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Senior Developer

  • Development
  • Full-time
  • London, GB
  • Remote friendly

2021-11-24 16:44:09 UTC

ON is a fast-moving, design-minded technology partner — building compelling and high-impact digital experiences and software platforms. We work with forward-thinking companies that value design and user experience.

We’re not your typical agency, and place a heavy emphasis on bespoke, best-fit solutions that are tailored to the full stack challenges that we are solving — with technical rigour behind our delivery, and a focus on the right tools for the right job.

As a rapidly growing business, we’re looking for talented developers to join our multidisciplinary team of technologists, designers, strategists and researchers. The role is varied, and gives the opportunity to see through project delivery from start to finish, and not be pigeon-holed into a single area.

Our work spans a wide range of sectors, including MedTech, FinTech, Creative, Venture, FoodTech; with an increasing focus on sustainability through our work with charities, ClimateTech, and AgTech companies.

If that sounds like your cup of tea, we’d love to chat.

About the role:

We sit at the intersection of design and technology and value developers with a keen eye for detail, and a good mix of technical, commercial and UX knowledge. You will take ownership of the entire lifecycle of development and work closely with our delivery teams and senior technical leads.

This is a permanent, full-time position. We’re headquartered in London, we embrace flexible working, and are happy to accept candidates from anywhere in the UK. You’ll be working alongside a multidisciplinary team of technologists, designers, strategists and researchers to deliver digital projects for clients, and for ON internally.

There's a great deal of variety in the role - projects can vary greatly in scope and challenge, and regular rotation can be expected. You’ll have the opportunity to manage and mentor other developers, and have a hand in evolving our processes and culture, and building the team.


  • Be involved in client meetings, to identify needs and requirements and manage solution development

  • Validate technical feasibility and estimates of proposed solutions

  • Prepare, plan, co-ordinate, lead and be responsible for the development and testing of websites and web applications

  • Contribute to the architecture and design of projects and strategic initiatives, with specific focus on user experience, usability, stability, and efficiency

  • Lead and direct teams and give guidance in resolving problems

  • Build well-crafted and maintainable websites and web applications

About you:

We are looking for someone that is passionate about their craft, dynamic, and detail oriented. The kind of person who loves to problem solve and build products that they can be proud of.

  • 5+ years of experience in coding commercially

  • Excellent grasp of semantic markup and scalable styling

  • Excellent grasp of modern JavaScript

  • 3+ years of experience with React or Ruby on Rails

  • Project leadership skills

  • Good time management abilities

  • Excellent communication skills - both verbal and written

  • Experience mentoring junior developers

The ideal candidate would also have:

  • Experience of working with Next.js

  • Experience of working closely with designs and UX

  • Experience with web animations and visualisations

  • Experience working with APIs

  • Basic to intermediate SEO knowledge

Company Benefits

  • Access to the company bonus scheme

  • 24 days paid holiday per year, plus national holidays

  • Remote working as standard

  • We’ll provide an Apple laptop and an external monitor along with any equipment you need to be comfortable working from home

  • Work from home allowance, we’ll contribute to your internet

  • Funding and resources to continue professional development

  • Additional benefits with each year of service

    We have quarterly reviews, and realise the importance of giving people the time and resources they need to develop their skills.

    We are committed in our journey to eliminating discrimination, encouraging and valuing diversity amongst our workforce. We welcome enquiries from everyone.

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Remote restrictions

  • Must be a resident of United Kingdom