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Callstack

Company profile · headcount, org chart & B2B contacts

10 Decision makers
+2 New (6 months)
500 Employees
2016 Founded

Organizational Chart of Callstack

Roles identified within Callstack's leadership team, based on public professional data.

Department

Callstack's Full Organizational Chart

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Job title Department People Action

Decision-maker contacts at Callstack

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Decision makers at Callstack

10 identified 4 C-Level 6 Directors +2 new (6 months)
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Latest news at Callstack

  1. Appointment

    New Co-founder & CEO appointed — General management

  2. Appointment

    New Head of Growth appointed — Marketing

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Funding

Last round Private equity
Private Equity Round N/A Jul 2025

Team Structure headcount by department

Technical
129
Project Management
14
HR
13
Sales
10
Other
8
Marketing
6
Finance
5
Design
3

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About Callstack

Callstack is a IT Services and IT Consulting company, operating from Poland. The company was founded in 2016 and has a workforce of roughly 500 people. Callstack belongs to the Professional Services sector, with a specific positioning on IT Services and IT Consulting. Callstack is a B2B company, primarily serving business clients and professional organisations. To date, Callstack has completed 1 funding round. Use this page to review Callstack's industry, headcount, location and hiring signals, and to reach verified B2B contacts before your next outreach.

Activity & Market

Callstack is positioned on the IT Services and IT Consulting segment, within the Professional Services sector. As a B2B company, Callstack primarily serves business clients and professional organisations. The company is categorised as “Privately held”.

How to prospect Callstack's departments

Technical

The company's largest department, with 129 people. Technical teams verify claims: public docs, a sandbox or a free tier will do the selling for you.

Project Management

With 14 people, this is the organisation's second pillar. Methodology debates are constant here: anchor your pitch in their existing framework rather than against it.

HR

This department counts 13 people. Recruitment efficiency, onboarding and retention are the priorities to anchor your outreach on.

Sales

10 people work in this department. Talk numbers (conversion, cycle length, pipeline coverage) and you will get their attention quickly.

Other

A team of 8 people. Hard to read from the outside: use a first exchange to map who does what before pushing an offer.

Marketing

This department counts 6 people. Marketers appreciate craft: a personalised, well-executed approach is itself proof of what you sell.

FAQ Callstack

What industry does Callstack operate in?

Callstack operates in the IT Services and IT Consulting industry, specifically in the Professional Services category.

How many employees does Callstack have?

Callstack has approximately 500 employees (in the 201-500 range). This figure is an estimate to help qualify the account, not a legally certified number.

How do I find contacts at Callstack?

Zeliq lets you identify decision makers at Callstack, enrich their professional contact details (verified emails and direct phone numbers), and launch targeted multichannel prospecting sequences.

Where is Callstack headquartered?

Callstack is headquartered in Poland.

What is the organizational chart of Callstack?

Roles identified within Callstack's organization include CEO, CFO, Director of Engineering, Head of Technology, HR Business Partner, Technical Quality Lead. With Zeliq, you can enrich each of these roles with verified emails and direct phone numbers.

Which decision makers recently joined Callstack?

Recent leadership arrivals at Callstack include Co-founder & CEO, Head of Growth. A new decision maker's first months are the best window to reach out; find their verified email and phone on Zeliq.

Why use this data before prospecting Callstack?

Industry, headcount and business signals give you the context to qualify Callstack, tailor your messaging, and focus your effort on the right decision makers.