Senior C# Architect

About the Role:

We're looking for a Senior C# Architect to own the technical architecture of our core platform, spanning legacy ASP.NET MVC/Web API services and modern cloud-native systems. You'll balance hands-on coding with high-level design, guide a team of engineers, and drive decisions on scalability, performance, and modernization including migration paths from .NET Framework to .NET 8+.

Key Responsibilities :

- Own end-to-end architecture for ASP.NET MVC and Web API applications, including API design, service boundaries, and data access patterns

- Lead technical design reviews and set coding/architecture standards across teams

- Drive cloud infrastructure decisions (AWS) compute, networking, storage, caching, and managed database services

- Identify and resolve performance bottlenecks in production systems (SQL Server, IIS, connection pooling, caching layers)

- Design and implement caching strategies (Redis/ElastiCache) to decouple read-heavy workloads from primary databases

- Guide migration strategy from ASP.NET Framework (4.x) to .NET Core/.NET 8+, including hosting model changes (IIS to containerized/cloud-native)

- Architect for high availability, disaster recovery, and horizontal scalability

- Mentor senior/mid-level engineers on system design and code quality

- Collaborate with product and infra teams to translate business requirements into scalable technical solutions

- Own technical documentation, RFCs, and architecture decision records (ADRs)

- Participate in incident response and root-cause analysis for critical production issues

Required Qualifications :

- Deep expertise in C#, ASP.NET MVC, ASP.NET Web API (both .NET Framework and .NET Core/.NET 8+)

- Strong background in RESTful API design, versioning, and security (OAuth2/JWT)

- Proven experience architecting solutions on AWS (EC2, RDS, ElastiCache, Lambda, S3) equivalents

- Solid SQL Server expertise: query optimization, indexing strategy, execution plan analysis, stored procedures

- Experience with distributed caching (Redis) and message queuing (SQS, RabbitMQ)

- Strong understanding of IIS configuration, application pools, and Windows Server hosting environments

- Experience with CI/CD pipelines, containerization (Docker), and infrastructure-as-code (Terraform/CloudFormation)

- Track record of leading legacy modernization/migration projects

- Excellent communication skills able to explain architecture tradeoffs to both engineers and business

stakeholders

Preferred Qualifications :

- Experience with microservices architecture and event-driven design

- Familiarity with Entity Framework/EF Core and ORM performance tuning

- Exposure to mobile backend architecture (APNs, push notification systems, mobile API design)

- Experience in health/wellness, fintech, or other regulated/data-sensitive industries

AWS/Azure architecture certification