> Markdown version of [/jobs/ext/2466058-software-engineer-front-end-leaning-agents](https://www.wearedevelopers.com/jobs/ext/2466058-software-engineer-front-end-leaning-agents). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Software Engineer, Front End Leaning, Agents - **Company:** Synthesia Limited - **Location:** London, UK (Remote available) - **Experience:** Experienced - **Salary:** £130,000.0 - **Contract:** Permanent contract - **Skills:** Artificial Intelligence, Business Logic, Node.Js, TypeScript, Web Applications, WebSocket, Datadog, ReactJS, Large Language Models, Grafana, Backend, Sentry, Low-code, Front End Software Development - **Published:** August 5, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=00fecd00e134ea8d ## About the Role * 4-6+ years of frontend engineering experience, primarily TypeScript and React, and backend knowledge to take features end to end with NodeJS * Experience working on a large, complex web application - ideally something where users build, configure, or create: an editor, design tool, no-code/low-code platform, workflow builder, or similar * Comfortable owning frontend features independently, from UI through state management and application logic * Familiar with real-time interactions (e.g. WebSockets, live collaboration patterns) * Strong product mindset - you think about what users actually need, not just what was specced Nice to have * Experience with AI-powered features, agent interfaces, or LLM-integrated products * Observability experience - monitoring and improving frontend performance using tools like Datadog, Sentry, or Grafana * Complex state management in large frontend applications, * Tech Recruiter Interview (30-40min) - Technical background, previous experience, and what you're looking for * Delivery and Impact Interview (60min) - Deep dive into your past projects, impact, and ways of working ## Description Synthesia videos are becoming two-way experiences. Our Video Agents team is building the next generation of interactive learning - moving beyond passive video into AI-driven conversations, surveys, and knowledge checks that learners actually engage with. Think: a sales rep completing a roleplay with an AI avatar, a learner answering quiz questions mid-video, a manager seeing who's ready to go live with customers. As a Frontend Engineer on this team, you'll build directly inside our editor - the core creative surface where content creators design these experiences - and extend our video player where learners consume them. You're not just adding features; you're defining new types of AI agents from scratch: configurable, interactive, and deeply integrated into Synthesia's platform end-to-end. What you'll work on * Building new agent types inside our editor - survey agents, knowledge-check agents, quiz flows - that creators configure and learners interact with in real time * Owning features end-to-end: from the editor UI through app state and logic, down into the player experience * Working primarily in our editor (a large, complex React + TypeScript application) with some work in our video player * Collaborating closely with product and design to shape what these new interaction patterns look like - and pushing back when something isn't right * Making small backend changes when needed to unblock frontend work, 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., + Live Coding Interview (75-90min) - Hands-on problem solving (not Leetcode style); collaboration exercise with one of our engineers. AI-assisted coding welcome. + System Design Technical Discussion (60min) - Real architectural problems we've faced in production + Leadership Retrospective (60min) - Examples of collaboration and growth; your future manager or VP of Engineering will outline your role and what's ahead * Final debrief on our side which leads to an offer or the end of the process. You can find more details on what to expect and how to prepare HERE. The process does not need to take long - we can be done in two weeks time. ## Related Videos - [Debugging in the Dark](https://www.wearedevelopers.com/videos/1658-debugging-in-the-dark) - [From Doubt to Confidence: How Sentry Uses Verdaccio to Bulletproof SDK Releases](https://www.wearedevelopers.com/videos/739-from-doubt-to-confidence-how-sentry-uses-verdaccio-to-bulletproof-sdk-releases) - [Stop using Node.js like in 2020! 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