BDR vs SDR vs AE: What's the Actual Difference for B2B SaaS

You'll see job postings for BDRs, SDRs, AEs, AMs, ADRs, MDRs, and inside sales reps. Most of these terms get used interchangeably. Some are genuinely different roles. Some are the same job with different titles depending on the company.

Here's the actual breakdown. The framework that matters: pipeline generation vs deal closing. Once you know which side of that line a role sits on, the title matters less.

The TL;DR

• BDR (Business Development Representative) generates pipeline through outbound. Cold calls, cold emails, LinkedIn. Targets cold accounts that fit the ICP.
• SDR (Sales Development Representative) generates pipeline mostly through inbound. Responds to leads from marketing, qualifies them, books meetings for AEs.
• AE (Account Executive) closes deals. Takes qualified meetings from BDRs and SDRs (or generates their own in full-cycle motions) and runs the sales process through to close.
• AM (Account Manager) manages existing customers post-sale. Renewals, expansion, retention.

At many B2B SaaS companies, BDR and SDR are used interchangeably. The distinction (BDR = outbound, SDR = inbound) is the most common convention, but it's not universal. Always check the job description, not the title.

What a BDR actually does

A BDR's job is to generate net-new pipeline by reaching out to companies that have never expressed interest.

Daily activity for a velocity SaaS BDR looks like:

• 50 to 80 cold calls
• 50 to 100 cold emails
• 20 to 40 LinkedIn touches
• 5 to 10 outbound sequences started per week
• Goal: 8 to 15 qualified meetings booked per month

BDRs are typically early-career (0 to 3 years of sales experience). Comp is base + variable, usually $50K-$70K base, $20K-$40K variable, total OTE $70K-$110K depending on geography and product complexity.

The role is high-activity, high-volume. Burnout risk is real if managers don't separate "activity inputs" from "outcomes." Good BDR managers coach to activity quality, not just quantity.

What an SDR actually does

An SDR's job is to qualify and route inbound leads to AEs.

Daily activity looks like:

• Respond to inbound leads within 5 minutes during business hours
• 30 to 50 follow-up emails on prior inbound leads
• Discovery calls (typically 15-20 min) to qualify leads against the ICP rubric
• Book qualified meetings for AEs
• Goal: 12 to 25 qualified meetings booked per month (higher than BDR because the leads are warmer)

Comp is similar to BDR. Some companies pay SDRs slightly less because the leads are warmer (less skill required to convert). Others pay equally because the quality of qualification matters more than the source of the lead.

What an AE actually does

An AE closes deals. They run discovery calls, demos, technical reviews, pricing negotiations, and contract negotiations.

Daily activity for a velocity SaaS AE:

• 5 to 10 demos per week
• 10 to 20 prospect calls (discovery, follow-up, close conversations)
• Email follow-up on active deals
• Sometimes outbound on strategic targets (varies by motion)
• Goal: $700K to $900K annual ARR closed for first-year AE; $1M+ for senior

AE comp is the largest in the sales org: $70K-$90K base, $70K-$90K variable, OTE $140K-$180K for first-year reps. Senior AEs $250K+ OTE. (Read more: The First AE Hire.)

Side-by-side comparison

The split vs full-cycle decision

Two structural choices for a velocity sales team:

Split motion: BDR/SDR books meetings, AE runs the deal. Specialization. Each role gets really good at their narrow job. Comp aligns to the right metric. Downside: handoffs lose information, and a poorly-aligned BDR/AE pair creates pipeline that doesn't close.

Full-cycle motion: One rep does everything from cold outreach through close. Often called "AE" but functionally a hybrid. Pros: no handoff loss, each rep owns their pipeline from end to end. Cons: hard to find people who are great at both prospecting and closing. Most velocity teams under 5 reps run full-cycle by necessity.

For a B2B SaaS at 0-5 reps, full-cycle is almost always right. The volume of inbound usually isn't high enough yet to justify a dedicated SDR layer, and the volume of outbound work doesn't yet require a dedicated BDR. As the team grows past 5-8 AEs, the split motion starts to pay off because specialization compounds.

When to hire your first BDR or SDR

A few signals you're ready:

• Your AEs are spending 30%+ of their time on prospecting and missing closing opportunities
• Inbound lead volume is growing past what AEs can respond to within 10 minutes
• You have 2-3 AEs hitting quota and the constraint is pipeline coverage, not closing
• The ICP is clear enough that a BDR can be trained to target it without senior judgment

If any of these are true, the next hire should probably be a pipeline generator. If none are true, hire another AE first.

The trap most early teams fall into

Hiring SDRs or BDRs before you have a documented playbook. The pipeline generators sit at the top of the funnel. If they don't know your ICP, your messaging, your qualifying criteria, and your handoff process, they generate junk pipeline. AEs spend their time disqualifying meetings instead of closing. Everyone's frustrated.

Build the playbook first. Then hire pipeline generators into a system that works. (Read more: When to Stop Selling as Founder.)

What about other titles?

Quick translation guide for less common roles you'll see:

• ADR (Account Development Rep) = same as BDR, alternate term.
• MDR (Market Development Rep) = SDR specifically focused on top-of-funnel marketing-sourced leads.
• Inside Sales Rep (ISR) = AE in a full-cycle motion, often used for SMB segments.
• RDR (Renewal Development Rep) = AM-adjacent role specifically focused on contract renewals.
• Sales Engineer (SE) = technical pre-sales specialist who supports AEs on demos for technical buyers. Not a quota-carrying closer.

How SAILS thinks about team structure

The Build phase of the SAILS engagement produces an org structure recommendation specific to your stage and motion. We look at lead volume, deal size, cycle length, and your existing team's strengths to recommend the right structure for the next 12-18 months. Sometimes that's full-cycle. Sometimes it's a split motion. Sometimes it's a hybrid that evolves as the company grows.