S

Synthesia

AI video platform for enterprise training

Principal ML Platform Engineer - ML Platform

Full-Time
No salary listed
Expert
Remote in UK+1 moreMore locations: London, UK
Remote
DevOps & InfrastructurePlatform Engineering

About the job

Requirements
  • Strong experience building or operating production systems with a focus on reliability, scalability, and maintainability.
  • A systems mindset involving bottlenecks, failure modes, interfaces, resource usage, and long-term operability.
  • Hands-on experience with cloud infrastructure, Linux, and infrastructure automation.
  • Experience with Kubernetes and operating distributed workloads in production.
  • Strong coding skills, ideally in Python or similar languages used for backend systems and tooling.
  • Judgment around where automation adds leverage and where human control and reliability matter most.
  • Experience building internal platforms, developer tooling, or infrastructure abstractions used by other engineers.
  • Comfort working in ambiguous environments and taking ownership of open-ended technical problems.
  • A pragmatic approach focused on solving the right problem without over-engineering.
Responsibilities
  • Design and improve platform systems that support model training, evaluation, and production serving.
  • Build infrastructure and tooling that make machine learning workloads more reliable, scalable, and cost-efficient.
  • Develop internal tools and workflows that are easy to operate by both humans and agents.
  • Work on the architecture behind how models are deployed, served, and operated across research and product environments.
  • Improve how workloads running on GPUs and cloud infrastructure are scheduled, monitored, and debugged.
  • Develop internal tools, abstractions, and agentic systems that reduce operational overhead for researchers and engineers.
  • Drive improvements across observability, automation, reliability, and developer experience.
  • Collaborate with researchers and product engineers to understand pain points and turn them into robust platform capabilities.
  • Contribute to technical direction and make pragmatic architectural tradeoffs as the platform grows.
Desired Qualifications
  • Experience operating machine learning infrastructure or model serving systems in production.
  • Experience supporting research or data-intensive workloads.
  • Experience working with GPU-based systems or other performance-sensitive infrastructure.
  • Experience with observability and debugging in distributed systems.
  • Familiarity with Terraform, Datadog, GitHub Actions, or similar tools.
  • Experience building agentic or large language model-powered internal tools.
  • Experience with workflow orchestration systems such as Temporal.
  • Experience working at the boundary between research and production engineering.
  • Familiarity with performance optimization, scheduling, or resource allocation problems.
  • Experience building lightweight product or developer-facing tools.

About the company

Synthesia builds an AI video creation platform that turns text, documents, or web pages into videos using AI avatars and synthetic voices, without cameras or studios, for enterprise training, marketing, and internal communications. Users input content, choose from 240+ stock avatars or create brand avatars, and pick a language from 160+ languages; the system generates a video hosted in the cloud featuring the selected avatar speaking the script. It differentiates itself with a large avatar library, brand customization, and collaboration tools for enterprise customers, including Amazon, Zoom, and SAP. Its goal is to help organizations produce personalized, scalable video content with AI avatars to replace traditional video production.

Company Size

501-1,000

Company Stage

Series E

Total Funding

$549.8M

Headquarters

London, United Kingdom

Founded

2017

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Simplify's Take

What believers are saying

  • Synthesia says 90% of Fortune 100 customers and 140% net revenue retention.
  • The company signed several seven-figure contracts in 2026 for interactive products.
  • Its API and custom-avatar studio expand into training, marketing, and internal communications.

What critics are saying

  • Synthesia suffered major login outages in July 2026 and degraded performance in September.
  • HeyGen, D-ID, and Colossyan undercut Synthesia on price, languages, and avatar variety.
  • Synthetic spokesperson tools trigger consent, authenticity, and misinformation backlash that can stall enterprise procurement.

What makes Synthesia unique

  • Synthesia’s July 2026 Sessions turns videos into scored roleplay conversations.
  • Its January 2026 Series E from GV, NVIDIA, and Accel confirms enterprise conviction.
  • The September 2026 New York HQ and customer studio deepen U.S. deployment and sales.

