https://alldaystech.com/ 2026-08-31T00:00:00Z Latest guides and updates from All Days Tech. Custom Python Feed Generator https://alldaystech.com/guides/software-development/break-down-features-into-user-stories-step-by-step 2026-08-31T00:00:00Z 2026-08-31T00:00:00Z

A practical method for turning large features into small, valuable, testable user stories using user goals, workflow mapping, vertical slices, acceptance criteria, dependencies, and delivery sequencing.

Norbert Sowinski https://alldaystech.com/guides/software-development/choose-database-relational-vs-document-vs-key-value 2026-08-31T00:00:00Z 2026-08-31T00:00:00Z

A practical guide to choosing a database by comparing relational, document, and key-value models across relationships, transactions, query flexibility, scalability, consistency, indexing, and operational tradeoffs.

Norbert Sowinski https://alldaystech.com/guides/software-development/estimate-software-work-avoid-overcommitment-techniques 2026-08-31T00:00:00Z 2026-08-31T00:00:00Z

A practical guide to estimating software work with uncertainty ranges, decomposition, historical data, confidence levels, capacity planning, dependency analysis, buffers, and commitment discipline.

Norbert Sowinski https://alldaystech.com/guides/software-development/event-driven-architecture-queues-vs-streams-basics 2026-08-31T00:00:00Z 2026-08-31T00:00:00Z

A practical introduction to event-driven architecture covering message queues, streams, delivery semantics, consumer groups, ordering, retries, replay, retention, scaling, and how to choose the right model.

Norbert Sowinski https://alldaystech.com/guides/software-development/release-notes-that-help-users-templates-workflow 2026-08-31T00:00:00Z 2026-08-31T00:00:00Z

A practical guide to writing useful software release notes with clear structure, user impact, migration guidance, deprecations, screenshots, templates, ownership, review, automation, and publishing workflows.

Norbert Sowinski https://alldaystech.com/guides/software-development/testing-strategy-real-projects-what-to-automate-first 2026-08-31T00:00:00Z 2026-08-31T00:00:00Z

A practical guide to choosing which tests to automate first using business risk, regression frequency, feedback speed, maintenance cost, execution reliability, and the boundaries most likely to fail.

Norbert Sowinski https://alldaystech.com/guides/programming-languages/big-o-in-practice-choose-data-structures-fast 2026-08-30T00:00:00Z 2026-08-30T00:00:00Z

A practical guide to Big-O notation and choosing arrays, hash maps, sets, linked lists, queues, stacks, heaps, and trees according to real application operations.

Norbert Sowinski https://alldaystech.com/guides/programming-languages/build-simple-cli-tool-argument-parsing-exit-codes 2026-08-30T00:00:00Z 2026-08-30T00:00:00Z

A practical guide to command-line tool design covering arguments, flags, subcommands, validation, stdout and stderr, exit codes, help text, automation, signals, and predictable CLI behavior.

Norbert Sowinski https://alldaystech.com/guides/programming-languages/refactor-legacy-code-safely-small-steps-tests 2026-08-30T00:00:00Z 2026-08-30T00:00:00Z

A practical guide to refactoring legacy code with characterization tests, seams, dependency isolation, small reversible changes, incremental extraction, and continuous regression checks.

Norbert Sowinski https://alldaystech.com/guides/programming-languages/regex-for-everyday-developers-practical-patterns 2026-08-30T00:00:00Z 2026-08-30T00:00:00Z

A practical regex guide covering literals, anchors, classes, quantifiers, groups, alternation, extraction, replacement, validation, lookarounds, escaping, debugging, portability, and performance.

Norbert Sowinski https://alldaystech.com/guides/software-development/api-design-for-change-versioning-deprecation-compatibility 2026-08-30T00:00:00Z 2026-08-30T00:00:00Z

A practical guide to evolving APIs safely with additive changes, compatibility rules, explicit versioning, deprecation periods, migration plans, sunset communication, and consumer-aware rollout.

Norbert Sowinski https://alldaystech.com/guides/software-development/code-review-checklist-small-teams-quality-security 2026-08-30T00:00:00Z 2026-08-30T00:00:00Z

A practical code review checklist for small teams covering correctness, scope, tests, security, data integrity, maintainability, performance, observability, migrations, deployment risk, and reviewer communication.

Norbert Sowinski https://alldaystech.com/guides/software-development/write-technical-documentation-developers-use-templates 2026-08-30T00:00:00Z 2026-08-30T00:00:00Z

A practical guide to writing useful developer documentation with templates for README files, setup guides, API references, runbooks, architecture notes, ADRs, troubleshooting, and ongoing maintenance.

