System Design

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P50, P95 and P99: percentiles and the latency your average hides

Understand P50, P90, P95 and P99, find the slowness your average hides, and learn to measure latency, aggregate histograms and set targets for your API.

System Design

software architecture

design docs

Design Docs: how to decide before the code without creating bureaucracy

Learn when to write a Design Doc, what to include, and how to review architecture, trade-offs, rollout and metrics before expensive decisions turn into code.

System Design

Architecture Decision Records (ADR): record decisions without creating bureaucracy

software architecture

architecture decisions

Architecture Decision Records (ADR): record decisions without creating bureaucracy

Code shows how the system works, but it rarely explains why it took that shape. Learn to use ADRs to preserve context, alternatives, and trade-offs without turning architecture into bureaucracy.

Requirements Engineering: from vague request to verifiable requirement

Bad software does not always start with bad code. Often, it starts with a poorly understood problem. See how clear requirements reduce rework and lead to better architecture decisions.

System Design

Anti-Corruption Layer: isolate your application from external models

software architecture

integration patterns

Anti-Corruption Layer: isolate your application from external models

Third-party contracts, statuses, and errors spread through the codebase little by little. Learn how an Anti-Corruption Layer isolates this coupling and when it is worth the cost.

How to estimate storage growth with writes, replication, and retention

A practical guide to calculating storage from writes per second, average data size, replication factor, and retention time before volume becomes cost or bottlenecks in production.

System Design

architecture

solutions architecture

Solutions Architecture: what it is, where it acts, and why it creates confusion

Understand what Solutions Architecture really is, where this role fits among other architecture disciplines, and why its scope is still so often misunderstood in practice.

Enterprise Software: what changes when the product needs to operate as a platform

Scale, availability, compliance, and integration stop being “extras” and become survival requirements. A practical guide to the trade-offs and decisions that separate a common system from an enterprise platform.

System Design