A1 Bulgaria Tech Stack

Eastern European telecom operator with 4.8M customers across mobile, broadband, and digital services

Telecommunications Sofia, Sofia 1,001–5,000 employees Founded 1994 Privately Held

A1 Bulgaria operates a full-stack telecom business—mobile networks (4G/5G), fixed broadband, IPTV, and business solutions—serving 4.8M customers from a 21,000+ km fiber backbone. The tech stack signals dual operating modes: Android/Kotlin/GraphQL for consumer mobile and TV apps, paired with enterprise infrastructure (Azure, AWS, Tibco, Okta) for B2B IoT, cloud, and payment services. Active hiring momentum (46 roles in 30 days) concentrates in engineering and sales, with notable security expansion, reflecting near-term priorities in NIS2 compliance, data warehouse modernization, and operational automation.

Tech Stack 177 technologies

Core StackJava Kotlin GraphQL Python Linux AWS Azure AD Okta Go MariaDB RxJava Dagger Retrofit Glide Android Android TV Tibco BusinessWorks TIBCO EMS GitOps SQL Azure Exoscale Azure Key Vault GCP Windows Active Directory Federation Services Google Identity Ping Identity PowerShell Bash+141 more

AdoptingPower Platform RPA

What A1 Bulgaria Is Building

◆Challenges

Ensuring compliance with nis2
Optimizing network links
Scalability and reliability of data infrastructure
Process automation needs
Inefficient business processes
Improving soc workflows
Modernizing corporate data warehouse
Gap management
Ensuring availability, stability, performance
Automation of operations

▲Active Projects

Automation solution development
Smarttv android application development
Assurance metrics and dashboards
Supply chain risk management activities
Modernizing corporate data warehouse system
Data pipeline development
International design projects
Eol upgrades and platform migrations
Operational risk management framework development
Playbook development

Hiring Activity

Accelerating100 roles · 45 in 30d

Department

Engineering

Sales

Security

Data

Ops

Finance

Support

Seniority

Mid

Junior

Senior

Intern

Lead

Manager

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About A1 Bulgaria

A1 Bulgaria is the leading communications and digital services provider in the country, operating mobile and fixed networks, high-speed broadband, satellite and interactive TV (including four proprietary sports channels), payment services, and ICT/cloud/IoT solutions for enterprise customers. The company serves 4.8M subscribers through approximately 3,600 employees and operates its own fiber network spanning 73 cities and 133 smaller towns. A1 Bulgaria is part of the A1 Group, a multinational telecom operator with over 26M customers across 7 Central and Eastern European countries. Revenue and profitability are tied to network infrastructure (capex-intensive), subscriber churn, and enterprise contract value across consumer and B2B segments.

HeadquartersSofia, Sofia

Company Size1,001–5,000 employees

Founded1994

Hiring MarketsBulgaria

Frequently Asked Questions

What tech stack does A1 Bulgaria use?

A1 Bulgaria runs Java, Kotlin, GraphQL, and Android/Android TV for consumer apps; Tibco BusinessWorks and TIBCO EMS for enterprise messaging; Azure, AWS, GCP for cloud; Okta and Azure AD for identity; Python, Go, Linux, SQL for backend services.

What is A1 Bulgaria working on?

Active projects include SmartTV Android app development, data warehouse modernization, data pipeline and automation solution development, NIS2 compliance initiatives, supply chain risk management, SOC workflow improvements, and platform migrations and end-of-life upgrades.