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Software Developer (Mid-Senior)
at CharlieHR

go back to Developer Jobs
  • London
  • fulltime
  • ₤54000 - ₤64500 per year

We’re Charlie, a beautifully designed, easy to use HR software for small companies.

Our product makes hard things simple, has the warmth of a human, and ensures no team member is left behind.

Come and help us to Make Work Better.

In this role you will:

  • Build and improve Charlie, a Rails app using the latest versions of Rails and Ruby
  • Use our design system to ship functional and beautiful features that look and feel like Charlie
  • Operate in a cross-functional team with other developers, designers, product managers
  • Work with developers of all experience levels to ensure you’re constantly both learning and sharing your knowledge
  • Feedback into product and business decisions and make your mark on Charlie

A typical week will include:

  • Shipping updates as soon as they're ready, often multiple times a day
  • Working with other developers and reviewing code to maintain a high code quality and share knowledge across the team
  • Team and company-wide meetings where we discuss strategy, provide updates and share feedback


You must have:

  • Professional experience with Ruby, and Ruby on Rails
  • A very strong understanding of how the web and web applications work
  • Confidence as an individual contributor; you are driven to join us in building a great product
  • Excellent communication skills and a positive attitude; able to thrive in a team environment
  • An enthusiasm for mentoring junior developers and helping others excel
  • Experience and knowledge of databases, Git and Github

And the nice to haves:

  • Similar SaaS business experience
  • Worked with design systems
  • Familiarity with security (eg. ISO27001)
  • Worked with Heroku
  • A strong understanding of scaling web applications & performance

Our tech:

  • Ruby: Rails, Sidekiq, RSpec, Devise
  • Frontend: our design system is built with Ruby, JavaScript and Sass CSS
  • Infrastructure: Heroku, PostgreSQL, Redis, CI, Stripe API

We are an equal opportunities employer and believe in the power of a diverse, inclusive team. We welcome applications from all suitably qualified people, regardless of race, sex, disability, religion/belief, sexual orientation or age.

Why Charlie?

You’ll be joining a company that:

  • Works in small cross-functional teams with OKRs, so your work is always focused, goal-driven and agile
  • Is at an incredibly exciting stage of growth
  • Is made up of 30 close-knit, ambitious and dedicated people who genuinely enjoy spending time together
  • Has a clear and transparent career progression framework
  • Believes in helping every employee develop professionally along their chosen career path


  • Salary from £54,000 to £64,500 based on your level within our progression framework
  • £500 yearly learning budget
  • Equity options
  • Flexible working hours
  • Social events (Team lunches, evenings out, and two yearly company retreats)
  • Monthly "Exploration Days" when you can work on whatever
  • Bike to work scheme

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