Senior Software Engineer (Node + React)£90,000 + Bonus + BenefitsLocation: Soho, LondonHybrid: 2 days per week in the officeThe OpportunityOur 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 ChallengeThe team is looking for engineers who can:Provide technical direction and sound judgementThink critically about priorities, architecture, trade-offs, and impactAsk the right questions before diving into implementationCollaborate effectively and feel comfortable discussing solutions rather than following scriptsThey''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 ForExperienceIdeally 5+ years of commercial experienceExperience with NodeJs and ReactJsIndustry is open (financial services experience may not be the best fit)MindsetSelf-starter who can take ownershipComfortable leading solutions without formal authorityAnalytical, thoughtful, and curiousCollaborative rather than siloedInterview Process1-hour competency-based interview with the Engineering D