C#/.NET Developer

Salary: $104,000 - 124,800 per year Requirements:

• 7+ years of professional software-development experience and strong, current hands-on C#/.NET skills.
• Experience with modern .NET, ASP.NET Core, Web API, dependency injection, middleware, configuration, LINQ, and serialization.
• Experience implementing microservices, distributed applications, or high-volume service-based systems.
• Strong asynchronous and concurrent programming skills, including async/await, cancellation, thread safety, bounded concurrency, and connection management.
• Familiarity with messaging technologies such as Azure Service Bus, Kafka, RabbitMQ, Event Hubs, or equivalents.
• SQL Server experience, including complex queries, transactions, stored procedures, indexes, performance tuning, locking, and connection pooling.
• Experience with Entity Framework Core, Dapper, or a comparable .NET data-access technology.
• Strong debugging, profiling, root-cause analysis, and production-support capabilities.
• Ability to work effectively in large, interconnected, or legacy codebases.
• Automated tests are required for every development deliverable, with suitable coverage for each affected layer.
• Ability to test applicable API, application, business/domain, data-access, messaging, background-processing, transformation, adapter, and error-handling layers.
• Ability to cover positive, negative, boundary, exception, timeout, cancellation, retry, and recovery scenarios; add regression tests for defect fixes and update tests when behavior changes intentionally.
• Experience using xUnit, NUnit, MSTest, or an equivalent framework, and applying mocks and test doubles appropriately.
• Ability to provide integration or contract tests where unit tests cannot adequately validate a boundary, and to keep tests deterministic, isolated, readable, repeatable, and maintainable.
• Preferred: Microsoft Azure application development and managed cloud services.
• Preferred: Modernization of .NET Framework, WCF, IIS-hosted applications, or Windows services.
• Preferred: SignalR/WebSockets, Redis, OpenTelemetry, Application Insights, or Serilog.
• Preferred: Familiarity with Docker, Kubernetes, CI/CD pipelines, and infrastructure as code; infrastructure ownership is not required.
• Preferred: XML, JSON, CSV, file processing, ERP integrations, or EDI/B2B transaction processing.
• U.S. citizens and Green Card holders are encouraged to apply; we do not offer sponsorship for this role.

• Implement production features, enhancements, and fixes using C# and modern .NET.
• Build and maintain REST APIs, microservice components, application services, background workers, schedulers, and message consumers.
• Write clean, maintainable, performant code guided by established designs and acceptance criteria.
• Deliver automated unit tests with each feature, defect fix, and refactoring change across all affected layers.
• Implement asynchronous processing, retries, idempotency, timeout handling, throttling, dead-letter handling, and recovery workflows.
• Troubleshoot production issues involving application code, SQL Server, messaging, APIs, file processing, and external integrations.
• Profile and optimize CPU, memory, concurrency, database access, serialization, network calls, and resource usage.
• Incrementally refactor legacy .NET code to improve testability, reliability, maintainability, and performance.
• Add structured logging, metrics, tracing, and useful diagnostics to implemented components.
• Participate in code reviews, estimation, technical discussions, and production validation.
• Work independently within established architecture and technical direction, taking assigned work through implementation, testing, review, troubleshooting, and production validation.
• Improve throughput, latency, stability, diagnosability, and maintainability through practical code changes.

• .NET Framework
• API
• ASP.NET
• Azure
• C#
• CI/CD
• Cloud
• Dapper
• Docker
• ERP
• Support
• JSON
• Kafka
• Kubernetes
• Network
• OpenTelemetry
• REST
• RabbitMQ
• Redis
• SQL
• SignalR
• Web
• Windows
• XML
• microservices

More:

We are seeking an experienced C#/.NET developer for a hands-on, individual-contributor contract role focused on implementation, automated testing, performance improvements, and reliable software within an established technical direction. The work spans APIs, microservices, background processing, messaging, databases, and legacy .NET components; this is not an architecture or infrastructure ownership position. The contract is expected to last 6–12+ months, with an hourly rate of $50–$60.

last updated 41 week of 2026