Top Tech Jobs & Startup Jobs in London

Build, deploy and optimise high-volume multi-channel CRM campaigns in Braze using Liquid, regex and HTML/CSS. Collaborate with data, engineering and campaign teams to target segments, ensure accurate personalization, track campaign performance, troubleshoot platform issues, document processes and provide insights to improve engagement and conversion.

The Senior Backend Engineer will develop features, improve code quality, mentor others, and manage the development lifecycle while focusing on customer priorities and technical decisions.

Lead Ads Strategy & Operations to scale Trainline Advertising: shape go-to-market plans, create sales enablement, set ad delivery and measurement standards, manage ad tech stack and partner relationships, and lead Operations, Account Management and Client Success to drive retention, growth and commercial targets.

Join Trainline as a mid-level Site Reliability Engineer to improve platform reliability and observability, participate in incident response and on-call rotation, build and maintain monitoring/alerting, support AWS-hosted infrastructure using IaC and CI/CD (Terraform, GitHub Actions), collaborate with product teams, and write scripts and tooling to improve reliability and scalability.

Build and improve Trainline's infrastructure platform using Terraform and AWS, automate tasks with Node.js/Python, apply secure-by-default principles, test and deploy via CI/CD, collaborate with platform and engineering stakeholders, and deliver reliable, maintainable infrastructure changes.

Own day-to-day ad campaign trafficking, QA, monitoring and optimisation in Google Ad Manager. Troubleshoot delivery and tracking issues, produce performance reporting, and use AI and automation to improve processes and scale operations while partnering with Account Management, Ad Sales, Product, Engineering and Data.

Lead design for Trainline's New Business expansion into hotels, car hire, insurance and advertising. Build and hire a UX team, run rapid prototyping and experimentation, embed AI in design practice, define research roadmaps, and ensure new verticals integrate coherently with the core Trainline product.

Design, build and operate backend services in C#/.NET; own full development lifecycle, mentor teammates, improve reliability, observability, CI/CD, and scale microservices across AWS.

Manage monthly reporting, analysis and commentary for assigned areas; support month-end journals, reconciliations and balance sheet control; partner with stakeholders on budgeting, forecasting and commercial accounting; assess contract accounting treatments; drive process improvements and automation across Finance.

Design, implement and improve Trainline's infrastructure platform using Terraform and AWS. Build automation and tooling in Node.js or Python, enforce secure-by-default cloud patterns, test and deploy via CI/CD, mentor mid-level engineers, collaborate across teams, and manage multi-account, multi-region, and enterprise-scale platform concerns to deliver reliable, scalable infrastructure.