Ceos3c
stefan@ceos3c:~$ cat README.md
Complicated Things - Made Easy
How I use AI to code, ship products, edit videos and run my own servers. Tested workflows and honest notes from a senior engineer building in public.
- 294tutorials
- 15topics
- 2016writing since
AI WorkflowsClaude Code Plan Mode vs One-Shot: Same App, 5 Ways
Claude Code plan mode vs one-shot vs opusplan: I built the same app 5 ways and measured cost and time from the logs. Sonnet one-shot won.
Fresh from the lab
All AI Workflows
AI WorkflowsHerdr: Run Claude Code Agents on Every Machine You Own
Herdr guide: install, the shortcuts that matter, four Claude Code agents in parallel worktrees, and Mac, Linux and Windows (WSL2) in one Herdr.
AI WorkflowsHiggsfield MCP: AI B-Roll in a Claude Code Video Pipeline
Higgsfield MCP in my Claude Code video pipeline: a shot plan from the transcript, stills first, Seedance 2.5 clips, a HyperFrames cut and 840 credits.
Pick a topic
All Topics- $ cd ~/aiAI Workflows
Claude Code, MCP and AI coding workflows I use to ship my own products. Tested setups, real prompts and the parts that broke.
9 posts - $ cd ~/linuxLinux
Linux guides that explain what's going on: processes, memory, systemd, permissions, shell scripting and real error fixes.
72 posts - $ cd ~/securityCyber Security
Ethical hacking, Kali Linux, Metasploit, Nmap and bug bounty guides, written since 2016 and still updated. Beginner friendly.
52 posts - $ cd ~/web-developmentWeb Development
Web development tutorials: VS Code, Node, React, Next.js, Tailwind, JavaScript and TypeScript, explained step by step.
47 posts - $ cd ~/self-hostingSelf-Hosting
Self-hosting guides: VPS setups, NAS builds, Nextcloud, Plex, monitoring and backups on servers you control.
18 posts - $ cd ~/sysadminSysAdmin
Classic sysadmin guides: Windows Server, Group Policy, FOG imaging, UniFi and monitoring. Older, still used.
35 posts - $ cd ~/pythonPython
Python for beginners, one concept at a time: syntax, variables, lists, strings and exercises to practice with.
26 posts - $ cd ~/pfsensepfSense
pfSense guides for home labs and small offices: site-to-site VPN, OpenVPN, multi-WAN, DMZ, DNS and firewall rules.
18 posts - $ cd ~/indie-makingIndie Making
Building and selling my own products in public: launches, pricing, distribution, social proof and real revenue numbers.
12 posts
Latest
Older posts- #AI Workflows
Claude Code Plan Mode vs One-Shot: Same App, 5 Ways
Claude Code plan mode vs one-shot vs opusplan: I built the same app 5 ways and measured cost and time from the logs. Sonnet one-shot won.
10 min - #AI Workflows
Herdr: Run Claude Code Agents on Every Machine You Own
Herdr guide: install, the shortcuts that matter, four Claude Code agents in parallel worktrees, and Mac, Linux and Windows (WSL2) in one Herdr.
8 min - #AI Workflows
Higgsfield MCP: AI B-Roll in a Claude Code Video Pipeline
Higgsfield MCP in my Claude Code video pipeline: a shot plan from the transcript, stills first, Seedance 2.5 clips, a HyperFrames cut and 840 credits.
6 min - #AI Workflows
Reverse Engineer Anything: REA + Ghidra on a Game DLL
Reverse Engineer Anything (REA) + Ghidra + Claude on an old MMO’s game.dll: the setup, the exact prompt and an honest look at the results.
5 min - #AI Workflows
AI Coding Workflow: Orchestrating Agents With Roadmaps
My AI coding workflow: a roadmap board that plans the work, hands each tier to an agent with cheap subagents, and tracks what’s done. Full demo inside.
8 min - #Web Development
Developer Day Planning: Fit Work Around the Time You Have
Developer day planning starts with the hours already spoken for. Meetings, review duty, support requests, lunch and a hard stop all take time. Write those down first, then choose flexible work that fits the remainder. A calendar shows appointments. A task list shows intentions. Planning a developer day means looking at both before deciding how …
2 min - #pfSense
pfSense Site to Site VPN with IPsec: Step-by-Step Guide (2026)
In this article, you will learn how to create a pfSense site-to-site VPN tunnel between two pfSense firewalls!
3 min - #Linux
Linux Shared Memory Tutorial: POSIX and System V Examples in C
Linux shared memory lets two or more processes read and write the same block of RAM, with no copying through pipes or sockets in between. That makes it the fastest way for processes on one machine to talk. Below are two complete C programs, a writer and a reader, that compile and run as-is, plus …
4 min - #Linux
Linux systemd Explained: systemctl Cheat Sheet, Unit Files and Timers
Linux systemd is the first process that starts on almost every modern distro, and it manages everything after that: services, mounts, timers, logs. Day to day you talk to it with two commands, systemctl to control services and journalctl to read their logs. Learn about 15 commands and one unit file layout and you can …
6 min - #Linux
Linux Memory Management Explained: Free vs Available, Swap and the OOM Killer
Linux memory management in one sentence: the kernel uses every bit of RAM your programs aren’t using as disk cache, and hands it back the moment a program needs it. That’s why free often shows almost no “free” memory on a perfectly healthy machine. The number you actually care about is available , not free. …
8 min
Hi, I’m Stefan
I started Ceos3c in 2016 and still write every guide by testing it on my own machines first. These days I build products with AI agents and share the workflows here.