Senior Software Engineer

• Designing, developing, and maintaining backend software components and RTC services.
• Operating and working with Open Source RTC products such as Kamailio, FreeSWITCH, and OpenSIPS.
• Contributing to the definition of system architectures, integrations, and scalability decisions.
• Performing functional, load, and interoperability testing in demanding production environments.
• Automating processes and ensuring technical quality through CI/CD pipelines, testing, and documentation.
• Providing technical expertise in specialized RTC consulting, advising on infrastructure, reliability, and performance.
• Collaborating closely with international technical and product teams, using English on a daily basis.

Do you have experience in Software development?, We're looking for someone with a strong technical vision and a true ownership mindset, who understands the value of reliability, efficiency, and quality in software development.

We're seeking an engineer with a technical consulting mindset, who enjoys analyzing, improving, and building complex communication systems, and who is motivated by developing real products in close collaboration with customers., * At least 5 years of experience as a backend developer, working with languages such as Java, C#, Go, or C++.

• Strong knowledge of Linux, Docker, and distributed systems.
• Familiarity with - or a genuine interest in - RTC communication protocols such as SIP, RTP, and WebRTC.
• Experience with automated testing and CI/CD pipelines.
• Good level of technical English and ability to communicate fluently in international environments.
• An analytical, responsible mindset with a strong focus on continuous improvement.

Nice to have

• Experience working in telecommunications or VoIP environments, using technologies such as Kamailio, FreeSWITCH, or OpenSIPS.
• Interest in technical consulting and enjoyment of learning and working with complex technologies.

On-site Tuesday, Wednesday, and Thursday. Remote on Monday and Friday.

• Flexible working hours, allowing a start time between 7:30 AM and 9:30 AM.
• Reduced working hours during the summer months.
• Semi-annual performance and professional development reviews.
• 24 days of vacation, including your birthday.
• A collaborative, close-knit, and highly skilled technical tea.
• Talent referral bonus program.

At Zaleos, we build software for real-time communication (RTC) systems. We design, develop, test, and maintain software for companies that rely on protocols such as SIP, RTP, and WebRTC. Our mission is clear: to help organizations ensure secure, stable, and always-available communications. We work in mission-critical environments where reliability is not optional: * Voice AI: we enhance the telephony layer for conversational agents and intelligent voice platforms. * Enterprise Communications: we develop software for VoIP, CPaaS, and cloud PBX platforms. * Emergency Systems: extensive experience designing and building Core Services for emergency call networks in the U.S. Since 2015, we have been helping companies across different industries keep their RTC communications running at all times, with a culture focused on engineering excellence, quality, and technical responsibility., Because here, engineering has a purpose. Every project impacts our clients' real-time communications and helps keep critical communication systems running worldwide. If you're passionate about technology, motivated by technical challenges, and value quality over quantity, this is the place for you.