Mid-Level Full-Stack Developer

Mid-Level Full-Stack DeveloperLocation: Hybrid - LondonSharpEnd is an experience-led connected studio, partnering with ambitious brands to reimagine the real world as a connected platform. We design and deliver connected physical–digital experiences for global brands, from NFC-connected products and hardware-enabled products to mobile, web, and in-store systems.We are hiring a mid-level Full-Stack Developer to join the studio's engineering team. This role is hands-on and delivery-focused.The RoleYou'll build and ship both the frontend and backend of studio projects, splitting your time between new feature work and improving what we've already shipped. You'll work closely with design and production to turn high-fidelity concepts into real, working products across web and mobile platforms - playing a direct role in how our connected experiences look, feel, and perform for some of the world's biggest brands.You are accountable for the quality and craft of what you build, keeping codebases healthy as requirements layer on top of each other, and making sure what ships matches design intent without needing late-stage rework.Success in this role is measured by:Accurate, responsive UIs faithful to the designs, backed by reliable, well-structured APIsReliable, well-tested code that doesn't need late-stage reworksSmooth collaboration with designers and other engineers across projectsResponsibilitiesHands-On DevelopmentBuild and ship new features across client and internal products, working across the full stack.Maintain, refactor, and improve existing codebases across the studio's project portfolio.Contribute directly to critical-path code, prototypes, and code reviews.Backend & API WorkDesign and build APIs using Express and/or Next.js (API routes / server actions).Handle data modelling, authentication, and integration with third-party services.Work with a combination of SQL and NoSQL database solutions.Design CollaborationWork directly with designers through Figma handoff and review.Translate high-fidelity designs into accurate and responsive UIs.Focus on building fully-accessible UIs from the ground up, not adding accessibility as an after-thought.Code Quality & SystemsWrite and maintain automated tests (Jest, Cypress, etc.) across frontend and backend.Contribute to and help evolve the studio's design system, ensuring consistency of standards across projects.Integrate with REST, GraphQL and SOAP APIs to connect our apps to a wide range of services as determined by our clients.Delivery & Team CollaborationParticipate in code reviews, sprint planning, and technical discussions.Work across multiple concurrent projects, balancing speed with craft.Raise blockers and risks early rather than letting them surface late in delivery.About YouRequiredCurious, pragmatic, and cares about craft.Strong proficiency in JavaScript/TypeScript and React.Experience with Express and/or Next.js for building backend services or API routes.Comfortable with data modelling, authentication, and integrating with third-party APIs.Solid CSS skills, ideally with experience in the use of style frameworks, e.g. Tailwind CSS.Comfortable writing automated tests and integrating with GraphQL and/or REST APIs.Happy working across multiple concurrent projects as part of a team.Nice-to-HaveExperience with AWS, other cloud infrastructure.Three.js or other WebGL/3D experience — a plus for building immersive, interactive experiences.Experience with state management libraries.Familiarity with web accessibility (a11y) best practices.Performance optimisation experience (Core Web Vitals, bundle size, etc.).This Role Is Not ForDevelopers who want a single long-term product roadmap.Candidates who prefer narrowly defined tickets over design collaboration and problem-solving.Those who want to work in isolation rather than alongside designers and other engineers.How This Role Adds Value Over TimeBeyond individual projects, this role helps the Studio raise the bar on full-stack craft - improving how we build, test, and reuse patterns across the frontend and backend, not just shipping isolated features.What We OfferFollowing probation:Pension: 3% employer contribution (People's Pension, from 3 months).Holiday: 20 days + festive shutdown, plus 1 additional day per year of service (up to 5).Health Insurance: Vitality.Employee Assistance Programme (EAP).Cycle to Work Scheme and dog-friendly office.Work From Anywhere: Up to 2 weeks per year (UK time).Office Perks: Breakfast, drinks, and snacks.Salary: £40,000 - £60,000 assessed on experience.Culture: Collaborative, delivery-driven, and creatively ambitious.