Square21

square21.tech

Budapest, Budapest, Hungary

1-10 employees

LinkedIn Profile

About Square21

web development, software development, mobile app development, nodejs, javascript, react, react native, native ios, android, vuejs, c, python, fintech, healthcare app development, scalable solutions, custom cms, medtech, agile methodologies, hospitality booking systems, end-to-end delivery

Square21's Tech Stack

7 technologies detected · 2 decision makers · Emails available

Sales Outreach Angle

React-based front-ends indicate a modern web engineering stack. Developer tools, component libraries, testing frameworks, and design systems are relevant sales angles.

Square21's Position in the StackWho Database

• Square21 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).
• 1,638 companies in Budapest are in the StackWho database.
• 97,391 information technology & services companies are in the 1-10 employee range (same size as Square21).

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

Frequently Asked Questions

What technology does Square21 use?

Square21 uses Gmail, Google Apps, Microsoft Office 365, Mobile Friendly, Xamarin, React Native, and 1 more technologies. This data is sourced from StackWho's technology detection engine.

How do I contact the decision makers at Square21?

StackWho has verified email addresses for 2 decision makers at Square21. Pro members can access direct emails for the CEO, CTO, VP of Engineering, and other key contacts. Use StackWho to reach Square21 directly for sales, recruiting, or partnerships.

What industry is Square21 in?

Square21 operates in the information technology & services industry, headquartered in Budapest, Budapest, Hungary. StackWho tracks technology stacks and decision maker contacts for companies across all industries.

Can I export Square21's contact data?

Yes. StackWho Pro members can export decision maker contact data for Square21 and similar companies to CSV. Use the export feature to build targeted prospect lists segmented by technology stack, industry, or location.