Just
Backend Software Engineer
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Backend Engineer
Salary: £60,000-£80,000 DOE (Junior to Mid-Level)
Location: Remote in the UK - We like to get together on a monthly basis to work through problems in person. However, if you're based in London and prefer working in an office, we have a co-working space you can use.
About Just
Just is rebuilding auto insurance infrastructure from the ground up. We’re replacing outdated demographic proxies with mobile-first telematics, real-time behavioural data and advanced machine learning to create a more agile, usage-based insurance platform. Our pay-per-mile and dynamic risk-assessment model delivers instant 20-second quotes, flexible payment options and savings of up to 50% for safe drivers.
The impact is already clear: rapid customer growth, strong loss ratios and a trusted customer reputation backed by over 2,000 five-star reviews.
We’re now looking for a Backend Engineer to join our lean, agile and product-focused engineering team as we continue to build a modern auto insurance company.
The role
As a Backend Engineer at Just, you’ll play a key role in designing, building and maintaining the scalable APIs, services and systems that power our core platform, mobile applications and machine learning pipelines.
This is not a role where you’ll be stuck maintaining outdated legacy systems. You’ll be working on modern cloud infrastructure, building greenfield features, improving data flows and directly influencing the technical architecture of a fast-moving product.
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You’ll join an engineering team that cares deeply about high-quality code, good architecture, evolvable systems and solving real customer problems.
What you’ll be doing
- Responsible for developing and maintaining our Node.js services, working across backend systems that support our insurance platform, mobile apps and partner integrations.
- Contribute to the architecture, future direction and sustainability of Just’s engineering strategy, helping shape how our systems scale as the business grows.
- Work closely with product, design and other engineers to deliver high-quality features quickly and thoughtfully.
- Take ownership of the services you build, including reliability, observability and participating in on-call responsibilities.
Our technology
- Modern, cloud-native engineering stack with a focus on scalable, maintainable and easy-to-evolve systems.
- Backend services built in Node.js and TypeScript, with GCP as our main cloud platform.
- Use of Postgres, alongside Datastore and Redis for specific use cases.
- Frontend and mobile products built with React, React Native and TypeScript.
- Domain-Driven Design and Hexagonal Architecture across core services to ensure complex insurance domains are expressed clearly and can evolve quickly.
- Highly event-driven systems with asynchronous communication using Pub/Sub.
- Observability tools include DataDog for metrics, APM, distributed tracing and wider system monitoring.
- Use of CircleCI for build pipelines across backend and frontend, and infrastructure deployment using Terraform.
- Backend services in a monorepo with GraphQL as the main public API surface.
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What we’re looking for
- Passion for backend engineering, distributed systems and building reliable software.
- Experience building systems in Node.js, using either TypeScript or JavaScript.
- Ability to write well-tested, maintainable code.
- Comfort in thinking about architecture, system design and production service behavior.
- Ability to explain complex technical concepts clearly to engineers, product teams and non-technical stakeholders.
- Good understanding of computer science fundamentals and experience working in a fast-moving environment using Agile and Lean start-up principles.
Nice to have
- Experience working in a start-up, scale-up or high-performing engineering culture.
- Experience with GCP, GraphQL, event-driven architecture, Terraform, DataDog, Domain-Driven Design or Hexagonal Architecture.
Why join Just?
- Opportunity to join a high-quality engineering team building a modern insurance platform from the ground up.
- Real technical autonomy, the chance to influence architecture and the opportunity to work on complex, real-world data and infrastructure challenges at scale.
- Enjoyment in building clean, reliable backend systems, working with modern cloud infrastructure and solving meaningful customer problems.
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