Senior Software Engineer – Fullstack

Lyric is an AI-first, platform-based healthcare technology company dedicated to simplifying the business of care. They are seeking a Senior Software Engineer – Fullstack to modernize their payment integrity platform, focusing on building intuitive web experiences and scalable services while leveraging AI tools for efficiency.

Responsibilities:

• Ship modernization work at a pace that surprises people
• Use AI agents (Cursor, Claude Code, Codex) to blow through framework upgrades, refactors, API extraction, test scaffolding, and documentation - while catching hallucinations and preventing regressions before they hit a PR
• Build reusable playbooks the team can actually follow: prompt templates, repo-level agent instructions, migration checklists, review heuristics, and clear 'definition of done' standards for AI-assisted changes
• Upgrade legacy services to current .NET (LTS where it makes sense), untangling architecture boundaries and fixing the performance issues that have been 'known' for years
• Push toward a proper API-layer architecture - RESTful, versioned - built for correctness and maintainability, not just 'it works.'
• Get your hands dirty with SQL Server: query performance, indexing, transactional correctness
• If there are data pipeline needs (Kafka, etc.), you'll help build those too
• Build with security and privacy as defaults, not afterthoughts
• Put real quality guardrails in place: automated tests that actually catch things, CI that blocks bad changes, structured logging, observability that tells you what's happening before users do
• Review code thoughtfully, have honest architectural conversations, and raise the bar without being a jerk about it
• Partner with analysts, stakeholders, and other engineers to turn business problems into working software - not just technically correct software, but software that actually solves the problem
• Help build delivery plans that are honest about trade-offs
• Delivery is predictable. Customer onboarding milestones are met. Features ship with confidence, not crossed fingers

Requirements:

• 5+ years building and shipping production systems. Not side projects - real software with real users
• Some C# and modern .NET experience (Core and beyond). Especially in large codebases and you've done meaningful refactoring and migration work, not just greenfield
• Strong SQL Server chops - schema design, query tuning, performance troubleshooting
• You've worked on data-heavy applications where the database wasn't an afterthought
• Cloud experience with Azure and/or AWS. Azure is particularly relevant here
• API design experience - you've built and maintained service-oriented architectures with real versioning, auth, reliability, and testing practices
• You actually use AI coding tools as a daily driver. Cursor, Claude Code, Codex, or similar - and not just for autocomplete
• You've used agents for multi-file refactors, migrations, test generation, and review workflows
• You have opinions about what works and what doesn't
• You communicate clearly. Good PR descriptions, straightforward design docs, pragmatic collaboration, low ego
• You've actually done a legacy ASP.NET / .NET Framework modernization before. You know where the bodies are buried and you have the scars to prove it
• Bonus points for Azure modernization patterns
• Experience with distributed systems tooling - Kafka, event-driven architectures, or working with Postgres alongside SQL Server
• Front-end experience with Angular and/or React/Next.js
• You've helped establish agent-friendly engineering practices: writing repo instructions that AI tools can follow, breaking work into agent-sized tasks, setting up CI guardrails for AI-generated code, feature flags, canary deployments - any part of the progressive delivery toolkit
• Background in regulated domains (healthcare, fintech, payments) where 'move fast and break things' will get you fired