C#/.NET Developer

Algoworks; Pittsburgh (Allegheny County); On-site; USD 110,000 - 170,000; Full time

Job summary

Algoworks is seeking an experienced Senior C#/.NET Developer to implement, test, troubleshoot, and improve scalable enterprise applications. You will work across APIs, microservices, background processing, messaging, databases, and legacy .NET components.

This hands-on role emphasizes production code delivery, automated tests, and performance improvements within an established technical direction. You will contribute to code reviews, estimation, and production validation.

Qualifications

• 7+ years of professional software‑development experience with strong, current hands‑on C#/.NET skills.
• Modern .NET stack including ASP.NET Core, Web API, DI, middleware, configuration, LINQ, and serialization.
• Experience with microservices, distributed applications, or high‑volume service‑based systems.
• Strong asynchronous and concurrent programming skills (async/await, cancellation, thread safety, bounded concurrency).
• Experience with messaging technologies (Azure Service Bus, Kafka, RabbitMQ, Event Hubs).
• SQL Server proficiency including complex queries, transactions, indexing, and performance tuning.
• Entity Framework Core or Dapper or similar data‑access tech.
• Strong debugging, profiling, and production‑support capabilities.

Responsibilities

• Implement production features and defects using C# and modern .NET.
• Build and maintain REST APIs, microservice components, background workers, and message consumers.
• Write clean, maintainable, and performant code per designs and acceptance criteria.
• Deliver automated unit tests across all layers for each change.
• Implement asynchronous processing, retries, timeouts, and recovery workflows.
• Troubleshoot production issues across code, SQL Server, messaging, APIs, and integrations.
• Profile and optimize CPU, memory, and database access; improve testability and maintainability.
• Add logging, metrics, tracing, and diagnostics; participate in code reviews and production validation.

Skills

C#/.NET

ASP.NET Core

Web API

Microservices

SQL Server

Entity Framework Core

Async programming

Messaging (Azure Service Bus, Kafka,_R

Tools

xUnit

NUnit

MSTest

Docker

Kubernetes

CI/CD pipelines

OpenTelemetry

Job description

Senior C#/.NET Developer Hands-On Implementation | Cloud Applications | Microservices | High-Volume Processing

About the Role

Role focus: A hands‑on individual‑contributor role focused on writing production code, automated tests, performance improvements, and reliable software within an established technical direction. We are seeking an experienced C#/.NET developer to implement, test, troubleshoot, and improve scalable enterprise applications. The developer will work across APIs, microservices, background processing, messaging, databases, and legacy .NET components. This is an implementation role rather than an architecture or infrastructure ownership position.

Responsibilities

• Implement production features, enhancements, and defect fixes using C# and modern .NET.
• Build and maintain REST APIs, microservice components, application services, background workers, schedulers, and message consumers.
• Write clean, maintainable, and performant code based on established designs and acceptance criteria.
• Deliver automated unit-test code with every 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 across 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.
• Refactor legacy .NET code incrementally 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.

Qualifications

• 7+ years of professional software‑development experience with strong, current, hands‑on C#/.NET skills.
• Modern .NET, ASP.NET Core, Web API, dependency injection, middleware, configuration, LINQ, and serialization.
• Implementation experience with 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.
• Messaging technologies such as Azure Service Bus, Kafka, RabbitMQ, Event Hubs, or equivalent.
• SQL Server, including complex queries, transactions, stored procedures, indexes, performance tuning, locking, and connection pooling.
• Entity Framework Core, Dapper, or a comparable .NET data‑access technology.
• Strong debugging, profiling, root‑cause analysis, and production‑support capabilities.
• Experience working effectively in large, interconnected, or legacy codebases.

Required Skills

• Automated test code is a required part of every development deliverable.
• Each change must include appropriate tests for every affected layer, not only controller or service‑level coverage.
• Write unit tests for API, application, business/domain, data‑access, messaging, background‑processing, transformation, adapter, and error‑handling layers as applicable.
• Cover positive, negative, boundary, exception, timeout, cancellation, retry, and recovery scenarios.
• Add regression tests for defect fixes and update existing tests when behavior intentionally changes.
• Use xUnit, NUnit, MSTest, or an equivalent framework; apply mocks and test doubles appropriately.
• Provide integration or contract tests where a boundary cannot be validated adequately through unit tests.
• Keep tests deterministic, isolated, readable, repeatable, and maintainable.

Preferred Skills

• Microsoft Azure application development and managed cloud services.
• Modernization of .NET Framework, WCF, IIS‑hosted applications, or Windows services.
• SignalR/WebSockets, Redis, OpenTelemetry, Application Insights, or Serilog.
• Docker, Kubernetes, CI/CD pipelines, and infrastructure‑as‑code familiarity; infrastructure ownership is not required.
• XML, JSON, CSV, file processing, ERP integrations, or EDI/B2B transaction processing.

Expected output: Consistently delivers production‑ready C#/.NET implementation with meaningful automated tests at every affected layer. Works independently within established architecture and technical direction. Improves throughput, latency, stability, diagnosability, and maintainability through practical code changes. Owns assigned work through implementation, testing, code review, troubleshooting, and production validation.

Hourly rate: $50-$60pr hr

US Citizens/GC Holders Encouraged to Apply

We do not offer sponsorship for this role