Principal Software Engineer

Why Work Here

• Headquarters is in Charlotte, NC


• Recently expanded to Hyderabad


• isolved ranked for SMB Payroll in 2023 Sapient Report


• Voted top places to work in USA 2023

Job Description

The Principal Software Engineer for the API team is a hands-on technical leader responsible for designing, building, and evolving isolved's API layer as part of a broader platform modernization initiative. Embedded within the Integrations workstream, this role focuses on developing scalable, secure, and well-governed APIs that support external partners, third-party integrations, and internal services. The position combines architecture and execution, requiring direct ownership of API design, implementation, and migration from legacy systems to modern RESTful and event-driven patterns. Leveraging AI-assisted development as a core practice, the architect drives standards for API contracts, versioning, and governance while ensuring high performance, reliability, and alignment with enterprise growth needs.

Core Job Duties

• 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 reliablity across the platform


• Driving the migration of legacy interaction 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

Minimum Qualifications

• 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


• Preferred:
  
  
  
  • Experience with Azure API Management, Cosmos DB/NoSQL, messaging systems (Service Bus/Event Grid), containers, or large-scale systems
  
  
  
  

About isolved

isolved is an employee experience leader, providing intuitive, people-first HCM (Human Capital Management) technology. Our solutions are delivered directly or through our partner network to more than five million employees and 145,000 employers - who use them every day to boost performance, increase productivity, and accelerate results while reducing risk. Our HCM platform, isolved People Cloud, seamlessly connects and manages the employee journey across talent management, HR & payroll, workforce management and engagement management functions. No matter the industry, we help high-growth organizations employ, enable and empower their workforce by transforming employee experience for a better today and a better tomorrow. For more information, visit www.isolvedhcm.com.

EEO Statement

isolved is an equal opportunity employer. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran or disability status. isolved is a progressive and open-minded meritocracy. If you are smart and good at what you do, come as you are.

Disability Accommodation

Visit www.isolvedhcm.com/careers for more information regarding our incredible culture and focus on our employee experience. Visit www.isolvedeebenefits.com for a comprehensive list of our employee total rewards offerings.

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities, and activities may change at any time with or without notice. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions outlined above.