauli
Role overview
Climate Technology / Manufacturing
CauliBox is a climate tech company that provides digitally-enabled reusable food and drink packaging solutions within the circular economy. The company offers a tech-enabled system that allows food businesses to manage reusable packaging through a supply chain integrated with technology, enabling the tracking, returning, and washing of packaging to address single-use waste. CauliBox serves the foodservice industry, assisting businesses in implementing reusable packaging systems and rewarding customers and food businesses for sustainable behaviours. The company is the largest provider of reusable packaging solutions for the food service industry in the UK.
What you will do
- 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.
Who this is a fit for
- 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.
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.
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.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
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 your profile’s a match and Cauli wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.