Technical Specifications
A technical specification is a written design artifact you use to think before coding, align stakeholders, and define what “done” means. It sits between Design Docs and Documentation.
- Should be broad enough to explain the problem and trade-offs, but precise enough that someone else can implement and operate the change.
- Start from the problem, not the implementation. Clarify the problem, context, goals, non-goals, assumptions, proposed solution, rollout, risks, and success metrics before you write code. The main value is forcing you to scope the work, expose edge cases early, and align reviewers.
- Make the spec precise where interfaces and operations matter.
- Once a spec is detailed enough to generate reliable software, it starts to look like code or pseudocode. Use specs to improve thinking and coordination, not to skip precision.
Key Sections
- Metadata. Add the title, authors, reviewers, status, dates, and linked tickets so the document has clear accountability and revision context.
- Problem Statement and Context. Explain the user or operational problem, why it matters, the relevant background, and the boundary of the system you are changing.
- Goals, non-goals, and assumptions. State what success includes, what is explicitly out of scope, and what conditions you rely on so reviewers can challenge scope early.
- System overview and architecture. Outline the main components, abstraction layers, dependencies, and how the pieces fit together before you dive into implementation detail.
- Domain model, interfaces, and invariants. Define the important entities, data shapes, APIs or contracts, state machines, and normalization rules precisely enough that implementers make the same decisions.
- Execution, failure, and safety model. Describe the main flows, failure modes, recovery behavior, trust boundaries, and operational safety rules for the system you are proposing.
- Test, rollout, and observability plan. Say how you will validate the change, measure it in production, deploy it, and roll it back if needed.
- Alternatives, risks, open questions, and definition of done. Record trade-offs, unresolved decisions, success metrics, milestones, and the checklist that marks the work complete.