[Remote] Principal Software Engineer, Architecture - Platform Modernization

Note: The job is a remote job and is open to candidates in USA. isolved is a leading provider of human capital management (HCM) solutions. The Principal Software Engineer will focus on decomposing a large HCM monolith into modern microservices and designing scalable API architectures to support integration.

Responsibilities

• Designing and implementing modern, scalable API architectures that support isolved's integration ecosystem and partner network
• Defining API contracts, versioning strategies, and governance standards that ensure consistency and reliability across the platform
• Driving the migration of legacy integration endpoints to modern RESTful and event-driven patterns as part of the integration modernization initiative
• Building API consumers and producers with a strong focus on performance, security, and backward compatibility, and elevating the team's practices through code reviews, pairing, and leading by example
• Performing code reviews to ensure API implementations meet quality standards and follow established patterns
• Collaborating with product management and partner-facing teams to understand integration requirements and translate them into technical specifications
• Identifying and resolving performance bottlenecks in API infrastructure, including latency, throughput, and reliability issues
• Establishing and documenting best practices for API development, testing, and monitoring across the engineering organization
• Using AI-assisted development tools - including agentic coding, spec-driven development, and AI-augmented code review - as a core part of your daily workflow to maximize velocity and code quality, and helping establish AI-augmented development practices across the team

Skills

• 7+ years of experience developing web applications and services, including 3+ years in cloud-native environments
• Proficiency in Azure, .NET/C#, ASP.NET Core Web APIs, and SQL Server
• Strong experience designing and building microservices and RESTful APIs
• Hands-on experience with API gateways and API management best practices
• Demonstrated use of AI-assisted development tools in professional workflows
• Solid understanding of unit testing, SOLID principles, and secure API design (OAuth 2.0)
• Familiarity with JavaScript and OpenAPI/Swagger documentation standards
• Experience with Azure API Management, Cosmos DB/NoSQL, messaging systems (Service Bus/Event Grid), containers, or large-scale systems
• Experience in HCM/payroll domains and familiarity with Azure services (Dapr, Service Bus, Container Apps, API Management) and CDC tools like Debezium

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