Principal Software Engineer (ASP.NET WebForms)

isolved; Hyderabad; On-site; INR 2,600,000 - 4,800,000; Full time

Job summary

isolved HCM is seeking a Principal Software Engineer to drive visual modernization of an existing C#/.NET WebForms application within the Suite Experience initiative. You will deliver modern, responsive, accessible interfaces while preserving live system behavior and integrating with evolving services architecture.

The role blends hands-on coding with architecture thinking, with AI-assisted tools to accelerate development.

Qualifications

• 7+ years developing web applications.
• 3+ years developing cloud-native applications.
• Demonstrated use of AI-assisted development tools as part of professional development workflows.
• Demonstrated ability to ramp quickly on unfamiliar legacy codebases.

Responsibilities

• Refreshing and elevating the interface within a C# and ASP.NET WebForms application, preserving behavior while modernizing look and feel.
• Building modern, responsive UI improvements with focus on performance and consistency.
• Establishing front-end quality across the team: component structure, CSS, state management, performance.
• Performing code reviews to ensure UI quality and patterns.
• Collaborating with product management and UX to translate goals into scalable solutions.
• Identifying and resolving UI performance bottlenecks and integrating with backend services via RESTful APIs.
• Leading by example with modern front-end practices and AI-augmented code review.

Skills

C# & ASP.NET

WebForms lifecycle

UI architecture

JavaScript/TypeScript

Performance optimization

RESTful APIs

Azure

Tools

GitHub Copilot

AI-assisted development

Job description

Why Work Here

• Headquarters is in Charlotte, NC
• Recently expanded to nearshore
• isolved ranked for SMB Payroll in 2023 Sapient Report
• Voted top places to work in USA 2023

Job Description

Summary/objective

The Principal Software Engineer on this Experience team drives the visual modernization of an established application built on C# and ASP.NET WebForms, as part of isolved's Suite Experience initiative. This is a hands-on senior development role focused on refreshing and elevating the user interface of a live product: modern, responsive, and accessible interfaces delivered within the application's existing technology stack. This is a visual modernization effort, not a ground-up rewrite. You will improve the experience of a running application where it lives, which means you pair strong, transferable front-end engineering fundamentals with real depth in the application's stack.

This role requires strong architecture thinking, but the day-to-day is hands-on coding, not high-level design from a distance. The expectation is that you design solutions and then implement them yourself. Our modernization strategy is built on hiring fewer, highly senior engineers who use AI-assisted development as a force multiplier, and we expect you to leverage agentic coding, spec-driven development, and AI-augmented code review as a core part of how you work, including to ramp quickly on an unfamiliar codebase. You will partner closely with product management and UX to translate experience goals into performant, consistent, and maintainable interfaces, and you will integrate cleanly with isolved's evolving service architecture.

Core Job Duties

• Refreshing and elevating the interface within a C# and ASP.NET WebForms application, working within the server-side page lifecycle to modernize the look and feel while preserving existing behavior
• Building modern, responsive, and accessible UI improvements with a focus on performance and consistency
• Establishing and elevating front-end quality across the team, including component structure, CSS architecture, state management, and performance
• Performing code reviews to ensure front-end implementations meet quality standards and follow established patterns
• Collaborating with product management and UX design to translate experience goals into scalable technical solutions
• Identifying and resolving performance bottlenecks in the UI layer, including load times, rendering performance, and client-side resource management
• Integrating cleanly with backend services through RESTful APIs
• Raising the bar on modern front-end development practices across the team through code reviews, pairing, and leading by example
• 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 to ramp quickly on unfamiliar legacy code

Minimum Qualifications

• 7+ years developing web applications

  • 3+ years developing cloud-native applications
  • Demonstrated use of AI-assisted development tools (GitHub Copilot, Claude Code, Cursor, or similar) as part of professional development workflows
  • Demonstrated ability to ramp quickly on unfamiliar legacy codebases. Be prepared to walk through a specific example
  • Ability to work independently to research and solve complex problems

Strong skills in:

• C# and ASP.NET with real WebForms lifecycle depth, including ViewState, postbacks, and server controls
• Component-driven UI architecture
• Modern JavaScript and TypeScript
• CSS architecture
• Responsive and accessible web design
• State management patterns
• Front-end performance

Experience with:

• RESTful API consumption and clean backend integration
• Azure
• SOLID principles
• Unit and integration testing for front-end applications

Experience with the following a plus:

• Experience modernizing WebForms interfaces toward modern patterns
• Design system integration and component libraries
• Accessibility standards (WCAG 2.1)
• Performance profiling and optimization tools

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.