Senior Full Stack .Net Developer

Join Starr, a global leader in commercial insurance with over a century of expertise. We empower our employees to innovate, make impactful decisions, and build lasting client relationships worldwide. At Starr, you'll work in an entrepreneurial culture alongside accessible leaders, leveraging our financial strength and vast industry experience to deliver solutions for our clients, no matter how complex. Grow your career with a rapidly growing company that invests in its people and their ability to drive real progress.

Senior Full Stack .NET Developer

We are seeking a highly experienced Senior Full Stack .NET Developer to design, build, enhance, and support secure, scalable, cloud-native business applications. This role will work across the full software delivery lifecycle—from architecture and technical design through implementation, deployment, monitoring, and ongoing optimization.

The ideal candidate is an experienced hands-on engineer with deep expertise in modern .NET/C#, Angular, Azure, SQL Server, and enterprise application architecture. You will help establish technical standards, mentor other developers, and partner closely with product owners, business stakeholders, QA, DevOps, and security teams.

Responsibilities

• Design, develop, test, deploy, and maintain modern web applications using .NET, C#, Angular, SQL Server, and Microsoft Azure.
• Build and maintain RESTful APIs, backend services, integration layers, and user-facing Angular applications.
• Apply secure coding practices, authentication and authorization patterns, and enterprise security standards throughout the application stack.
• Design efficient data models, database schemas, queries, and performance-tuning strategies for SQL Server.
• Troubleshoot complex production issues involving application code, database performance, cloud infrastructure, integrations, and deployment processes.

Required Qualifications

Modern .NET and C#

• Extensive professional experience developing enterprise applications using recent versions of .NET and C#.
• Strong understanding of object-oriented design, SOLID principles, dependency injection, asynchronous programming, exception handling, logging, and performance optimization.
• Experience building and maintaining ASP.NET Core web APIs, background services, worker processes, and service-oriented applications.
• Experience designing API contracts, versioning APIs, implementing validation, handling errors consistently, and securing endpoints.
• Strong knowledge of authentication and authorization approaches such as OAuth 2.0, OpenID Connect, JWT, role-based access control, and claims-based authorization.
• Experience with unit testing, integration testing, mocking frameworks, and testable application architecture.

Entity Framework Core

• Strong experience using Entity Framework Core for database access, migrations, data modeling, and repository/service-layer patterns.
• Ability to diagnose and improve EF Core performance issues, including inefficient queries, excessive database round trips, tracking behavior, eager versus lazy loading, and query projections.
• Strong understanding of transactional behavior, concurrency handling, data integrity, and error recovery.

Angular Front-End Development

• Extensive experience building single-page applications with recent versions of Angular and TypeScript.
• Strong knowledge of Angular components, services, dependency injection, routing, forms, HTTP clients, RxJS, observables, signals, stores, state management, and reusable UI patterns.
• Experience developing responsive, accessible, and performant web interfaces using HTML, CSS/SCSS, and modern UI component libraries.
• Familiarity with Angular testing practices, including unit tests and end-to-end testing.

Azure Cloud Development

• Strong hands-on experience designing, deploying, and supporting applications in Microsoft Azure.
• Experience with Azure App Service, Azure Functions, Azure SQL Database, Azure Storage, Azure Key Vault, Application Insights, Azure Monitor, and Azure API Management or equivalent services.
• Experience implementing cloud-native patterns such as managed identities, configuration management, secret management, background processing, event-driven workflows, and scalable deployment architectures.
• Ability to diagnose application, infrastructure, networking, identity, and configuration issues in Azure environments.
• Experience with Infrastructure as Code using tools such as Bicep, ARM templates, Terraform, or similar technologies.
• Familiarity with cost optimization, availability, resiliency, disaster recovery, and security best practices in Azure.

SQL Server Database Development

• Strong experience designing, developing, and optimizing Microsoft SQL Server databases.
• Advanced SQL skills, including complex queries, joins, common table expressions, window functions, stored procedures, views, functions, and transactions.
• Experience with schema design, normalization, indexing strategies, execution plan analysis, query tuning, and database performance troubleshooting.
• Understanding of database security, permissions, auditing, backup/recovery concepts, and data-retention considerations.
• Experience supporting database deployments and coordinating schema changes across development, test, staging, and production environments.
• Familiarity with Azure SQL Database and the differences between cloud-managed and self-hosted SQL Server environments.

AI-Assisted Development

• Strong experience using AI-assisted development tools to improve productivity, code quality, documentation, testing, and analysis.
• Ability to use tools such as GitHub Copilot or comparable developer-assistance platforms responsibly and effectively.
• Ability to identify practical opportunities for AI to assist with code generation, refactoring, test creation, documentation, troubleshooting, and developer workflows.

Additional Preferred Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, Information Systems, or equivalent practical experience.
• 8+ years of professional software development experience, including significant experience in senior or technical leadership roles.
• Experience with Agile delivery methodologies, including Scrum or Kanban.
• Experience with Git-based source control, pull requests, branching strategies, and code-review practices.
• Experience building CI/CD pipelines using Azure DevOps, GitHub Actions, or similar platforms.
• Familiarity with Docker, containerized workloads, Kubernetes, or Azure Kubernetes Service is preferred.
• Experience with caching technologies such as Redis.
• Experience working in regulated, security-conscious, or high-availability enterprise environments is a plus.
• Strong written and verbal communication skills, including the ability to explain complex technical concepts to both technical and non-technical stakeholders.

Starr is an equal opportunity employer, which means we'll consider all suitably qualified applicants regardless of gender identity or expression, ethnic origin, nationality, religion or beliefs, age, sexual orientation, disability status or any other protected characteristic. We recruit and develop our people based on merit and we're committed to creating an inclusive environment for all employees. We offer first class training and development opportunities to all employees. Our aim is to grow our own talent and bring out the best in people.