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Senior Back-End Engineer

Engineering Full Time London

About us

We’re a bunch of techies, creatives and friendly finance folk, who’ve run our own businesses and side gigs – and helped others do the same. So we’ve come together, with Santander’s backing, to shake things up.

What if doing expenses from paper receipts was as simple as snapping a selfie? And you could get a clear view of your finances with a simple heads-up?

We’re here to save you time. Cut headaches. Smooth hassles. To make repetitive admin, endless paperwork, and tedious typing into spreadsheets, a thing of the past.

So we’ve created a place – for quick answers and inspiration. Business owner to business owner. A growing resource from people who go through the same as you.

And we’re making an app – your pocket business helper. Always on hand to make working life simpler.

The Role

Develop all server-side components and integrations to ensure the Asto back-end can adequately deliver the functionality, stability, security and performance to serve the front-end clients and the ambitions of the platform.

Key Responsibilities

Specifically this role will focus on the following themes:

  • Develop the core back-end services of our platform, supporting the mobile apps and ultimately a smooth customer experience
  • Build technical integrations with strategic third parties
  • Participate in Agile development streams involving product, design, backend and frontend engineering
  • Contribute to code reviews, pair programming
  • Ensure the delivery of quality software, via reusable, testable and efficient code
  • Perform functional and technical analysis
  • Support automated continuous delivery and monitor services in production
  • Demonstrate a balance between technical excellence and rapid delivery
  • Aid growing Asto into a leading tech company


  • Proficient knowledge of modern Java in the context of building backend services (with Spring Boot, Maven, other languages a bonus)
  • Demonstrable understanding of computing fundamentals, object orientated programming, micro-services, service oriented architecture, integration patterns (Kafka a bonus)
  • Good knowledge of containerisation and orchestration (Docker and Kubernetes)
  • Good experience building and interfacing with RESTful APIs (HTTP/JSON), and Web Services (SOAP/HTTP)
  • Understanding of client-side or front-end web tech (HTML, CSS, JS) to communicate with mobile and front-end devs
  • Good experience with both SQL and NoSQL databases such as MongoDB
  • Good experience with AWS (other cloud IaaS providers a bonus)
  • Familiar with security best practices
  • Experience with version control (Git)
  • Extensive experience of Agile Continuous Integration/Continuous Delivery ways of working, BDD and TDD, and use of a DevOps toolset, unit, integration and system test automation

Personal Skills

  • Great collaboration skills
  • Resilient to change and pace whilst also showing resourcefulness and the ability to work through challenging problems
  • Optimistic, open and personal


  • Relevant degree in Engineering/Computer science (or similar)
  • Industry experience is desirable