We’re not hiring “just another developer.”
We’re bringing in sharp Mid and Mid-Senior Java Engineers to help launch something big, and strengthen the backbone of products already used globally.
At Onoff, growth isn’t a buzzword, it’s been our reality over the past few years. Revenue up. Teams expanding. Ambition even higher. Now we’re scaling our Tallinn crew and looking for people who want to build, influence, and leave a mark.
🚀 Why Onoff?This is not a ticket-taking, feature-factory role. This is where engineering meets ownership.
💡 Lead & Influence – Shape architecture, challenge ideas, and drive decisions that matter.
📈 Real Impact – Work on core systems powering next-gen telecom SaaS.
🌎 Flexibility – Work in a way that actually works for you.
💰 Competitive Compensation – We invest in people who raise the bar.
🏖 Extra Time Off – Because performance needs recovery too.
🩺 Private Health Plan – We’ve got your back.
✈️ Travel Budget – Inspiration shouldn’t be limited to your desk.
📚 Continuous Learning – Stay evolving.
🎉 Culture That Feels Real – Smart people, good vibes and yes, we celebrate wins properly.
• Building and scaling high-availability backend systems for a global communication platform
• Designing APIs and infrastructure that are fast, secure, and built to last
• Mentoring others while staying hands-on (no ivory tower leadership here)
• Collaborating across product, design, and engineering to ship meaningful solutions
• Owning things end-to-end: from idea → production → impact
• Strong Java expertise — Clean, efficient, production-grade code is your standard
• Experience with Docker, MySQL, AWS — You know how systems behave at scale
• A leadership mindset — You elevate others and aren’t afraid to challenge the status quo
• Sharp problem-solving — Complexity doesn’t scare you
• Product thinking — You care about why, not just how
• Startup energy — You move fast, adapt faster
👉 If you’re ready to build something new while strengthening something already powerful, we should talk.
Send your CV 📩 and let’s create what’s next, together.
Skills Required
- Strong Java expertise and ability to write clean, production-grade code
- Experience with Docker
- Experience with MySQL
- Experience with AWS
- Experience building and scaling high-availability backend systems
- Mentoring others while staying hands-on
- Leadership mindset and ability to influence architecture and decisions
- Sharp problem-solving skills
- Product thinking and startup adaptability
What We Do
Onoff is a French telecommunications company that provides cloud-based mobile telephony through smartphone and web applications. Its services let individuals and businesses use multiple mobile numbers without additional SIM cards or phones, while Onoff Business enables employers to assign and manage numbers, calls, SMS, contacts, voicemail, reporting, and integrations for teams. The company combines mobile-app and cloud technologies to make communications more flexible, economical, and environmentally friendly.
