Senior Frontend Engineer

Arcus Search; Greater London; Hybrid; GBP 80,000 - 110,000; Full time

Benefits offered by this job

Hybrid work in Central London

Ownership of frontend architecture

Job summary

Arcus Search is partnering with an AI‑driven technology company to hire an experienced Frontend Engineer. You will own the production React application and steer frontend architecture across web and mobile, shaping technical direction and delivery.

You will work closely with backend and ML engineers to build, deploy and monitor features, driving reliability and performance with a small, autonomous team.

Qualifications

• Proven experience with React in production environments.
• Ability to take ownership of an existing production application.
• Cross‑platform development experience across web and mobile.
• Experience owning CI/CD pipelines and production deployments.
• Comfortable making architectural decisions independently.
• Experience integrating frontend apps with REST APIs.
• Strong problem-solving and rapid issue resolution skills.

Responsibilities

• Take ownership of an existing production React application.
• Drive frontend development across web and mobile platforms.
• Analyse inherited codebase and plan refactors or redesigns as needed.
• Define long-term frontend architecture and technical roadmap.
• Deliver new features while improving maintainability and performance.
• Build and manage CI/CD pipelines and deployments.
• Own deployments to production for web and mobile apps.
• Improve monitoring, observability and production reliability.
• Collaborate with backend and ML engineers to integrate services.

Skills

React

Ownership

Web & mobile

CI/CD

Architecture

REST APIs

Troubleshooting

Job description

Location: Central London (Hybrid – 3 days per week in the office)

We're partnering with an innovative technology company developing AI-powered software that transforms video data into actionable insights. Their flagship platform combines cutting-edge computer vision with intuitive applications used by customers globally, and they're now looking for an experienced Frontend Engineer to take ownership of the product as it moves fully in-house.

This is an opportunity to join a small, highly technical team where you'll have genuine ownership over the frontend architecture, technical direction and delivery across multiple platforms.

The Role

You’ll become the technical owner of an established production application built in React, taking responsibility for its continued evolution across web, iOS and Android.

You’ll be responsible for understanding the existing architecture, evaluating the current codebase and making key technical decisions around whether components should be maintained, refactored or redesigned.

Working closely with backend and machine learning engineers, you’ll build new functionality, improve reliability and own the complete release process across all supported platforms.

Responsibilities

• Take ownership of an existing production React application
• Drive frontend development across web, iOS and Android
• Analyse and understand an inherited codebase with limited historical knowledge
• Define the long-term frontend architecture and technical roadmap
• Deliver new features while improving maintainability and performance
• Build and manage CI/CD pipelines
• Own deployments to production, including web and mobile app releases
• Improve monitoring, observability and production reliability
• Integrate frontend applications with Python/FastAPI backend services
• Work independently while collaborating closely with a small engineering team

What They're looking For

• Strong commercial experience with React
• Experience taking ownership of existing production applications
• Cross-platform development experience across web and mobile
• CI/CD pipeline ownership and production deployment experience
• Comfortable making architectural decisions independently
• Experience integrating frontend applications with REST APIs
• Ability to troubleshoot production issues and deliver solutions quickly

Nice to Have

• Experience working within startup or scale-up environments
• Exposure to React Native or similar cross-platform frameworks
• Experience with monitoring or observability tooling
• Familiarity with Python/FastAPI environments
• Background building technical or engineering-focused software products

Why Join?

• High-impact role with complete ownership of a core product
• Small, collaborative engineering team with minimal bureaucracy
• Opportunity to shape the future technical direction of the platform
• Cutting-edge AI and computer vision technology
• Modern engineering environment with significant autonomy
• Hybrid working from a Central London office

Timing

This is an immediate priority hire. The business is reviewing applications as they arrive and is keen to move quickly for the right person.