About Callstack
Callstack is a company based in Wrocław (Poland) founded in 2016 by Anna Lankauf was acquired by Viking Global Investors in July 2025.. Callstack offers products and services including Product Development, Tech Stack Upgrade, and Team Upskilling. Callstack operates in a competitive market with competitors including UST, Genpact, 1&1 IONOS, Happiest Minds and Accenture, among others.
- Headquarter Wrocław, Poland
- Founders Anna Lankauf
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Sectors
Technology
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Email
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Phone
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Website
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Social
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- Legal Name Callstack.Io Sp. Z O.O.
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Annual Revenue
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Net Profit
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Latest Funding Round
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Employee Count
Employee Count
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Acquired by
Viking Global Investors
(Jul 22, 2025)
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Products & Services of Callstack
Callstack offers a comprehensive portfolio of products and services, including Product Development, Tech Stack Upgrade, and Team Upskilling. The company's diverse product and service offerings are designed to meet the evolving needs of its customers, address market demands, and provide comprehensive solutions that drive value creation and customer satisfaction across various segments and use cases.
Assists in creating innovative software products
Upgrades technologies for improved performance and scalability
Equips developers with knowledge in modern tools and practices
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Funding Insights of Callstack
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
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| Jul, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Feb, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Jan, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Feb, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
Investors in Callstack
Callstack has secured backing from 1 investor, including venture fund investors. Prominent investors backing the company include Viking Global Investors. This diverse investor base provides strategic capital, industry expertise, and valuable network connections that support the company's growth initiatives, market expansion, and long-term value creation.
| Investor | Description | Founded Year | Domain | Location |
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Private investment firm focused on multiple sectors
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Founded Year | Domain | Location |
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Single family office of Amitabh Bachchan, founder of Amitabh Bachchan Corporation or AB CORP
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Founded Year | Domain | Location | |
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Startup ecosystems are ignited through strategic investments by Signite Partners.
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Founded Year | Domain | Location | |
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Venture capital is directed toward companies in multiple sectors.
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Founded Year | Domain | Location | |
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Venture capital is invested in cybersecurity, fintech, and AI startups.
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Founded Year | Domain | Location |
Investments & Acquisitions by Callstack
| Company Name | Description | Domain | Location | Founded Year | Amount |
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Bionic investment advisor platform
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2016 | ||||
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Fine Asian gourmet food is offered by an internet-first restaurant.
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2016 | ||||
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Physical e-commerce kiosks are deployed for rural purchases in Indonesia.
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2014 | ||||
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Fine Asian gourmet food is offered by an internet-first restaurant.
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2016 |
Financial Statements - Callstack
| Date | Amount | Transaction Name | Valuation | Lead Investors | Investors |
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| Jul, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Feb, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Jan, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
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| Feb, 2021 | Amount | Post-IPO - Grab | Valuation |
investors |
Callstack Comparisons
Competitors of Callstack
Callstack operates in a dynamic and competitive business environment, facing competition from various established players and emerging companies in the market. The competitive landscape includes prominent companies such as UST, Genpact, 1&1 IONOS, Happiest Minds and Accenture, among others. This competitive environment drives innovation, market differentiation, and strategic positioning as companies strive to capture market share and deliver value to their customers. Understanding the competitive dynamics is crucial for assessing market positioning, identifying growth opportunities, and navigating the challenges inherent in a competitive marketplace.
| Company Name | Domain | Founded year | HQ Location | Description |
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High-quality office furniture is provided by UST for various needs.
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Provider of end-to-end business process outsourcing services
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Cloud infrastructure and hosting services are provided by 1&1 IONOS.
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| domain | founded_year | HQ Location |
IT outsourcing services are delivered across multiple business lines.
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IT and management consultancy services are provided globally.
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| domain | founded_year | HQ Location |
Application development, cloud, cybersecurity, and business intelligence services are provided.
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| Company Name | Domain | Founded year | HQ Location | Description |
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Multiple services are booked via an app-based platform.
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On-demand services are booked through an app-based platform.
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App based platform offering on demand delivery and ride-hailing services
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Operates an on-demand hyperlocal delivery app for food and groceries.
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Frequently Asked Questions about Callstack
When was Callstack founded?
Callstack was founded in 2016.
Where is Callstack located?
Callstack is headquartered in Wrocław, Poland. It is registered at Wrocław, Lower Silesian Voivodeship, Poland.
Who is the current CEO of Callstack?
Krzysztof Lis is the current CEO of Callstack.
What does Callstack do?
Callstack was founded in 2016 and is headquartered in Wroclaw, Poland. Software engineering consultancy services are provided, with specialization in microfrontends, React Native, and observability. Applications are built and optimized for clients, alongside expertise in product development, growth strategies, and performance enhancements. Operations focus on delivering tailored software solutions across various organizational needs.
Who are the top competitors of Callstack?
Callstack's top competitors include Happiest Minds, Mavenir and 1&1 IONOS.
What products or services does Callstack offer?
Callstack offers Product Development, Tech Stack Upgrade, and Team Upskilling.
Who are Callstack's investors?
Callstack has 1 investor. Key investors include Viking Global Investors.
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