Full Stack Developer - London Market Insurance We are supporting a global speciality insurer on the hire of a Senior Full Stack Developer to join a critical technology programme focused on modernising a legacy platform while delivering new cloud-native services.This is a hands-on engineering role, working across both legacy systems and modern cloud architecture in a highly collaborative, agile environment.Key ResponsibilitiesMaintain and enhance existing legacy applications, including refactoring where requiredDesign, build and support backend services and API integrationsTroubleshoot complex, end-to-end production issuesDevelop and optimise SQL / T-SQL queries and database structuresBuild and deploy cloud-native services across Azure and/or AWSImplement secure authentication and integration patterns (REST / SOAP)Support CI/CD pipelines and contribute to DevOps best practicesCollaborate with QA, DevOps, and business stakeholders to deliver incremental improvementsStrong experience with C#, .NET Core and backend service developmentStrong Python experienceSolid understanding of Exposure Management principles Solid SQL / T-SQL skills including performance optimisationFrontend experience with JavaScript, HTML, CSS (jQuery desirable)Hands-on experience building and deploying applications in Azure or AWSExperience with serverless technologies (e.g. Azure Functions, AWS Lambda)Strong understanding of API development and integration patternsExperience troubleshooting production systems in a live environmentDesirable ExperienceExposure to event-driven architecture (queues, messaging systems)Familiarity with observability tools (e.g. Application Insights, Datadog)Understanding of security concepts such as OAuth2 and JWTExperience working in agile delivery environmentsInitial 6-month contract with strong likelihood of extensionHybrid working arrangementCompetitive day rateThis role would suit an experienced engineer who enjoys working across both legacy and modern systems, and is comfortable taking ownership of complex technical challenges in a live environment. We are supporting a global speciality insurer on the hire of a Senior Full Stack Developer to join a critical technology programme focused on modernising a legacy platform while delivering new cloud-native services.This is a hands-on engineering role, working across both legacy systems and modern cloud architecture in a highly collaborative, agile environment.Key ResponsibilitiesMaintain and enhance existing legacy applications, including refactoring where requiredDesign, build and support backend services and API integrationsTroubleshoot complex, end-to-end production issuesDevelop and optimise SQL / T-SQL queries and database structuresBuild and deploy cloud-native services across Azure and/or AWSImplement secure authentication and integration patterns (REST / SOAP)Support CI/CD pipelines and contribute to DevOps best practicesCollaborate with QA, DevOps, and business stakeholders to deliver incremental improvements Strong experience with C#, .NET Core and backend service developmentStrong Python experienceSolid understanding of Exposure Management principles Solid SQL / T-SQL skills including performance optimisationFrontend experience with JavaScript, HTML, CSS (jQuery desirable)Hands-on experience building and deploying applications in Azure or AWSExperience with serverless technologies (e.g. Azure Functions, AWS Lambda)Strong understanding of API development and integration patternsExperience troubleshooting production systems in a live environmentDesirable ExperienceExposure to event-driven architecture (queues, messaging systems)Familiarity with observability tools (e.g. Application Insights, Datadog)Understanding of security concepts such as OAuth2 and JWTExperience working in agile delivery environments