Top Web Developer Jobs in Belfast

Build and maintain large-scale WordPress platforms, develop reusable plugins and custom blocks, implement features, optimize performance and accessibility, debug and refactor code, collaborate with teams and clients, and take increasing technical ownership on projects.

Maintain and update client websites for automotive dealership accounts: implement content and structural changes, fix redirects and errors, optimize for SEO and performance, work in CMS platforms (e.g., WordPress), and collaborate with SEO, content, and design teams in a fully remote agency environment.

The Senior Web Developer will implement user-facing features, optimize web applications, and build frameworks to enhance development efficiency at CoinMarketCap.

Looking for developers with e-Commerce platform experience, strong JavaScript skills, and knowledge of HTML/CSS, working on high-profile projects.

Responsible for architecting and taking ownership of complex web projects, mentoring other developers, and optimizing performance and security in a WordPress context.

Build and maintain internal Web Platform tooling and libraries used by M&S engineering teams. Own end-to-end platform features, improve CI/CD, monorepo health, testing, observability, and reliability. Mentor engineers, collaborate across teams, and operate platform services with a production-first mindset.

Build and evolve web platform capabilities — shared tooling, libraries, CI/CD and monorepo architecture — to improve developer productivity. Set technical direction, own architecture decisions, collaborate with teams, and mentor engineers.

The Ruby Engineer will focus on web scraping and browser automation, fix code issues promptly, support customers, and enhance search engine integrations.

Design and implement frontend applications using JS, CSS, React, and Flutter. Collaborate on technical specs and contribute to documentation, ensuring user experience and performance.

Lead design and development of a high-performance Web SDK for device fingerprinting and behavior analytics. Implement algorithms for fingerprints and interaction capture, optimize cross-browser performance, build CI/CD and automated cross-browser tests, ensure data privacy/security, mentor engineers, conduct code reviews, and collaborate with product and QA to deliver scalable, maintainable SDKs.

Ship real open-source integrations and MCP servers to bring SearchApi to agent and automation frameworks. Create PRs, example apps, docs, and integration guides. Stay current with the agent ecosystem, pick high-leverage targets, and work independently to deliver production-ready integrations.