What Does a Business Analyst Do in IT? Requirements That Teams Can Build

A business analyst bridges business and engineering: gathers requirements, models processes, clarifies edge cases, and documents what “done” means before code is written (and while it changes).

This guide explains the role in practical terms: what the person actually does, core skills, and when a business should hire for this position - without buzzword fog.

Core responsibilities

Day to day, the role typically covers:

• Interview stakeholders and map as-is / to-be processes.
• Write requirements, user stories, use cases, and acceptance criteria.
• Maintain glossaries, rules, and dependency matrices.
• Support UAT and validate that delivery matches business intent.
• Reduce ambiguity that causes rewrites mid-sprint.

Skills that matter

Tools change; the underlying competencies stay valuable:

• Requirements engineering, process modeling (BPMN), workshops
• Clear writing, facilitation, conflict mediation
• Domain learning speed; SQL/analytics basics are a plus
• Working knowledge of agile delivery practices

When you need this role

Enterprise integrations, complex domains (finance, logistics, insurance), or when “everyone understood differently” keeps burning budget.

Bottom line

A good BA makes engineers faster by removing guesswork - not by writing novels nobody reads.