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Senior Full-Stack Developer Next.js · React · TypeScript · AI-assisted development Onlined | Chandlers Ford, Hampshire Full-time, permanent | Hybrid: two days a week in the office Salary dependent on experience, discussed openly and early The opportunity We’re looking for an experienced full-stack developer who can take a project from the first client conversation through to a fully scoped, documented and working application. You’ll lead technical discovery, turn client requirements into comprehensive system specifications, and take ownership of the build. This includes understanding the business problem, defining how the whole system should work, estimating the development and delivering it through to launch. You’ll work with Next.js, React and TypeScript, using Claude Code and similar tools as part of your everyday workflow. This is a hands-on senior role with real influence over our technical decisions and how we deliver projects. About Onlined Onlined is a digital agency based in Chandlers Ford, with around 20 years of experience in web design, development, SEO and digital marketing. We’re a small team with long-standing client relationships and a growing portfolio of bespoke application development. You’ll work directly with the Managing Director and alongside colleagues in design, development, business analysis and project management. You’ll see projects through from beginning to end, know the people you’re building for and have the freedom to improve how we work. We often have several client projects running at once, so balancing priorities and communicating clearly matters. What you’ll do Technical discovery, scoping and documentation Lead the technical side of client discovery meetings, asking questions to understand business processes, user needs and what the system must achieve. Turn those conversations into clear, comprehensive technical documentation covering the full system. Define functionality, user roles and permissions, user journeys, workflows, data structures, integrations and requirements for security, performance and accessibility. Identify gaps, assumptions, dependencies and edge cases, and work with clients and colleagues to resolve them before development. Produce scopes of work and technical specifications with clear acceptance criteria, so clients, developers and testers understand what will be delivered. Define what is included and excluded, distinguish launch requirements from future phases, and explain technical options and trade-offs. Break the scope into practical development phases and produce realistic estimates. Keep documentation up to date as decisions are made and requirements evolve. You’ll work closely with our business analyst and project managers, but ownership of the technical specification and system design will sit with you. You should be comfortable creating the documentation yourself and taking clients through it to confirm understanding. Development and delivery Own technical delivery from the agreed specification through architecture, development, testing, deployment and ongoing improvements. Build applications using Next.js, React and TypeScript, working across interfaces, APIs, databases and integrations. Set up and maintain repositories, development environments and deployment pipelines. Use Claude Code and other AI development tools effectively, reviewing and validating their output. Build security, accessibility, performance and maintainability into your work. Test applications against the agreed requirements and acceptance criteria. Review other developers’ work, help resolve technical problems and contribute to shared development standards. Communicate progress, risks and scope changes clearly with colleagues and clients. You’ll develop estimates with input from the team and agree delivery plans with the Managing Director. Commercial negotiations and closing sales remain with the Managing Director. Some existing client websites use WordPress and WooCommerce. Other team members handle their day-to-day development and maintenance, but you may occasionally help with a more complex issue or integration. What we’re looking for Strong commercial experience delivering and maintaining production web applications. Exceptional attention to detail across technical documentation, application behaviour and interface quality, including edge cases and consistency with the agreed specification. Experience leading technical discovery with clients and translating meetings, business processes and ideas into comprehensive system specifications and technical documentation. The ability to scope a complete application, identify gaps and dependencies, define acceptance criteria and produce realistic development estimates. Strong React experience, with Next.js and TypeScript experience or the technical depth to become productive in them quickly. Confidence across the full stack, including APIs, databases, data modelling, authentication and deployment. Practical experience building software with Claude Code or equivalent AI coding tools, and a willingness to use Claude Code in this role. Sound engineering judgement: you can understand, review, debug and improve AI-generated code. A practical approach to testing, validation and reliable releases. Clear written and verbal communication, including explaining technical decisions to clients and non-technical colleagues. The ability to work independently, take responsibility and ask for input when needed. You don’t need to have held a formal technical lead title. What matters is that you can understand the requirements, document a workable solution and take it through to delivery. Useful additional experience Working in a digital agency or consultancy across multiple client projects. Experience with Astro for building fast, content-focused websites. Reviewing code, mentoring developers or helping improve development practices. Third-party integrations and connecting business systems. An eye for interface quality, usability and detail. WordPress or WooCommerce experience. How we work with AI AI is central to how we plan, document and build. We want someone who enjoys exploring what these tools make possible and can recognise where they fall short. You’ll have room to experiment with better workflows and help shape our approach. You’ll also be responsible for checking the accuracy of AI-assisted documentation and understanding the code that gets shipped. Specifications must reflect agreed client requirements, and applications must be reviewed and tested against them. What we offer Salary dependent on experience, with an open discussion early in the process. Hybrid working: two days a week in our Chandlers Ford office, with flexibility around how those days are arranged. Flexible working around core hours. 31 days’ holiday including bank holidays, plus your birthday off. Pension scheme. Budget and time for learning, tools and experimentation. Direct involvement in technical decisions and how we deliver projects. A small, friendly team where your contribution is visible and your ideas are heard. How to apply Please apply with your CV and a short introduction covering: One or two applications you’ve helped deliver and what you personally contributed. Your experience taking client requirements through discovery, scoping and technical documentation. How you use Claude Code or other AI coding tools in your development workflow. Your salary expectations and availability to start. Links to live projects, GitHub or a portfolio are welcome, but not essential. If your work is confidential, a brief description of the project and your role is absolutely fine. This is a hybrid position, so you’ll need to be able to attend our Chandlers Ford office two days a week. Pay: £36,000.00-£46,000.00 per year Benefits: Casual dress Company pension Free parking On-site parking Private medical insurance Work from home Ability to commute/relocate: Chandlers Ford, Hampshire: reliably commute or plan to relocate before starting work (required) Application question(s): Can you attend our Chandlers Ford, Hampshire office two days every week from your start date? Education: Bachelor's (required) Language: English (required) Work Location: Hybrid remote in Chandlers Ford