Senior Software Engineer @ Marshmallow

• 6+ years of software engineering experience.
• Expertise in Java and Spring, and eagerness to learn more.
• Experience with developing and scaling complex microservices systems.
• Previous experience with identifying, analysing, and resolving system availability, reliability, and performance issues.
• Experience mentoring and guiding more junior members of the team.
• Full-stack experience with React is an advantage.

• Backend : Latest Java μService, Spring Boot with Spring Cloud, DynamoDB, Terraform, Docker, AWS Fargate, Datadog, Opslevel, and TeamCity.
• Frontend : TypeScript, CSS-in-JS (Styled Components), React, Redux, Redux Hooks, and other modern state management libraries. Kotlin on Android and Swift on iOS.
• Data : SQL, Python, Snowflake (warehousing), dbt (modelling), Airflow (orchestration) & Looker (BI/visualisation).
• AI : Sierra.ai for conversational AI, Sagemaker and Tecton for machine learning, Python and LangChain for agentic AI solutions, and Cursor, Claude Code, and Junie for developer productivity.

We’re on a mission to make migration easy.

We started building Marshmallow in 2017. Since then, we’ve grown from 3 to 700+ people, gained unicorn status, raised ~£140M over three funding rounds, turned profitable, insured millions of drivers, and lent millions in car loans.

But we’re only just getting started. Our goal is to become one of the largest financial services providers in the world. Over the next 10 years, we’ll grow exponentially, not only by scaling our existing products, but also by building new ones.

To achieve our goals, we need incredibly ambitious, commercially driven people who never settle for ‘good enough’. Marshmallowers are hungry for autonomy and ownership, and would rather improve than coast. Everyone raises standards and has an impact, with a focus on collective success over self-interest.

We’ve created an environment where curious, tenacious people win and grow together. If that sounds motivating, this could be the place for you.

Engineering at Marshmallow

Marshmallow is looking for engineers to tackle complex challenges. So we can make migration easy for hundreds of millions of relocators around the world. Across frontend, backend, and full stack, working alongside designers, data scientists, and product managers; you’ll be at the heart of every solution we offer.

Builders of dynamic new products. Pioneers of new tools and technologies. Open collaborators. Clear communicators. Engineers take ownership of projects from end-to-end to turn goals and vision into reality. With a clear view of where the business is headed and resources readily available to make sure we get there.

You’ll have real-world impact creating trailblazing products, true visibility across the business, and the support to share your ideas, ask for what you need, and progress.

Learn fast and move forward with an engineering career at Marshmallow.

About our Claims Team you’ll be joining

Claims Tech is a distributed team across London and Budapest, with the purpose to revolutionise the claims journey. Our mission is to streamline the claims process, reducing costs, enhancing the customer experience, and empowering our operational team to reach their full potential. Three engineering teams specialize in the First party, Third party and Fraud verticals.

Currently, we are in the process of developing our cutting-edge internal Claims Management System (CMS). This application is designed to seamlessly guide insurance claims from inception to resolution. It handles every facet of the claims process (internal, external, customer-facing), integrating with partners as well as the financial reporting.

Our commitment to innovation and excellence is at the core of everything we do, and the Claims Management System is a testament to our dedication to achieving industry-leading results in claims management.

Perks of the job

• Flexi-office working – Spend at least 3 days a week with your team in our Budapest office. The rest is up to you! Plus, you have 4 weeks of Work From Anywhere to use, with no need to come to the office.
• Competitive bonus scheme - designed to reward and recognise high performance.
• 4-week fully paid sabbatical after being with us for 4 years.
• Learning and development – Personal budgets for books and training courses to help you grow in your role. Plus 2 days a year - on us! - to further your skillset.
• Mental wellbeing support – Access therapy and mental health sessions through Oliva.
• SZÉP card - Budget to spend on meals, leisure, and accommodation.
• Medicover Blue Package - An exclusive pass to top-notch healthcare services.
• Company-wide Marshmallow Engineering Hackathon twice a year.