---
title: 'AI Engineer | Voice at JUPUS'
canonical: 'https://feeny.ai/job/ai-engineer-voice-jupus-germany-grkc13gnbkm7'
type: 'job'
last_seen: '2026-09-13'
---

# AI Engineer | Voice at JUPUS

- **Company:** JUPUS
- **Location:** Germany
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2026-09-09
- **Last confirmed live:** 2026-09-13
- **Apply:** https://jobs.ashbyhq.com/jupus/e1036acc-a0fe-4b2f-a95f-744c51175e1d/application

**Skills:** Python, ASR, STT, TTS, LLM orchestration, Prompt engineering, RAG, Tool/function calling, PSTN, SIP, WebRTC, LiveKit Agents, Vapi, Pipecat, Retell, Daily Bots, Bland, OpenAI Realtime, Twilio, Telnyx

> Jupus is seeking a Senior AI Voice Engineer to architect and maintain production-ready voice AI systems and phone agents. The role involves owning the complete voice stack, from telephony infrastructure to LLM orchestration, while collaborating with product and engineering teams to ship reliable AI functionality.

## Job description

We’re seeking a driven Senior AI Voice Engineer to join one of the fastest-growing legal tech companies in Europe as we expand our core AI team delivering ‘Marie’, our AI phone assistant. This role focuses on production voice AI systems operating over real telephony infrastructure: building, maintaining, and scaling phone agents that handle real customer conversations at production volume. You'll own the complete voice stack, from telephony and speech systems through to LLM orchestration, tooling, evaluation, and observability. Reporting to the AI Lead, you’ll work hands-on from architecture to implementation, collaborating with the Head of Engineering and product teams to ship reliable AI functionality while improving our voice infrastructure, evaluation workflows, and AI platform capabilities. For an engineer who has personally shipped production phone agents and end-to-end LLM-powered products, this is an opportunity to take technical ownership of Marie, ship quickly, and shape how voice AI evolves across the company.

## Your Challenge and Opportunity in This Role

You’ll help define how voice AI is built and operated in a fast-moving product environment. As a core Senior AI Voice Engineer, you’ll turn modern voice and generative AI technologies into production-ready systems that deliver real value to users. Your primary goal will be to maintain, improve, and expand our phonebot platform. Expect strong technical ownership, fast iteration, and a clear focus on building reliable voice systems that operate effectively in real-world telephony environments.

Tasks: AI Strategy & Implementation:

- Architect and implement production-ready generative voice AI solutions within our product suite
- Develop voice-based AI systems, integrating speech technologies such as ASR/STT and TTS into conversational workflows
- Design and optimize real-time voice agent workflows, balancing latency, reliability, and conversational quality
- Architect and implement production-ready generative AI and LLM-based solutions to power voice experiences end-to-end
- Implement evaluation, testing, and observability for AI systems to ensure reliability and continuous improvement
- Establish best practices for AI development, testing, and deployment across products
- Handle AI development hands-on as a core technical contributor within a small, fast-moving team where engineers own problems end-to-end and ship quickly

Cross-functional Collaboration:

- Work closely with product, design, and engineering teams to integrate AI capabilities into real product workflows
- Partner with stakeholders to define and improve user experiences across voice, telephony, and AI-driven interactions
- Translate complex AI concepts into practical product features and communicate them clearly to both technical and non-technical stakeholders

Requirements: Technical Expertise:

- 3+ years of software engineering experience
- 1–2+ years of hands-on experience building and operating production Voice AI systems
- Proven experience building and shipping production phone agents handling real users and real phone calls
- Hands-on experience with at least one major voice-agent framework or provider such as LiveKit Agents, Vapi, Pipecat, Retell, Daily Bots, Bland, OpenAI Realtime, Twilio, Telnyx, Deepgram, Soniox, ElevenLabs, or Cartesia
- Strong understanding of the complete voice pipeline, including STT, LLM orchestration, TTS, turn-taking, interruption handling, and latency optimization
- Strong understanding of telephony concepts including PSTN, SIP, and WebRTC
- Experience building LLM-powered products end-to-end, including prompt engineering, RAG, tool/function calling, model selection, and evaluation
- Experience with LLM observability and evaluation tools and designing evaluation pipelines for AI systems
- Strong programming skills in Python and solid software engineering practices
- Experience implementing AI systems in real production environments, not purely research or academic settings

Nice to Have:

- Experience operating high-volume outbound calling systems, including concurrency management, retries, and compliance considerations
- Experience deploying OpenAI Realtime API or Gemini Live into production environments
- Experience with voice evaluation and observability platforms or custom evaluation frameworks
- Fluency or working proficiency in European languages such as German, French, Spanish, or Italian
- Experience contributing to or participating in voice AI communities and open-source projects

Note:

- You must be located in the CET -2/+2 timezone for this role, and we do not support relocation or visa sponsorship.

## Benefits

🚀 Foundational Impact – Help build and scale the core AI capabilities of JUPUS from the ground up 🔒 Technical Ownership – Work directly on the systems powering AI features across multiple products 🌱 Growth Environment – Build production AI systems at the cutting edge of generative AI and agentic workflows 💼 Leadership Visibility – Flat hierarchy with direct access to the Head of Engineering and CTO, reporting to the AI Lead 🏡 Fully Remote – Enjoy the flexibility of working from anywhere 💻 Top Equipment – State-of-the-art MacBook plus all the accessories you need 🏋️ Wellbeing Perks – Urban Sports Club membership to support your healthy lifestyle

If you're passionate about building production voice agents, solving real-world telephony challenges, and creating intelligent AI systems that users rely on every day, we’d love to hear from you.

