Senior Full‑Stack Engineer (Audio & Sound Systems Lead)

Driven by the passion to improve quality of people’s lives, WSA continues to grow as a market leader in the hearing aid industry. With our commitment to increase penetration in an underserved hearing care market, we want to accelerate our business transformation in order to reach more people, more effectively.

As part of the engineering team at Koalys Technologies, you will take ownership of the audio layer sitting at the core of our cloud-based audiometry products and help shape the future of SaaS medical audio technology.

What you will do

• Lead the redesign and rewrite of the company’s browser-based audio engine
• Design scalable and maintainable audio architecture using Web Audio APIs and cloud technologies
• Develop end-to-end full-stack features across backend and frontend, including browser side audio pipeline.
• Own and maintain sound-related testing and validation tools for meeting medical-grade audio standards
• Ensure reliable audio routing, output consistency, and predictable audio output for our digital audiometer
• Diagnose and resolve complex audio issues across browsers, operating systems, and application layers
• Define and standardize best engineering practices for audio processing, handling, and validation
• Collaborate with cross-functional teams including Product, QA, and Engineering to deliver high-quality solutions.
  
  

• Bring 7+ years of experience as a Full-Stack Engineer working on end-to-end product development
• Demonstrate strong experience developing SaaS applications and cloud-based platforms
• Apply solid knowledge of JavaScript and modern web application architectures
• Build and integrate backend APIs and application logic in full-stack environments
• Work hands-on with browser audio technologies, including Web Audio API in browser-based environments
• Ability to test and validate audio systems or signal handling, involving hardware-related software
• Strong understanding of audio concepts including routing, frequency response, output levels, filtering, and signal handling.
• Experience with audio testing equipment, sound analysers, or audio signal processing technologies is a strong advantage.
  
  

• Collaborative team player who actively contributes to a positive team environment
• Has a knowledge sharing mindset, promoting learning and best practices across the team contributing to a strong engineering culture
• Take ownership of complex technical domains and drive initiatives independently
• Communicate clearly with both technical and non-technical stakeholders
• Solve problems analytically with strong attention to quality and reliability
• Adapt quickly in evolving technical environments and legacy-modern hybrid stacks
• Maintain a detail-oriented mindset suited for medical-grade product development
• Balance innovation with stability, scalability, and compliance requirements.