marshmallow
Senior Android Engineer
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Senior Android Engineer – New Financial Products Team
About Marshmallow
We’re on a mission to make migration easy, growing into one of the largest financial services providers in the world.
Started in 2017, Marshmallow has:
- Scaled from 3 to 700+ people
- Achieved unicorn status
- Raised ~£140M across three funding rounds
- Turned profitable
- Insured millions of drivers and lent millions in car loans
Our vision is exponential growth over the next decade, scaling not just existing products, but building entirely new ones. We’re commercially driven, seeking ambitious professionals who refuse to settle for “good enough.” Marshallowers thrive on autonomy, ownership, and leaving standards higher than they found them, with a culture of collective success.
Engineering at Marshmallow
Engineers are crucial to our solutions, working end-to-end on product builds, tackling challenges to ensure fast scaling.
The team operates across:
- Frontend, Backend, Full Stack
- iOS & Android
- Collaborating with designers, data scientists, and product managers within specialised teams like Renewals, Telematics, and Claims.
ABOUT THE ROLE
We’re hiring a Senior Android Engineer to join the New Financial Products Team as we pioneer Marshmallow’s next era: For 2026, the focus is transforming Marshmallow into a high-engagement financial companion for migrants in the UK, driving multi-product growth, deeper customer understanding, and new revenue streams.
What You’ll Be Doing
- Lead a team breaking new ground for Marshmallow:
- Define priorities, adapt to shifting needs, and act before problems arise
- Own major Android codebase components—becoming the authority on core systems—while increasing the technical standard across the team
- Partner with leadership to shape the technical roadmap and critical architectural decisions for Marshmallow’s future
- Engineer with modern best practices in Jetpack Compose, MVVM/MVI, Kotlin Coroutines, and robust CI/CD — leveraging AI tools to streamline development
- Drive high-impact projects: Break down complex challenges, lead teams, and deliver with ownership
- Continuously improve engineering processes, tooling, and culture by using data to make measurable gains in quality and speed
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Who You Are
- Thrives under pressure, making smart trade-offs between speed and quality
- Proactive problem solver: Notices issues before they escalate, resolves them while mentoring the team
- Embraces flexibility and stays curious, adopting new tools to enhance efficiency
- Collaboratively-minded: Builds trusted relationships across product, design, backend, and front-end teams
- Infuses engineering expertise into product decisions, challenging and refining assumptions early
REQUIREMENTS
Skills Experiences & Qualities
- Strong commercial Android development experience, with deep specialized knowledge of Kotlin and hands-on mastery of Jetpack Compose and Kotlin Coroutines
- Certifiable talent in delivering high-quality apps to App Store/Google Play
- Proven ability to work cross-functionally with product, design, and engineering teams, ensuring outcomes align with business goals
- Commitment to writing maintainable and well-tested code, favoring clean architecture and safe development
- Early collaboration with designers and product managers to optimize workflows, technical feasibility, and usability
Our Tech Stack
- Kotlin for new features development
- Jetpack Compose for UI innovation
- Coroutines for asynchronous workflows
- Claude Code integration — AI-assisted development for boilerplate debugging, review efficiency
- Modular app structure: Gradle feature modules for ease-of-maintenance & scalability
- Testing philosophy: Unit tests for business logic, snapshot UI tests, and full automated UI regression via platforms and tools.
- CI/CD: Administered via Bitrise
- Code reviews: GitHub repository for collaborative code reviews
- Automated code quality checks and standardization via GitHub-based linting and Detekt
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Culture and Growth
Token recognition and environmental pledge: Professional growth encouraged through mentorship opportunities open to transition back-end engineering or full-stack skill development.
At Marshmallow, we celebrate diverse perspectives and prioritize inclusive hiring, irrespective of background, identity, or experience.
PERKS
- Bonus scheme: Aligned with performance metrics
- Private medical insurance with Vitality and mental health support via Oliva
- Personal learning budget and two dedicated L&D days per year
- Flexible benefits budget earmarked for monthly self-choices
- 25 holiday days, plus all bank holidays
- 4 ‘Work From Anywhere’ weeks per year
Our Selection Process
Initial call with a Talent Team member (30 mins) Past Experience Interview with the Hiring Manager & GM of New Financial Products (30–45 mins) Technical Assessment: Android-focused case study and interview with the team (120 mins) Culture Fit Discovery (60 mins)
Due to high application volume, we won’t provide individual feedback. We seek ideas from diverse backgrounds: submit your application if you see yourself in this role.*
Diversity at Marshmallow
“Diverse thinking produces the best ideas,” necessitating fair hiring without any bias. If you apply, you may belong—to explore the full potential of Marshmallow’s future.
“It took my CV and asked me questions relevant to understanding what kind of jobs to suggest for me. Suggestions were almost perfect. Jobs were exactly what I’ve been looking for.”
Jessica, London
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