# Staff Software Engineer, Voices at Synthesia

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> Responsibilities: - Design and operate backend services that

- **Company:** Synthesia (https://jobs.trythestack.co/companies/synthesia)
- **Location:** London, United Kingdom
- **Work arrangement:** Remote
- **Employment type:** Full-time
- **Experience level:** 5–10 years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** Python, FastAPI, Backend development, Distributed systems, API design, System architecture, Observability, Datadog, Temporal, Generative AI, Text-to-speech, Cloud services, Software engineering, Performance optimization
- **Posted by employer:** 2026-04-22
- **Added to The Stack:** 2026-04-22
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://jobs.ashbyhq.com/synthesia/dfe4614e-040d-4447-885b-8f0827428f6e (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/staff-software-engineer-voices-synthesia

## 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.

## FAQ

- **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.

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## Notes for agents

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