Backend Engineer at London-based voice AI startup

Backend Engineer

Salary: Not Disclosed

Company: London-based voice AI startup building real-time interpretation infrastructure

Location: London, UK

Job Description: As the second backend engineer, you will work directly with the technical founder to build the production-grade infrastructure powering real-time voice interpretation. You will own the core architecture from scratch, designing a unified API platform that preserves tone and intent across multiple languages, ensuring high concurrency and system reliability at scale.

Why this role is remarkable

• Direct impact as the second backend hire, working alongside the technical founder to design and build core infrastructure from the ground up rather than maintaining legacy systems.
• Tackle one of the hardest problems in voice AI: real-time interpretation that preserves tone and intent, moving beyond robotic word‑for‑word translation.
• Join a technical founding team with a working product already featuring multiple modes (translate, share, connect, meet) ready for production‑grade scaling.

What You Will Do

• Architect and maintain a unified AI API platform to package internal capabilities for high‑scale external use cases.
• Design and implement critical backend systems for billing, usage metering, and complex real‑time voice room infrastructure.
• Build and optimize high‑concurrency data pipelines and cloud infrastructure on Azure, incorporating automated scaling and load balancing.

The Ideal Candidate

• 4-8 years of experience building and scaling production‑grade backend systems with a high degree of autonomy and technical ownership.
• Strong proficiency in Python and solid experience with distributed systems, cloud infrastructure (specifically Azure), and database design.
• Experience with real‑time systems and high‑concurrency design, with the ability to build monitoring and analytics dashboards from scratch.

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