Truecaller Tech Stack

Mobile platform for contact verification and spam blocking at global scale

Software Development Norrmalm, Stockholm County 201–500 employees Founded 2009 Privately Held

Truecaller operates a mobile-first communication platform serving over 433 million monthly users with contact verification and unwanted-call blocking. The tech stack—Android, iOS, Kafka, Cassandra, Kubernetes across GCP/AWS/Azure—reflects a distributed, multi-region infrastructure built for real-time reliability. Hiring momentum is accelerating with senior engineering and infrastructure roles dominating the pipeline, and active projects in GCP security hardening, Kubernetes optimization, and ML platforms suggest Truecaller is investing heavily in platform security and operational scale.

Tech Stack 40 technologies

Core StackKotlin AWS Kubernetes Docker Prometheus Grafana Datadog New Relic Linux Swift SwiftUI GitHub Actions Scala Java Go Cassandra Kafka Android Android SDK Excel GCP Azure AWS EKS Azure Kubernetes Service Google Cloud Logging Cocoa iOS Fastlane Git Security Command Center+5 more

What Truecaller Is Building

◆Challenges

Messaging reliability and security
Scalable real-time distributed systems
Streamlining ar processes
Scaling infrastructure to handle growth
Ensuring system availability
Reducing fraud calls
Scaling large-scale messaging
Complex infrastructure security problems
Repeating vulnerabilities
Optimizing training and deployment of ml models

▲Active Projects

Tooling for provisioning and scaling infrastructure resources
Monitoring and capacity planning
Calling platform
Android app growth
Gcp security architecture design
Edr and identity proxy deployment
Kubernetes (gke) hardening strategy
Self-serve analytics platform
Ml platforms and streaming use cases

Hiring Activity

Accelerating15 roles · 9 in 30d

Department

Engineering

Finance

Data

Sales

Security

Seniority

Senior

Mid

Director

Intern

Company intelligence

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

Get started free

About Truecaller

Truecaller is a Stockholm-based mobile platform that helps users verify contacts, block unwanted communication, and connect safely with businesses. The service reaches over 433 million people monthly through Android and iOS apps, with additional identity and fintech capabilities. The company operates a 201–500-person organization across engineering, data, finance, and sales, with active hiring in India and Sweden focused on infrastructure, backend systems, and security roles.

HeadquartersNorrmalm, Stockholm County

Company Size201–500 employees

Founded2009

Hiring MarketsIndia, Sweden

Frequently Asked Questions

What tech stack does Truecaller use?

Truecaller's stack spans Android, iOS (Kotlin, Swift), backend services in Java, Go, and Scala, data pipelines on Kafka and Cassandra, infrastructure on Kubernetes (GCP/AWS/Azure), and observability tools including Prometheus, Grafana, Datadog, and New Relic.

Is Truecaller hiring engineers?

Yes. Engineering roles dominate hiring: 9 of 16 active roles are engineering positions, with 11 filled at senior level. The company is accelerating hires and recruiting in India and Sweden.

Where is Truecaller headquartered?

Norrmalm, Stockholm County, Sweden. The company was founded in 2009 and remains privately held.