Fully Managed

SDR Service
For oneflo

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 oneflo that we've helped

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

Sensi AI

HealthTech

We helped Sensi AI schedule over 69 meetings and close $117,000 in new opportunities.

View Case Study

MoleMap

HealthTech/Healthcare

We helped MoleMap schedule over 162 meetings and close $220,000 in new opportunities.

View Case Study

Investment

Your Package

1 FTE SDR
$6,000/ month

$6,000 per FTE SDR / month

+ $100 per Held Meeting with your ICP
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
+
10-Day Setup

& Onboarding

$5,000one-off

one-time fee

Email and LinkedIn infrastructure
List building & data segmentation
Message creation
WhistleOS setup
Strategy development
SDR training
10-day setup

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