Company Summary

Company Overviews

At OnOff, our goal is to reinvent the user experience in the world of telecommunications.

We are a team based in Paris and Tallinn, made up of 100 passionate people from around the globe.

In 2014, we launched the first version of a mobile app that finally allowed multiple phone numbers on a single device with the same SIM card. Since then, we’ve added numbers from more than 30 countries, as well as calling capabilities to nearly 150 destinations.

We’re also very proud of our “Onoff Business” solution, which streamlines fleet management by assigning professional lines directly to your employees’ smartphones.

Rating Reviews

Rating is calculated based on 3 reviews and is evolving.

Featured Reviews

Software Engineer
3.9
26 September 2026
Engaging tech work with potential for process improvement
Pros: The core work on Onoff's platform is genuinely interesting, offering ample opportunity to solve complex problems in the mobile communication tech industry. The team is full of smart, driven individuals, and collaboration is usually smooth. There’s a good level of trust and autonomy, which I really appreciated. The remote work flexibility is also a major plus for work-life balance in the SaaS sector.
Cons: Some internal processes feel a bit ad-hoc, which can sometimes lead to minor inefficiencies or confusion. While there's room for growth, clearer career progression frameworks would be beneficial for ambitious employees. Occasionally, communication between departments could be more synchronized to ensure everyone is aligned on project goals and timelines.
Advice to Management: Consider investing more in structured career development paths and formalizing some project management processes to enhance overall team efficiency and employee long-term planning.
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Software Engineer
3.7
27 August 2026
Good flexibility and collaborative team environment
Pros: The biggest win is definitely the work flexibility. As a remote software engineer, I appreciate the trust and autonomy Onoff provides. The team I work with is really supportive, and there's a genuine sense of collaboration. We're building a useful product in the virtual phone number space, and seeing it evolve is rewarding. Learning opportunities are present, especially for those willing to take initiative.
Cons: While flexibility is great, structured career growth paths could be more defined. Sometimes, project priorities can shift quickly, leading to temporary spikes in workload. Process improvements, like streamlining approval workflows, would also help boost overall efficiency. Communication, especially across different time zones or departments, can sometimes be a challenge.
Advice to Management: Focus on establishing clearer career progression frameworks for technical roles and invest in tools or processes that improve cross-functional communication and project management efficiency, especially for a growing remote team. This will help retain talent and ensure smoother operations.
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Software Engineer
3.6
24 September 2026
Decent tech role with collaborative team, but growth paths unclear.
Pros: The team at Onoff was genuinely great – very collaborative and supportive. I learned a lot about building scalable solutions in the SaaS industry. The flexible hybrid work model was a big plus, allowing for a good balance between personal life and work. It's a dynamic environment for anyone interested in mobile technology.
Cons: Career progression wasn't always clearly defined, making it a bit difficult to gauge advancement opportunities. Sometimes project priorities shifted quickly, which could feel a little chaotic. More structured professional development programs would have been beneficial.
Advice to Management: Consider creating more transparent career ladders and structured development plans for engineers to enhance retention and provide clearer growth pathways.
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Common Questions About Onoff

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