Callstack

callstack.com

information technology & services

callstack.com

Wroclaw, Wojewodztwo dolnoslaskie, Poland

51-200 employees

50000000 revenue

LinkedIn Profile

About Callstack

reactjs, react native, javascript, nodejs, nextjs, education, software, health & wellness, entertainment industry, information technology, it services & it consulting, native modules development, react native app scaling, module federation development, react native training, consulting, react native consulting, services, information technology and services, react native platform-specific optimization

Callstack's Tech Stack

Decision Makers at Callstack

3 contacts

Mike Grabowski

Co-Founder & Chief Technology Officer

m***@callstack.com Sign up to view

Jakub Klobus

Engineering Manager

j***@callstack.com Sign up to view

Rafal Zakrzewski

Engineering Manager

r***@callstack.com Sign up to view

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33 technologies detected · 3 decision makers · Emails available

Sales Outreach Angle

HubSpot users typically run inbound-led sales motions. Products that integrate with HubSpot (email automation, CRM enrichment, ABM platforms) are natural fits.

Callstack's Position in the StackWho Database

• Callstack is 1 of 194,140 information technology & services companies tracked in StackWho.
• 193,618 information technology & services companies in our database have verified decision-maker emails (100% of the cohort).
• 448 companies in Wojewodztwo dolnoslaskie are in the StackWho database.
• 13,765 information technology & services companies are in the 51-200 employee range (same size as Callstack).

Technology detection from public web signals. Decision-maker contacts compiled from LinkedIn public profiles, company filings, and verified outbound testing. Methodology & sources · Updated July 2026.

Frequently Asked Questions

What technology does Callstack use?

Callstack uses Cloudflare DNS, Gmail, Google Apps, Amazon AWS, CloudFlare Hosting, Hubspot, and 27 more technologies. This data is sourced from StackWho's technology detection engine.

How do I contact the decision makers at Callstack?

StackWho has verified email addresses for 3 decision makers at Callstack. Pro members can access direct emails for the CEO, CTO, VP of Engineering, and other key contacts. Use StackWho to reach Callstack directly for sales, recruiting, or partnerships.

What industry is Callstack in?

Callstack operates in the information technology & services industry, headquartered in Wroclaw, Wojewodztwo dolnoslaskie, Poland. StackWho tracks technology stacks and decision maker contacts for companies across all industries.

Can I export Callstack's contact data?

Yes. StackWho Pro members can export decision maker contact data for Callstack and similar companies to CSV. Use the export feature to build targeted prospect lists segmented by technology stack, industry, or location.