Senior PHP / Next.js Developer

Senior PHP / Next.js Developer (Fully Remote) - 3 to 6 month contract Up to £250 per day About Tizo Tizo is transforming how organisations manage complex customer journeys with a single, intelligent, configurable case management platform. Tizo digitally transforms workflows, compliance, and delivers better outcomes for customers and their consumers. Overview We are looking for an experienced Senior PHP / Next.js Developer to join our fully remote engineering team and play a key role in the continued development of our large-scale SaaS platform. This is a backend-first role, centred around designing and building robust APIs, developing new functionality, and modernising a substantial PHP codebase. Alongside this, you'll also contribute to our modern Next.jsfrontend, allowing you to work across the full stack where appropriate. Our platform has been developed over many years and continues to evolve. We are looking for a pragmatic engineer who enjoys improving and modernising existing systems through thoughtful design and clean code, rather than reaching for wholesale rewrites. You'll work closely with developers, project managers and clients to design, build and deliver high-quality software that is used daily by organisations across the UK. Location: Fully Remote (UK-based applicants preferred) Key Responsibilities Design, develop and deliver new features for a large-scale SaaS platformBuild and maintain scalable RESTful APIs that power our Next.js frontendDevelop and enhance backend services using modern PHP practicesContribute to frontend development using Next.js where requiredModernise and refactor legacy code while maintaining stability and backwards compatibilityDesign clean, maintainable and reusable application componentsOptimise existing systems for performance, scalability and reliabilityCollaborate with frontend developers to define API contracts and deliver seamless user experiencesWork directly with project managers and occasionally clients to refine technical solutionsParticipate in architecture discussions, code reviews and continuous improvement initiativesTroubleshoot and resolve technical issues across the application stack Technical Skills & Experience PHP Development Strong commercial experience developing applications in PHPExcellent understanding of Object-Oriented Programming (OOP)Strong understanding of MVC architecture and separation of concernsCommercial experience with MVC frameworks such as CodeIgniter, Symfony or similarExperience building scalable, maintainable applicationsComfortable working within an established codebase and continually improving it using modern development practicesStrong understanding of software design principles and clean architecture Frontend Development Commercial experience with Next.jsStrong knowledge of ReactGood understanding of JavaScript and/or TypeScriptExperience consuming and integrating RESTful APIsComfortable working across both backend and frontend codebases Databases Strong experience with relational databases such as MySQL, MariaDB or PostgreSQLAbility to write, optimise and troubleshoot complex SQL queriesExperience designing efficient database schemasUnderstanding of indexing, query optimisation and database performance tuningStrong understanding of transactional systems and data integrity APIs & Integration Strong experience designing and developing RESTful APIsExperience working within API-first architecturesUnderstanding of API versioning and backwards compatibilityExperience integrating third-party services and external APIsKnowledge of authentication and authorisation (JWT, OAuth or similar)Ability to produce clean, consistent and well-documented API responses Development Practices Strong Git experienceExperience with CI/CD pipelinesComfortable participating in peer code reviewsUnderstanding of automated testing principlesExperience working within Agile development teamsExposure to AWS or other cloud platforms would be beneficial Desirable Experience Although not essential, experience with any of the following would be advantageous: DockerAWSElasticsearch/OpenSearchRedis or background job processingEvent-driven or message queue architecturesLarge multi-tenant SaaS applicationsSecurity-focused developmentHigh-traffic or business-critical applications Personal Attributes You'll be someone who enjoys building software that lasts. You're happy working on an established product, modernising it where it makes sense, and balancing technical excellence with practical delivery. If you're a strong PHP developer who also enjoys working with modern frontend technologies like Next.js, and you're looking for a fully remote role where you can make a genuine impact on a large, evolving platform, we'd love to hear from you. We're looking for someone who: Enjoys solving complex technical problemsIs pragmatic and focuses on delivering value rather than chasing technology trendsTakes pride in writing clean, maintainable and well-documented codeIs confident working independently in a fully remote environmentCommunicates clearly with both technical and non-technical colleaguesEnjoys collaborating across backend and frontend developmentIs proactive, self-motivated and keen to continually improveEnjoys sharing knowledge and contributing positively to the wider engineering team What We Offer Fully remote workingFlexible working hoursOpportunity to work on a mature, large-scale SaaS platform with an active development roadmapInteresting technical challenges across both backend and frontend technologiesModern technology stack including PHP, Next.js, AWS and RESTful APIsOpportunity to influence technical direction and architectureSupportive, collaborative engineering cultureExposure to a wide variety of projects, integrations and technologiesOngoing opportunities for professional development and learning