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Benefits

  • Health Insurance
  • Dental Insurance
  • Vision Insurance
  • 401(k) Retirement Plan
  • Stock Options
  • Hybrid Work Options
  • Paid Vacation
  • Paid Sick Leave
  • Parental Leave

Growth & Insights and Company News

6 month growth

0%

1 year growth

0%

2 year growth

-2%
AIor
Oct 12th, 2026
Synthesia launches Syren: video and motion graphics from a single prompt.

Synthesia launches Syren: video and motion graphics from a single prompt. Synthesia's new Syren tool generates studio-quality AI video with motion graphics, avatars, and voiceover from a text prompt. Here's what it means for the $29/month platform. #synthesia #syren #ai video #motion graphics #ai news Some links are partner links: if you subscribe through them, we may earn a commission, at no extra cost to you. The crowd verdicts stay independent. Synthesia launched Syren on October 9, 2026: an AI video agent that generates studio-quality video with motion graphics, 3D elements, avatars, and voiceover from a single prompt. The tool marks Synthesia's expansion beyond avatar-only video into full creative production. The quick verdict on Syren Syren creates on-brand video from a text prompt or document, rendering motion graphics, avatars, and voiceover live. First 1,000 waitlist users get 5,000 bonus credits. A 2-minute video consumes 1,000 to 2,000 credits. What Syren actually does. Traditional AI avatar platforms like Synthesia and HeyGen generate talking-head presenters. You write a script, pick an avatar, and export. Syren takes a different approach: describe the video you want (or upload a document), and the tool writes it as code and renders it live. Three steps define the workflow: * Brand Kit creation: Syren learns from your existing videos, capturing colors, typography, animation style, and pacing. * Prompt input: Describe your video, add images or files, or pick a quick-start use case. * Chat refinement: Instead of timeline editing, you refine via conversation: swap the avatar, change the script, restyle a scene. The output includes motion graphics, 3D elements, voiceover, music, and avatars in a single render. Synthesia calls this "studio-quality video in one shot." How Syren compares to Synthesia's core product. Synthesia's main platform remains the corporate AI video standard. At $29/month (Starter) or $89/month (Creator), it delivers Express-2 avatars in 160+ languages with SCORM export for enterprise training. The crowd score sits at 57% recommend on GLAD-AI-TOR, reflecting solid utility but also common complaints about content moderation delays and minute quotas. | Feature | Synthesia Core | Syren | | Input | Script + avatar selection | Text prompt or document | | Output | Avatar presenter video | Full video with motion graphics, 3D, avatars | | Editing | Scene-by-scene editor | Chat-based refinement | | Brand consistency | Brand kits (manual setup) | Auto-learns from existing videos | | Pricing | $29 to $89/month (credit-based) | Beta, credit consumption TBD | The key difference: Synthesia Core builds presenter videos. Syren builds complete creative videos. For a product launch explainer or a motion-graphics-heavy ad, Syren promises to eliminate the need for separate B-roll, animation, and avatar workflows. What about credit consumption? Synthesia's pricing restructure in 2026 cut list prices about 38%, landing Starter at $29/month (1,250 credits) and Pro at $89/month (6,000 credits). But Syren's credit burn is the open question. Synthesia states a 2-minute video with up to two edits typically uses 1,000 to 2,000 credits. At that rate, the $29 Starter plan yields roughly one Syren video per month. The $89 Creator plan offers more headroom: 3 to 6 videos depending on complexity. The waitlist promotion gives the first 1,000 eligible users 5,000 bonus credits, enough to test the tool before committing to a paid plan. The corporate AI video standard: 240+ stock avatars in 160+ languages with Express-2 realism on every plan, from $29/month $29/mo 57%(3) Partner link. The crowd verdicts stay independent. Who should care about Syren. Syren targets a specific gap in AI video: on-brand creative production without an agency. If you need training videos or multilingual internal comms, Synthesia's core product already handles that well. Syren aims at marketing teams, product managers, and small studios who need motion-graphics-driven explainers, launch videos, or social ads. That said, Synthesia's DNA is corporate training. Clients include PepsiCo, Heineken, and 90%+ of the Fortune 100. Solo creators and sellers are not the primary audience, and the credit economics may prove expensive for high-volume social content. For direct avatar comparison, HeyGen remains the UGC ad and digital twin leader. Avatar V (April 2026) achieves 0.840 face similarity in tests, and the platform specializes in realistic spokesperson videos. Syren is not competing on avatar realism; it is competing on creative automation. The motion graphics angle. Synthesia also shipped Flux 3 B-roll generation in October 2026, allowing up to 20 seconds of B-roll in a single prompt with native audio sync. Combined with Syren, the platform now covers: * Avatar presenters (Express-2) * AI-generated B-roll (Flux 3) * Full creative video (Syren) The Synthesia MCP integration (public beta) lets users create videos end-to-end inside ChatGPT or Claude, maintaining brand consistency. For teams already using LLM workflows, this could reduce context-switching. The corporate AI video standard: 240+ stock avatars in 160+ languages with Express-2 realism on every plan, from $29/month $29/mo 57%(3) Partner link. The crowd verdicts stay independent. The verdict. * Syren is not a standalone product: it is a new capability within Synthesia, accessible via the same subscription and credit system. * Credit consumption is the risk: 1,000 to 2,000 credits per 2-minute video means the $29 Starter plan is effectively a single-video test. * Best fit: marketing teams and product managers who need on-brand explainers, launch videos, or motion-graphics-driven content without hiring an agency. * Not a fit: high-volume social creators (credit burn adds up) or teams needing hyper-realistic avatars (HeyGen's Avatar V leads there). * Next step: join the waitlist, claim the 5,000 bonus credits, and test whether Syren's brand-learning actually delivers consistency across multiple videos. For the full comparison between Synthesia and HeyGen, see the Synthesia vs HeyGen head-to-head with live crowd scores from the GLAD-AI-TOR community. Keep exploring Every claim above is backed by the arena's live data: crowd votes, verified pricing, honest pros & cons.

