Fells Code LLC is a software company focused on building secure, reliable authentication and infrastructure tooling for modern applications.
We specialize in passwordless authentication systems, developer-focused APIs, and operational tooling that emphasizes clarity, security, and production-ready design. Our products are built to be explicit, inspectable, and deployable without vendor lock-in.
Fells Code builds software in the following domains:
- Passwordless authentication and identity infrastructure
- Developer tooling and APIs
- Self-hosted and open source systems
- Security-first application architecture
- Production-shaped local development workflows
Our work prioritizes correctness, transparency, and long-term maintainability over abstraction and convenience layers that obscure system behavior.
Seamless Auth is a passwordless authentication system designed to be embedded directly into applications. It avoids redirects, third-party hosted identity flows, and client-side token handling in favor of explicit, server-validated sessions.
Core projects:
-
Seamless Auth Server
https://github.com/fells-code/seamless-auth-api
The authentication server responsible for verification, session issuance, and identity state. -
Seamless Auth API (Core)
https://github.com/fells-code/seamless-auth-server/packages/core
Framework-agnostic authentication logic used across all integrations. -
Seamless Auth Express Adapter
https://github.com/fells-code/seamless-auth-server/packages/express
Express middleware for authentication and role-based authorization. -
Seamless Auth React SDK
https://github.com/fells-code/seamless-auth-react
Frontend integration for consuming authenticated session state in React applications.
Key characteristics:
- Passwordless authentication (OTP, WebAuthn, Passkeys)
- Cookie-based, server-side session validation
- Explicit authentication and authorization boundaries
- Self-hosted and infrastructure-agnostic
- Local development that mirrors production behavior
Documentation:
https://docs.seamlessauth.com
Seamless Glance is a developer-focused operational visibility tool designed to help teams quickly understand and triage cloud infrastructure.
It provides a read-only, terminal-based interface that surfaces high-signal information without requiring deep navigation through provider consoles.
Repositories:
Primary goals:
- Fast infrastructure triage
- Reduced cognitive overhead
- Secure, read-only access
- Clear operational context
All Fells Code projects follow a shared set of principles:
-
Explicit over implicit
Systems should be understandable by reading the code and configuration. -
Security as a baseline
Authentication, authorization, and secrets management are first-class concerns. -
Production-shaped development
Local development environments should behave like production, not mock systems. -
Minimal abstraction
Abstractions should clarify behavior, not hide it. -
Long-term maintainability
We build systems intended to be operated, extended, and audited over time.
Our products commonly use:
- Infrastructure: Docker, Terraform, AWS, IBM
- Backend: Node.js, TypeScript, Express, Rust, Python, PostgreSQL
- Frontend: React, Vite, Next.js
- CI/CD: GitHub Actions, automated release pipelines
- Security: Passwordless authentication, signed cookies, JWKS, secrets management
Technology choices are driven by operational clarity and security requirements rather than trends.
Fells Code maintains both open source and proprietary projects.
Each repository clearly defines its license and usage terms in its own LICENSE file. Please refer to individual repositories for specific licensing details.
Fells Code LLC
United States
Website: https://fellscode.com
Email: [email protected]
For partnerships, security inquiries, or collaboration, please reach out via email.
Fells Code exists to build software that strengthens the world we all share.