Presales & Solutioning

What this area actually covers

Presales — variously called solution engineering, sales engineering or presales consulting — is the technical work done before a contract exists. A prospective customer has a problem and, usually, a budget. Your job is to establish what the problem really is, decide what your product or your firm would build to solve it, prove the parts genuinely in doubt, write down what it costs and what it depends on, and defend all of that in front of the people who will pay for it and the people who will operate it afterwards.

The work divides into four modes that reward different skills, and interviews probe each separately. Discovery is investigative: you are diagnosing, and also deciding whether this is a real opportunity. Demonstration is performative and unforgiving — live software, live questions, no retakes. The proposal is written engineering, read by strangers including procurement and legal. A proof of concept is an experiment designed to remove one named reason not to buy.

Mode	What it is for	The characteristic failure
Discovery	Find the funded problem and the decision process	Leaving with a feature list and no idea who signs
Demo	Make the answer credible in twenty minutes	Showing everything the product does
Proposal	Make it defensible without you in the room	Prose that quietly became a contractual promise
POC	Retire the doubts that block the deal	Free delivery work with no definition of done

Treat it as a genuine engineering discipline, because the design decisions are real and the constraints are hard: an existing identity provider, data residency rules, the operating team's actual skills, a fixed-price contract model. Adjacent things get wrongly bundled in. Marketing and technical evangelism are one-to-many with no named deal attached. Post-sale solution architecture inherits your promise and is accountable for delivering it. And sales itself owns the number, the negotiation and the relationship, none of which are yours.