I

ista Tech Stack

Building management software for energy efficiency and carbon reduction

IT Services and IT Consulting Essen, Nordrhein-Westfalen 5,001–10,000 employees Founded 1902 Public Company

ista operates a 120-year-old building technology company serving 14+ million properties across 20 countries. The organization is scaling security and identity infrastructure—9 of the last 21 open roles are engineering positions, with 3 dedicated security hires—while adopting GPT and GitHub Copilot. Pain points center on technical debt (email delivery failures, legacy telephony, test environment sprawl) and multi-country operational complexity, suggesting a business in transition from monolithic systems toward cloud-native identity and AI-assisted workflows.

Tech Stack 42 technologies

Core StackAzure AD Java JUnit Selenium Jenkins GitLab CI/CD GitHub Actions Azure DevOps Playwright Cypress Python JavaScript PostgreSQL Kubernetes Angular GitHub Copilot LangChain Keycloak OAuth 2.0 SAML OpenID Connect JWT SCIM Excel PowerPoint Spring Boot Git GPT LangGraph Haystack+12 more

AdoptingGitHub Copilot GPT

What ista Is Building

◆Challenges

Technical issues with automated email delivery
Technical issues with email notifications
Email notification delivery issues
Securing digital identities
Ticket processing inefficiencies
Inefficient test environment management
Lack of test data provisioning
Agent performance issues
Modernizing legacy telephony
Multi-country rollout

▲Active Projects

Security awareness training
Application onboarding to iam platforms
Transfer pricing initiatives
Iam best practices shaping
Bid strategy development
Tool development for large customer sales
Verrechnungspreisthemen
Akquisitionen
Ifrs-konzernabschluss
Isms improvement

Hiring Activity

Steady20 roles · 9 in 30d

Department

Engineering

9

Security

3

Finance

2

Sales

2

Data

1

HR

1

Marketing

1

Ops

1

Seniority

Senior

11

Manager

5

Lead

3

Mid

2

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About ista

ista develops software and IoT systems that measure, manage, and optimize energy consumption in residential and commercial buildings. The platform spans data collection (over 45 million connected devices globally), billing integration, submetering, and smart building controls—all aimed at reducing carbon emissions and improving occupant comfort. The company operates at scale: 6,300+ employees, 460,000+ customers, 14+ million properties served, with presence across 20 countries. Revenue reached €1.22 billion in 2024. Products and services are sold to building owners and property managers seeking to modernize aging infrastructure and meet sustainability mandates.

HeadquartersEssen, Nordrhein-Westfalen

Company Size5,001–10,000 employees

Founded1902

Hiring MarketsGermany

Frequently Asked Questions

What is ista's tech stack?

Core: Java, Spring Boot, PostgreSQL, Kubernetes, Angular. Identity: Keycloak, Azure AD, OAuth 2.0, SAML, OpenID Connect. Testing: Selenium, Cypress, Playwright, JUnit. CI/CD: Jenkins, GitLab CI/CD, GitHub Actions, Azure DevOps. Now adopting GPT and GitHub Copilot for development.