Site Engineer Interview Questions

Two ways to fail: humiliate him in front of the gang and lose him for good, or say nothing and lose the site.

Take him aside. Ask why first — sometimes he has a real reason, and if he's right, say so in front of him. If he isn't, give the instruction plainly with the reason, and make clear the work won't be signed off otherwise. If it keeps happening, it goes to your project manager as facts, not a complaint. Then tell them what you did to win him round, because that's the part they're listening for.

It goes through the chargehand who speaks their language, and you check it by asking him to repeat it back — never by asking "understood?". Spray paint on the deck, a sketch on the formwork, or one finished example ("like this one") does more than a paragraph.

If you've picked up working words in Hindi, Urdu or Tagalog, mention it simply. It's the kind of detail that gets believed.

Numbers, not impressions: square metres of formwork, tonnes fixed, cubic metres placed per gang-day, against the programme allowance or the same gang's output on earlier floors.

Then the cause before the blame. Did materials arrive? Was the area ready? Was the crane tied up with another trade? Waiting looks like laziness from a distance.

Asked at every level; what changes is the size of mistake they expect. They're listening for three things: a real mistake rather than a humblebrag, that you reported it, and that something changed afterwards.

This tests whether you can say no to your boss without sounding obstinate. Give facts: what isn't signed off, what happens if it's poured anyway — a rejected element, an NCR, possibly breaking it out — and the fastest way to get sign-off today.

Then offer something: an extra gang, an earlier re-inspection, or pouring the accepted bays now and the rest tomorrow. He's pushing for the programme. Give him a programme, not a lecture.

Don't apologise for having no experience, and don't hide behind "I'm a fast learner". Say what you can do in week one — read drawings, take off quantities, keep the diary, assist on inspections — then one concrete thing you've done: a placement, a summer with a contractor, a week standing next to a pour.

And say what you can't yet do: "I haven't run a gang, and I'll lean on the foreman for the first couple of months." That makes you credible, not weak.

They're checking you won't ask to move indoors after one summer. Give a reason rooted in something you've done on a site, not in a dislike of desks.

They're asking whether you'll resign in two months. Give your real conditions now, not after you've signed.

The real question: do you inspect it yourself first, or do you use the consultant's inspector as your free quality control?

Walk it in the order you'd walk the deck. Formwork: levels, dimensions against the drawing, line and plumb, joints tight enough not to bleed grout, release agent on. Falsework: props on sound bearing, not loose fill; spacing and bracing as designed, not as the gang thinks. Reinforcement: bar sizes and counts, cover and spacers, laps where the drawing puts them. Everything cast in: ducts, sleeves, conduits, and a signature from the M&E engineers saying they're done. Then the inspection request goes in, quoting the drawing and its revision.

Finish with pour day itself, because that's where people forget things: pump and trucks booked, a spare poker, lighting if it'll run past dusk, the lab technician for cubes, and a plan for when something stops.

Element, gridline and level, drawing and revision, the time you want them. The notice period is whatever your project's quality procedure says — quote your last job's number, don't invent a universal one.

Split it: what carries load and what gives shape. Load: props or scaffold, their bearing, spacing, bracing, and whether it matches a design or was improvised. Shape: dimensions, levels, tight joints, side restraint on deep beams.

Say the sentence that marks you out: for tall or long-span falsework there should be a design by a competent engineer, and your job is to check that what's built matches it — not to approve the foreman's version.

Don't quote a number from memory. Sides before soffits; times from the specification or the approved method statement; early striking only on cube results and in writing.

The civil interview asks what cover is for. This one asks what you do with a tape measure.

Random spots, not the easy ones at the edge. Concrete spacers, not offcuts of timber or brick. Laps staggered, not all in one section. Column starters tied so they don't walk during the pour. And walkways over the top mat, because a gang carrying a hose will flatten it otherwise — which you'll only see after it's cast.

The pump isn't the problem. The problem is a cold joint wherever the concrete happens to stop.

In order: ring the supplier for a replacement and get a real arrival time, not a hopeful one. Hold or reschedule the trucks on the road so nothing sits in the sun going off. Nobody adds water to a waiting truck to keep it workable. If the delay will run long, don't let the edge fall where it falls — stop at the nearest acceptable joint position with the agreement of the engineer responsible and the consultant, and form a stop end. Tell your project manager and the consultant now, not tomorrow, and note the times.

Afterwards: prepare the joint surface before the next pour as the specification requires, and keep the delivery tickets and photos together.

Three questions that are really one: a truck turns up long after batching — do you take it? The gang wants water added because the mix is stiff — what do you say? When do you send a whole load back?

The answer underneath all three: you don't accept concrete by eye. Read the delivery ticket — batch time, grade, volume — against the specification's limits on time from batching and on slump. Water added on site outside what the specification and supplier allow changes the water–cement ratio, so it doesn't happen. A load outside the limits goes back and gets written down, and you don't talk yourself into it being a one-off.

Labour by trade and number, plant on site and whether it worked, weather when it mattered, work done by location, inspections and their outcome, instructions received and from whom, delays and their cause.

Then say why: when an extension of time or a variation is argued, the diary is evidence of what happened on a date. "Works ongoing" is evidence of nothing.