Connect CRE
Oct 8th, 2026
AI video platform Synthesia leases 50K SF for new U.S. Headquarters.

AI video platform Synthesia leases 50K SF for new U.S. Headquarters. Lee & Associates NYC announced that Synthesia, an AI video platform for business, has signed a 50,000-square-foot lease at GFP Real Estate's 675 Ave. of the Americas for its new U.S. headquarters. The company has relocated from 245 Fifth Ave., where it previously occupied approximately 13,000 square feet. Dennis Someck and Justin Myers of Lee & Associates NYC represented Synthesia in the transaction. Jeffrey Gural and Alphie Toro of GFP Real Estate, along with Anthony Sciacca and Scott Gutnick of Newmark, represented the landlord, GFP Real Estate. The lease represents a nearly fourfold expansion of Synthesia's New York City footprint and is part of a broader U.S. growth strategy. The company has more than 250 employees in the U.S., including approximately 140 in New York, and plans to add more U.S. roles by the end of 2026. "As a fast-growing AI hub, New York is attracting the talent and innovation energy we need to scale," Laura Gonzalez, chief of staff at Synthesia, wrote in a blog posting.

Unite.AI
Oct 1st, 2026
Synthesia launches Sessions platform for interactive AI avatars.

Synthesia launches Sessions platform for interactive AI avatars. Published October 1, 2026 Aiden Cross, AI Product Strategy & Execution AI Research Agent Synthesia on October 1, 2026, launched Sessions, a platform for two-way conversations with lifelike AI avatars, with Roleplay and Survey Sessions available the same day and a third session type, Expert Sessions, announced as coming soon. Chief Technology Officer Peter Hill announced the launch in a company blog post. A ready-made platform beside the Interactive Avatar API. Synthesia said Sessions gives people real, back-and-forth conversations with a lifelike avatar for practice, gathering insight, and expert guidance, at a scale a person never could. Hill compared the experience to joining a regular video call, except the other side is an avatar that can be spoken to like a coworker available 24/7, in any language, from anywhere in the world. The company described two routes for businesses bringing such interactive AI experiences to life: its Interactive Avatar API, for companies that want to build their own avatar products and services on their own terms, and Sessions, its ready-made platform for the AI-to-human conversations that make up daily work. The launch extends what Synthesia calls the world's largest enterprise platform for video creation, collaboration and distribution, built over the past decade. Hill's stated rationale is a staffing bottleneck: there is never enough of the right person to go around, whether a manager coaching every sales rep before a hard call, a researcher interviewing every customer, or a product expert guiding every user who gets stuck. The usual substitutes, he wrote, are a recording instead of a rehearsal, a form instead of an interview, and a help doc instead of hands-on guidance. Hill, formerly CEO and CPO at Wildlife Studios, spent nearly 25 years at Amazon and AWS leading teams behind Kindle, Fire, Alexa, and services including Amazon Connect and WorkSpaces, according to the biography published with the post. Roleplay Sessions gains personalization and custom roleplays. Roleplay Sessions is live with the launch. Participants practice important conversations with an avatar that responds and pushes back, then get coached and scored in real time. Listed uses include sales teams practicing discovery and objection handling, managers rehearsing difficult employee conversations, and support teams simulating customer escalations. New capabilities let people personalize a scenario to their exact situation before they practice, and companies can build custom roleplays for any conversation. Synthesia said thematic insights show which skills actually drive performance rather than only surfacing who scored highest, and each employee receives suggested roleplays to close their gaps, a shift the company characterizes as moving its analytics from describing scores to diagnosing gaps. The Sessions product page documents additional roleplay categories, including onboarding and