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

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers.

She will pick the best candidates from Jack's network.

The next step is to speak to Jack.

Job Title

Mobile Software Engineer

Salary

£40k-£45k + Equity

Company Description

Founder-led climate tech startup and the UK's largest reusable packaging provider for the food service industry

Job Description

Join a mission-driven team replacing single-use packaging with IoT and AI technology. You will lead mobile engineering efforts, owning the migration to Kotlin Multiplatform while shipping features that have already prevented 1.6 million pieces of waste. This is a high-impact role working directly with the technical lead to build sustainable infrastructure.

Location

London, UK

Why this role is remarkable

Work at the forefront of sustainability with a Forbes 30 Under 30 founder on a product that has already scaled to 50+ sites and major enterprise clients like BT and the NHS.

Gain true ownership of the mobile roadmap, including a complete migration to a unified Kotlin Multiplatform codebase and integration with Apple/Google Wallets.

Receive meaningful early-stage equity in a fast-growing startup where your engineering decisions directly reduce environmental waste at a massive scale.

What You Will Do

Lead the development and maintenance of consumer and client-facing applications, specifically driving the transition from native apps to a unified KMP architecture.

Build and integrate lightweight web applications with digital wallets to streamline container tracking and improve the user experience for reuse.

Collaborate across the stack by contributing to PHP/Laravel backend services and occasionally supporting Python-based software on Linux smart bin hardware.

The ideal candidate

1-2 years of professional mobile experience with production-level Kotlin skills and a strong foundation in native Android development.

Practical experience or deep technical enthusiasm for Kotlin Multiplatform (KMP), with the ability to manage iOS frameworks and SwiftUI integrations.

A versatile, startup-ready mindset comfortable exploring REST APIs, PHP, or Python to solve problems across the entire product ecosystem.

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.

How does this work?

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.

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.