Senior AI Engineer in London

AudioStack is revolutionising the way brands and businesses create audio content at scale. Our AI-powered platform enables the seamless generation and customisation of high-quality audio (complete with voiceovers, SFX and music beds). We work with leading global brands, agencies, and developers, helping them unlock the full potential of audio automation.

AudioStack is building the next generation of intelligent and automated audio creation – a system that uses AI agents to orchestrate audio production at scale. We’re looking for a Senior Agentic AI Engineer to own the architecture and delivery of our agentic capabilities, from designing multi-step agent workflows to shipping production-grade orchestration pipelines.

You’ll join a small, high-impact backend team in London and work closely with product and engineering leadership to define how intelligence is embedded into our platform. This is a hands‑on, high‑ownership role: you’ll scope problems with the product manager, design solutions, build them, and see them through to production – all in a fast-moving environment where priorities shift and ambiguity is the norm.

What You’ll Be Doing

• Own the end-to-end delivery of agentic systems – from scoping with Product to shipping to production.
• Design and implement multi‑agent orchestration systems, including agent loops, tool‑use patterns, and context management strategies.
• Make key architectural decisions around LLM integration: prompt design, caching strategies, cost management, and evaluation approaches.
• Build real‑time communication layers (Server‑Sent Events, WebSockets, HTTP/2 streaming) to power agent‑to‑frontend and agent‑to‑agent interactions.
• Contribute to the wider code base roadmap.
• Raise the bar of backend engineering quality across the team through code review, knowledge sharing, and adoption of best practices.
• Collaborate with engineering and product leadership on technical direction, balancing short‑term delivery with long‑term platform health.
• Own the quality of the systems you build – including testing, monitoring, incident response, and iterating based on customer and stakeholder feedback.

Requirements

• Strong production experience with Python and a track record of shipping backend systems to production end‑to‑end.
• Practical, hands‑on experience building agentic AI systems.
• Demonstrated ability to operate in a resource‑constrained, fast‑moving environment with ambiguous objectives and shifting priorities.
• Solid systems and solutions design skills, with the ability to scope problems, propose candidate architectures, and communicate trade‑offs clearly.
• Experience with real‑time communication protocols.
• Practical experience with cloud infrastructure, CI/CD pipelines – enough to bring a solution to production without depending on a dedicated infra team.
• A track record of raising engineering quality in a team – through code review, mentoring, or introducing better practices.

Desirables

• Hands‑on experience going beyond out-of-the-box LLMs and prompt engineering such as RAG pipelines or fine‑tuning LLMs.
• Familiarity with agentic coding tools (e.g. Claude Code) and an understanding of patterns like context saturation management and agentic development loops.
• Background in audio, speech, or media technology.

Benefits

• Stock Options (subject to performance and time served).
• The opportunity to work in a leading voice & audio AI company, with an exceptional tech team with diverse and highly recognised backgrounds.
• Be part of a great story: we are making audio scalable for the first time in history.
• Hybrid working and Flexible working hours with 2 days in the office per week.
• The opportunity to shape a startup culture in a company in the fast‑growing audio/video space.
• A truly international and diverse team.
• Offices in the hottest startup hubs London, Barcelona, New York and San Francisco.
• Dog friendly offices (come and meet Swanson and Bernie)!

Why Is Now a Really Exciting Time to Join AudioStack

AudioStack is the leading Audio-As-A-Service company with a very strong technology stack and AI R&D team, featured in some of the leading media. We have a great team and culture and you will be immersed in a very international environment and market. We are still a small team of 40 people expanding rapidly internationally. As an early employee you have a lot of room to apply and grow your skills fast, build out a team and move quickly with your ideas, enjoying a lot of space, flexibility and trust. Join us now to revolutionise how audio production is delivered at scale!

Our Commitment to Diversity

We embrace diversity at AudioStack. To build a product that’s loved by everyone, we need a team with all kinds of different perspectives, experiences, and backgrounds. That’s why we’re committed to hiring people regardless of race, religion, colour, national origin, sex, sexual orientation, gender identity, age or disability.