300Brains Tech Stack

Dedicated IT teams for legacy systems, migrations, and long-term software maintenance

IT Services and IT Consulting Warsaw, Mazowieckie 11–50 employees Founded 2019 Partnership

300Brains staffs long-term dedicated engineering teams for European enterprises managing legacy systems and migrations. The stack spans Java, .NET, Python, React, and cloud platforms (AWS, GCP, Azure), with active work on microservices, CI/CD automation, and distributed ledger platforms. The org is engineer-heavy with balanced mid/senior/lead seniority, but minimal recent hiring velocity suggests they are stabilized on current client engagements rather than scaling headcount.

Tech Stack 37 technologies

Core StackJava AWS Heroku TypeScript React Python .NET Go Redux Bootstrap Windows Server Active Directory Azure AD Intune GitHub Copilot SQL Server React Native Node.js Kotlin Docker Kubernetes SQL Spring Boot GCP Git Windows Certificate Services Teams Microsoft Teams Phone SharePoint Azure+3 more

AdoptingAWS

ReplacingJava

What 300Brains Is Building

◆Challenges

Ci/cd improvements

▲Active Projects

Backend solutions for mobile and web applications
Ci/cd pipeline automation
Database design and optimization
Greenfield project
High-performance backend systems
Distributed ledger-based platform for the insurance industry
Microservices-based backend
Ci/cd improvements

Hiring Activity

Minimal8 roles · 0 in 30d

Department

Engineering

7

Support

1

Seniority

Mid

3

Senior

3

Lead

2

Notable leadership hires: Team Lead

Company intelligence

Find more companies like 300Brains by tech stack, pain points and active projects

Get started free

About 300Brains

300Brains is a Warsaw-based IT outsourcing firm founded in 2019, operating as a partnership with 11–50 employees. They build and manage dedicated software teams embedded within client organizations—handling legacy system maintenance, cloud migrations, integrations with third-party platforms, and new-build projects. Unlike body-leasing models, their teams stay with a single client for the contract duration, operating under direct client management with payroll cost savings as the primary value proposition. Current work spans backend systems for mobile/web, CI/CD infrastructure, database optimization, and emerging areas like distributed ledger platforms for insurance.

HeadquartersWarsaw, Mazowieckie

Company Size11–50 employees

Founded2019

Hiring MarketsPoland

Frequently Asked Questions

What tech stack does 300Brains use?

Java, .NET, Python, TypeScript, React, Node.js, Spring Boot, SQL (MySQL, PostgreSQL, SQL Server, Oracle), AWS, GCP, Azure, Docker, Kubernetes, GitHub Copilot, and Microsoft enterprise tools (Teams, SharePoint, Active Directory).

Where is 300Brains headquartered?

Warsaw, Poland. All active hiring is in Poland; the firm was founded in 2019 and operates as a partnership with 11–50 employees.

What projects is 300Brains currently working on?

Backend systems for mobile and web applications, CI/CD pipeline automation and improvements, database design and optimization, greenfield development, microservices architectures, high-performance backend systems, and a distributed ledger-based platform for the insurance industry.