Fully Managed

SDR Service
For rezStream

Finding customers is the hardest problem in business. And we've solved it. Thousands of times.

Clutch 4.9 Rating
HubSpot Partner Review 5.0 Rating
G2 4.9 Rating
350+
B2B Tech Companies Served
$2B+
In Funding Secured
$16.67M+
Monthly Pipeline Generated
5 yrs+
Avg SDR Experience
WIX
Intel
Zendesk
Wellness
RingCentral
Aironworks
EBSCO
Adaptive Shield
Alb
Acclym
AccessiBe
Afimag
Ministry
Paloalto
Air
7taps
WIX
Intel
Zendesk
Wellness
RingCentral
Aironworks
EBSCO
Adaptive Shield
Alb
Acclym
AccessiBe
Afimag
Ministry
Paloalto
Air
7taps

Our Mission

Maximize the success trajectory of fast-growing companies

We help companies build predictable pipeline with fully-managed sales development services as well as offshoring of our highly sought-after SDRs.

From seed-stage startups to Series F enterprises
Helped companies find their first 100 customers
Exceed revenue targets and expand into new markets
Fully-managed or offshore SDR models available

THE TEAM

Your Dedicated Outbound Team

Get a fully-managed team of outbound specialists. Each one focused on filling your pipeline with qualified opportunities.

SDR
Data Researcher
Content Writer
Customer Success Manager
Key Account Team Leader

Activity Comparison

In-house SDR vs. WhistleOS Team

MetricIn-House SDRWhistleOS Team
Daily Calls42200–400
Monthly Contacts Reached100–150400+
Support Roles1 person5 specialists + WhistleOS
Reporting & OptimizationManualAutomated & bi-weekly

How it works

WhistleOS

A complete, performance-driven outbound sales development unit — combining people, process, and technology into one system built for results.

Step 1 · Company Sourcing
Company Sourcing
These databases allow us to source lists of companies using lookalike modeling, complementary tech stacks, and ICP-based filtering.
Ocean.io
Clay
LinkedIn SN
Apollo
FullEnrich
Step 2 · Contact Enrichment
Contact Enrichment
These databases provide pre-validated emails, LinkedIn URLs and phone numbers, using a waterfall approach.
Findymail
FullEnrich
Clay
Data ExpertHuman Verification
WhistleOS
SDR Team
Customer Success Manager
Key Account Team Leader
Email Expert
Content Writer
WhistleOS Stack
LinkedIn
Instantly
Orum
Meetings
Qualified sales meetings booked and confirmed with high-fit target accounts.
Key Learnings
Validated insights on ICP fit, messaging performance, and live market signals.
Data & Reports
Enriched prospect data and performance dashboards delivered every cycle.
Refined Strategy
An updated GTM playbook driven by real performance data and field feedback.

Full Transparency

Real-Time Reporting

Every call, every email, every meeting — tracked, measured, and optimized. Complete visibility into your outbound engine.

Social Proof

Companies similar to rezStream that we've helped

Real results from real companies — similar to yours — that trusted Whistle to build their pipeline.

Rezdy

Rezdy

TravelTech / Booking Software

Direct industry alignment in TravelTech/Booking Software selling into similar target customers

Campaign TypeInbound and Outbound
Campaign Duration9 months
473
Meetings Booked
$6.6M
Pipeline Generated
53X
Estimated SQL ROI
View Case Study →
Obee

Obee

HospitalityTech / Restaurant SaaS

Direct alignment in HospitalityTech/Restaurant SaaS targeting similar hospitality stakeholders.

Target IndustryHospitality
Target PersonaOwners and General Managers
24
Meetings Booked
$340K
Pipeline Generated
11X
Estimated SQL ROI
View Case Study →
Setpoint

Setpoint

ClimateTech

Shares significant overlap in the Hospitality industry and target persona base.

Campaign TypeOutbound
Target IndustryHotels and Hospitality
Campaign Duration12 Months
130
Meetings Booked
$1.8M
Pipeline Generated
14X
Estimated SQL ROI
View Case Study →

Projections

12 Month Projections

Meetings Scheduled
120
ICP Meetings Held
84
Opportunities
67
$268,000
Closed Won
20
$80,000

Based on industry benchmarks and your average close rate: 70% ICP held rate, 80% opportunity conversion, 30% close rate.

2.7XROI
Projected

ROI is based on opportunities created

Investment

Your Package

A 26-week engagement

Your Quote
1 FTE SDR
$7,000/ month
$7,000 per FTE SDR / month
+ $5,000 setup fee (one-off)
+ $100 per Held Meeting
1 FTE SDR (Mon-Fri) — phone, email & LinkedIn
400 verified contacts per month
Up to 400 LinkedIn connection requests per month
Up to 2,000 calls per month
Up to 1,200 emails per month
2 custom sequences per ICP, refreshed monthly
Customer Success Manager & Team Leader
Live reporting
Bi-weekly meetings, instant comms & project management
Lead qualification & scheduling
SDR training & strategy development
15% off / SDR
2 FTE SDRs
$12,600/ month
$6,300 per FTE SDR / month
+ $5,000 setup fee (one-off)
+ $100 per Held Meeting
2 FTE SDRs (Mon-Fri) — phone, email & LinkedIn
800 verified contacts per month
Up to 800 LinkedIn connection requests per month
Up to 4,000 calls per month
Up to 2,400 emails per month
2 custom sequences per ICP, refreshed monthly
Customer Success Manager & Team Leader
Live reporting
Bi-weekly meetings, instant comms & project management
Lead qualification & scheduling
SDR training & strategy development

Please note:
- the number of LinkedIn connection requests, calls and emails mentioned above is an estimate and varies across each campaign.
- FTE: Full Time Equivalent, based on the average output of a full time SDR

Getting Started

Launch Timeline

From kickoff to booked meetings in under three weeks.

1
Week 1
Setup & Strategy
  • Kickoff & Onboarding
  • Strategy & ICP Meeting
  • SDR orientation session
  • WhistleOS Setup
2
Week 2
Final Preparations
  • SDR Training (Daily, Internal)
  • Final preparation & setup
  • Message creation finalized
  • List building complete
3
Week 3+
Launch 🚀
  • Multichannel outreach begins
  • Access live reports
  • Bi-weekly client reviews
  • Continuous optimization

collaboration

What We Need From You

Strong collaboration starts with the right foundations. Here's what helps us hit the ground running and get results faster.

1

Point of Contact

A dedicated POC on your side for SDR and operational support.

2

Digital Presence

A website, at least 5 strong case studies, and a calendar link for the sales team.

3

Communication

Add us to your preferred communication channel (Slack, Teams, etc.). We'll use Asana for project management.

4

Onboarding

Complete onboarding forms, meet our team, set up LinkedIn Sales Navigator & integrate your LinkedIn profile with our outreach tools.

5

Collaboration

Treat us as if you've hired us. The closer we work together, the better the results.

Ready to increase your sales?

Chat to your Whistle rep about getting started.

Book Follow Up Call

www.whistle.ltd