Senior Backend Engineer, London, England, United Kingdom

Senior Backend Engineer

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Job Description:

Location: Hybrid 1-2 days/week onsite (Reading or Paddington), rest remote

Contracting period: 4 months with possibility to extend.

Role Overview

We are seeking a Senior Backend Engineer with strong Node.js expertise to design, build, and optimise cloud-native microservices. Youll work in a fast-paced, collaborative environment, delivering high-performance APIs and scalable backend systems for digital, telecom, SaaS, or high-transaction sectors. The ideal candidate combines architectural thinking with hands-on coding, thrives in containerised environments, and embraces DevOps practices.

Key Responsibilities

Design, develop, and maintain microservices in production using Node.js and modern frameworks (Fastify preferred; Express, Koa, or Hapi also considered).
Implement and maintain APIs using REST, GraphQL, OpenAPI, and Swagger standards.
Build cloud-native solutions using Docker, Kubernetes, and cloud providers (GCP preferred; AWS/Azure also relevant).
Apply best practices for security (OAuth 2.0, OIDC, CORS, CSRF).
Work with SQL and NoSQL databases such as PostgreSQL, MySQL, MongoDB, and Redis.
Ensure code quality with unit and functional testing using frameworks like Cypress, Mocha, or Jest.
Collaborate closely with DevOps teams, leveraging CI/CD pipelines (GitHub, GitLab) and IaC tools (Terraform, Ansible).
Monitor and optimise services using tools like Splunk, StackDriver, Datadog, or Grafana.
Mentor junior engineers and contribute to technical knowledge sharing.

Requirements

Technical Skills

5+ years of professional backend development experience, with deep hands-on expertise in Node.js asynchronous programming and non-blocking I/O.
Proven track record of delivering production microservices.
Solid understanding of cloud-native architectures and containerisation.
Familiarity with DevOps pipelines, IaC, and monitoring tools.
Strong database skills (SQL & NoSQL).

Soft Skills

Clear communicator, able to engage both technical and non-technical stakeholders.
Pragmatic approach to problem-solving and mentoring.
Proactive in troubleshooting and root cause analysis.
Comfortable navigating ambiguity and fast-changing requirements.

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Location:: London, England, United Kingdom
Salary:: £125,000 - £150,000
Category:: IT & Technology

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