Top Tech Jobs & Startup Jobs in London

Design, execute and maintain automated and manual tests (functional, regression, integration, exploratory). Investigate and document defects, support test automation frameworks and CI/CD pipelines, and collaborate with developers and product teams to embed quality across agile delivery.

Develop, test, deploy and maintain secure, scalable backend services and APIs in an Agile environment. Follow secure SDLC and DevOps practices; senior engineers provide architecture direction, lead technical initiatives, mentor engineers, and support high-volume production systems.

Design, build, and maintain responsive, accessible, high-performance web applications; create reusable components and frontend architectures; collaborate with designers and product teams; participate in code reviews, CI/CD, and agile delivery. Senior engineers provide technical leadership, mentoring, standards, and architecture guidance across teams.

Design and build application-level AI features: implement RAG pipelines, prompt templates, retrieval strategies, and agentic workflows; integrate LLM-based functionality with legacy and multi-cloud systems; run structured evaluations, apply human-in-the-loop guardrails, and produce docs-as-code for handover to government engineers.

Build and maintain scalable full‑stack, cloud‑native applications and microservices. Develop REST APIs with Node.js/Express, responsive Angular frontends, automated tests (Jest), and CI/CD (GitLab). Support containerisation, serverless AWS services, Terraform IAC, performance tuning, and collaborate in Agile multidisciplinary teams.

Lead QA and test strategy for an AWS-native big data platform. Define automated test frameworks, validate large-scale data pipelines (PySpark/EMR), integrate tests into GitLab CI/CD, manage risk and reporting, mentor QA teams, and ensure data integrity across cloud data lake workflows.

Hands-on Lead AI Engineer to design, build, and operate production-grade RAG, semantic search, embedding, and LLM orchestration systems in a UK government programme. Mentor engineers, implement Responsible AI guardrails, ensure security/observability, and enable capability transfer using Docs-as-Code and iterative delivery.

Design and execute test strategies and automated UI/API tests for React/Node.js cloud-native applications on AWS. Create test plans, maintain WireMock stubs, validate integrations (ETL, RPA), ensure accessibility (WCAG 2.2 AAA), manage defects in JIRA, and collaborate within Agile teams to deliver reliable, scalable services.

Design, build, and maintain scalable full-stack applications and microservices using Node.js/Express and Angular. Develop secure REST APIs, implement Jest automated tests, contribute to GitLab CI/CD pipelines, support cloud-native/containerised and serverless deployments on AWS, participate in Agile teams, perform code reviews, and optimise application performance and reliability.

Design, deploy, and operate AWS infrastructure and CI/CD pipelines for multi-environment digital services. Manage networking (Transit Gateway, PrivateLink), IAM/MFA, Kong API Gateway, serverless and microservice architectures, Kafka integrations, and FinOps tagging. Troubleshoot deployments, improve automation, support accessibility standards, and collaborate within Agile teams.