Match seniority to the task
A complex architecture or integration decision may need senior judgement, while well-defined implementation can be handled differently. Ask for relevant examples and discuss the actual challenges of your project. A higher rate can be worthwhile if it reduces rework or coordination, but that value should be demonstrated rather than assumed.
Clarify what a working day covers
Understand whether the engagement includes design discussion, meetings, testing, documentation and deployment. Define availability and how time is recorded. Compare rates for similar responsibilities and contract conditions. Keep estimates tied to delivery milestones so that you can distinguish productive work from time spent without a usable result.
Negotiate the engagement, not only the price
A longer commitment, clearer brief or flexible schedule may change the commercial arrangement. Avoid cutting testing and documentation simply to lower the rate. Agree review points and expectations for handover. The aim is predictable value and a sustainable working relationship, with the source code and decisions available to your team.