Onoff Tech Stack

Multi-number mobile app and business fleet-management platform

Telecommunications Paris, Île-de-France 51–200 employees Founded 2014 Privately Held

OnOff operates a dual-product mobile business: a consumer app enabling multiple phone numbers on a single SIM card across 30+ countries, and a B2B fleet-management solution for assigning professional lines to employee smartphones. The tech stack (AWS, Kubernetes, MySQL, Python) and active project list—infrastructure-as-code automation, interconnect routing upgrades, and new numbering-range deployments—reveal a company scaling global telecom infrastructure while managing carrier integrations; the pain-point cluster around cost efficiency and performance under load suggests margin pressure as they expand geographically.

Tech Stack 12 technologies

Core StackAWS Kubernetes MySQL Python GitHub GitHub Actions Prometheus Grafana HubSpot Bash Lemlist LinkedIn Sales Navigator

What Onoff Is Building

◆Challenges

Scaling infrastructure for global expansion
Scaling consumer monetization
Service quality and reliability
Regulatory compliance across markets
Performance of interconnections
Cost efficiency
Performance under high loads
Cost-efficient infrastructure
Infrastructure cost optimisation
Scaling growth

▲Active Projects

Scalable aws and kubernetes environments
Monitoring and incident management
Onoff mobile launch
Interconnect or routing upgrades
Deploying new numbering ranges
Implementing iac and automation
Iac implementation
Infrastructure as code automation workflows
Integration projects with operators and numbering providers
Build onoff’s growth engine

Hiring Activity

Accelerating10 roles · 5 in 30d

Department

Engineering

Marketing

Ops

Sales

Support

Seniority

Senior

Lead

Mid

C-Level

Junior

Notable leadership hires: Head Marketing

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About Onoff

OnOff, founded in 2014 and based in Paris with an engineering hub in Tallinn, develops a mobile platform that solves a core telecom UX problem: running multiple phone numbers on a single device without switching SIMs. The consumer product now covers call routing to nearly 150 destinations. Their B2B offering, OnOff Business, streamlines corporate mobile management by assigning professional lines directly to employee devices, positioning them between carriers and enterprise IT. The org is small (51–200 employees) and engineering-forward, with active hiring across infrastructure, marketing, and sales functions.

HeadquartersParis, Île-de-France

Company Size51–200 employees

Founded2014

Hiring MarketsEstonia, France

Frequently Asked Questions

What tech stack does OnOff use?

AWS, Kubernetes, MySQL, Python, GitHub, and GitHub Actions for CI/CD. Prometheus and Grafana handle monitoring. HubSpot and Lemlist power GTM operations.

What countries does OnOff operate in?

The mobile app supports numbers from 30+ countries and calling to nearly 150 destinations. OnOff hires in Estonia and France; headquartered in Paris.