What You Get When You Whistle

Our fully managed sales development service includes your go to market strategy, messaging, inbound and outbound lead generation, CRM setup and support with tech stack, outreach management, and reporting. Everything is designed to grow your pipeline and help you scale revenue.
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Account Management

A dedicated manager oversees your entire outreach program, ensuring strategy alignment, consistent execution, and measurable outcomes.

SDR Team

The journey began with a focus on craft and curiosity. Early experiments, late nights, and a drive to create meaningful digital experiences shaped the foundation.

Team Leader

Your Team Leader coaches the SDRs, monitors results and activities, listens to calls and provides you with weekly deep dive reports about on the ground performance for you to act on.

Messaging & Content

We personalize your content at scale using AI and build multi-channel sequences designed to increase reply rate and drive conversations that convert into qualified meetings

Tech Stack

Access to Whistle OS, the best in class operating system for outreach based on years of testing.

Contact Data & Segmentation

We subscribe to the major databases and use our AI tools to provide validated lists based on your ICP.

Reports and insights

Track your outreach efforts in real time including insights into campaign performance by geography, titles, industry, company size and other metrics, as well as breakdowns by channels and lists.

Trusted by Growing
Revenue Teams

They Whistled. We Gave Them Pipeline. From early-stage startups to enterprises, our clients share how Whistle changed the game.

“I chose Whistle for the quality of the people. I created a spreadsheet and ranked every candidate I interviewed, and Whistle’s SDRs ranked highest. They were more knowledgeable, more personable, and a little more experienced.”
Stephan Staszewski
Head of Business Development
"Our Whistle team crush their goals every day, every month. They have an amazing attitude and willingness to be part of our team."

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David Pennington
Sales Development Leader
“We knew the type of talent Whistle had access to, and they exceeded our expectations. Their BDR has helped us expand our pipeline and given us the bandwidth to focus on what we do best—delivering value to our clients.”
Ari Barmapov
Co-Founder & Head of Business Development
“It’s been an incredibly positive experience working with Whistle. The communication is open and upfront, and I especially appreciate that the Appointment Setters are proactive and confident to test and optimize the process.”
Connor Conzelman
Former Director of Customer Success
"The Whistle team bring energy, professionalism, and a positive attitude to every meeting. The level of care and commitment is truly impressive. One of our Whistle SDRs was actually awarded the top opportunity contributor worldwide."
Karleen Hickok
Global Director, Sales Development
"Corli is the best BDR I have ever worked with. Ever. EVER. Best stats, initiative, professionalism, calling consistency, and getting it done daily. Thank you Whistle!"
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Tim Savage
Chief Executive Officer
"Whistle provided us with the structure and support we needed to make outbound a viable and repeatable part of our sales strategy. Their team was responsive, collaborative, and proactive in helping us test and learn what worked best for our audience."
Andrea Brown
VP of Marketing
"Whistle provided us with the structure and support we needed to make outbound a viable and repeatable part of our sales strategy. Their team was responsive, collaborative, and proactive in helping us test and learn what worked best for our audience."
Ron Agron
VP of Marketing
"The people at Whistle are really nice, very warm, and very friendly. It felt like working with colleagues from my own company. Every meeting was just a joy to speak with everyone."
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Ron Agron
VP of Marketing
"Whistle overhauled our pipeline, implemented and streamlined tools around RevOps, and built meaningful reports. This resulted in efficiency gains among the sales team, clean data for analytics, and increased visibility on our sales operations."
Jason Hill
Director of Software Engineering