Full-Stack .NET Engineer for AI-Driven Modernization

Simon-; New York; Hybrid; USD 140,000 - 180,000; Full time

Job summary

Simon & Schuster US is modernizing core order management and fulfillment systems. As a Full-Stack .NET Developer, you will replace legacy COBOL batch programs with modern .NET services and T-SQL solutions, validate against the legacy system, and extend to web front ends.

You will leverage AI-assisted tooling for analysis, generation, and documentation, while applying rigorous review, testing, and production readiness to ensure reliability and performance in a fast-paced publishing environment in

Qualifications

• 5+ years of professional full-stack .NET development — C#, .NET (modern .NET 6+ preferred), building and operating production services.
• Experience using AI tools to assist development — e.g., AI-assisted code generation, code review, test generation, or documentation — with the judgment to critically validate generated output before it ships.
• Strong SQL Server / T-SQL skills — stored procedures, set-based logic, transactions, and query-performance fundamentals.
• Back-end service experience — background/worker services, scheduled or batch processing, structured logging, and configuration management.
• Production mindset — experience owning code that runs unattended in production: error handling, restartability, observability, and safe deployment practices.
• Strong debugging and problem-solving skills, including reasoning about data-level differences between two systems.
• Clear written communication — design notes, code review feedback, and operational documentation.

Responsibilities

• Build modern replacements — Implement .NET worker services, APIs, and T-SQL stored procedures that replace legacy COBOL batch programs while preserving required business behavior.
• Review and refine AI-generated code — Use AI-assisted development for speed, then apply engineering judgment: correctness, edge cases, error handling, performance, and maintainability are yours to guarantee.
• Implement target architecture patterns — Apply the program's established patterns: structured logging and run telemetry, configuration-driven behavior, parallel-run ("shadow") support, restartability, and clean integration contracts.
• Support validation and cutover — Instrument every replacement for reconciliation against legacy output; work with the QA / Test Automation Engineer to drive each package to a clean validation gate before production cutover.
• Resolve complex conversion issues — Debug behavioral differences between legacy and modern implementations, working with legacy specialists to understand what the original code actually does.
• Contribute to engineering standards — Capture lessons learned, improve shared frameworks and templates, and help raise the quality bar as the team scales.

Skills

Full-stack .NET development

AI tools for development

SQL Server / T-SQL

Back-end services

Production mindset

Debugging & problem solving

Clear written communication

Tools

Entity Framework Core

Dapper

AutoSys

Batch scheduling

Job description

Simon & Schuster US is modernizing core order management and fulfillment systems. As a Full-Stack .NET Developer, you will replace legacy COBOL batch programs with modern .NET services and T-SQL solutions, validate against the legacy system, and extend to web front ends.

You will leverage AI-assisted tooling for analysis, generation, and documentation, while applying rigorous review, testing, and production readiness to ensure reliability and performance in a fast-paced publishing environment in