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Senior Java Developer

Onoff • Telecommunications • Java • 2 days ago

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Hybrid (Tallinn, Estonia)

Seniority

Senior

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Full-Time

Confirmed on the employer's own hiring board on Oct 9, 2026. First seen by Alion on Sep 8, 2026.

Overview

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Profile match

Onoff

Onoff lets users add extra phone numbers to a single handset through a software SIM, separating professional and private life. Its business version gives companies managed second lines for employees without extra hardware. The company is headquartered in Paris.

onoff.app • HQ: Paris, France • Unified Communications • Consumer & Utility Software • Est. 2014

Backed by LeanSquare

Join Onoff, a fast-growing telecom SaaS company, as a Senior Java Developer. In this role, you'll influence architecture, mentor other engineers, and take ownership of systems that power global communication. Enjoy a hybrid work environment, competitive compensation, extra time off, a private health plan, a travel budget, and continuous learning opportunities.

Missions

Designing and building scalable backend services for a global communication platform.
Driving architectural decisions and continuously improving systems.
Mentoring other developers through code reviews, technical discussions, and everyday collaboration.

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