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.
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Misc
Everything else - from vehicle manuals to cocktail recipes and personal
notes.
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Site tools
Browse the repo without guessing the path.
Browse Everything
An automated index of every published doc, grouped by section and topic.
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The newest additions and edits across the site in one chronological feed.
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Recent additions
Latest work from each section.
Programming
View all → Cloud
Cloud
NATS JetStream Streams, Consumers, and Replay
Build Systems
Forgejo on GKE with Cloudflare and Security Hardening
Cloud
NATS, xRegistry, and Avro: A Routed Event Ingestion Plane
Git: Comprehensive Guide
Examples
Running prek for Fast Git Hooks
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
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
Profile Photo
Resumes
20260618 Resume
Resumes
20260529 Resume
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.