Senior Fullstack Engineer: AI, Backend, Infrastructure

TODAY revolutionizes Financial Advice by making advisors AI-native. Its AI sales operating system supports financial and insurance advisors before, during, and after client meetings, so they save time and give their clients better advice.

If terms such as Voice AI, workflow automation, real-time analysis, and assistance are what you're passionate about, we want to hear from you.

Tasks

• Architect, build, and own core product features across our entire stack, from AI (Voice AI, STT, TTS, Microsoft Foundry, MCP, Deep Agents, LangChain, Langfuse) to Python (optionally Golang and/or TypeScript ), Postgres , and Microsoft Azure infrastructure.

• Design and implement scalable microservice architectures on a modern infrastructure stack.

• Develop production-grade AI products , including features driven by LLMs, agents, and advanced audio ML .

• Integrate a wide variety of third-party APIs, MCPs, and data stores to expand our platform's capabilities.

• Get hands-on with Voice AI , building systems for audio analysis and processing, VAD, noise cancelation, turn management, and implementing robust evaluation frameworks for evals and agent orchestration .

• Champion a security-first mindset, ensuring the highest standards for data, application, and infrastructure security .

• Establish and drive a comprehensive testing culture, from unit testing to contract and penetration testing.

Requirements

• You have a proven track record of building and shipping production-grade AI products , especially in a startup environment.

• You possess rock-solid, hands-on experience in Python (and/or Golang ), Postgres (or MySQL), microservices, and modern infrastructure. ReactJS, TypeScript, or Electron is also a big plus.

• You have experience with API/MCP integrations and can quickly get up to speed on new services.

• You have deep, practical experience with building AI Agents, integrating and evaluating LLMs , prompt engineering, and evals.

• You have built scalable, responsive infrastructure under high-traffic and big-data regulatory requirements.

• Experience building prod-grade agents for the memory, context, and tooling challenges.

• You are exceptionally driven with a strong entrepreneurial mindset and are excited by the prospect of joining the team at an early stage.

• You are a pragmatic problem-solver who can translate complex requirements into robust, scalable, and secure technical solutions.

• Previous experience in FinTech, InsurTech, or other regulated industries is a plus.

Benefits

Join our mission to deliver peace of mind at scale. Work with and learn from our Founder team that created over €1.5B in Fintech enterprise value and is driven to aim higher this time. Join an extremely fast-moving AI startup that’s transforming how thousands of customers experience financial advice.

In addition to a competitive salary, we offer significant equity.

Include in your application a link, demo, or Loom of a production-grade AI, FinTech, High Traffic- or Big Data-oriented product or solution you’ve shipped.

Explain the architecture, tech choices, and trade-offs you faced, particularly around AI/ML, scalability, reliability or security.

Ready to Shape the Future?

Join us and deliver peace of mind at scale. We’re excited to be working with you.

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Source: Arbeitnow (https://www.arbeitnow.com/jobs/companies/usetoday-aps/senior-fullstack-engineer-ai-backend-infrastructure-berlin-456522)