Remote (Senior or Staff) Backend Engineer, AI tooling

Synthesia Limited; United States; Remote; USD 119,000 - 185,000; Full time

Benefits offered by this job

25 days leave

Visa sponsorship (UK/EU)

Remote-friendly environment

Job summary

Synthesia Limited is hiring a Remote Senior or Staff Backend Engineer for AI tooling on the Developer Platform. You’ll own end-to-end architecture, ship scalable tooling, and ensure production reliability while accelerating engineering velocity in an AI‑first environment.

Based in or capable of working from Leicester, UK, or other supported European locations, you’ll collaborate across teams, shape platform decisions, and lead initiatives spanning quarters with a focus on observability, CI/CD,

Qualifications

• At least seven years as a software engineer with 2–3 years in senior/staff capacity.
• Hands-on experience building and operating developer platforms and CI/CD systems.
• Experience shipping tooling that improved developer velocity or reduced cognitive load.
• Proven track record adopting AI-powered developer tools across an engineering organization.
• Experience in high-performing teams where infra choices affect velocity and quality.
• Experience integrating third-party services with focus on reliability and security.

Responsibilities

• Own architectural decisions for features, from design to production release.
• Lead projects spanning quarters and break down problems into milestones.
• Ensure operational health of systems and use data to drive iterations.
• Drive adoption of AI-powered tooling and improve developer productivity.

Skills

Software engineering

CI/CD systems

Observability

Code quality automation

Testing infrastructure

Developer tooling

AI-powered tooling adoption

Platform ownership

Job description

Remote (Senior or Staff) Backend Engineer, AI tooling

Leicester

Leicestershire

GB

LE1 5

Any

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.

The Developer Platform team builds internal tools and platforms that improve the velocity, quality, and developer experience of Synthesia's engineering teams. They own developer productivity (from code commit to production), developer insights and SDLC metrics, developer infrastructure (CI/CD systems), AI-assisted QA/testing, and AI-assisted development. AI Adoption has grown to 90%+ employees, with 100% adoption in engineering in the last 8 months.

You’ll have a big surface area and real ownership from day one, making Synthesia’s engineering go faster while maintaining quality in this era of AI-driven development. You will work end-to-end, owning the architectural decisions that govern how features are built, released safely to customers, and supported long-term. You will lead projects spanning quarters, breaking down complex problems into milestones that can be validated iteratively. You will own the operational health of systems you build and use data to drive decisions about iteration, maintenance, and deprecation.

Requirements include:

• At least seven (7) years of experience as a software engineer, with at least 2-3 years in a senior/staff level role.
• Proven hands-on experience building and operating developer platforms, CI/CD systems, observability/metrics infrastructure, code quality automation, testing infrastructure, and developer tooling.
• Experience shipping infrastructure or tooling that measurably improved developer velocity or reduced cognitive load.
• Previous experience leading the adoption of new AI-powered developer tools or capabilities across an engineering organization.
• Experience operating in a high-performing engineering organization where infrastructure choices directly impact team velocity and product quality.
• Experience integrating third-party services (APIs, SaaS tools, external platforms) into internal systems, with attention to reliability, security, and user experience.
• Clear understanding that platform and infrastructure work directly enables commercial outcomes.

We re living the golden age of AI. At Synthesia, we re passionate about building, not talking, planning, or politicizing. We re trusted by leading brands such as Heineken, Zoom, Xerox, McDonald's, and more.

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. While the full scope of AI’s impact on society is still unfolding, our position is clear: Learn more about our commitments to AI Ethics, Safety & Security.

Additional interview process includes:

• 45-minute call with an Engineering Manager about your past projects
• 90-minute Product Discovery/Implementation, a collaboration exercise with our Engineer (not Leetcode style, in Python)

Our preferences for this role:

• Based either in-office or remote in Leicester, UK, or in other supported European locations (subject to compliance and right-to-work checks)
• Full-time employment only - no contractors possible - usually through OysterHR
• Everyone at Synthesia gets 25 days of leave plus local holidays (no extra paid or unpaid leave possible)
• VISA sponsorship available only if you are already in the UK/EU and need support - we do not relocate people.