Remote Principal Software Engineer

Salary: £70,000 - 110,000 per year

Requirements

• Strong production-proven experience with Node.js and TypeScript
• Experience with React in a server-side rendering context
• Experience with MySQL, including database design, query optimization, and ORM usage
• Experience with BigQuery for querying and managing large-scale datasets
• Hands-on experience with GCP, including Cloud Run, Cloud Build, Cloud SQL, and load balancing
• GCP certification is a significant bonus
• Experience in ad-tech, including ad serving, yield optimization, and programmatic advertising, is a plus
• Affiliate marketing experience, particularly with Anura and Everflow, is a plus
• Experience with Cloudflare, including CDN configuration, caching strategies, and Workers, is a plus
• Experience with Fastify 5 is a plus
• Flutter experience for mobile app contribution is a plus
• Experience with Golang or Rust for high-performance service work is a plus
• Experience applying machine learning to ad-tech optimization is a plus
• Experience in DeFi, crypto, NFT, blockchain, fintech, or healthcare is a plus

Responsibilities

• Own end-to-end technical leadership of our high-revenue web platform and mobile app
• Define architecture and long-term technical strategy
• Lead the server-side rendering pipeline using Node.js, Fastify 5, and React 19
• Own the data layer across MySQL and BigQuery
• Manage our GCP infrastructure, including Cloud Run, Cloud Build, and Global Load Balancer
• Oversee ad-tech integrations, including Google Ad Manager, GTM, GTag, and GPT.js
• Optimize performance at scale, where every millisecond counts
• Maintain and optimize our machine learning pipeline for ad-tech performance
• Work directly with stakeholders to set technical direction, remove bottlenecks, and ship production-grade code

Technologies

• BigQuery
• Blockchain
• Cloud
• Flutter
• GCP
• Golang
• Load Balancing
• Machine Learning
• Marketing
• Mobile
• MySQL
• React
• Rust
• SQL
• TypeScript
• Web
• NodeJS
• DMS
• JavaScript

More

We are pubGENIUS, a React.js and Next.js development agency and ad-tech startup building websites and apps for clients across the US and Europe, with a focus on DeFi, crypto, NFT, blockchain, fintech, and healthcare, plus occasional work in e-commerce and other verticals. We also operate our own high-revenue web product with a website, mobile app, and machine learning systems powering our ad-tech optimization engine, where performance is a core requirement. This is a full-time independent contractor engagement with a fully remote setup available in the US, Canada, the UK, Ireland, or the Netherlands. We offer flexible hours, paid vacation and sick days, and competitive compensation based on experience.

last updated 28 week of 2026