Salary: £50,000 - 75,000 per year Requirements: Proven experience in a technical leadership role Strong expertise in MongoDB (data modelling, indexing, aggregation, performance tuning) Proficiency in Node.js and the wider JavaScript/TypeScript ecosystem Familiarity with Express.js and/or Fastify Experience in RESTful API design Knowledge of AWS or similar cloud platforms Understanding of microservices architecture Experience with testing frameworks (Vitest, Jest, Mocha, etc.) Familiarity with CI/CD pipelines and DevOps practices Proficient with GitHub workflows Knowledge of observability tools (e.g., DataDog) Experience with Docker/Kubernetes Nice to have: Experience integrating AI/ML models Nice to have: Experience working with LLM APIs Nice to have: Experience in prompt engineering Nice to have: Familiarity with AI workflow tools (LangChain, Flowise) Nice to have: Experience building internal AI automation tools Responsibilities: Set the technical direction and lead architectural decision-making Mentor and support junior and senior engineers Conduct code reviews and uphold engineering best practices Build and maintain scalable backend services and RESTful APIs Design and optimize MongoDB database solutions Improve and maintain existing backend infrastructure Troubleshoot production issues and implement robust solutions Work closely with cross-functional teams to deliver meaningful customer outcomes Participate in technical interviews and help grow the engineering team Drive improvements in processes, tooling, and development practices Technologies: AI API AWS Backend CI/CD Cloud Datadog DevOps Docker GitHub Support JavaScript Jest Kubernetes LLM Mocha MongoDB TypeScript microservices NodeJS ExpressJS Vue More: We are a forward-thinking tech company committed to shaping the future of our products. As a Lead Software Engineer, you will enjoy a remote-first working environment with a presence in London and Manchester. We value work-life balance, offering flexible hours, 25 days of annual leave plus 8 bank holidays and 2 additional Christmas shutdown days. You also have the option to purchase an extra week off. Join our talented team of engineers where your contributions will directly impact thousands of users. last updated 7 week of 2026