At a Glance
- Tasks: Develop and maintain mobile applications, driving innovation in climate tech.
- Company: Join Cauli, a mission-driven startup tackling packaging waste with cutting-edge technology.
- Benefits: Competitive salary, equity options, 30 days leave, and a supportive team culture.
- Other info: Hybrid role with opportunities for client interaction and hands-on project involvement.
- Why this job: Make a real impact on sustainability while growing your career in a dynamic environment.
- Qualifications: 1-2 years of mobile engineering experience, strong Kotlin skills, and a passion for innovation.
The predicted salary is between 40000 - 45000 £ per year.
London (Zone 1) / Hybrid | £40,000 - £45,000 + Equity
Most engineers spend their careers building things that won't matter in ten years. This isn't one of those roles.
The Mission: Disrupt. Reuse. Scale.
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
Io T 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.
Our equity options are meaningful.
As an early team member, you'll receive options that reflect the ground-floor stage we're at. We're growing fast — and when Cauli wins, you win with us.
The Role
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 i OS 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.
Who You Are
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'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 i OS targets — deep Swift/UIKit expertise isn't required, but you'll need to work with KMP-generated i OS frameworks and handle basic Xcode/Swift UI 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. Git Hub Actions)
- Experience with payment SDKs or Stripe
- A background in hospitality, food service, sustainability, or Io T — 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.
The Rewards
We expect high performance, and we reward it well.
- 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.
- A Few Practicalities
- Visa Status: You must currently have the right to work in the UK. Cauli Ltd is unable to offer visa sponsorship for this position.
- Location: This role can be hybrid, but requires time in our London (Zone 1) office and frequent client visits/field days.
- #J-18808-Ljbffr
Mobile Software Engineer (ClimateTech) employer: CauliBox
At Cauli, we are not just another tech company; we are a mission-driven team dedicated to tackling the pressing issue of packaging waste in the UK. Working in our London (Zone 1) office offers you the chance to be part of a small, ambitious group where your contributions directly impact our innovative solutions. With competitive equity options, generous time off, and a supportive work culture, we ensure that as we grow, you grow with us, making your work both meaningful and rewarding.
StudySmarter Expert Advice🤫
We think this is how you could land Mobile Software Engineer (ClimateTech)
✨Join Local Tech Meetups
Get out there and mingle with fellow developers by joining local tech meetups. It’s a fantastic way to meet people who might be working at CauliBox or know someone who does. Plus, you can pick up some trendy tech skills and trends while you're at it!
✨Contribute to Open Source Projects
Show off your coding chops by jumping into open-source projects. Not only does this give you practical experience, but it also gets you noticed in the dev community. You'll create a killer portfolio that speaks volumes about your skills to CauliBox.
✨Tap into Online Developer Communities
Don’t underestimate the power of online developer communities like GitHub, Stack Overflow, and even Reddit. Participate in discussions, share your projects, and build your visibility. We can often find opportunities through these channels that can lead to a full-time gig at companies like CauliBox.
✨Explore Job Boards Specifically for Tech Roles
Keep your eyes peeled on job boards that focus on tech roles. Sites like TechCareers or Stack Overflow Jobs can often have listings for companies like CauliBox that might not show up on broader job sites. Make it a habit to check these regularly, and don’t hesitate to apply directly through our website!
We think you need these skills to ace Mobile Software Engineer (ClimateTech)
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at CauliBox.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at CauliBox and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at CauliBox
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If CauliBox uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
