Middle Backend Engineer (Node.js)

Impressit is looking for a Middle / Middle Strong Backend Engineer to join a cross-functional product team working on a distributed microservices platform for one of London's leading internet providers. This is a great opportunity to contribute to a large-scale telecom platform that powers customer-facing applications, internal operational tools, and network provisioning services, while working with modern technologies and international teams.

— Build and maintain backend microservices using Node.js and the internal framework
— Develop and support customer-facing and internal web applications using React.js and Next.js
— Design and implement REST APIs and asynchronous integrations using Azure Service Bus
— Integrate with internal and third-party systems, including Salesforce, Auth0, and other business platforms
— Work with PostgreSQL, Cosmos DB, and Redis to build scalable and reliable services
— Participate in the full software development lifecycle, from design discussions to deployment
— Write and maintain automated tests to ensure high code quality
— Contribute to Azure-based infrastructure, Dockerized deployments, and CI/CD pipelines
— Collaborate closely with product managers, DevOps engineers, and cross-functional development teams
— Troubleshoot production issues and contribute to technical documentation and architecture improvements

— 3+ years of commercial experience as a Backend Engineer
— Strong hands-on experience with JavaScript/TypeScript and Node.js
— Practical experience with React.js; experience with Next.js will be a strong advantage
— Solid understanding of microservices architecture and REST API design (RPC knowledge is a plus)
— Experience with Microsoft Azure and its core services
— Hands-on experience with messaging systems (Azure Service Bus or similar)
— Experience with both relational and NoSQL databases (PostgreSQL, Cosmos DB) and caching solutions (Redis)
— Experience with containerization using Docker
— Good understanding of authentication and authorization mechanisms (OAuth2, Bearer Tokens, Auth0 or similar)
— Proven ability to write automated tests (unit, integration, Cypress)
— Good understanding of CI/CD workflows and Git-based development
— Excellent problem-solving and debugging skills
— Good communicator, comfortable working in cross-functional distributed teams
— Strong Computer Science fundamentals (data structures, OOP, architecture)
— Upper-Intermediate or higher level of English

— Experience with Salesforce integrations
— Familiarity with Redux, Easy Peasy, or other state management libraries
— Experience with Tailwind CSS, SASS/SCSS, Vite, or Webpack
— Experience with headless CMS platforms
— Previous work in the telecom or ISP domain
— Experience building internal frameworks or improving developer experience
— Passion for clean code, scalable architecture, and high-quality user-focused solutions