Frontend Engineer

Context & Vision

In 2026, writing code is no longer the primary bottleneck; managing its complexity and ensuring its reliability is. We are building a highly resilient advertising platform with a very lean, senior internal team, and we intend to keep it that way.

To achieve scale without the overhead of a large engineering department, we rely on an AI-first development paradigm and a philosophy borrowed from the best large-scale open-source projects. Our code is not public, but our governance is theirs: asynchronous communication, exhaustive written documentation, explicit rules, and uncompromising quality gates. It is the only way a small team of humans and AI agents ships serious systems without accumulating technical debt.

This role owns the entire product surface: the console through which advertisers and agencies run their campaigns.

The Role

You will own the frontend of the platform end to end — the advertiser and agency console where campaigns, audiences, creatives and reports come to life. This is the most visible part of the build and, today, the least finished; you will have real ownership and a large surface to shape.

• The Advertiser & Agency Console.** Build and own the product UI: campaign and line-item management, inventory, creative assets, reporting dashboards, account and admin modules, and the conversational agent interface. You are responsible for how the product feels to use
• A Typed, Contract-First Client.** Our frontend consumes the backend through a typed, contract-first client. You keep the contract tight: no drift between what the backend promises and what the UI assumes
• A Real Design System.** The product is standardising on a proper design system. You will own its implementation, keep components consistent, accessible and internationalised (FR / EN / AR), and work with the studio on the visual direction rather than reinventing it per screen
• AI-First Delivery & Governance.** We expect AI to write most of the code; you are the editor, not the typist. You specify work as explicit, self-sufficient issues, direct agentic tooling to implement, and gatekeep every diff. Components, patterns and decisions are documented. If it is not written down, it does not exist

The Tech Stack

• Core: modern React, TypeScript
• UI:a component library and a shared design system; data visualisation
• State & Data: server-state and client-state tooling, typed API clients
• Testing: end-to-end and unit testing
• i18n: multi-language (FR / EN / AR)
• Cloud: Google Cloud Platform

Profile & Requirements

We are looking for a senior frontend engineer who owns a product surface with taste and rigour, and who is comfortable in a lean, high-quality, AI-first environment. This role is not suited to someone who wants a narrow slice of screens inside a large team.

• 4+ years building and shipping production React applications, with real ownership of a non-trivial product surface
• Deep TypeScript, modern React, and a component-library-based UI used at scale
• Experience with server-state tooling and typed API consumption
• A real testing habit (end-to-end and unit) and attention to accessibility and internationalisation

Core Competencies & Mindset

• AI Development Lifecycle: genuine proficiency editing and validating AI-produced code, and turning ambiguous product goals into specifications an agent can execute
• Product Sense & Craft: you care how it feels, not only that it renders. Hierarchy, states, and consistency are not afterthoughts
• Uncompromising Quality: a focus on performance, correctness and maintainability across a large surface, not just the happy path
• Written & Asynchronous: exceptional written communication; effective in a distributed, async environment (Paris timezone +/- 3h). You document your components and decisions and do not wait to be asked

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.