Senior Backend Engineer, Marshmallow
AI Automation
+ Competitive bonus scheme
3 days a week in office
We’re building a huge technology company that helps make moving country easier.
Posted today
We’re building a huge technology company that helps make moving country easier.
501-1000 employees
Posted today
+ Competitive bonus scheme
3 days a week in office
501-1000 employees
Company mission
To back those who find themselves on a different path, either by choice or by circumstance, helping the exceptions to the rules that others aren’t interested in serving.
Role
Who you are
- 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, analyzing, and resolving system availability, reliability, and performance issues
- Experience mentoring and guiding more junior members of the team
- Familiarity with AI frameworks, prompt engineering, and workflow orchestration for building autonomous agents is a plus
- Experience with TypeScript and a declarative framework, such as React to model user interfaces or interactive workflows is a plus
What the job involves
- Our team specializes in seamlessly integrating agentic AIs into customer support workflows, ensuring high-quality interactions at scale while lowering operational costs
- By deploying autonomous agents that can handle a broad range of inquiries, we help reduce conversation overhead and allow human specialists to focus on more complex tasks
- Collaborating closely with customer service leaders, we ensure our solutions maintain the company’s voice and deliver exceptional experiences across all support channels
- Develop autonomous AI agents using modern frameworks and APIs to streamline insurance processes and automate customer operations
- Build a scalable backend platform to support rapid development, deployment, and management of AI solutions
- Create reusable, declarative workflow definitions for AI agents to guide operations and decision-making
- Apply advanced prompt engineering and orchestration to build reliable AI solutions with consistent performance
- Advance operational excellence with monitoring, logging, and alerting systems to ensure reliable AI performance and positive impact on key business metrics
- Collaborate with stakeholders to gather requirements, develop and test solutions, and support deployment and production systems
- Our Tech Stack
- Java 23 μServices
- Spring Boot with Spring Cloud
- MySQL
- Terraform
- Docker
- AWS Fargate
- Event Sourcing
- Datadog, Opslevel, TeamCity
Application process
- We break it up into 3 stages:
- Initial call with Tech Talent Acquisition team (35-45 minutes)
- An experience & culture interview with one of our Leadership team to check that your ways of working align with our processes, mission, and values (1 hour)
- Tech interview with two engineers that is centred on pair programming, systems design, and technical questions (1 hour 30 minutes)
Salary benchmarks
Our take
For many ordinary people, insurance can be inaccessibly expensive. Marshmallow solves this problem by using data and technology to offer fairer coverage for car and van owners.
Car insurers generally quote drivers according to population data, and many drivers are overcharged due to age and demographics. By leveraging data and proprietary technology, Marshmallow can offer more accurate and personalised quotes delivered in minutes, meaning lower fees for drivers. Naturally, this approach has proven popular, with Marshmallow garnering impressive reviews and accolades since it first launched.
The insurtech space is becoming increasingly competitive, and more and more tech companies are moving into the car insurance space, so the company is currently looking to expand into other insurance areas as it grows into a multiproduct scale-up fintech company. Marshmallow’s unicorn status and doubling of profit since 2023 are clear indicators of the company’s ongoing success and scalability, and will help to facilitate this diversification.
For now, the company is focused on helping those outside the norm, such as those who have uprooted their lives and moved to the UK. But in the future, it hopes to expand to any group of people who are unfairly marginalised and whose problems Marshmallow is uniquely positioned to solve.
Kirsty
Company Specialist at Welcome to the Jungle
Insights
Company
Employee endorsements
Open and honest communication
"At Marshmallow information is 'over-shared' and this starts from the CEOs and continues through the organisation. People across the business are..."
Funding (last 2 of 5 rounds)
Apr 2025
$90m
SERIES C
Sep 2021
$83m
SERIES B
Total funding: $208.2m
Company benefits
- Flexible working - Manage your own time flexibly. Just make sure your team is happy too.
- Ben benefits - Get your hands on your flexible benefits budget with the Ben Mastercard and spend it wherever you want.
- Competitive bonus scheme - designed to reward and recognise high performance 🌟
- Private healthcare - We want to support everyone’s wellbeing at Marshmallow, which is why we offer private healthcare insurance with Vitality.

- Cycle to work scheme - We’re registered under the Cycle-to-Work scheme, so you can buy a new bike tax-free. Lycra shorts optional.
- Mental wellbeing - We have partnered with Oliva to offer mental health support and make therapy sessions more accessible.
- Learning and training - Personal budgets for books and training courses to help you grow in your role. Weekly book clubs and learning sessions. Plus 2 days a year - on us! - to further your skillset.
- Company socials - We give all of our teams monthly budgets to get to know each other better outside of work. Plus we have company-wide socials every two weeks, themed parties, and more.
Company values
- We are relentless
- We are bold
- We are challenging
- We have no ego
Company HQ
Old Street, London, UK
Articles
Leadership
Oliver Kent-Braham
(Co-CEO)Previously worked in Growth & Partnerships at Yoti and Leveraged Finance at Investec. Previously founded Reel Money.
Alexander Kent-Braham
(Co-CEO)Previously worked in Product at Yoti. Also co-founded Reel Money and was an Analyst at hedge fund QCM.
People progressing
Joined as Software Engineer, being promoted to Technical Team Lead after 10 months and now Staff Engineer.
Diversity, Equity & Inclusion at Marshmallow
- To solve big problems, we need exceptional people from all walks of life. We're creating a culture where everyone feels empowered to bring their unique perspectives and boldest ideas to the table. Belonging - As a community, we foster an environment where everyone feels supported and safe to bring their authentic self to work. Recognition - We recognise and celebrate the differences in our experiences, understanding that our unique contributions help us collectively deliver our best work. Influence - We’re empowered to share our voice and have influence. We value diversity of thought, knowing we are better through our collective perspectives and experiences.
Share this job
View 29 more jobs at Marshmallow