C# .NET Software Developer


We are recruiting for C# .NET software developers to be part of our team building highly visible mobile commerce, transport and retail solutions using our software platform, Core Engine, delivering to iOS and Android devices across the world. You'll be focused, creative and enthusiastic about supporting great customer experiences as part of our development and support team.

This is a fabulous opportunity to become an essential part of a fast-moving, highly innovative, hugely successful team based just outside London in Watford, Hertfordshire.

Corethree is a high growth tech company, we specialise in mobile solutions, m-commerce and data manipulation. We’ve already developed an extremely credible reputation by delivering ground-breaking solutions to multiple blue chip clients including Transport for London, Santander, First Group, Go Ahead Group, Transport for Edinburgh, TfGM and Keolis. We have grown exponentially to UK market leader in our initial targeted sector, winning multiple awards along the way.

You'll be a structured and organised professional with demonstrable experience in this kind of role, and you’ll be a creative and innovative thinker, working with our operations and user experience design team to build fantastic public-facing applications servicing millions of journeys, customers and transactions.

We are an agency-like workplace and heavily use Jira for job management. Experience working with Jira and both agile and waterfall delivery methodologies is highly desirable.


  • Building software solutions in C# .NET using MongoDB and our cloud applications platform, Core Engine.

  • Building new client-facing n-tier web solutions using C#.NET, Core Engine and modern web technologies.

  • Following project delivery through to ensure fulfilment.

  • Working with the operations and client services teams to help design solutions to make our customers businesses more efficient, and to help make their customers lives easier.

  • Working in rotation as part of the support team, diagnosing and fixing software bugs and implementing new features across our estate of 90+ applications already deployed.

Skills and Experience

  • Education to degree level or equivalent.

  • Strong experience in supporting cloud-based .NET applications using environments like Amazon Web Services.

  • Experience working with NoSQL databases, with MongoDB advantageous but not essential.

  • Commercial experience of C# and .NET development, web and otherwise.

  • Good understanding of Object Orientated programming and modern design (design patterns, MVC etc).

  • Good understanding of IoD and dependency injection.

  • Systems integration using REST and SOAP web services.

  • Experience of Test Driven Design advantageous but not essential.

  • Experience working in a rapid Agile environment.

  • Version control using Git and Subversion.

  • Strong interpersonal skills, and it's is vital that you are a strong team player, motivated by individual and organisational success.

  • Ability to use own initiative and pay close attention to detail.

  • Excellent organisational and time management skills.

  • Positive attitude to dealing with people and problems.

  • Enthusiasm as an experienced user of technology products, such as smart-phones, phablets and tablets.

  • Up to date knowledge of the technology market, and a drive to make great products even better.

Salary & Benefits:

£Competitive + bonus + 23 days holiday + subsidised on-site gym membership + Mac laptop + pension Onsite parking and free transport to and from the main train station is provided. We also have a very posh coffee machine at your disposal, fresh fruit and nuts in abundance and even bottled water in the fridge, both still and sparkling!

If this is an opportunity you are interested in, then please send your CV, with a covering letter, to jobs@corethree.net.

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