Senior Web Developer Job Description: Role, Duties and Requirements

A Senior Web Developer leads the design, build and maintenance of web applications. This role is suitable for experienced engineers who can deliver end-to-end solutions, guide technical direction and mentor colleagues while working closely with product and design stakeholders.

Senior Web Developer Job Profile

The Senior Web Developer is responsible for architecting and delivering high-quality web solutions that meet functional requirements and non-functional expectations such as performance, security and accessibility. The role requires strong technical judgement, an ability to balance short-term delivery with long-term maintainability and a commitment to coding standards and documentation.

This position acts as a technical point of contact within cross-functional teams, contributing to planning, estimation and continuous improvement of development practices. The Senior Web Developer will be expected to lead by example, provide constructive code reviews and support the professional development of more junior engineers.

Senior Web Developer Job Description

The Senior Web Developer designs, develops and refines web application components across client and server layers, ensuring robust integrations, responsive interfaces and resilient deployments. The role requires hands-on development as well as system-level thinking to influence architecture, reduce technical debt and improve operational stability.

Working within an iterative delivery model, the Senior Web Developer collaborates with product managers, designers and other engineers to translate requirements into clear technical tasks, estimates and acceptance criteria. The role includes ownership of code quality through automated testing, code reviews and adherence to security and accessibility standards.

Expectation includes proactive problem solving in production environments, documenting decisions and contributing to the technical roadmap. The Senior Web Developer is expected to mentor peers, share knowledge, and promote effective development practices that support continuous delivery and measurable improvements in application performance and reliability.

Senior Web Developer: Duties and Responsibilities

• Lead the design and implementation of scalable, maintainable web applications across front-end and back-end components.
• Write clean, well-tested and well-documented code that follows agreed coding standards and best practice.
• Define and review application architecture and propose improvements to reduce complexity and technical debt.
• Collaborate with product owners and designers to refine requirements and produce reliable estimates and delivery plans.
• Develop responsive, accessible and cross-browser compatible user interfaces with attention to usability and performance.
• Optimise client and server performance, including page load, rendering and runtime efficiency.
• Apply security best practice, perform threat analysis and address vulnerabilities in a timely manner.
• Design and implement APIs and integrate with external services using robust error handling and monitoring.
• Establish and maintain automated testing, build and deployment practices to support continuous delivery.
• Conduct thorough code reviews, provide constructive feedback and support skill development across the team.
• Investigate, troubleshoot and resolve production incidents and perform root cause analysis to prevent recurrence.
• Maintain and produce clear technical documentation, runbooks and release notes for stakeholders and operational teams.
• Participate in sprint planning, backlog grooming and effort estimation to align delivery with business priorities.
• Evaluate emerging techniques and approaches, contributing to the technical roadmap and adoption recommendations.

Senior Web Developer: Requirements and Qualifications

• Degree in Computer Science, Software Engineering or a related discipline, or equivalent practical experience.
• Typically five or more years of professional experience in web development, with a demonstrable track record of delivery.
• Strong proficiency in HTML, CSS and modern JavaScript and an understanding of front-end engineering principles.
• Experience in server-side development and designing reliable, well-documented APIs.
• Solid knowledge of relational and non-relational databases and techniques for query optimisation.
• Familiarity with automated testing approaches and an emphasis on quality assurance throughout the development lifecycle.
• Good understanding of web security principles and secure coding practices.
• Experience in performance profiling, monitoring and optimisation for web applications.
• Proven experience conducting code reviews, mentoring colleagues and providing technical leadership.
• Strong communication skills and the ability to work with cross-functional stakeholders at all levels.
• Ability to operate effectively in an agile delivery environment and manage competing priorities.
• Attention to detail in documentation, release management and operational readiness activities.
• Awareness of accessibility standards and responsive design principles to ensure inclusive user experiences.