Software Engineer, L5 (Front End Platform)

Welcome to the video first world

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From your everyday PowerPoint presentations to Hollywood movies, AI will transform the way we create and consume content. Today, people want to watch and listen, not read — both at home and at work. If you’re reading this and nodding, check out our brand video.

Despite the clear preference for video, communication and knowledge sharing in the business environment are still dominated by text, largely because high-quality video production remains complex and challenging to scale—until now….

Meet Synthesia

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We're on a mission to make video easy for everyone. Born in an AI lab, our AI video communications platform simplifies the entire video production process, making it easy for everyone, regardless of skill level, to create, collaborate, and share high-quality videos. Whether it's for delivering essential training to employees and customers or marketing products and services, Synthesia enables large organizations to communicate and share knowledge through video quickly and efficiently.

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.

In February 2024, G2 named us as the fastest growing company in the world. Today, we're at a $2.1bn valuation and we recently raised our Series D. This brings our total funding to over $330M from top-tier investors, including Accel, Nvidia, Kleiner Perkins, Google and top founders and operators including Stripe, Datadog, Miro, Webflow, and Facebook.

What you will be doing:

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In this role, you’ll own the foundations of our frontend platform end-to-end, ensuring our Studio web app can scale while remaining fast, stable, and a joy to build on. You’ll focus on three core areas:

• Performance – building architecture and systems that keep the app fast at scale.
• Stability and observability – ensuring our apps are reliable, resilient, and easy to debug.
• Developer experience and velocity – creating tooling, processes, and infrastructure that help product engineers ship features with confidence.

You’ll lead initiatives that cut across multiple teams — from evolving build tooling and scaling our CI/CD pipelines, to creating internal libraries and SDKs used throughout the company. You’ll balance hands-on engineering with architectural decisions, making sure our frontend stack stays robust and future-proof.

Your work will directly empower other engineers: while they focus on features, you’ll take care of the platform, tooling, and architecture that makes rapid iteration possible.

What we’re looking for

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• 5+ years of experience as a frontend engineer with a strong expertise in React and modern web architecture.
• Previous experience working in a frontend platform team of a growing B2B SaaS company.
• Hands-on experience with tooling and CI/CD systems at scale — you’ve helped teams deploy fast and safely in large monorepos or similar environments.
• Proven track record of leading initiatives that improved developer experience, platform stability, or performance across multiple teams.
• Strong architectural mindset: able to break down monoliths, design scalable systems, and improve app-level observability.
• Experience balancing infrastructure and product impact.
• A proactive mindset: you anticipate problems, rally stakeholders, and deliver solutions end-to-end without waiting for direction.

Why join us?

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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.

The hiring process:

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1. 30-40min call with one of our technical recruiters

2. 60-minute call with our Frontend Platform lead, where we’ll dive into your past projects (30min) and walk through a short System Design exercise (30min).

3. Take-home assignment (no alternative is offered) - does not have a deadline and is syntax-agnostic, so you're welcome to use the tools and languages you're most comfortable with. That said, we strongly prefer contributions using our core stack: React/TypeScript on the frontend

4. 60min technical discussion about your take-home assignment

5. 30min call with leadership

Depending on your availability, this process can be finished within 7 working days.

Other important info:

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• A remote-friendly or hybrid environment for candidates based in Europe. You can work fully remote if this is your preference or hybrid from London, Munich, Zurich or Copenhagen offices.
• Base salary starts at EUR/GBP/CHF 100.000 base + stock option plan.
• This is full-time employment only - no contractors possible - usually through OysterHR.
• Everyone at Synthesia gets 25 days of leave + local holidays.
• Visa sponsorship possible only if you are based in a UK/EU country already - we’re unable to relocate candidates.