Software Architect

Sinch is a global leader in the growing market for Communication Platforms as a Service (CPaaS) and mobile customer engagement. We are specialists in allowing businesses to reach everyone on the planet, in seconds or less, through mobile messaging, email, voice, and video.

We reach every phone on earth. From the lifechanging to the timesaving, we're helping our customers to interact with people like never before. For you, that means working in an environment that offers an incredible variety of exciting challenges, and the chance to impact how billions of people engage with their favourite brands. The dream of personalizing content to all 15 billion phones on the planet is no fairy tale

More than 150,000 businesses, including many of the world's largest companies and mobile operators, use Sinch's advanced technology platform to engage with their customers. Moreover, Sinch has been profitable and fast-growing since its foundation. Sinch's core values are Make it Happen, Dream Big, keep it Simple and Win Together. These values describe how our global organization works and inspire every of our more than 5,000 employees across 60 different countries.

The essence of the role 

We are seeking a highly skilled Voice Architect with deep expertise in Asterisk-based telephony systems to design, implement, and optimize VoIP infrastructure. The ideal candidate will be responsible for architecture, configuration, integration, and performance tuning of enterprise-grade Asterisk deployments, ensuring high availability, scalability, and security.

Who are you?

• Architect, design, and deploy Asterisk-based VoIP solutions for enterprise and service provider environments.
• Develop, maintain, and optimize dialplans, SIP configurations, and call routing logic.
• Integrate Asterisk with databases, APIs, CRMs, call center platforms, and other telephony systems.
• Perform capacity planning, scalability assessments, and high-availability architecture design.
• Implement SIP trunking, VoIP gateways, and interconnects with carriers.
• Monitor and troubleshoot call quality, latency, jitter, and packet loss issues.
• Create and maintain technical documentation, SOPs, and system diagrams.
• Collaborate with network, security, and application teams to ensure seamless integration and compliance.
• Evaluate and implement security best practices for VoIP, including TLS/SRTP, authentication, and fraud prevention.
• Stay current with Asterisk updates, new modules, and VoIP technology trends.
• Architect and deploy a scalable SIP-based dialer infrastructure supporting more then 5,000+ concurrent calls.
• Have successfully integrate AI-based voice bots for automated outbound call flows.
• Have design and implement a custom monitoring stack with Prometheus, Grafana, and Homer for real-time SIP traffic visibility.
• Need to mentor junior engineers and helped upskill them in Asterisk, Kamailio, and SIP protocol handling.
• Play a key role in telecom vendor evaluation and onboarding, reducing operational costs

Required Skills & Qualifications

• Bachelor's degree in computer science, MCA, Telecommunications, or related field (or equivalent experience).
• 10+ years of experience designing and managing Asterisk-based telephony systems.
• Strong understanding of SIP, RTP, IAX2, and VoIP protocols.
• Hands-on experience with Asterisk configuration, dialplan scripting, and AGI/ARI development.
• Knowledge of Linux (CentOS, Debian, Ubuntu) administration.
• Experience with network protocols (TCP/IP, DNS, DHCP, NAT) and QoS tuning for VoIP.
• Familiarity with call recording, IVR systems, voicemail, and conferencing.
• Proficiency with monitoring and troubleshooting tools (Wireshark, sngrep, tcpdump).
• Strong problem-solving, analytical, and documentation skills.

Preferred Skills

• Experience with FreePBX, Issabel, FreeSWITCH or other Asterisk-based distributions.
• Knowledge of SBCs (Session Border Controllers) and VoIP security frameworks.
• Scripting/programming skills (Linux,Python, Perl, Bash, PHP).
• Familiarity with containerization (Docker/Kubernetes) for Asterisk deployment.
• Exposure to cloud-based telephony platforms and APIs (Twilio, AWS Chime, etc.).

Being you at Sinch :

• We're a worldwide group of people, committed to diversity. We're working to offer an increasingly inclusive workplace wherever you are. No matter who you are, you'll be able to explore new career and growth options - sharing your voice, building your path and making it happen with us.

• We're proud to be an equal opportunity employer, and all qualified applicants will be considered to join our team regardless of race, colour, religion, gender identity or expression, sexual orientation, pregnancy, disability, age, veteran status, and more.

Your life at Sinch:

• Being a Sincher is all about learning and being in pursuit of new challenges. Working in the offices, at home, or in a hybrid model, that means celebrating change and the unknown, rolling up your sleeves and seeing what impact you can have on the world. The only way is up, and you'll be reaching for the opportunities that match where you want to take your career. It's closer than you think.

• It's time to chase the answers, chase the challenges and chase the dream.

Are you ready? Join us on our journey