Principal Software Engineer

Pubgenius Inc. is a React.js and Next.js development agency and ad-tech startup, specializing in decentralized finance, fintech, and healthcare. They are seeking a Principal Software Engineer to take technical ownership of their high-revenue web platform and mobile app, focusing on architecture design and performance optimization.

Responsibilities:

• End-to-end technical ownership of a high-revenue web platform and mobile app
• Architecture design and long-term technical strategy
• Server-side rendering pipeline using Node.js, Fastify 5, and React 19
• Data layer across MySQL and BigQuery
• GCP infrastructure including Cloud Run, Cloud Build, and Global Load Balancer
• Ad-tech integrations including Google Ad Manager, GTM, GTag, and GPT.js
• Performance optimization at scale, where every millisecond counts
• ML pipeline maintenance and optimization for ad-tech performance

Requirements:

• Node.js with TypeScript in production
• React in a server-side rendering context
• MySQL including database design, query optimization, and ORM usage
• BigQuery for querying and managing large-scale datasets
• GCP with hands-on experience in Cloud Run, Cloud Build, Cloud SQL, and Load Balancing. GCP certification is a significant bonus
• Ad-tech industry experience including ad serving, yield optimization, and programmatic advertising
• Affiliate marketing experience, particularly with Anura and Everflow
• Cloudflare including CDN configuration, caching strategies, and Workers
• Fastify, especially Fastify 5 patterns
• Flutter for mobile app contribution
• Golang or Rust for high-performance service work
• Machine learning applied to ad-tech optimization (not LLMs or agents)
• Experience in DeFi, crypto, NFT, blockchain, fintech, or healthcare verticals