About the Role
Are you looking for a role where your talents are truly valued and your professional growth is a priority? We are looking for a Voice Developer with deep expertise in real-time communication systems and a passion for bridging the gap between high-quality code and robust infrastructure. But you won't just be filling a seat; you’ll be joining an excellent team of talented colleagues.
We are looking for someone with a passion for bridging the gap between high-quality code and robust infrastructure. This role is ideal for a developer who thrives on the unique challenges of VoIP, solving complex routing logic, managing media servers, and ensuring the reliability of global voice traffic.
You will be the driving force behind developing our core SIP applications and the associated developer experience tools. While your primary focus is software development, you are someone who "speaks" infrastructure, ensuring our real-time communication stacks are scalable, automated, and resilient. You’ll collaborate across cross-functional teams to deliver seamless, high-performance voice solutions within our modern cloud environment.
Key Responsibilities and Qualifications
SIP & Media Development: Design, develop, and maintain SIP-based applications using Kamailio, alongside media servers like Asterisk.
Application Ownership: Take full-cycle ownership of telephony-related applications and integrations (developed in mainly Python and PHP)
CI/CD & Automation: Build and maintain robust deployment pipelines.
Developer Experience: Improve the local development environment and build automated testing frameworks to streamline how we ship voice features.
Linux Systems: Manage day-to-day operations, troubleshooting, and application deployments within a Linux environment.
Collaboration: Work closely with other engineering teams to ensure our voice infrastructure delivers maximum value to our customers.
Innovation: Interest in Generative AI and LLMs.
Nice to have
Cloud Infrastructure: Experience managing voice-specific architectures within AWS.
Systems Architecture: Deep understanding of redundancy, security, and performance optimization for real-time media.
Monitoring & Observability: Expertise in telephony-specific monitoring (e.g., automated call testing and Kamailio-specific alerting) and general dashboarding.
Infrastructure as Code: Familiarity with tools like Terraform for managing cloud-native services.
Familiarity with Generative AI technologies and Large Language Models
Design, optimize, and manage relational databases like MySQL
Our Ways of Working
Each team has clear responsibilities and goals and the freedom to collaborate on the optimal design for the products and solutions we build. We want to hear your opinion!
We have an agile approach to processes and teamwork and we constantly evaluate and adapt. Our Product and UX teams are closely integrated with development. We use modern frameworks and the best tools available.
We work flexibly and have fun at work. Delivering customer value is as important as the wellbeing of our friends and colleagues. We value personal growth and encourage learning, and embrace every opportunity to share knowledge in the team.
Where you’ll be and how you’ll work
We have three offices: London, Uppsala, and Paris. This role is based in the Uppsala office. We work business hours, but we understand that life sometimes gets in the way.
Kaisa Culture
What makes Kaisa stand out? Our values, guiding us every day:
Innovate with Agility - We move fast, think creatively, and adapt seamlessly.
Win Together - Success is a team effort, and we celebrate it as one.
Own It - Accountability drives progress, and we take pride in our work.
Champion Sustainability and Diversity - We foster inclusivity and make responsible choices.
Spread the Vibe - A positive atmosphere fuels great ideas and connections.