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Senior Android Engineer
Senior Android Engineer – New Financial Products Team
We’re on a mission to make migration easy—and to build one of the world’s largest financial services providers.
About Marshmallow
Marshmallow started in 2017, growing from 3 team members to 700+ and becoming a unicorn business through £140M+ in sequential funding rounds. We’ve reached profitability, insured millions of drivers, and revolutionised car finance—and now we’re expanding into a new era:
By 2026, we will transform into a high-engagement financial companion for migrants in the UK, unlocking multi-product growth, deeper customer understanding, and new revenue streams. This role sits at the heart of that mission.
We thrive on ambition, autonomy, and collective success over self-interest. Our environment rewards curiosity, tenacity, and a proactive mindset: if your ideas improve things, we’ll act on them. Team members balance ownership with continuous growth.
Maret’s hybrid work model allows you to spend 3 days per week in our London office.
Engineering at Marshmallow
We’re building the future of financial migration. Our engineers own their work from concept to delivery, spanning:
- Full stack (including iOS, Android)
- Frontend (Jetpack Compose would introduce you to a new world of performance and simplicity!)
- Backend experience (optional but encouraged to grow)
- Data and product intelligence
Our cross-functional product teams, from renewals to claims, define their own roadmaps, push innovation, and collaborate daily with designers, researchers, and engineers.
Team Fit: Senior Android Engineer
You’re joining a fast-moving team pioneering Marshmallow’s next phase: a new generation of financial products. Your imput will define, build, and influence—such as:
Core Responsibilities
- Define what to build. Move fast in unfamiliar territory, balancing adaptability and long-term impact. Pivot when priorities shift, without being asked.
- Own critical parts of our Android codebase end-to-end: becoming our trusted go-to expert for core systems while raising technical standards in the team.
- Shape engineering decisions. Collaborate with leadership to shape the technical roadmap that underpins 2026’s ambition.
- Ship high-impact Android solutions using Jetpack Compose, MVVM/MVI architectures, Kotlin Coroutines, while leveraging AI tools to accelerate work.
- Lead projects with clear timelines that align with business goals. Turn vague challenges into deliverable milestones others trust—and depend on.
- Proactively improve the team’s tooling and processes. Use data to eliminate ambiguity, making work faster, better, and more scalable.
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Required Experiences & Mindset
- Sound commercial expertise. You demonstrate the ability to make bold trade-offs—risks only happen because you’re smart enough to mitigate them.
- Your problems don’t sit on you. You identify issues early before they derail projects, solve them fast, and bring others with you.
- Embrace change as a driver. You actively research new practices, integrating them to raise pace and quality.
- Consider introducing AI-assisted development frameworks (Claude Code is on your stack!).
- Relationships with purpose. You collaborate across product, design, backend with a shared’sense of ownership’—not just responsibility—that ships value.
- Technical + impact alignment. Ask the right questions during product conversations, using your perspective to challenge assumptions—and clarify opportunities.
Technical Requirements
Our tech stack speaks to your skills:
- Language & Architecture: Kotlin (deep understanding required) + Jetpack Compose + dynamic results (is this already your daily頃?)
- Concurrency & Testing:
- Experience with Kotlin Coroutines to write idiomatic, non-blocking logic.
- Web of unit tests (business logic), snapshots for the UI, and automated UI tests.
- Tooling: Bitrise for CI/CD, with push driven deployment pipelines that mitigate risk.
- Glue: Modern CI/CD, local Gradle feature modules, and collaborative GitHub workflows; this isn’t just checklists—involve detectives to enforce lint & detekt.
Demonstrate a track record of shipping high expectations to App Store and Google Play.
Bonus marks if you have:
- We ship Android with across-function market reach in mind—Rules of Thirds would be useful (except you’re building the new ones!)
- You’ve worked on large-scale financial apps with strict regulatory constraints (Car Financing or FCA-compliant products)
- Mentoring others is downright joyful for you.
Get help with your application
Your very own career expert that helps elevate your application to the next level.
Our Gauranteed Growth Commitment
We’re kept normalising that back-end knowledge is useless without knowing how to build edge cases calm so quickly! To level up your career:
- Weekly local mentorship sessions from engineers in the CTO’s wing—empowered to guide you on technology strategy.
- Earmarking funding for certifications & education (your learning budget exceeds £1000/year for skills acquisition).
Your room will expand—and so will yours.
What’s Included?
Career Growth Library Money
- Bonus scheme (results-based high-potential performance allows sharing a chunk of 25–100% of their salary).
- Private medical insurance via Vitality, + mental health & wellbeing support with Oliva (tailored ways to help your home-right world).
- £1,800 spending budget to develop yourself (take your pick: Coursera, Harlem MBA).
- 2 learning days per year (standbacks, workshops, build-rank access to top-tier opportunities).
- Monthly flexible benefits (pump food in, car tokens, pet coverage—great health, perks that match you).
- 25 hours of holiday, extended for leaders.
- Work From Anywhere. Need another week on the or worse off? Our policy gives you 4 per year with support for disaster plans.
Hiring Process
We evaluate you on how you clear challenges we face:
- Speak with our Talent Team (30 mins—introductions only).
- Past Experience deep-dive: 45 minutes with our hiring manager & Director of our team (we include you in conversations).
- Technical Case Study: Collaborative session with build team on a real-life-like scenario.
- Culture Panel: Meet other engineers, Product Managers and discuss critical-thinking (60 mins).
Notes:
- If we don’t join you to our group of finalists → you hear nothing during the process.
- No individualized feedback given—but reflects a small team managing impact from bottom-up.
Diversity of Thought
For better results, our composition knows different perspectives improve outcomes. We commit fairly—difference isn’t a distractor here—it’s the vision. Assignments may suggest reframing diversity (if more could ask).
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