Principal Software Engineer

Staffordshire 50K - 70K Permanent


Unique opportunity to join one of the UK’s leading Digital Services Marketplace! The services and user experiences they've already created are being used by more than 5,000 agencies, brands and in-house marketing teams all around the world, and they’re continuing to expand.

Your Mission

To mentor and lead a small team of software engineers to solve technical challenges and create efficient, reusable code to help scale the platform. You’ll be responsible for the planning, project management and reporting of new engineering implementations within the platform.


• Mentor a small team of software engineers to create efficient, reusable code that can be deployed and utilised in many parts of the platform now and in the future
• Conceive solid engineering ideas, layout roadmaps for development and create a user-experience focussed delivery
• Analyse current platform to identify technical inefficiencies and optimise them for maximum speed and scalability
• Help create and maintain stringent unit testing to verify code behaviour independently from other parts of the system
• Always work to high standards and maintain procedures to help minimise technical debt
• Utilise trouble and debugging skills and techniques to find problems within existing platform and take the steps to resolve them

The Skills You Might Need

• PHP 7.3+
• OOP using frameworks such as Laravel / CodeIgniter
• MySQL / MariaDB
• JavaScript (with React, jQuery, etc.)
• CSS with SASS (SCSS)
• Version control using GIT
• Docker
• AWS, pipelines & application deployment
• Unit Testing

Experience That Will Be Useful

• 3+ years experience of using server side patterns and languages like PHP (Laravel/CodeIgniter)
• Experience in managing a hosting environment, including database administration as well as scaling applications to handle load changes
• Adhering to ‘security by design’ principles to minimise attack surface area, establish secure defaults and fail securely
• Some knowledge of accessibility and security compliance
• An understanding of GDPR and its role in application development and data storage
• Experience with version control, such as Git
• Experience in working with stakeholders to create scopes for new project developments
• Good organisation and leadership skills to mentor and drive engineering talent
• Good with verbal and written communication skills and good interpersonal skills to handle a hybrid home / office working environment
• Experience with creating documentation for code implementation


Here's just some of the things you can expect:

• WFH / office hybrid working (2-3 days in office)
• Yearly Christmas Bonus based on overall company performance
• Company Pension Scheme with Now Pensions
• All the tech you need to fulfil your role to its full potential
• Personal development opportunities based on related skills
• 28 days holiday inclusive of Bank Holidays

When submitting your application to Colossus Associates, please ensure you have your correct phone number and email address so we can contact you asap regarding your application. For confidentiality purposes, please remove any reference contact phone number's and email address details from your CV.
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