Migrating from Claude Code to Codex — motivation and day one
Why am I migrating from Claude Code to OpenAI Codex? First impressions of its speed, limits, price, configuration import, and code quality.
Hello, I'm
Patryk
Roguszewski.
Software Engineer
Coding since 2006. I build products around real business needs — pragmatic, fast, without cutting the corners that matter. Technology is a means; shipping quality is the goal.
More about me
The problem always comes before the stack. Deep domain understanding, tight feedback loops, frequent releases — that's what makes software worth shipping. The stack follows the problem, not the other way around. My goal is always the same: ship quality fast — without skipping what actually matters.
- → Infoshare 2022 — web3 in the backend
- → Boiling Frogs 2024 — tech-agnostic microservices
Led teams building products used by millions. Currently focused on bringing LLMs into real production workflows.
Off-screen: dad, gym, keto, trading, sci-fi, games, swimming & cycling.
What I work with
- Backend
- C# / .NET · Microservices · Modular monolith · Performance engineering · Node.js
- AI Engineering
- LLMs (OpenAI, Claude, Perplexity) · Semantic Kernel · OpenAI Agents SDK · Claude Code · Promptfoo evals · Langfuse
- Frontend
- Angular · Flutter · Nuxt
- DevOps & Cloud
- Azure · Docker · Kubernetes · CI/CD · Infrastructure as code
- Data
- SQL Server · PostgreSQL · PostHog · Data-driven product decisions
- Product mindset
- Technology is a means, not an end — quality and delivery speed over gold-plating. Deep domain knowledge, close work with business stakeholders.
Recent posts
All posts →Azure AD authentication for Angular & .Net core backend
Implement Azure AD single sign-on for Angular and a .NET Core backend using MSAL, JWT authentication, Microsoft Graph, and group authorization.
Rest vs gRPC – performance benchmark in .Net Core 3.1 - Azure
REST vs gRPC on Azure Kubernetes: an Application Insights benchmark using 16 client pods, 2 server pods, and 19,200 requests per hour.
How to handle gRPC errors in .Net Core
Handle .NET Core gRPC failures with server interceptors and RpcException while returning useful HTTP status codes for Application Insights monitoring.
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