How to Write Technical Specifications

The format engineers actually read - and that prevents the rewrites.

A technical specification written at the right level of detail prevents a month of rework. Written at the wrong level it either gets ignored or becomes a compliance exercise nobody believes in. This guide covers the format, depth, and process that makes tech specs work in practice.

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When to Write a Tech Spec (And When Not To)

Not every feature needs a spec. A one-day UI change doesnt. A new service with three integrations does. The rule of thumb: if misunderstanding the requirements would cost more than 2 days of rework, write a spec first. The spec's job is not to describe the solution in exhaustive detail - its to surface disagreements before they become bugs. A spec that generates 10 clarifying questions in review has already done its job.

At Valletta Software, we focus on:

Title and status: problem statement author status (draft/review/approved/superseded)

Context: why this exists what problem it solves what happens if we do not build it

Goals and non-goals: explicit list of what the feature does NOT cover

Proposed solution: high-level approach key decisions alternative approaches considered

Data model: entities fields relationships - even as a simple table or ERD

API contract: endpoints request/response shapes error codes - before implementation

Open questions: list of unresolved decisions with owners and deadlines

The Spec Format That Gets Read

Length is not quality. One page is better than ten if it covers the decisions.

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Markdown in the repo: lives with the code versioned searchable PR-reviewable

RFC format: numbered status field discussion section - for cross-team decisions

Linear / Notion: for product-level context that non-engineers need to read

Google Docs: for collaborative drafting with stakeholders before final form

Mermaid diagrams: sequence diagrams and ERDs embedded in Markdown

Decision fields: every spec records who approved it and when - no orphan docs

Template: 1-page minimum viable spec plus extended template for complex features

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How to Write Technical Specifications - With Engineers Who Follow Them

We write specs before we write code. Every engagement includes a spec review for cross-service features.

Our engineers are trained in today's most powerful tools - Copilot, Claude, Cursor, and AI-assisted tooling - and use them daily to move faster without cutting corners.

Choose from a solo dev, mini team, or full squad. All powered by AI and ready to build from day one.

Let's keep it simple.

Our engineering process includes a mandatory spec review for any feature touching more than one service. Markdown-based specs, status fields, open questions, API contracts.

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