## About JUPUS

## Company Overview
- **One-liner**: JUPUS provides an AI-powered legal secretary platform that automates client intake, document generation, and communication for law firms.
- **Entity Type**: Private (Series A – €13M raised)
- **Headquarters**: Cologne, Germany
- **Founded**: 2022
- **Founders**: René Fergen and Jannis Gebauer

## Core Business
- **Primary industry**: Legal technology (AI software for law firms)
- **Target customers**: B2B – solo practitioners, small to mid-size law firms, and larger practices in German-speaking Europe
- **Mission or purpose statement**: Automate the client intake process from initial contact to complete file, reducing administrative load and enabling lawyers to focus on billable work.

## Products & Services
- **JUPUS AI Chatbot**: An intelligent chatbot for law firm websites that captures visitor inquiries, asks for relevant information and documents, and converts 3x more visitors into formal requests.
- **JUPUS Phone AI**: An AI answering machine that understands caller concerns, asks for key details, and never misses an important call.
- **Online Appointment Booking**: A calendar widget synced with the firm’s calendar; clients reserve appointments and provide preliminary legal information before booking.
- **Digital Questionnaires & Document Generation**: Automatically generates powers of attorney, fee agreements, and other legal documents from client-submitted information; supports digital signatures.
- **Automated File Creation**: One-click creation of case files in the firm’s software, including all collected master data, documents, and communication history.
- **Central Request Platform**: All inquiries (email, phone, website) are aggregated in a single dashboard with AI-powered summarisation and suggested replies.

## Market Standing
- **Valuation/Market Cap**: Not disclosed (private company)
- **Key Metric**: Total funding – €13M Series A (lead investor undisclosed in snippet; previous seed of €6.5M led by Acton Capital) [htgf.de](https://www.htgf.de/en/portfolio/htgffamily/jupus/) | Total funding approx. €20M (combining angel, pre-seed, seed, and Series A)
- **Notable Investors**: Acton Capital (lead seed), HTGF (High-Tech Gründerfonds, lead pre-seed), plus multiple angel investors including Marcus Bez, Ingo Weber, Laura Wolfram [linkedin.com](https://de.linkedin.com/company/jupuslegal)
- **Growth Signals**: Headcount grew 176% YoY to 59 employees; 20 active job postings (monthly job postings +17.6%); hundreds of law firms processing 200+ inquiries per day (as of May 2023) [htgf.de](https://www.htgf.de/en/portfolio/htgffamily/jupus/) | LinkedIn followers grew 129% YoY to 4,397

## Competitive Advantages
- **AI-first automation** that covers the entire client intake workflow – from chatbot to digital signature – not just a single piece of software.
- **Full compliance** with GDPR, BRAO (German legal professional rules), and use of certified EU servers.
- **30-minute setup** and immediate integration with 30+ law firm software systems (e.g., AnNoText, RA-Micro, DATEV).
- **No training required** – platform is pre-configured with the firm’s own documents during onboarding.

## Strategic Focus
- **Scaling sales and customer success** to capture the growing German legal-tech market (20 open positions in sales, onboarding, and customer success).
- **Deepening AI capabilities** with the new Phone AI module and expanding conversational AI to handle more complex legal queries.
- **Internationalisation** – small presence already established in the UK, Nigeria, and Spain; likely expansion beyond DACH region.

## Why Work Here
- **Fast-growing startup** with 176% headcount growth and a clear product-market fit in a traditional industry ripe for disruption.
- **Hybrid/office culture** – headquartered in Cologne (WeWork at Pilgrimstraße 6c) with a young, multidisciplinary team (engineering, product, sales, marketing).
- **Strong technical team** – 11 engineers (16% of workforce) led by a Head of Engineering, with a Lead Product Designer and a Head of Product.
- **Impactful work** – every employee directly contributes to reducing lawyers’ administrative burden and improving client experience.
- **Transparent culture** – open job postings show heavy investment in go-to-market roles, indicating aggressive growth and career advancement opportunities.

## Sources
1. [jupus.de](https://www.jupus.de/en) – Official product and pricing page
2. [linkedin.com](https://de.linkedin.com/company/jupuslegal) – Company overview, employee data, funding details, open positions
3. [cbinsights.com](https://www.cbinsights.com/company/jupus) – Headquarters, financials, total funding
4. [htgf.de](https://www.htgf.de/en/portfolio/htgffamily/jupus/) – Funding history, team size, daily inquiry volume, founder names
5. [jobs.ashbyhq.com](https://jobs.ashbyhq.com/jupus) – Careers page (20 active openings)

## Other roles at JUPUS

- [Account Executive (m/w/d) – AI Legal Tech | Köln](https://feeny.ai/job/account-executive-m-w-d-ai-legal-tech-koln-jupus-cologne-wg2c3gwwyb6r) — Cologne, Germany
- [Account Executive (m/w/d) – AI Legal Tech | Berlin](https://feeny.ai/job/account-executive-m-w-d-ai-legal-tech-berlin-jupus-berlin-3e4t3z2qf0d3) — Berlin, Germany
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