Javascript Developer

Node.js Developer (Full Stack)

Location: London

Security Clearance: Must hold active DV Clearance

Employment Type: Contract (flexible)

Duration: 6 Months

Overview

We are seeking an experienced DV Cleared Node.js Developer to join a high-performing engineering team working on secure, mission-critical systems. This is a fantastic opportunity to contribute to complex projects within a highly secure environment, using modern technologies across both backend and frontend development.

You will play a key role in designing, developing, and maintaining scalable applications, working closely with cross-functional teams in an Agile environment.

Key Responsibilities

Design, develop, and maintain robust backend services using Node.js

Build secure, scalable APIs and microservices architectures

Develop responsive and user-friendly frontend components using modern frameworks

Collaborate with UX/UI designers to deliver high-quality user experiences

Work within Agile / Scrum teams, contributing to sprint planning and delivery

Ensure code quality through testing, code reviews, and best practices

Maintain and improve system performance, security, and reliability

Integrate with third-party systems and internal services

Work in highly secure environments adhering to strict compliance requirements

Required Skills & Experience

Backend

Strong commercial experience with Node.js (Express.js / NestJS preferred)

Experience building RESTful APIs and microservices

Good understanding of asynchronous programming and event-driven architecture

Familiarity with databases such as MongoDB, PostgreSQL, or similar

Knowledge of authentication and security best practices (OAuth, JWT, etc.)

Frontend

Solid experience with modern frontend frameworks such as:

React, Angular, or Vue.js

Strong proficiency in JavaScript / TypeScript

Experience with HTML5, CSS3, and responsive design

Understanding of UI/UX principles

General

Experience with Git and version control workflows

Familiarity with CI/CD pipelines and DevOps practices

Experience working in Agile environments

Strong problem-solving and communication skills

Desirable Skills

Experience with cloud platforms (AWS, Azure, or GCP)

Knowledge of containerisation technologies (Docker, Kubernetes)

Familiarity with infrastructure as code (Terraform, CloudFormation)

Experience in secure or government environments

Understanding of testing frameworks (Jest, Mocha, Cypress)

Security Requirements

Active DV Clearance is essential

(Candidates must currently hold valid clearance to be considered)