Neither, until the conflict is resolved in writing. That's the short answer. The long one is what gets you the job.

First, check it's real: are both drawings the current revision? A surprising number of "clashes" are an old print in the site cabin. If it is real, take it to the technical office or design manager so a formal query goes to the consultant — an RFI, or a technical query (TQ) on some jobs — with both drawings marked up at the gridline and level. Move the gang onto another area so they aren't standing. When the answer comes back, build to it and file it with the drawing.

A site engineer often doesn't write the RFI personally. You're the one who spots that it's needed. Saying so shows you know where your authority stops.

Asked in several disguises, because a bad measure is money that leaves the contractor and doesn't come back.

Measure only work that's complete and accepted, not work that's nearly there. Take it off the approved drawings and check it on site, jointly with the subcontractor's QS or foreman if you can, and get both signatures on the measurement sheet. Measure the way their subcontract says to — square metres aren't cubic metres, and whether openings are deducted depends on the method of measurement in the contract. Then the deductions: previous valuations, materials the main contractor supplied, contra-charges.

And name the boundary: the site engineer measures and evidences; the QS prices and certifies. If you've done both in a smaller firm, say so.

This is a commercial question dressed as a site one. Every change is a potential variation, and work done without a written instruction may never be paid for.

Be courteous — the client's rep isn't the enemy. Then be plain: you'll do it as soon as the instruction arrives through the route the contract sets, which on many contracts means the engineer or contract administrator, not the client's rep directly on site. Tell your project manager and commercial team the same day, and put it in the diary with the name and time. If the change touches something that's about to be cast, say that waiting has a cost too, so it gets decided quickly.

The bill is an estimate made at tender; the measure is what was built. On a remeasurable job you're paid on the measure — and a big gap on one item is something to raise, not bury.

The civil engineer page deals with what follows a failed 28-day result — cores, assessment, strengthening. This is day one, and it belongs to the site engineer.

Paper before concrete. Get the result in writing. Match the cube references to the delivery tickets and to the element they came from: same truck? Were the cubes stored and cured properly on site before collection? Then the element: mark it, and stop any striking of props beneath it or loading on top until it's understood. Then tell people — your project manager and your own quality lead, and through them the consultant, formally. Don't let the consultant find out from the lab's distribution list.

And don't make the structural call. That decision isn't yours; your job is to get it to the person whose it is, with a complete file.

Get the reasons written down — on the request form is fine — item by item. Split them into what a night shift can fix and what it can't. If it's fixable, ask the inspector for a re-inspection late tonight or first thing, after the items are actually closed. If it isn't, cancel the pour now rather than at five in the morning, because a cancelled pump and trucks cost money your project manager will want to know about.

Either way, your project manager hears it from you first.

An NCR is a document with a lifecycle, not an insult. Root cause (why, not just what), corrective action on the work, preventive action so it doesn't recur, then evidence — photos, test results, a fresh inspection request — and the close-out signature.

Add the thing people skip: open NCRs show up in monthly quality reports and can hold up later inspections. Don't let one sit for months.

Don't wait for the consultant to produce one. Walk it first, room by room in a fixed order — ceiling, walls, floor, doors and windows, services — and number every item with location, photo, responsible trade and target date.

An item is closed when you've seen it closed, not when the subcontractor says so.

A written system controlling high-risk work. HSE describes the parts: it defines the work and its hazards, confirms the precautions are in place before work starts, names who authorises it, and has a formal hand-back and cancellation when the job's done.

On site that typically means hot work, confined spaces, deep excavations, live electrical work and heavy lifts. The line that counts: a permit is signed by someone who has stood at the place and checked, not from the cabin.

Stop him first. Then the order HSE's guidance sets out: avoid work at height if you can, otherwise prevent the fall (edge protection, a working platform), otherwise minimise the distance and consequences (nets, harness). The harness is the last item, not the first.

Two hazards: the sides collapsing, and the spoil or plant going in on top of them.

One published benchmark you can quote is the US OSHA standard: a protective system — sloping, shoring or a trench box — for any excavation 5 feet (1.52 m) or deeper unless it's entirely in stable rock; spoil and equipment kept at least 2 feet (0.61 m) back from the edge; a ladder or other safe exit in trenches 4 feet deep or more, within 25 feet of lateral travel; and an inspection by a competent person before work starts. Say that you work to your project's safety plan, and that this is one reference, not every country's rule.

Stop, fully and immediately, even if you think it's overcautious. You don't argue with the gang still working.

Then get the reason exactly, in writing; tell your project manager; fix the cause, not the appearance; and ask for the lift formally from whoever imposed it. Meanwhile move the gang somewhere safe so the day isn't lost, and record the stoppage and its length in the diary.

Two halves. Concrete: night or early-morning pours, a cooled mix, curing started straight away — the civil engineer page covers the detail. Labour: some authorities impose an official midday ban on outdoor work in direct sun through the summer months (one is in the local note below, with dates), so the programme has to be built around it rather than discovered in mid-June.

Then say what you do yourself: cold water and shade on site, and keeping an eye on new arrivals who haven't acclimatised.