Mathias Paulenko
Software Engineer & Founder of StackPractices
Mathias Paulenko
Software Engineer
Software engineer with 12+ years of experience building production systems across Python, JavaScript, React, and DevOps. I have contributed to enterprise projects spanning CI/CD pipelines, API design, cloud infrastructure, and full-stack development.
StackPractices is my personal project, born from a simple belief: great documentation should be copy-paste ready. Every recipe, pattern, and guide on this site is designed to save you time and help you ship faster.
Published Works (1008)
Apache Airflow: DAGs, Operators, Scheduling
Master Apache Airflow: DAGs, operators, sensors, XCom, scheduling, backfilling, connections,...
CI/CD Pipeline Security: Prevent Supply Chain Attacks
A practical guide to securing CI/CD pipelines: secrets management, least-privilege runners,...
Code Review Best Practices: Authors and Reviewers
A practical guide to useful code reviews: how to write reviewable code, give constructive feedback,...
Chaos Engineering — Principles, Tools, and Safe Experiments
A practical guide to chaos engineering: build resilient systems by intentionally injecting...
CI/CD Pipeline Guide: From Commit to Production
A practical guide to building CI/CD pipelines with GitHub Actions, testing gates, deployment...
Capacity Planning — Forecast, Scale
A practical guide to capacity planning for cloud and on-premise infrastructure: demand forecasting,...
Complete Guide to API Security
Secure your APIs end-to-end: rate limiting, auth, input validation, CORS, injection prevention,...
Complete Guide to Authentication Patterns
Implement production authentication: JWT, OAuth2, sessions, passkeys, MFA, SAML and OIDC SSO, RBAC...
Complete Guide to AWS Lambda in Production
Run AWS Lambda in production: cold starts, deployment patterns, connection pooling, observability,...
Cache Warmup Runbook
Operational runbook for warming caches after deploys, restarts and incidents: identify hot keys,...
Batch Processing Patterns
Design reliable batch processing pipelines for large datasets with retry logic, idempotency, and...
Background Jobs: Task Queues, Cron & Workers
Offload slow work from HTTP requests: run background jobs with task queues, cron scheduling, and...
AWS CLI Bash Scripts
A working set of Bash scripts that wrap the AWS CLI to provision, tag, audit, and clean up AWS...
Log Rotation and Compression in Bash
Rotate, compress and prune application logs with logrotate configs and custom bash scripts —...
Monitor Disk Usage
Alert when disk space crosses thresholds using a Bash script that checks mount points and notifies...
Bash Scripting for DevOps Automation and System Tasks
How to write reliable Bash scripts for automating deployments, system monitoring, log rotation, and...
Blue-Green Deployment Recipe
Deploy with zero downtime using blue-green environments, instant traffic switching, and automated...
Bash Backup Rotation: Retention and Integrity
Rotate Bash backups into daily, weekly, and monthly archives with retention, encryption, integrity...
How to Loop Over Files in Bash
How to safely loop over files and directories in Bash, handling spaces, globs, and large file lists...
Bash Parallel Execution
How to run shell commands in parallel with xargs, GNU parallel, and Bash background jobs while...
Text Processing in Bash: grep, sed & awk
How to build capable text processing pipelines with grep, sed, awk, cut, sort, uniq, and tr for log...
Configure iptables Firewall Rules with Bash
Set up a hardened iptables firewall with bash: SSH-safe rules, NAT port forwarding, IP blocking and...
Blue-Green Deployment Pattern
Run two identical environments and switch traffic between them. Deploy to the idle environment,...
Bridge Pattern for Decoupling UI Components from Themes
Separate an abstraction from its implementation so both can vary independently using the Bridge...