Staff Software Engineer, Voices at Synthesia

✨ The Stack take on this Synthesia job

• 🏢 Synthesia has 7 jobs here, 7 with visa sponsorship see all
• 🛂 Skilled Worker visa. Standard minimum salary: £41,700 a year guide

Updated 2026-11-05, from our data and official sources.

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About the role

Responsibilities:
- Design and operate backend services that orchestrate multiple TTS providers and in-house voice models to deliver consistent voice synthesis.
- Build robustness layers (retries, throttling, failover) and request routing to handle provider variability and maintain quality.
- Implement persistence and caching strategies so regenerated outputs remain consistent and reproducible.
- Improve storage, retrieval, and reuse of voice assets; add telemetry for quality and performance monitoring.
- Collaborate with frontend, product, and R&D teams to shape APIs and user-facing workflows.
- Lead initiatives for voice discovery and recommendation, including evaluation systems and observability.

Requirements:
- Several years building and operating backend systems in production; strong Python and FastAPI (or similar) experience.
- Experience designing reliable, observable distributed services and working with third-party APIs.
- Solid understanding of persistence, caching, and strategies to ensure output consistency across regenerations.
- Product-oriented mindset: ability to connect backend work to user experience and product metrics.
- Familiarity with observability tooling (Datadog, metrics, tracing) and cloud infrastructure best practices.

Responsibilities

You will design and evolve backend services that orchestrate text-to-speech providers and in-house models to ensure high-quality voice generation. You will also build robustness layers and persistence systems while collaborating with cross-functional teams to improve voice discovery and recommendation logic.

Requirements

You must have several years of experience building and operating backend systems in production, specifically with Python and FastAPI. You should possess a strong product mindset and experience designing reliable, observable services, with a willingness to work across the stack when necessary.

Key skills

• Python — in 1200 other listings on The Stack
• FastAPI — in 91 other listings on The Stack
• Backend development — in 171 other listings on The Stack
• Distributed systems — in 342 other listings on The Stack
• API design — in 192 other listings on The Stack
• System architecture — in 171 other listings on The Stack
• Observability — in 305 other listings on The Stack
• Datadog — in 71 other listings on The Stack
• Temporal
• Generative AI
• Text-to-speech
• Cloud services
• Software engineering
• Performance optimization

On The Stack (as of 2026-11-05)

• Synthesia has 6 other listings on The Stack, 6 of them marked as offering visa sponsorship.
• 214 visa-sponsored jobs in the United Kingdom on The Stack, posted in the last 60 days.
• 195 visa-sponsored software engineer jobs in Europe on The Stack, posted in the last 60 days.

Frequently asked questions about Synthesia

Is this Staff Software Engineer, Voices role still open?

It was posted on 2026-04-22. Listings more than 30 days old may no longer be active, so check Synthesia's site before applying.

Does Synthesia offer visa sponsorship?

This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on Synthesia's site.

Where is this role located?

The listing gives the location as London, United Kingdom. It is marked remote.

What skills does this role ask for?

The listing names: Python, FastAPI, Backend development, Distributed systems, API design, System architecture, Observability, Datadog, Temporal, Generative AI, Text-to-speech, Cloud services, Software engineering, Performance optimization.