ramp, retail and field conversations, and compliance and tough talks. It also describes instant, consistent feedback after each attempt and a single manager dashboard that tracks scores, skill breakdowns, and progress across attempts for every learner and team. Across deployments, 78% of learners returned to attempt a roleplay more than once and, of those, 83% improved their score on a later attempt, Synthesia reported. The company called the figures a strong signal that practice through Sessions is translating into real skill gains. Synthesia said it had put Sessions into the hands of select customers ahead of general release. Tom Way, CEO of Hays UK and Ireland, said Roleplay Sessions is helping his organization explore new ways of delivering practical, engaging learning experiences and gives it a way to measure progress and coach more effectively. Emilie Porter-Rand, Director of Learning and Development at Xponential Fitness, said the tool will let her teams deliver consistent, high-quality practice at scale before they engage directly with customers. Pete Brooks, Global Head of Total Talent and Performance at LQRA, said the roleplays bring AI and human intelligence closer together for real-world problems. Survey Sessions and Expert Sessions. Survey Sessions, which Synthesia calls a brand-new type of Session, also launched on October 1, 2026, turning any survey or form into what the company describes as a human-like interview run at scale. An avatar asks the company's chosen questions one to one, follows up on what it hears, and hands back structured insight, an approach Synthesia says delivers interview-style depth at form-style scale. Stated uses include checking in with new hires, learning what problems customers are facing, and qualifying inbound leads before the sales team picks up the phone. The product page adds employee feedback, customer insight, exit and churn interviews, pulse and NPS follow-up, and product and market research as survey use cases. It documents an adaptive follow-up mechanic in which the avatar reacts to what each person says and probes deeper, and a single report that shows themes and sentiment across respondents, with any individual response openable as a transcript, audio, or a CSV file. Synthesia said Expert Sessions is coming soon: an avatar that knows a company's product and processes will guide people step by step and answer their questions as they go. Stated uses include onboarding new customers, walking employees through new tools, and troubleshooting common issues. Availability and enterprise terms. Both Roleplay and Survey Sessions are available from October 1, 2026, and can be tried free with no credit card required, according to the product page FAQ. The FAQ states that Sessions run on the Synthesia platform with SOC 2 Type II, ISO 27001, 27701 and 42001 certifications, plus GDPR compliance and SSO, and that a customer's security team reviews the platform once rather than once per session type. Synthesia said Sessions will not replace the brainstorm with a colleague, a coaching moment that needs to land exactly right, or the read of a room that only a person can make. For repetitive conversations that do not need a specific person every time, the company said, the platform can absorb the volume so people get their time back for the moments that do. Aiden Cross is an AI-generated research agent at Unite.AI, covering AI product strategy, execution, and the practical challenges of turning experimental models into scalable, market-ready products. His work focuses on how startups and enterprise teams move from prototypes and demos to reliable systems used by real customers. With a pragmatic and detail-oriented perspective, Aiden analyzes product roadmaps, go-to-market strategies, platform decisions, and organizational trade-offs that determine whether AI initiatives succeed or stall. He pays particular attention to deployment realities, user adoption, infrastructure constraints, and the alignment between technical capability and business value. Articles authored by Aiden Cross are AI-generated and reviewed by Unite.AI's editorial team to ensure clarity, accuracy, and responsible coverage of how AI products are built, shipped, and scaled in the real world.

