Backend Developer - PHP Laravel & C# .NET

Title: Backend Developer (PHP Laravel & C# .NET) Location: Remote (UK-based) with occasional in person events (approximately once per quarter) Salary: £45,000 Type: Full time, Permanent About Radical Radical is a dynamic, UK-based digital product agency that specialises in the definition, design, development, and support of bespoke web and mobile applications. We see ourselves as the long-term digital product partner for companies looking to continuously improve their applications through expert execution, transparent development, and strategic support. We bring clarity to complex ideas and deliver high-quality, fully supported digital products. This is a UK remote role, with fully funded, occasional in person meetings or social events (approximately once per quarter). What You’ll Be Doing We are seeking an experienced Backend Developer to be a key player in our cross functional teams. You will be responsible for the reliable delivery of diverse client projects, ranging from rapid proof of concept work to the development and maintenance of large scale production applications. The pace of agency work requires an ability to switch context, apply expertise across multiple projects, and collaborate directly with clients and internal stakeholders. Core responsibilities will include: Working across 2 key technologies: PHP Laravel and C# .NET.Technical planning and efficient delivery of solutions.Evaluating technical trade-offs between monolithic and service-oriented approaches across Laravel and .NET builds.Analysing existing codebases to improve query performance, reduce technical debt, and ensure data integrity.Collaborate with team members to deliver digital solutions for clients on time and to specification.Proactively research and recommend technical solutions, bringing new ideas to the table, and demonstrating a strong understanding of available off the shelf tools, architectural patterns, and development methodologies.Work on greenfield projects and the maintenance of existing projects for a variety of clients.Write clean and scalable code.Document technical solutions and participate in technical workshops. Skills and Experience It is essential that you have demonstrable expertise and commercial experience in the following areas: Commercial backend development experience in both PHP (Laravel) and C# (.NET)Proven ability to write clean, maintainable code across both stacks in production environmentsGit workflows: branches, PRs, code review etiquetteCI/CD fundamentalsProven ability to work in a fast moving agency or client facing environment, managing context switching across multiple projects.Experience working effectively with clients and fellow developers to clearly define technical specifications and deliver projects to a high standard. It would be advantageous to have experience in any of the following: AWS basics: EC2, S3, CloudFront, Lambda, RDS, IAM principlesReact.js and TypeScriptCross platform mobile app development using Flutter or React NativeDocker basics for reproducible environmentsVercel, Netlify or Render for deploymentsStatic generation and site performance: Next.js ISR, caching, SEO optimisationAutomated testing: PHPUnit, Pest, xUnit/NUnit, Jest, Cypress/PlaywrightAccessibility (a11y) What we offer A starting salary of £45,00025 days holiday plus bank holidaysA laptop and home working kitCompany social eventsHoliday buyback schemeA bonus for introducing contacts who are later hired by RadicalStatutory pension Application process Stage 1: Interest Apply via this ad. We’ll review candidates and create a first stage shortlist. Stage 2: First Stage Interview We will invite shortlisted candidates to a first stage video interview, in which we can find out a little more about each other. Stage 3: Final Stage Interview In a final stage interview (video call or in-person), we will conduct a structured technical Q&A with our engineering team. Rather than an offline coding task, this live conversation will focus on: System & API Architecture: Exploring how you design scalable backend structures and integrate third-party services.Framework Depth: Discussing "under the hood" mechanics, performance optimisation, and memory management in both Laravel and .NET.Real-World Trade-Offs: Evaluating how you handle technical debt, database bottlenecks, and refactoring legacy codebases in production environments. Once final interviews are complete we will be ready to submit a formal offer to the selected candidate.