Mid-Level Full-Stack Developer

Sharp End Partnership, Ltd.; Greater London; Hybrid; GBP 50,000 - 75,000; Full time

Job summary

Sharp End Partnership, Ltd. is hiring a mid-level Full-Stack Developer to join the studio’s engineering team. You’ll split time between frontend and backend work, turning high-fidelity concepts into real products across web and mobile platforms. You’ll ensure quality, maintainability, and design alignment as projects scale.

You’ll build features, refactor code, and contribute to APIs, tests, and the design system while collaborating with designers through Figma handoffs and reviews.

Qualifications

• Experience building full-stack web apps with frontend and backend.
• Proficient in Express and/or Next.js for APIs.
• Strong CSS skills and responsive UI development.
• Experience with SQL/NoSQL databases.
• Ability to write automated tests (Jest, Cypress).

Responsibilities

• Build and ship features across client and internal products.
• Refactor and improve existing codebases across the studio’s project portfolio.
• Design and build APIs using Express and/or Next.js (API routes and server actions).
• Handle data modelling, authentication, and integration with third-party services.
• Work with a combination of SQL and NoSQL database solutions.
• Write and maintain automated tests (Jest, Cypress, etc.).
• Contribute to the design system and standards across projects.

Skills

Express/Next.js

Data modelling

Authentication

Tailwind CSS

REST/GraphQL

Web accessibility

Jest/Cypress tests

UI/UX collaboration

Tools

Express

Next.js

GraphQL

REST APIs

Job description

We are hiring a mid-level Full-Stack Developer to join the studio’s engineering team. This role is hands-on and delivery-focused.You’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.

• Build 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
• Design and build APIs using Express and/or Next.js (API routes and server actions)
• Handle data modelling, authentication, and integration with third-party services
• Work with a combination of SQL and NoSQL database solutions
• Work directly with designers through Figma handoff and review
• Translate high-fidelity designs into accurate, responsive UIs
• Build fully accessible UIs from the ground up, rather than adding accessibility as an afterthought
• Write and maintain automated tests (Jest, Cypress, etc.) across frontend and backend
• Contribute to and help evolve the studio’s design system, ensuring consistent standards across projects
• Integrate with REST, GraphQL, and SOAP APIs to connect our apps to the range of services our clients use
• Participate 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

Core skills

• 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 including style frameworks such as 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
• Curious, pragmatic, and cares about craft

We also value

• Experience with AWS or 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