Marcin Jahn

Marcin Jahn is an independent software publisher whose catalog, available through marcinjahn.com, currently features a single focused developer utility called puff. Puff is a command-line tool designed to manage private configuration files for development projects, addressing a common and persistent challenge in software engineering: keeping sensitive or environment-specific settings organized, separate, and consistent across projects without exposing them to version control or losing track of them between machines and team members. As a CLI-based solution, puff fits naturally into terminal-driven workflows, making it suitable for developers who prefer lightweight, scriptable tooling over heavyweight graphical applications. Tools in this category are typically used to handle files such as environment variable definitions, local credentials, API keys, and per-project overrides that must remain private while still being easy to apply, switch, and maintain during day-to-day development. This places the publisher's offering squarely within the broader category of developer productivity and configuration management software, a segment that also commonly includes dotfile managers, secrets handling utilities, environment switchers, and project scaffolding tools. Such software is most valuable to individual developers, freelancers, and small engineering teams who work across multiple projects or machines and need a reliable, repeatable way to bootstrap and maintain their local setups. Because puff is distributed as a command-line package, it can be integrated into shell scripts, onboarding documentation, and automation pipelines, reducing manual setup time and the risk of configuration drift. While the publisher's range currently consists of this one package, it reflects a focused, practical approach to software publishing: solving a narrow, well-defined problem in the developer workflow with a dedicated, purpose-built tool rather than a broad, general-purpose platform.