An SDR (sales development representative) is the entry-level role at the top of the B2B revenue funnel. They are responsible for one thing: filling the top of the pipeline with qualified meetings from the demand the company already has. Where a BDR builds a pipeline from zero by cold-opening net-new markets, the SDR works the demand that already walked in — inbound leads, content downloads, demo requests, and existing accounts — and turns it into qualified meetings for an account executive. Everything else — discovery calls, proposals, negotiating, closing — belongs to other people. Understanding this single boundary is the difference between a job you survive and a career you build.
What an SDR actually does all day
The day-to-day splits into three blocks of work: inbound qualification, existing-account outreach, and meeting logistics.
Inbound is the core of it. A lead fills a form, downloads a guide, or requests a demo — the demand came in on its own. Your job is to reach it fast, qualify it with a handful of discovery questions, and move the strong ones to a meeting with an account executive. Speed is the SDR metric: a lead that sits for hours is a lead going cold.
SDRs also run outbound-style touches — but into accounts the company already works, never net-new cold markets. That is re-engagement and expansion-adjacent work: personalising outreach to people in your existing book of business, and following up on anything that moved. Opening a brand-new territory from zero is the BDR's job. If the role you are applying for expects you to cold-prospect net-new logos, you are really applying for a BDR seat.
Meeting logistics are the unglamorous 20%: confirming the call, sending the calendar invite, attaching the right materials, and handing the context to the AE so they do not walk in cold.
What an SDR is not
The most common misconception is that an SDR is a mini-closer. They are not. An SDR's objective is a qualified meeting in the AE's calendar, not a signed deal. If you hear yourself pitching the full product and quoting pricing on your first call, you have already drifted outside the role.
The distinction matters for your earnings, too. Closers are paid on commission attached to revenue; SDRs are paid on activity and meetings, with a smaller variable component. Understanding this going in saves you from rage-quitting three months in because your comp is "low."
The activities that actually move the number
If you boil the role to its measurable inputs, four activities predict most of your outcomes:
- Delivered touches per day — the total emails, calls, and social touches that land. This is the lever you control directly.
- Positive replies — not opens, not clicks. Replies.
- Qualified meetings booked — the number that matters to leadership.
- Show rate — how many booked meetings actually happen. This is where your follow-through is tested.
Most SDR teams track these in a simple CRM pipeline. If a role does not track at least the first and third, you have no way to know if you are improving — which is itself a red flag about the employer.
A realistic day on the clock
A good day is not glamorous. It is a morning block of 60–90 minutes of uninterrupted inbound follow-up and existing-account outreach, a midday wave of call-backs timed to when buyers actually answer, and an afternoon spent following up on anything that moved. The best SDRs protect a "deep work" block the way sales managers protect revenue — because the list-building and research that feel like busywork are the reason your touches actually land.
Is being an SDR worth it?
For most people who want a sales career, yes — because it is the cleanest on-ramp that requires no prior closing experience and no degree. It is a learnable craft: research, relevance, follow-through. It teaches you the exact skills the next role up — account executive — tests for, which is why the AE path from SDR is the most common promotion in sales.
It is also honest work with a real tradeoff: rejection density is high, and your compensation in year one is largely OTE (on-target earnings) rather than guaranteed. Go in with your eyes open, run the activities, and the role becomes the single fastest way to a quota-carrying job.
The SDR daily routine checklist
Here is the checklist the best SDRs I have seen run every day. It is not a script — it is the operating system the scripts live on.
Before anything else (15 min)
- Pull up yesterday's replies and follow up within 60 minutes of open
- Pick today's 20 contacts: fresh inbound leads plus your existing book
- Load 1–2 named contacts per account into your sequence tool
Reach-out block (60–90 min, no distractions)
- Send 30–40 personalised emails — inbound follow-ups and existing-account touches (batch in 10s)
- Leave 10–15 voicemails on the accounts you emailed first
- Log every touch in the CRM as it happens, not at the end
Call wave (30–45 min, timed to buyer behaviour)
- Call the 25 contacts most likely to answer right now
- For anyone who picks up: 3 qualifying questions, then book or disqualify
- No pitch. The meeting is the deliverable.
Inbound queue (30 min)
- Reach every new lead within 5 minutes
- Qualify with 5 questions: problem, budget, authority, timeline, fit
- Route the qualified ones to an AE with a 3-line handoff note
End of day (15 min)
- Book meetings confirmed, rescheduled, or sent to the AE
- Update every pipeline stage — no "next step: call them later"
- Write one line of learning: what worked today, what did not
Done = 40+ touches, every follow-up answered, 1–2 qualified meetings booked.
Start here
Your first move is not to memorise a script. It is to decide whether the activity load and the meeting-based definition of success fit you. If they do, the next lesson introduces the BDR — the close cousin that's often used interchangeably with SDR. Knowing which one you are actually applying for changes your interview answers.