Mobile Software Engineer (ClimateTech)

You'll be the driving force behind our mobile engineering, shipping new features and updates across our consumer and client-facing apps.

Day to day, this means:

• Developing and maintaining our mobile applications, including our point-of-sale client app (Kotlin)
• Completing the migration of our separate iOS and Android apps into a unified KMP codebase - you'll have real ownership of this from day one
• Building a lightweight web app integrated with Apple and Google Wallets as part of our container tracking solution
• Contributing to backend work in PHP/Laravel when needed - you won't be expected to be a backend specialist, but you should be comfortable exploring the codebase
• Occasionally supporting our smart bin hardware software (Linux SBCs running Python) when the need arises

This is a broad, hands-on role - ideal if you like variety and want to see your work in the real world quickly.

We're looking for someone with roughly 1-2 years of professional mobile engineering experience. We care far more about what you've shipped and how you work than years on a CV.

You might be a strong Android engineer ready to own a multiplatform codebase, or someone who's already hands-on with KMP and wants more ownership. Either way, you're someone who takes pride in clean, production-quality code - and wants the work to mean something.

You'll need:

• Production-level Kotlin skills
• Solid native Android development experience
• Working knowledge of (or genuine enthusiasm for) Kotlin Multiplatform - you should be comfortable picking up an in-progress migration and running with it
• Comfort working across Android and iOS targets - deep Swift/UIKit expertise isn't required, but you'll need to work with KMP-generated iOS frameworks and handle basic Xcode/SwiftUI integration
• REST API integration experience

These would make you stand out:

• PHP/Laravel familiarity - even read-and-modify level
• Any web development experience (HTML/CSS/JS or lightweight frameworks)
• Exposure to Apple Wallet / Google Wallet integrations or QR-based flows
• Python familiarity, for occasional crossover with our smart bin codebase
• CI/CD experience (e.g. GitHub Actions)
• Experience with payment SDKs or Stripe
• A background in hospitality, food service, sustainability, or IoT - not required, but a genuine plus

Note on KMP: it's still a specialist skill. If you're a strong Kotlin/Android engineer who's actively working towards KMP and can show real enthusiasm for it, we want to hear from you.

• Equity Options: Competitive options as part of the salary package.
• Time Off: 30 days annual leave (including bank holidays) + your birthday off + Christmas shutdown (around 35 days total).
• Culture: A small, diverse, supportive team - regular socials, a founders-led environment, and work that matters.
• Perks: Company pension (NEST), Techscheme, and Cyclescheme.

At Cauli, we're tackling one of the UK's most stubborn environmental problems: the 10.7 billion items of packaging waste generated every year - less than 9% of which is actually recycled. We're not tweaking the system. We're replacing it. Applying IoT and AI-driven technology in reuse, we've already prevented over a million pieces of single-use waste. Now we're scaling - and we need a mobile engineer who wants to help build the infrastructure that makes reuse as easy as throwaway. Why Join Cauli? We're a small, ambitious team led by founders who are deeply in the weeds with you. You'll work directly with our Head of Technology, with real ownership over meaningful parts of our product - not tickets in a backlog. We also know that asking you to take a mission-driven role means we need to reward you for the growth we're building together. That's why equity is a genuine part of your package here - not a footnote., At Cauli, we're tackling one of the UK's most stubborn environmental problems: the 10.7 billion items of packaging waste generated every year - less than 9% of which is actually recycled. We're not tweaking the system. We're replacing it.