Why a Tech Spec Determines Project Success

90% of conflicts between clients and developers arise from one thing: everyone had something different in mind. The client wanted "like Apple", the developer did "as understood". Without a spec, development becomes a game of broken telephone where requirements change every week, the budget balloons and deadlines slip.

A good technical specification is not bureaucracy. It's a tool for shared understanding between everyone involved. Time spent writing the spec = time saved on rework (usually in a 1:5 ratio).

Tech Spec Structure: 8 Required Sections

1. Goals and Business Objectives

The most important section that is most often missing. The developer must understand why the site exists, not just what should be on it.

Right: "Increase contact form submissions by 30% over 6 months through UX improvements and SEO for key search queries."

Wrong: "Make a beautiful modern website."

2. Target Audience

Describe who your typical visitor is: age, occupation, the problem they're solving on the site, technical literacy, devices used (mobile-first?), language.

Ideally — 2–3 user personas. Example: "Elena, 34, coffee shop owner, looking for a wholesale coffee supplier, browses on iPhone, not tech-savvy, values speed and clarity."

3. Site Structure and Page Descriptions

List all site pages and describe each one — not just "Home" and "Contacts" — all of them. For each page: goal (what should the visitor do or understand), content (which blocks, sections, texts, images), and CTA (where does the visitor go next).

4. Functional Requirements

List all "moving parts" of the site. For each function, specify what it does — not how it's implemented (that's the developer's job). Common functions by site type:

  • Corporate site: contact form, online chat, map, service filter, multilingual

  • Online store: catalog with filters, cart, payment, personal account, order tracking, delivery integration

  • Landing page: form with validation, promo timer, CRM integration

5. Design: References and Constraints

Don't write "make it beautiful" or "something modern." Instead:

  • References: 3–5 sites you like + comment on what specifically (color scheme, typography, structure, animations)

  • Anti-references: sites you don't like + why

  • Brand identity: do you have a brandbook, logo, corporate colors and fonts?

  • Constraints: "no distracting animations", "no dark theme", "minimalism"

6. Technical Requirements and Platform

  • CMS: WordPress, Tilda, Laravel, custom — already chosen or open to suggestions?

  • Hosting: where will it be hosted, is the domain already registered?

  • Performance: expected visitor count? Peak loads?

  • SEO: basic SEO optimization needed? Structured data? Multilingual?

7. Integrations

List all external systems the site must "talk" to:

  • CRM (HubSpot, Pipedrive) — pass leads from forms

  • Payment gateways (LiqPay, Monobank)

  • Delivery APIs (Nova Poshta)

  • Analytics (Google Analytics 4, Tag Manager, Facebook Pixel)

  • Email (SendGrid, Mailchimp)

  • Messengers (Telegram bot, WhatsApp Business API)

8. Content

  • Who writes the texts — you or the developer? (if the developer — that's a separate cost item)

  • Who provides photos and illustrations?

  • How many pages of content are needed before launch?

What NOT to Include in the Tech Spec

  • Technical implementation details — "build it in React with Redux and MongoDB" — if you're not technical, trust the developer to choose the stack. The spec describes what, the developer decides how.

  • Design mockups — the spec comes before design, not the other way around

  • Exact texts for every block — specifying the content type is sufficient

  • Copying a competitor — "I want it like Rozetka" without knowing what specifically — not a requirement, a source of misunderstandings

Agile vs Waterfall: Which Approach to Requirements to Choose

Waterfall

Full spec → approval → development → testing → launch. Suitable for projects with fixed requirements, fixed budget and deadline, or government tenders where the spec is a legal document. Downside: if mid-development a requirement turns out to be wrong — rework is expensive.

Agile (Iterative)

General vision → development in sprints → client demo → adjustment → next sprint. Suitable for products where requirements may change, startups and MVPs, long projects (3+ months).

For most commercial websites — a hybrid approach: basic 10–15 page spec + flexibility on details during development.

Common Tech Spec Mistakes

  • "Make it beautiful" — subjective. What looks beautiful to you may be a nightmare for your audience

  • No priorities — if everything is "must have", nothing is a priority. Split into Must / Should / Could / Won't (MoSCoW)

  • Spec without examples — "the button should be noticeable" → add a reference

  • Changing requirements after development starts — new requirements after signing = new budget or cut other features

  • Spec without an owner — who makes final decisions on conflicting issues?

How We Work With Tech Specs at IT Master

In practice, most clients come to us without a spec — and that's normal. Our process:

  1. Discovery session (1–2 hrs) — we ask questions, understand the business and goals

  2. Prototype — wireframe of main pages to agree on structure

  3. Technical specification — we write it together or help refine yours

  4. Estimate and contract — fixed budget or T&M depending on the project

Want help writing a tech spec or an estimate for your project? Fill out the form — we'll get back to you within one business day.