Backend Javascript Developer Job Description - Role, Duties and Qualifications

This Backend Javascript Developer job description is for recruiters, hiring managers and candidates seeking a clear, role-specific summary of responsibilities, context and required skills. Suitable candidates have strong server-side Javascript experience, a focus on building reliable APIs and services, and the ability to collaborate with product and engineering teams to deliver maintainable backend solutions.

Backend Javascript Developer Job Profile

The Backend Javascript Developer is responsible for designing and implementing server-side components that support web and mobile applications. The role focuses on delivering robust, secure and performant services that meet product requirements and scale with user demand.

The purpose of this role is to translate requirements into maintainable backend systems, ensure reliable data flows and integrations, and contribute to the technical direction of backend engineering within cross-functional teams.

Backend Javascript Developer Job Description

This Backend Javascript Developer role involves end-to-end development of server-side features, including API design, data modelling and performance tuning. The role operates within agile product teams and requires regular interaction with product managers, frontend engineers, quality assurance and operations staff to ensure timely and reliable releases.

Expectations include producing well-tested, documented code, participating in code reviews, and applying best practices for security, observability and error handling. The developer is also expected to identify technical debt and propose practical refactors to improve system reliability and maintainability.

The role requires proactive problem solving, clear technical communication and the ability to prioritise work against business goals. The successful applicant will balance feature delivery with operational stability and continuous improvement of engineering practices.

Backend Javascript Developer: Duties and Responsibilities

• Design, build and maintain server-side components and APIs for web and mobile applications
• Translate product requirements into reliable backend services and data models
• Develop and maintain automated tests to ensure code quality and prevent regressions
• Participate in specification and architecture discussions to define scalable solutions
• Optimise performance and resource usage of backend services and data access patterns
• Implement robust error handling, logging and monitoring to support operational visibility
• Collaborate with frontend and QA teams to integrate and validate end-to-end functionality
• Conduct code reviews and provide constructive feedback to peers
• Maintain and improve existing backend systems, addressing technical debt where necessary
• Ensure data integrity and implement appropriate validation and security controls
• Prepare clear technical documentation for APIs, services and deployment processes
• Support release activities and troubleshoot production incidents as required
• Advocate and apply best practices in software engineering, testing and maintainability
• Mentor junior engineers and contribute to team knowledge sharing

Backend Javascript Developer: Requirements and Qualifications

• Proven experience working as a backend developer using Javascript in production environments
• Strong understanding of server-side architecture, API design and building scalable services
• Experience with designing and working with relational and non-relational data models
• Demonstrable ability to write automated tests and apply test-driven development principles
• Knowledge of security best practices for server-side applications and data protection
• Familiarity with performance profiling and optimisation techniques for backend systems
• Proven experience in debugging, logging and monitoring of production services
• Good communication skills with the ability to explain technical decisions to non-technical stakeholders
• Experience working in agile delivery environments and participating in iterative planning
• Strong problem solving and analytical skills with a focus on pragmatic solutions
• Ability to produce clear technical documentation and maintain code quality standards
• Degree or comparable qualification in computer science, software engineering or related discipline, or equivalent professional experience
• Willingness to learn, adapt and mentor others within the engineering team