Senior Software Engineer (Node + React)

£90,000 + Bonus + BenefitsLocation: Soho, LondonHybrid: 2 days per week in the office

The Opportunity

Our client are hiring three Senior Software Engineers to join a growing engineering function that builds technology powering large-scale advertising and media platforms.

This is a hands-on senior role for engineers who enjoy thinking about the “why”, not just the “how”. You’ll help shape technical decisions, guide less experienced engineers, and contribute to building well-designed, scalable systems used across major advertising campaigns.

The Challenge

The team is looking for engineers who can:

• Provide technical direction and sound judgement
• Think critically about priorities, architecture, trade-offs, and impact
• Ask the right questions before diving into implementation
• Collaborate effectively and feel comfortable discussing solutions rather than following scripts

They’ve met candidates who look strong on paper but struggle to explain their reasoning - this role is for someone who can clearly articulate how and why they solve problems.

What They’re Looking For

Experience

• Ideally 5+ years of commercial experience
• Experience with NodeJs and ReactJs
• Industry is open (financial services experience may not be the best fit)

Mindset

• Self-starter who can take ownership
• Comfortable leading solutions without formal authority
• Analytical, thoughtful, and curious
• Collaborative rather than siloed

Interview Process

1. 1-hour competency-based interview with the Engineering Director
2. Final onsite interview - problem-solving session using a whiteboard
   • Focuses on approach, reasoning, and collaboration, not coding syntax