Full Stack Developer

Artificial Intelligence; Greater London; On-site; GBP 100,000; Full time

Job summary

A leading AI video communications company based in Greater London is looking for a Senior Software Engineer to work on client applications using React and a Python backend. The ideal candidate will have at least seven years of experience in software engineering with a minimum of three years at a senior or lead level. Responsibilities include managing project deliverables, collaborating with product managers, and contributing to the success of enterprise-grade SaaS products. The position offers a competitive salary of £100,000 plus stock options, generous leave, and full-time employment.

Benefits

25 days of annual leave

Stock option plan

Qualifications

• At least seven years of software engineering experience, minimum three at senior/lead level.
• Experience in a high-performing engineering team operating at scale.
• Proficiency across the stack with deep backend knowledge.

Responsibilities

• Work end-to-end on client applications written in React and a monolithic Python backend.
• Own projects spanning months, breaking problems into small, iterative deliverables.
• Collaborate directly with product managers to shape product direction.

Skills

Software engineering experience

Backend development knowledge

Proficiency in React

Leadership experience

Job description

Responsibilities

• Work end‑to‑end on client applications written in React and a monolithic Python backend, and manage the safe release of features to customers.
• Own projects spanning months, breaking problems into small, iterative deliverables.
• Collaborate directly with product managers, ideate and focus on commercial problems, shaping product direction.
• Evaluate your own work using our data pipeline to understand impact on commercial objectives and pivot when necessary.

Interview Process

• 45‑min call with an Engineering Manager about past projects.
• 90‑min live‑coding interview (collaboration exercise, not LeetCode style).
• 60‑min system‑design discussion focused on real production problems.
• 45‑min call with leadership to discuss collaboration, growth, and team details.
• The process can be completed within seven working days.

Qualifications

• At least seven years of software engineering experience, minimum three at senior/lead level.
• Experience in a high‑performing engineering team operating at scale (start‑up or established environment).
• Proficiency across the stack, with deep backend knowledge; backend‑only is acceptable.
• Relevant experience building enterprise‑grade SaaS products (AI video generation, billing, experimentation, delivery, real‑time collaboration).
• Strong alignment with commercial success.
• Previous leadership experience of smaller teams is a plus.

Salary & Benefits

• Base salary starting at €100,000 (or £100,000 / CHF 100,000) plus stock option plan.
• Full‑time employment; contractors not accepted.
• 25 days of annual leave plus local holidays.
• Visa sponsorship only for UK/EU residents; relocation not supported.

About Synthesia

Synthesia is a leading AI video communications platform that simplifies creating, collaborating on, and sharing high‑quality videos for organizations worldwide. Companies such as Heineken, Zoom, and McDonald’s use our platform.