Programming
Technical guides, tutorials, and reference materials covering Python,
build systems, DevOps, and more.
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Welcome to Half Stack Python!
Half Stack Python
A quieter, more useful way to browse the site.
Technical guides, interactive calculators, career resources, and practical reference material organized into a smaller set of clear sections.
4 Primary sections
4 Calculator tools
Header-first Navigation model
Browse by section from the top bar, then drill into a calmer sidebar that
only shows the pages relevant to where you are.
Browse by section
Choose a lane and stay oriented.
Career
Career development resources, resume templates, interview preparation,
and professional growth content.
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Calculator Helpers
Interactive finance and utility tools, from mortgage and compound
growth planning to timezone and temperature helpers.
Explore Calculator Helpers →
Misc
Everything else - from vehicle manuals to cocktail recipes and personal
notes.
Explore Misc →
Recent additions
Latest work from each section.
Programming
View all → Examples
Reference
Chezmoi: Source Directory, Usage, and Secrets
Linux Process Diagnostics: top, /proc, Network Listeners, CPU Affinity, and Memory
Practical guide to diagnosing high-CPU and stuck processes, navigating /proc, understanding kernel vs user space memory, viewing TCP/UDP listeners, and controlling CPU affinity with taskset.
Open Source Contributions: 2026 Writeup
Build Systems • Jenkins
Advanced Groovy Shared Library Design and Testing
Build Systems • Jenkins
Jenkins Kubernetes Network Exposure and Vault for Region-Aware Deploys
Build Systems • Jenkins
Jenkins Region-Aware Kubernetes Deploy with Pkl and Python
Build Systems
Robust Error Handling and Post-Build Actions
Build Systems
Securing Credentials and Environment Variables
Cloud
Advanced Kubernetes Configuration Management
Calculator Helpers
View all →Compound Interest Monte Carlo Calculator
Estimate portfolio growth, retirement income sustainability, and inflation-adjusted outcomes using Monte Carlo simulation.
Fahrenheit and Celsius Converter
Convert temperatures between Fahrenheit and Celsius with a quick reference table for common values.
Texas Mortgage Payment Calculator
Estimate principal and interest, PMI, all-in monthly payment, and total interest over the life of a fixed-rate mortgage.
Timezone Reference
View live local times for Sydney, Los Angeles, Wichita, New York, and London.
Career
View all → Myloop
Mutual Non-Disclosure Agreement
Myloop
Original Mutual Non-Disclosure Agreement
Apple
20260324 Apple Interview Royston Dsouza
Interview prep notes covering CI/CD platform migration decisions, Jenkins shared libraries, Groovy pipeline patterns, Kubernetes automation, and rollout strategy at scale.
CMU MSE Application
Resumes
20260310 Resume
Apple
Apple Coding Drills: Concurrency and Rate Limiting (Python + Go)
Ten no-notes coding drills for Apple-style interviews with reference solutions in both Python and Go.
Apple
Apple Interview Story Bank and Incident Narratives (2026)
Resume-backed interview stories, incident response narratives, and strong panel questions for Apple Release Engineer interviews.
Apple
Apple Panel Interview Prep Playbook (2026)
Practical prep guide for a 5-round Apple Release Engineer panel: topic plan, likely coding prompts, system design framing, and resume-backed answer templates.
Apple
Apple Interview Guide: Platform Engineering Topics
A focused interview prep guide for Apple-style Release/Platform Engineering conversations across concurrency, system design, CI/CD, Kubernetes, and production reliability.
Apple