Senior Software Engineer – Fullstack

Color Employer, LLC; Pennsylvania; Hybrid; USD 125,241 - 187,862; Full time

Job summary

Lyric is seeking an experienced software engineer to modernize a legacy .NET + SQL Server stack and deliver reliable software in a fast-moving, cross-functional team. You will leverage AI coding tools daily to perform multi-file refactors, migrations, and test generation, ensuring security, observability, and robust CI guardrails.

The role emphasizes independent and collaborative work in a dynamic environment with strong emphasis on scalable architecture and concrete, testable outcomes.

Qualifications

• 5+ years building and shipping production systems in real user environments.
• Strong C# and modern .NET (Core and beyond) experience in large codebases with refactor and migration work.
• Expertise in SQL Server: schema design, query performance tuning, and transactional correctness.
• Experience with Azure and/or AWS; Azure is especially relevant.
• API design and versioned service-oriented architecture experience, including auth, reliability, and testing.
• Daily use of AI coding tools such as Cursor, Claude Code, Codex, or similar for multi-file refactors, migrations, test generation, and review workflows.

Responsibilities

• Use AI agents to accelerate framework upgrades, refactors, API extractions, test scaffolding, and documentation while preventing regressions.
• Build reusable playbooks, prompt templates, and migration checklists for AI-assisted work.
• Modernize a legacy .NET + SQL Server stack to contemporary, maintainable, and scalable technology.
• Ensure security, privacy, and observability in all code, setting strong automated tests and CI guardrails.
• Collaborate with analysts, stakeholders, and engineers to translate business problems into reliable software.

Skills

C# / .NET

SQL Server

Azure / AWS

API design

AI coding tools

Team collaboration

Tools

Cursor

Claude Code

Codex

Job description

Job Responsibilities

• Use AI agents (Cursor, Claude Code, Codex) to accelerate framework upgrades, refactors, API extractions, test scaffolding, and documentation while preventing regressions.
• Build reusable playbooks, prompt templates, and migration checklists for AI-assisted work.
• Modernize a legacy .NET + SQL Server stack to contemporary, maintainable, and scalable technology.
• Ensure security, privacy, and observability in all code, setting strong automated tests and CI guardrails.
• Collaborate with analysts, stakeholders, and engineers to translate business problems into reliable software.

Legal Requirements

Applicants must already be legally authorized to work in the U.S. Visa sponsorship and immigration support are not available.

Required Skills & Experience

• 5+ years building and shipping production systems in real user environments.
• Strong C# and modern .NET (Core and beyond) experience in large codebases with refactor and migration work.
• Expertise in SQL Server: schema design, query performance tuning, and transactional correctness.
• Experience with Azure and/or AWS; Azure is especially relevant.
• API design and versioned service-oriented architecture experience, including auth, reliability, and testing.
• Daily use of AI coding tools such as Cursor, Claude Code, Codex, or similar for multi-file refactors, migrations, test generation, and review workflows.
• Ability to work independently and collaboratively in fast-moving, cross-functional teams.

Preferred Qualifications

• Experience modernizing legacy ASP.NET / .NET Framework applications.
• Knowledge of Azure modernization patterns and connecting backends like SQL Server with optional Postgres or event-driven pipelines (Kafka).
• Front-end experience with Angular and/or React/Next.js, including microfrontend strategies.
• Experience establishing AI-friendly engineering practices, including CI guardrails, feature flags, and canary deployments.
• Background in regulated domains such as healthcare, fintech, or payments with an awareness of compliance and fast-paced delivery risks.

Salary

US base salary range: $125,241.00 – $187,862.00. Compensation may vary based on experience, education, and location. The listed amount represents the base salary only, not total rewards.

Equal Opportunity Employer

Lyric is an Equal Opportunity Employer that strives to create an inclusive environment, empower employees, and embrace collaborative success.