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)
Deployment Checklist Template
A copy-paste verification checklist for safe production deployments, from pre-merge tests to...
Network Security Documentation Template (VPC, Firewall)
A template for documenting VPC, firewall, and DNS security rules inventory.
Network Segmentation Policy Template
A template for documenting network security zones, segmentation rules, and traffic controls between...
Vendor Risk Assessment Template
A template for evaluating third-party vendor security and operational risks.
CONTRIBUTING.md Template — Contributing Guide
A ready-to-use CONTRIBUTING.md template for open-source and internal projects, with maintainer...
Connection Pooling: Optimize Database Connections for Scale
A practical guide to database connection pooling: sizing pools, handling idle timeouts, detecting...
Complete Guide to Observability with the Grafana Stack
Set up metrics, logs, and traces with Grafana, Prometheus, Loki, and Tempo. Covers instrumentation,...
Prometheus and Grafana: Metrics, Dashboards, Alerting
Instrument services with Prometheus metrics, query them in PromQL, build Grafana dashboards, and...
Distributed Tracing: Request Flow Across Services
A practical guide to distributed tracing: instrumenting applications, trace propagation, sampling...
LangChain LCEL: Compose Chains with Pipes & Fallbacks
Build composable LLM pipelines with LangChain Expression Language (LCEL) using pipes, parallel...
Deploy Applications to Kubernetes with Helm Charts
Package, version, and deploy Kubernetes applications using Helm charts with value overrides,...
Helm Chart Templating: Package Kubernetes Manifests
Build a production-ready Helm chart from scratch: values, helpers, conditionals, ranges, hooks,...
Cursor-based Pagination with GraphQL Relay Connections
Implement Relay-style cursor pagination in GraphQL with edges, nodes, and pageInfo for efficient...
Advanced iptables Firewall Rules and Hardening
Harden a Linux server with iptables: DDoS limits, connection tracking, IPv6, packet logging,...
Prevent SQL Injection Attacks
How to write parameterized queries and use ORMs to eliminate SQL injection vulnerabilities across...
External Configuration Store Pattern
Centralize application configuration outside deployment artifacts to support live updates,...
Visitor Pattern: Extensible Operations in TypeScript
Separate algorithms from the objects they operate on, allowing new operations to be added without...
Health Check Pattern: Expose Liveness and Readiness Probes
Implement liveness and readiness probes for container orchestrators. Covers Kubernetes probe...
Data Quality Rules Template: SQL, dbt & Great Expectations
A copy-paste template for defining data validation rules per dataset and column, with severity...
Container Security Baseline Template
A baseline template for hardening container images, runtimes, and orchestration configurations...
Complete Guide to CI/CD with GitHub Actions
Build CI/CD pipelines from scratch with GitHub Actions. Covers workflows, runners, matrix builds,...
Distributed Tracing: OpenTelemetry, Jaeger, Zipkin
Master distributed tracing with OpenTelemetry, Jaeger, and Zipkin. Trace propagation across...
Testcontainers: Real Dependencies in Integration Tests
Master Testcontainers for integration testing with real databases, message brokers, and APIs....
Transform Data in the Warehouse with dbt
How to use dbt for SQL-based data transformations with models, tests, materializations, macros, and...