Senior Backend Engineer – AI Tooling & Platform

synthesia

Greater London

Hybrid

GBP 110,000 - 150,000

Full time

12 days ago

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Benefits offered by this job

Equity (RSUs)

25 days leave + holidays

In-office or remote options

Visa sponsorship (UK/EU)

Job summary

Synthesia is seeking an experienced Senior Platform Engineer to own architectural decisions, improve developer velocity, and drive AI-powered tooling adoption. You’ll mentor engineers, partner with leadership on roadmaps, and ensure automation, observability, and robust CI/CD practices across the engineering organization.

You will operate with high autonomy, define success criteria, and balance shipping velocity with quality.

Qualifications

7+ years as a software engineer with 2–3 years in senior/staff capacity.
Proven hands-on experience building and operating developer platforms and CI/CD systems.
Experience with observability/metrics infrastructure, code quality automation, testing infrastructure, and developer tooling.
Led adoption of AI-powered developer tools across an engineering organization.
Worked in high-performing teams where infrastructure choices impact velocity and quality.
Experience integrating third-party services into internal systems with reliability and security in mind.
Ownership of large technical areas end-to-end.

Responsibilities

Own architectural decisions governing feature build and safe releases.
Mentor engineers and promote technical best practices via code review and design partnerships.
Lead multi-quarter projects with clear milestones and iterative validation.
Collaborate with leadership to shape roadmaps and technical strategy.
Manage operational health of systems and use data to guide iteration and deprecation.