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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior .NET Software Engineer - **Company:** Business Insurance Solutions Ltd - **Location:** London, UK - **Experience:** Expert - **Salary:** £75,000.0 - £80,000.0 - **Contract:** Permanent contract - **Skills:** ASP.NET, .NET Framework, Multitier Architecture, Agile Methodology, Amazon Web Services, Amazon Elastic Compute Cloud, Amazon S3, Acceptance Test-Driven Development, Unit Testing, C Sharp (Programming Language), Cloud Computing, Code Review, Continuous Integration, Data Integrity, DevOps, Github, Hypertext Transfer Protocols (HTTP), JSON, PostgreSQL, Message Broker, Microsoft SQL Server, Octopus Deploy, Performance Tuning, Software Maintenance, Standard Sql, SQL Stored Procedures, Transact-SQL, Extensible Markup Language (XML), Enterprise Software Applications, .NET Core, Grafana, Event Driven Architecture, Containerization, Git Flow, Integration Tests, Solid Principles, Kubernetes, Deployment Automation, Teamcity, Cloudwatch, Code Restructuring, Software Version Control, Docker, Elk Stack, Legacy Systems, Web Api, Microservices - **Published:** October 2, 2026 - **Apply:** https://www.adzuna.co.uk/jobs/details/5905466194 ## About the Role * Strong experience with C# and .NET, including migration to modern .NET Core/.NET versions, and building systems such as web APIs and background services using technologies such as HTTP, JSON, XML and message brokers. * Proficiency in SQL Server (T-SQL) and PostgreSQL - schema design, stored procedures, performance optimization. * Familiarity with cloud-based development and deployment, ideally in AWS (EC2, RDS, Lambda, S3, etc.). * Experience with CI/CD pipelines and automated deployments using TeamCity and Octopus Deploy (or equivalent services). * Version control expertise with GitHub (branching strategies, pull requests, code reviews). * Ability to develop integration and unit tests with tools such as xUnit, and knowledge of when to use either type of test. * Good understanding of software design principles (SOLID, clean architecture, layered design). * Proven ability to work with legacy systems and progressively modernize them. * Knowledge of containerization (Docker, ECS, or Kubernetes in AWS) - desirable. * Familiarity with microservices and event-driven architectures - desirable. * Experience with monitoring and logging solutions (e.g., CloudWatch, ELK stack, Grafana) - desirable. * Exposure to Agile methodologies and DevOps practices - desirable. * Comfortable working with both legacy and modern technologies. * Good written and verbal skills with the ability to clearly document and explain business processes and solution designs. * Able to work well in a small team either with peers or mentoring less experienced colleagues. * Proactive in identifying improvements to codebases, processes, and systems. * Detail-oriented with a focus on writing reliable and maintainable software., We are seeking a skilled .NET engineer to modernize and support our portfolio of legacy applications and services. Many of our existing systems are built on older, unsupported .NET versions, and you will play a key role in refactoring and/or re-architecting and future-proofing them for long-term stability. This is a hands-on role that requires strong problem-solving skills, a solid understanding of enterprise application design, and experience working across the full development lifecycle. Working alongside colleagues in both the UK and India, you will be part of a team that collaborates closely with the commercial side of the business. If you enjoy building systems using the .NET platform, with a focus on delivering quality software whilst continuing to learn and improve with colleagues, then this is an excellent opportunity to further your career. The salary range for this position is £75,000 - £80,000 per year. ## Description * Upgrade, refactor, and modernize legacy .NET applications, web APIs and services to supported frameworks (.NET 6/8/10). * Analyse existing codebases to identify risks, dependencies, and opportunities for improvement. * Collaborate with stakeholders to understand business needs and translate them into technical solutions. * Work with both SQL Server (MSSQL) and PostgreSQL databases, ensuring data integrity and performance tuning. * Integrate with and deploy to AWS cloud services, leveraging best practices in scalability, security, and reliability. * Use GitHub for version control and collaborative development workflows (PRs, code reviews). * Build, release, and deploy applications via TeamCity and Octopus Deploy. * Write clean, maintainable, and well-documented code with appropriate unit or integration tests, in a test-driven manner where appropriate. * Maintain and enhance our monitoring and alerting systems to ensure rapid response to production incidents. * Provide ongoing support and troubleshooting for applications, ensuring minimal downtime and performance issues. Technologies: * AWS * Lambda * C# * CI/CD * Cloud * CloudWatch * DevOps * Docker * EC2 * ELK * GitHub * Grafana * HTTP * Support * JSON * Kubernetes * LESS * PostgreSQL * SQL * Security * Teamcity * Web * XML * microservices * ASP.NET ## Related Videos - [Tips and Tricks for Working with JSON](https://www.wearedevelopers.com/videos/1229-tips-and-tricks-for-working-with-json) - [Innovating Developer Tools with AI: Insights from GitHub Next](https://www.wearedevelopers.com/videos/1268-innovating-developer-tools-with-ai-insights-from-github-next) - [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered) - [Migrating half a million users to a new payment service provider](https://www.wearedevelopers.com/videos/730-migrating-half-a-million-users-to-a-new-payment-service-provider) - [Introducing JSON Structure](https://www.wearedevelopers.com/videos/100219-introducing-json-structure) - [Navigating the Corporate Jungle: Life as a Developer in a large Company](https://www.wearedevelopers.com/videos/621-navigating-the-corporate-jungle-life-as-a-developer-in-a-large-company) ## Related Articles - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london) - [Software Engineer Salary in The UK](https://www.wearedevelopers.com/magazine/231-software-engineer-salary-in-the-uk) - [Fullstack Developer Salary UK](https://www.wearedevelopers.com/magazine/251-fullstack-developer-salary-uk) - [Data Engineer Salary UK](https://www.wearedevelopers.com/magazine/253-data-engineer-salary-uk) - [Frontend Developer Salary in The UK](https://www.wearedevelopers.com/magazine/233-frontend-developer-salary-in-the-uk) - [The 12 Best Jobs for Software Engineers](https://www.wearedevelopers.com/magazine/401-the-12-best-jobs-for-software-engineers)