Norbert Sowinski https://alldaystech.com/guides/programming-languages/async-programming-promises-futures-coroutines-beginners 2026-08-29T00:00:00Z 2026-08-29T00:00:00Z

A beginner-friendly guide to asynchronous programming covering promises, futures, coroutines, async/await, event loops, schedulers, cancellation, timeouts, errors, concurrency, and structured async code.

Norbert Sowinski https://alldaystech.com/guides/programming-languages/error-handling-patterns-exceptions-vs-result-types 2026-08-29T00:00:00Z 2026-08-29T00:00:00Z

A practical language-agnostic guide to choosing between exceptions and Result types, designing typed errors, preserving causes, defining recovery boundaries, handling validation, retries, async failures, and logging.

Norbert Sowinski https://alldaystech.com/guides/programming-languages/read-and-debug-stack-traces-language-agnostic 2026-08-29T00:00:00Z 2026-08-29T00:00:00Z

A practical guide to understanding stack traces across programming languages, including exception messages, stack frames, nested causes, async boundaries, library code, source maps, symbols, and root-cause debugging.

Norbert Sowinski https://alldaystech.com/guides/programming-languages/unicode-text-encoding-for-developers-avoid-bugs 2026-08-29T00:00:00Z 2026-08-29T00:00:00Z

A practical guide to Unicode, UTF-8, UTF-16, code points, grapheme clusters, combining marks, normalization, emoji, mojibake, database text handling, and safe text-processing boundaries.

Norbert Sowinski https://alldaystech.com/guides/programming-languages/work-with-json-safely-validation-schemas-defensive-parsing 2026-08-29T00:00:00Z 2026-08-29T00:00:00Z

A practical guide to parsing JSON defensively, validating schemas and business rules, controlling unknown fields, handling duplicate keys, applying limits, and designing trustworthy API boundaries.

Norbert Sowinski https://alldaystech.com/guides/internet-of-things/esp32-beginner-pitfalls-setup-power-debugging 2026-08-27T00:00:00Z 2026-08-27T00:00:00Z

A practical ESP32 troubleshooting guide covering board selection, USB cables, serial ports, boot mode, unstable power, brownout resets, GPIO mistakes, strapping pins, Wi-Fi problems, deep sleep, and systematic debugging.

Norbert Sowinski https://alldaystech.com/guides/internet-of-things/iot-prototype-to-production-scaling-maintenance-lifecycle 2026-08-27T00:00:00Z 2026-08-27T00:00:00Z

A practical roadmap from IoT prototype to production covering hardware revisions, manufacturing, provisioning, backend scaling, OTA updates, fleet monitoring, maintenance, support, replacement, and secure retirement.

Norbert Sowinski https://alldaystech.com/guides/mobile-development/accessibility-for-mobile-apps-developer-checklist 2026-08-27T00:00:00Z 2026-08-27T00:00:00Z

A practical mobile accessibility guide covering semantic controls, VoiceOver, TalkBack, focus order, touch targets, gestures, text scaling, contrast, reduced motion, forms, custom components, accessibility testing, and release checks.

Norbert Sowinski https://alldaystech.com/guides/mobile-development/deep-linking-universal-links-app-links-step-by-step 2026-08-27T00:00:00Z 2026-08-27T00:00:00Z

Learn how verified mobile deep links work on iOS and Android, including Universal Links, App Links, AASA, Digital Asset Links, routing, verification, fallbacks, testing, and common configuration mistakes.

Norbert Sowinski https://alldaystech.com/guides/mobile-development/mobile-app-onboarding-ux-patterns-activation-retention 2026-08-27T00:00:00Z 2026-08-27T00:00:00Z

A practical mobile onboarding guide covering activation events, progressive onboarding, value-first experiences, account creation, permissions, empty states, personalization, checklists, lifecycle messaging, analytics, experiments, and retention.

Norbert Sowinski https://alldaystech.com/guides/mobile-development/mobile-performance-profiling-fix-ui-jank 2026-08-27T00:00:00Z 2026-08-27T00:00:00Z

A practical workflow for diagnosing dropped frames and stuttering mobile interfaces using frame timelines, CPU traces, layout inspection, GPU profiling, memory analysis, release builds, and repeatable performance tests.

Norbert Sowinski https://alldaystech.com/guides/mobile-development/offline-first-mobile-apps-sync-conflict-resolution 2026-08-27T00:00:00Z 2026-08-27T00:00:00Z

A practical guide to offline-first mobile architecture covering local databases, optimistic updates, outbox queues, background synchronization, retries, versioning, tombstones, conflict detection, merging, and user-visible sync states.

Norbert Sowinski https://alldaystech.com/guides/mobile-development/push-notifications-opt-in-segmentation-timing 2026-08-27T00:00:00Z 2026-08-27T00:00:00Z

A practical mobile push notification guide covering permission timing, pre-permission UX, APNs and FCM token management, segmentation, preferences, quiet hours, frequency caps, deep links, delivery analytics, and responsible re-engagement.

