Senior Software Engineer - React

As a Senior Software Engineer – React at Xantura, you will play a critical role in developing our self-service analytics and data visualisation capabilities, significantly enhancing user experience across our advanced analytics platform, OneView. You’ll help build innovative, scalable applications using React and Next.js, integrating seamlessly with OneView via REST APIs. You will be responsible for designing performant, server-rendered and statically optimised applications using Next.js, ensuring fast load times and scalable frontend architecture suitable for Azure-hosted, multi-tenant cloud environments. This role requires you to be a proactive self-starter who takes ownership of delivery, quality, and outcomes, operating within a structured engineering environment that values consistency, transparency, and continuous improvement. You will collaborate closely with our Product, Platform, Data Science, and Business Consulting teams to build intuitive, impactful user interfaces that empower public sector clients to harness data-driven insights effectively. Key Responsibilities Frontend Development & Technical Delivery Design, develop, and deploy responsive, interactive applications using React and Next.js Build server-side rendered (SSR), statically generated (SSG), and hybrid applications using Next.js Integrate applications with OneView’s REST APIs and backend services Ensure application performance, scalability, and maintainability in an Azure cloud environment Optimise applications for speed, accessibility, and reliability in production Collaboration & Agile Delivery Work within an Azure DevOps-driven delivery model, including backlog management, sprint planning, and tracking Collaborate with cross-functional teams in an agile framework Contribute to sprint ceremonies and deliver against agreed priorities Communicate effectively with stakeholders Quality Assurance & Maintenance Follow and promote strong engineering discipline, including clear acceptance criteria and peer review Contribute to and maintain CI/CD pipelines using Azure DevOps Ensure code quality through structured peer reviews and adherence to agreed standards Write clean, well-structured, reusable code with appropriate documentation Conduct thorough testing and debugging Take ownership of delivery through to production Identify and resolve performance bottlenecks Skills, Knowledge & Expertise We’d love to hear from you if you have: 5+ years of experience building frontend applications Strong proficiency in React and Next.js Understanding of SSR, SSG, and modern rendering strategies Strong JavaScript/TypeScript, HTML, and CSS skills Experience with Azure cloud environments Experience with Azure DevOps Experience with scalable SaaS applications Experience with REST APIs Understanding of performance optimization Experience working in agile teams Testing experience (Jest, RTL, Cypress) Understanding of CI/CD Awareness of security best practices Structured and disciplined approach to delivery Bonus points if you have: Experience with Azure App Services or Static Web Apps Familiarity with Azure AD / Entra ID Experience with advanced Next.js features Backend knowledge (Node.js, Python, SQL Server) Public sector experience Accessibility (WCAG 2.1) Location – This is a hybrid role based in our office in London (Borough). You would be expected to be able to work from the office at least 1-2 days per week. Job Benefits Competitive salary reviewed annually Work for a passionate, mission-driven company solving society’s big problems Work flexible hours around life commitments with a focus on delivering company value rather than hours worked Ability to work remotely (excluding face-to-face Team Meetings and client meetings) Training and development opportunities 25 days annual leave (plus bank holidays) Company pension Private medical insurance Generous enhanced parental leave policies Cycle to work scheme Flu Vaccinations, Eye Test and contribution towards Glasses for VDU use Employee Assistance Programme Mental health and wellbeing support Remote GP access Counselling/therapy Physiotherapy Medical second opinions