At a Glance
- Tasks: Lead mobile engineering and transition to a unified Kotlin Multiplatform codebase.
- Company: Join Cauli, the UK's largest reusable packaging provider, led by an inspiring CEO.
- Benefits: Competitive salary, equity options, and the chance to make a real environmental impact.
- Other info: Dynamic startup environment with opportunities for growth and collaboration.
- Why this job: Be part of a mission-driven team tackling climate change with innovative tech solutions.
- Qualifications: 1-2 years of mobile engineering experience and strong Kotlin skills.
The predicted salary is between 40000 - 45000 £ per year.
Cauli is the UK's largest reusable packaging provider, led by Forbes 30 Under 30 CEO Josephine Liang. They utilize IoT and AI-driven technology to replace single-use waste at scale, already preventing over 1.6 million pieces of packaging waste for major clients like BT, the NHS, and the University of Surrey.
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.
Location: London, UK
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.
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.
The ideal candidate:
- 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.
Mobile Software Engineer (£40k–£45k + Equity) at Cauli in London employer: Jack & Jill
Cauli is an exceptional employer, offering a unique opportunity to work at the forefront of climate technology in London. With a strong focus on employee growth and meaningful equity options, team members enjoy a collaborative and innovative work culture that empowers them to make a tangible impact on reducing environmental waste. Join a passionate, founder-led team dedicated to sustainability while developing cutting-edge mobile applications that drive real change.
StudySmarter Expert Advice🤫
We think this is how you could land Mobile Software Engineer (£40k–£45k + Equity) at Cauli in London
✨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 Jack & Jill 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 Jack & Jill.
✨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 Jack & Jill.
✨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 Jack & Jill 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 (£40k–£45k + Equity) at Cauli in London
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 Jack & Jill.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Jack & Jill 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 Jack & Jill
✨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 Jack & Jill 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.
