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Principal Backend Engineer

Job in London, Greater London, W1B, England, UK
Listing for: Synthesia
Full Time position
Listed on 2026-09-03
Job specializations:
  • Software Development
    Software Engineer, Backend Developer, Software Architect, Cloud Engineer - Software
Job Description & How to Apply Below
Synthesia is the world’s leading AI video platform for business, used by over 90% of the Fortune 100. Founded in 2017, the company is headquartered in London, with offices and teams across Europe and the US. As AI continues to shape the way we live and work, Synthesia develops products to enhance visual communication and enterprise skill development, helping people work better and stay at the center of successful organizations.

Following our recent Series E funding round, where we raised $200 million, our valuation stands at $4 billion. Our total funding exceeds $530 million from premier investors including Accel, NVentures (Nvidia's VC arm), Kleiner Perkins, GV, and Evantic Capital, alongside the founders and operators of Stripe, Datadog, Miro, and Webflow.

TL:

DR If you're someone who'd rather optimize systems than org charts, if you get energized by hard technical problems instead of political ones, and if you want to work somewhere that actually ships: we should talk.

About the role

You will focus on friction points around primarily backend issues for all teams in Engineering (90 Engineers). How should we do inter-service testing? Some teams are using monorepo, others aren’t. How can we bring overall stability up? Generally steering BE in the right direction. In the near future, standardising things across all of Engineering and bringing R&D teams (another 40 Engineers and Researchers) closer.

You will have ownership of projects that span quarters, requiring you to have the ability to break a problem down into small steps that can be delivered and validated iteratively.

You will evaluate your own work, leveraging our data pipeline and frameworks that we have established to understand the impact your features have on our commercial objectives and pivoting where necessary.

You will consider the long-term direction of Engineering, making sure that we are developing the engineering capabilities that will allow us to stay ahead of the challenges we are likely to encounter in 12-18 months' time.

You will work end-to-end, from our client application written in React to our monolithic backend written in Python, and lead projects that span across multiple teams.

What we're looking for:

At least ten (10) years of experience as a software engineer, at least 2 at the Senior Staff/Principal level (L7+).Previous leadership experience in driving projects across multiple teams (50+ Engineers).Experience in a high-performing engineering Org that is operating s could come from a scale-up environment or a more established organization recognised for building and shipping with a great engineering culture.

An ability to work across the stack, with deep knowledge on server side and all things back end related.

Relevant engineering experience for a team building an enterprise-grade SaaS product. Extra points for delivering AI-powered video generation product, billing systems, experimentation platforms, video delivery systems, online editors, real-time collaboration and so on.

Strong alignment with commercial success.

Why join us?

We’re living the golden age of AI. The next decade will yield the next iconic companies, and we dare to say we have what it takes to become one. Here’s why,Our culture

At Synthesia we’re passionate about building, not talking, planning or politicising. We strive to hire the smartest, kindest and most unrelenting people and let them do their best work without distractions. Our work principles serve as our charter for how we make decisions, give feedback and structure our work to empower everyone to go as fast as possible. You can find out more about these principles here.

Serving 50,000+ customers (and 90% of the Fortune 500)
We’re trusted by leading brands such as Heineken, Zoom, Xerox, McDonald’s and more. Read stories from happy customers and what 1,200+ people say on G2.Proprietary AI technology

Since 2017, we’ve been pioneering advancements in Generative AI. Our AI technology is built in-house, by a team of world-class AI researchers and engineers. Learn more about our AI Research Lab and the team behind.

AI Safety, Ethics and Security AI safety, ethics, and security are fundamental to our mission.…
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