Senior Software Developer in City of Westminster

This role is a Full Stack JavaScript Developer responsible for designing, building, and maintaining secure, scalable, and high-quality applications that extend and enhance our ITSM platform (ServiceNow). Operating within a cybersecurity-focused Managed Services environment, this role requires strong full-stack JavaScript expertise across backend, frontend, and API development, combined with a security-first mindset. The developer will take ownership of end-to-end solutions—from requirements and design through implementation, testing, and support—working closely with ServiceNow administrators, engineers, and business stakeholders.

Key Responsibilities

• Application Development: Design and develop custom JavaScript applications within our ServiceNow platform to automate business processes and resolve complex operational challenges.
• Requirements Gathering: Collaborate with stakeholders across the organization to understand their needs and translate them into technical solutions within ServiceNow.
• Security & Compliance: Implement secure coding practices aligned to SSDLC principles, including data protection, access control, and auditability.
• Customization and Integration: Customize existing applications and integrate with external systems and APIs to enhance functionality and user experience.
• Quality Assurance: Conduct thorough testing of developed applications and solutions. Ensure compliance with coding standards and best practices.
• Continuous Improvement: Identify technical debt and opportunities to improve platform reliability, developer experience, and delivery velocity.
• Documentation and Support: Create comprehensive documentation for developed applications and provide ongoing support and enhancements based on user feedback.
• Collaboration: Work closely with the System Administrators and other IT team members to ensure seamless implementation and operation of developed applications.

Skills, Knowledge & Expertise

• Very strong knowledge of JavaScript, NodeJS and the React framework.
• Experience with modern JavaScript tooling (ES6+, npm, build pipelines).
• Experience designing and consuming APIs in production environments.
• Ability to write clean, maintainable, well-documented code.
• Understanding of Secure authentication & authorisation techniques.
• Strong knowledge of both Server and Client Side JavaScript development.
• General programming skills and understanding of secure software development lifecycle (SSDLC).
• Excellent communication and teamwork abilities.
• Ability to manage multiple projects simultaneously and meet deadlines.
• Creative thinking and problem-solving skills.

Desirable Requirements

• Bachelor’s degree in computer science, information systems, or related field.
• Significant demonstrable experience specific to Full Stack JavaScript development.
• Other relevant certifications.
• Experience working in a security-focused environment.
• Knowledge of the ServiceNow Ecosystem is not a requirement, but would be useful.

Job Benefits

• Flexible Working: Balance your work and personal life with our flexible working options.
• Generous Holiday Allowance: Enjoy 25 days of holiday, plus bank holidays, with the option to buy up to 5 additional days of annual leave.
• Medicash & Critical Illness Scheme.
• Financial & Investment Benefits: Enjoy peace of mind with our Pension, Life Assurance, and Share Save Scheme.
• Community & Volunteering Programmes: Make a difference in your community with our volunteering opportunities.
• Green Car Scheme: Drive green and save money with our eco-friendly car scheme.
• Cycle Scheme: Stay fit and healthy with our cycle-to-work scheme.
• Special Time Off: Take time off for those big moments in life, like getting married/entering into a civil partnership, becoming a grandparent, and welcoming home a new pet.
• Family Planning: Benefit from our generous maternity and paternity leave, as well as time off and support for those undergoing fertility treatments.