CNBC
Oct 1st, 2026
Synthesia launches Sessions for AI avatar sales training with API rollout

Synthesia CEO Victor Riparbelli discussed the company's new Sessions product with Jon Fortt. Sessions transforms Synthesia's studio-quality AI video into interactive conversations with avatars. The product's initial application targets sales training. Employees watch instructional videos before role-playing with an avatar customer and receiving performance scores. According to Riparbelli, 78% of learners retry the role play, with 83% showing improvement. Synthesia has also launched an API. Riparbelli argued that most enterprise deployments no longer require a frontier model, suggesting smaller, more specialised AI systems can handle typical business use cases effectively.

HyperAI
Sep 26th, 2026
Journalist creates interactive digital avatar of self with Synthesia.

Journalist creates interactive digital avatar of self with Synthesia. Synthesia, a London-headquartered digital avatar startup valued at $4 billion, has expanded its enterprise offerings with personalized interactive AI avatars, recently demonstrated through a pilot project with a TechCrunch journalist. Following the company's September opening of its New York office, the journalist collaborated with Synthesia's corporate affairs team, led by Alexandru Voica, to develop a fully customized digital twin. The process involved capturing facial imagery and voice samples in a dedicated studio, after which Synthesia deployed a multi-model technology stack combining voice-to-text transcription, agentic large language models, text-to-speech synthesis, and proprietary video animation to create three distinct avatar variants. The interactive avatar was specifically trained on the journalist's reporting regarding venture-capital-backed startup fraud, strictly limiting its responses to that predefined knowledge base. Testing revealed high fidelity in voice replication and deterministic behavior, with the system successfully redirecting off-topic queries back to its core parameters. While testers noted a mildly uncanny realism, the technology proved functionally robust, underscoring Synthesia's broader commercial strategy. The company, which surpassed $100 million in annual recurring revenue last year, currently serves enterprises through three primary product lines: scripted video production platforms, interactive roleplay modules for employee training and sales coaching, and an open API enabling third-party integration of its synthetic media models. This pilot highlights a shifting corporate landscape where AI avatars are transitioning from experimental novelties to operational tools. Organizations are increasingly leveraging the technology for scalable customer service, public relations representation, and immersive learning environments. However, the deployment also surfaces ongoing concerns regarding media authenticity, data consent, and the preservation of human trust in automated communications. Industry observers note that while deterministic avatars offer predictable, brand-safe interactions, more open-ended models risk generating hallucinations or overstepping ethical boundaries. Despite initial skepticism, particularly among demographics accustomed to traditional media formats, corporate America is rapidly integrating synthetic personalities into daily workflows. As the technology matures, the boundary between human representation and algorithmic automation will continue to narrow, requiring clearer frameworks for transparency and user consent in an increasingly digital ecosystem. This news is intelligently aggregated by AI to deliver industry updates efficiently. It does not constitute opinions or advice.