Experienced Backend Developer

At ai-coustics, we’re building the quality layer for Voice AI. Our AI-powered speech technology turns any audio - live or recorded - into studio-quality output. Since our launch, we’ve built a community of over 800,000 users, have processed more than 2 million audio files. We’re at a pivotal moment of growth and product innovation - and we’re looking for ambitious builders to join us on this journey. If you’re excited about defining a new category in Voice AI and shaping the future of audio, we’d love to meet you. Who we are We’re an in-person team of audio and technology enthusiasts based out of Berlin. We love being in the office, hanging out together and learning from each other everyday. We ship fast. All of our work is novel and cutting edge, and execution speed is paramount. Our culture thrives on ownership and open collaboration - where the best ideas win, no matter where they come from. We support each other. We have an open and inclusive culture that’s focused on giving everyone the resources they need to succeed. The ideal start date for this position is Jan 1, 2026. Tasks Design & Implement APIs: Architect, build, and maintain RESTful and event-driven microservices using FastAPI. Database Management: Optimize and maintain PostgreSQL schemas, queries, and migrations for high throughput and reliability. Cloud Infrastructure: Deploy, monitor, and scale services on AWS (EKS, RDS, S3) following best practices. Containerization & Orchestration: Build and orchestrate Docker containers with Kubernetes (EKS) to ensure seamless deployments. CI/CD Pipelines: Implement and maintain continuous integration and delivery workflows using GitHub Actions. Testing & Quality: Write unit, integration, stress and end-to-end tests to uphold code quality and reliability.Architectural Design: Collaborate on software architecture decisions, especially around microservices, event streaming, and system observability. Requirements Startup Experience: 6+ years in a high-velocity startup or product-centric environment, shipping features end-to-end. Languages & Frameworks: Expert in Python and FastAPI, with a strong grasp of modern API design. Databases: Proficient with PostgreSQL (indexes, migrations, tuning) and familiarity with at least one NoSQL store. Cloud Platforms: Hands-on AWS experience (compute, storage, serverless). DevOps Tools: Docker, Kubernetes, and CI/CD toolchains. Testing Mindset: Deep understanding of the testing pyramid and test frameworks (pytest, unittest). Software Architecture: Proven track record designing scalable, fault-tolerant microservices. Nice-to-Have Qualifications Infrastructure as Code: Terraform, Helm. GitHub Actions and shell scripting for automation. Audio processing pipelines or DSP familiarity. Observability stacks: Prometheus, Grafana, ELK/EFK. Benefits Competitive Compensation: Enjoy a competitive salary package and additional benefits. Stock Options: Early-stage employees receive stock options, enabling you to share in the company’s success. Learning Opportunities: Collaborate with a team of accomplished audio and ML experts, with ample room for professional growth. Startup Culture: Immerse yourself in a dynamic, fast-paced environment with passionate and collaborative colleagues. Professional Growth: Seize the chance to shape your career path as the company expands. High Impact: Join a groundbreaking startup at a pivotal growth stage, making a real difference in how people experience audio. Contribute to the Future: Help define the landscape of generative audio and speech enhancement technology. If you are ready to lead the charge in revolutionizing the audio experience and drive our startup to new heights, we would love to hear from you. Apply today to join the ai-coustics teamai-coustics is a Berlin-based startup pioneering Generative Audio AI technology. We're on a mission to redefine the way people experience speech quality and intelligibility in real-time communication and media content by providing solutions to our millions of people across various verticals.