Norbert Sowinski https://alldaystech.com/guides/mobile-development/reduce-mobile-app-size-android-ios-techniques 2026-08-27T00:00:00Z 2026-08-27T00:00:00Z

A practical mobile app size guide covering Android App Bundles, R8, resource shrinking, native libraries, image and font optimization, iOS app thinning, asset catalogs, downloadable content, dependency audits, and automated size budgets.

Norbert Sowinski https://alldaystech.com/guides/mobile-development/secure-mobile-storage-keychain-vs-keystore-mistakes 2026-08-27T00:00:00Z 2026-08-27T00:00:00Z

Learn what belongs in iOS Keychain, what Android Keystore actually protects, how to store tokens and encrypted app data, when to require biometrics, how backups affect secrets, and which storage mistakes expose mobile credentials.

Norbert Sowinski https://alldaystech.com/guides/mobile-development/testing-mobile-apps-on-a-budget-unit-ui-e2e 2026-08-27T00:00:00Z 2026-08-27T00:00:00Z

Build a practical mobile testing strategy with many fast unit tests, focused integration coverage, a small set of UI tests, critical end-to-end smoke tests, deterministic fixtures, CI, emulators, simulators, and carefully selected physical devices.

Norbert Sowinski https://alldaystech.com/guides/internet-of-things/battery-life-estimation-iot-sensors-calculations 2026-08-25T00:00:00Z 2026-08-25T00:00:00Z

Learn to estimate IoT battery life from duty cycle and average current, then correct the ideal result for usable capacity, radio pulses, voltage drop, temperature, self-discharge, regulator losses, retries, aging, and real measurements.

Norbert Sowinski https://alldaystech.com/guides/internet-of-things/edge-computing-for-iot-when-to-process-on-device 2026-08-25T00:00:00Z 2026-08-25T00:00:00Z

A practical guide to deciding whether IoT data should be processed on the device, at an edge gateway, or in the cloud based on latency, bandwidth, privacy, offline operation, hardware resources, energy, security, and maintainability.

Norbert Sowinski https://alldaystech.com/guides/internet-of-things/iot-data-pipeline-design-telemetry-to-dashboard 2026-08-25T00:00:00Z 2026-08-25T00:00:00Z

A practical IoT data-pipeline guide covering device telemetry, MQTT or HTTP ingestion, validation, normalization, stream processing, storage, alerting, dashboards, retention, observability, and failure handling.

Norbert Sowinski https://alldaystech.com/guides/internet-of-things/secure-iot-devices-firmware-credentials-tls 2026-08-25T00:00:00Z 2026-08-25T00:00:00Z

A practical IoT security guide covering signed firmware, secure boot, rollback protection, unique device credentials, secret storage and rotation, TLS, certificate validation, mutual authentication, least privilege, monitoring, and device decommissioning.

Norbert Sowinski https://alldaystech.com/guides/internet-of-things/smart-home-automation-reliability-triggers-failsafes 2026-08-25T00:00:00Z 2026-08-25T00:00:00Z

Build smart-home automations that survive sensor errors, network outages, cloud failures, delayed state, device restarts, duplicate triggers, and unavailable hubs using local control, timeouts, safe defaults, retries, watchdogs, and manual overrides.

Norbert Sowinski https://alldaystech.com/guides/devops-sysadmin/automated-backups-linux-servers-verify-restore-drills 2026-08-24T00:00:00Z 2026-08-24T00:00:00Z

Build a practical Linux backup workflow with automated scheduling, encrypted off-host storage, retention, database-safe backups, integrity checks, failure monitoring, recovery objectives, and regular restore drills.

Norbert Sowinski https://alldaystech.com/guides/devops-sysadmin/kubernetes-for-small-projects-when-it-helps-when-not 2026-08-24T00:00:00Z 2026-08-24T00:00:00Z

A practical decision guide for small teams evaluating Kubernetes: workloads, replicas, deployments, networking, autoscaling, storage, observability, upgrades, failure modes, operational cost, and simpler alternatives.

Norbert Sowinski https://alldaystech.com/guides/devops-sysadmin/sre-for-beginners-slis-slos-error-budgets 2026-08-24T00:00:00Z 2026-08-24T00:00:00Z

A practical beginner guide to service level indicators, service level objectives, error budgets, availability, latency, good-event ratios, burn rate, SLO monitoring, and reliability policies.

Norbert Sowinski https://alldaystech.com/guides/internet-of-things/choose-iot-connectivity-wifi-vs-ble-vs-lorawan 2026-08-24T00:00:00Z 2026-08-24T00:00:00Z

Compare Wi-Fi, Bluetooth Low Energy, and LoRaWAN for IoT projects by range, data rate, battery life, latency, infrastructure, topology, security, smartphone support, and deployment complexity.

