Senior Software Engineer (Voice AI)

TL;DR

Senior Software Engineer (Voice AI): Building and optimizing real-time voice translation systems with an accent on eliminating latency and ensuring seamless audio streams for human-like interaction. Focus on developing proprietary models, streaming architecture, and user interfaces for complex AI interaction challenges in a 0-to-1 engineering environment.

Location: Hybrid in London, Munich, Cologne, Amsterdam, or Berlin. Requires office attendance twice a week.

Company

DeepL is a global AI product and research company building secure, intelligent solutions, including a Language AI platform and autonomous AI assistants, serving over 200,000 business customers and millions of individuals worldwide.

What you will do

• Thrive in a "0-to-1" engineering environment, prototyping and refactoring features for scale.
• Develop polished UIs in React and deep-dive into C#/.NET Core, WebRTC, and streaming architectures.
• Optimize for human experience and conversation flow, ensuring real-time performance of audio.
• Act as a technical leader, identifying and resolving bottlenecks across the full stack.
• Build proprietary models, streaming architecture, and user interfaces for a "Universal Translator".
• Work in a dynamic, cross-functional squad alongside Researchers, Product Managers, and Designers.

Requirements

• Hybrid work: Must be able to work from London, Munich, Cologne, Amsterdam, or Berlin with twice-weekly office attendance.
• English: B2 required.
• Possess a "0-to-1" builder mindset, comfortable with ambiguity and problem-solving.
• Demonstrate Full-Stack Fluency with a backend tilt, including React, C#/.NET Core, WebRTC, and Streaming Architectures.
• Product obsession, caring deeply about customer journey and conversation flow.
• High agency in identifying bottlenecks and proactively fixing them across the stack.
• Interest in B2B SaaS challenges like Identity (SAML/SSO), Monetization, and Compliance.

Culture & Benefits

• Hybrid work schedule with flexible hours and trust in individual productivity.
• Diverse and internationally distributed team with over 90 nationalities.
• Open communication, regular feedback, and a culture valuing empathy and growth.
• Virtual Shares for all employees, linking contributions directly to DeepL’s growth.
• Regular in-person team and company-wide events.
• Monthly full-day hacking sessions for personal projects and cross-team collaboration.
• 30 days of annual leave (excluding public holidays) and access to mental health resources.
• Competitive benefits package tailored to your unique location.