Backend Engineer, Ruby (Senior) | £70,000-£150,000 + Equity

London, England, United Kingdom Full-time

Cleo is an AI assistant that helps over 400,000 people in the UK, US and Canada feel great about their money. We're one of the fastest growing startups on the planet backed by the founders of Skype, Transferwise and Zoopla.

We're looking for a pragmatic tenured engineer that can help us deliver an amazing product at scale. You'll work within a bright experienced team of 5 backend engineers and a wider engineering team of 8 growing to 16 over the next year.

We want Cleo to be known for being one of the best engineering organisations anywhere and hope you'll make a big contribution to building that culture.

What you'll be working on:

Broadly, you'll be engaged in the following:

  • Product. 90% of your time will be building new features and improving existing ones. We love getting features into users’ hands early, learning and iterating. We're exceptionally data driven.
  • Bank data API integrations. We use various third party services for banking data aggregation and plan on integrating more more providers throughout this year.
  • Payments. From paying friends to saving automatically, you’ll write code that moves money safely.

Our Stack:

  • Ruby on Rails
  • Minitest
  • Sidekiq
  • React
  • Postgres
  • Redis
  • Heroku
  • Github
  • CircleCI

Why you should join:

You will;

  • get to work at one of the fastest growing, venture-backed startups anywhere in the world. We have gone from 200,000 users in February to over 400,000 by June.
  • work with one of the smartest, dedicated and passionate teams in Europe.
  • have a genuine impact on the tens of thousands talk to Cleo each day. We make a positive difference to quality of life.

About you:


  • have the experience and (battle scars) to know when to over and when to under engineer.
  • can reduce complex problems to simple solutions consistently.
  • enjoy making those around you better engineers.
  • are excited by what we're building at Cleo.
  • are product-focused and care about making our users’ lives better.

Advantageous, but not essential;

  • Experience with React
  • Experience scaling platforms growing at pace (Postgres / Rails)

If you aren’t completely confident that you fit our exact criteria, please get in touch immediately. Humility is a wonderful thing - we're at least as interested in character as in talent.

We are an equal opportunity employer and value diversity.

Our process:

  1. A quick phone call with a member of our engineering team to find out more about your experience and why you want to work at Cleo.
  2. A small, fun take-home test.
  3. Onsite interview:
    1. Technical discussion with a senior engineer
    2. Pairing on an interesting problem
    3. Meet the CEO/COO

Apply for this opening at