Norbert Sowinski https://alldaystech.com/guides/internet-of-things/mqtt-explained-topics-qos-retained-messages-security 2026-08-24T00:00:00Z 2026-08-24T00:00:00Z

Learn MQTT from the publish/subscribe model through topic hierarchies, wildcard subscriptions, QoS 0/1/2, retained state, sessions, Last Will messages, TLS, authentication, authorization, and practical IoT security.

Norbert Sowinski https://alldaystech.com/guides/devops-sysadmin/centralized-logging-small-stack-what-to-collect 2026-08-23T00:00:00Z 2026-08-23T00:00:00Z

Build a lightweight centralized logging pipeline with structured application logs, Grafana Alloy, Loki, Grafana, sensible labels, correlation IDs, retention, redaction, useful searches, dashboards, and alerts.

Norbert Sowinski https://alldaystech.com/guides/devops-sysadmin/linux-troubleshooting-playbook-disk-cpu-memory-network 2026-08-23T00:00:00Z 2026-08-23T00:00:00Z

A practical Linux incident playbook for disk exhaustion, high CPU and load, memory pressure, swap, OOM kills, networking, DNS, sockets, systemd services, and logs.

Norbert Sowinski https://alldaystech.com/guides/devops-sysadmin/minimal-monitoring-stack-metrics-alerts-oncall 2026-08-23T00:00:00Z 2026-08-23T00:00:00Z

Build a small but useful monitoring stack with Prometheus, Grafana, Alertmanager, host and application metrics, external availability checks, actionable alerts, runbooks, escalation, and simple on-call practices.

Norbert Sowinski https://alldaystech.com/guides/devops-sysadmin/secrets-management-basics-env-vars-vaults-rotation 2026-08-23T00:00:00Z 2026-08-23T00:00:00Z

A practical secrets-management guide for small teams covering environment variables, centralized secret stores, least privilege, runtime delivery, auditing, versioning, zero-downtime rotation, revocation, and leak response.

Norbert Sowinski https://alldaystech.com/guides/devops-sysadmin/zero-downtime-deployments-blue-green-vs-rolling 2026-08-23T00:00:00Z 2026-08-23T00:00:00Z

Compare blue-green and rolling deployments for small web apps, including traffic switching, readiness, graceful shutdown, rollback, database compatibility, capacity, health checks, and safe deployment monitoring.

Norbert Sowinski https://alldaystech.com/guides/data-science/ab-testing-small-traffic-experiment-design 2026-08-21T00:00:00Z 2026-08-21T00:00:00Z

A practical guide to trustworthy experiments when traffic is limited: MDE, power, duration, randomization, focused metrics, guardrails, SRM checks, peeking, variance reduction, and stop-or-run decisions.

Norbert Sowinski https://alldaystech.com/guides/data-science/csv-to-dashboard-lightweight-analytics-pipeline 2026-08-21T00:00:00Z 2026-08-21T00:00:00Z

Build a practical CSV analytics workflow with validation, pandas cleaning, Parquet storage, DuckDB queries, reusable aggregates, Streamlit caching, automated refreshes, and production-friendly data quality checks.

Norbert Sowinski https://alldaystech.com/guides/data-science/explain-model-predictions-shap-vs-permutation-importance 2026-08-21T00:00:00Z 2026-08-21T00:00:00Z

Learn when to use SHAP for local prediction explanations, when permutation importance is better for global performance dependence, and why correlated features, evaluation data, background data, and metric choice matter.

Norbert Sowinski https://alldaystech.com/guides/data-science/time-series-backtesting-basics-seasonality-drift 2026-08-21T00:00:00Z 2026-08-21T00:00:00Z

Learn how to backtest time-series models realistically with chronological folds, expanding and sliding windows, correct forecast horizons, seasonal baselines, leakage-safe features, drift analysis, and horizon-specific metrics.

Norbert Sowinski https://alldaystech.com/guides/devops-sysadmin/production-ready-dockerfile-small-web-apps 2026-08-21T00:00:00Z 2026-08-21T00:00:00Z

Build smaller, safer and more reproducible container images with multi-stage builds, deterministic dependencies, non-root execution, BuildKit secrets, health checks, proper process startup, caching, and runtime hardening.

Norbert Sowinski https://alldaystech.com/guides/data-science/eda-checklist-messy-real-world-datasets 2026-08-20T00:00:00Z 2026-08-20T00:00:00Z

A practical EDA workflow for messy datasets: verify schema, profile missingness, find duplicates, validate ranges, normalize categories and dates, investigate outliers, inspect relationships, catch leakage, and document data-quality decisions.

Norbert Sowinski