Remote Principal Software Engineer
hace 3 días
Oxford
pubGENIUS is a React.js and Next.js development agency and ad-tech startup. We build websites and apps for clients across the US and Europe, specializing in decentralized finance (DeFi, crypto, NFT, blockchain), fintech, and healthcare, with occasional work in e-commerce and other verticals. \n Beyond client work, we operate our own high-revenue web product with a website, mobile app, and machine learning systems powering our ad-tech optimization engine. Performance is not a preference here, it is a core requirement. \n \n We are looking for a Principal Software Engineer, who will be the technical authority, responsible for all development, architecture decisions, and long-term technical strategy across a website, mobile app, and ML-powered ad-tech optimization systems. \n This is a full-time independent contractor engagement. You will work hands-on at a senior level where site speed and server performance are core success metrics. You will work directly with stakeholders to set technical direction, remove bottlenecks, and ship production-grade code. \n \n Engagement Details: \n\n • Type: Full-time independent contractor\n, • Hours: Full-time commitment expected\n, • Location: Remote (US, Canada, UK, Ireland or Netherlands)\n, • Clients: US and Europe\n, • Rate: Competitive, based on experience\n\n \n What You'll Own \n\n • End-to-end technical ownership of a high-revenue web platform and mobile app\n, • Architecture design and long-term technical strategy\n, • Server-side rendering pipeline using Node.js, Fastify 5, and React 19\n, • Data layer across MySQL and BigQuery\n, • GCP infrastructure including Cloud Run, Cloud Build, and Global Load Balancer\n, • Ad-tech integrations including Google Ad Manager, GTM, GTag, and GPT.js\n, • Performance optimization at scale, where every millisecond counts\n, • ML pipeline maintenance and optimization for ad-tech performance\n\n Must-Have Qualifications \n These are non-negotiable. Please only apply if you have strong, production-proven experience in all of the following: \n\n • Node.js with TypeScript in production\n, • React in a server-side rendering context\n, • MySQL including database design, query optimization, and ORM usage\n, • BigQuery for querying and managing large-scale datasets\n, • GCP with hands-on experience in Cloud Run, Cloud Build, Cloud SQL, and Load Balancing. GCP certification is a significant bonus.\n\n \n Nice-to-Have Experience \n\n • Ad-tech industry experience including ad serving, yield optimization, and programmatic advertising\n, • Affiliate marketing experience, particularly with Anura and Everflow\n, • Cloudflare including CDN configuration, caching strategies, and Workers\n, • Fastify, especially Fastify 5 patterns\n, • Flutter for mobile app contribution\n, • Golang or Rust for high-performance service work\n, • Machine learning applied to ad-tech optimization (not LLMs or agents)\n, • Experience in DeFi, crypto, NFT, blockchain, fintech, or healthcare verticals\n\n\n, • Fully remote work\n, • Flexible hours\n, • Paid vacation and sick days\n\n \n Application Process \n\n • We do not review applications via LinkedIn DMs or email. Please apply through the application link.\n, • We do not work with staffing agencies or third-party recruiters. Direct applicants only.\n\n \n pubGENIUS is an Equal Opportunity Employer; employment with pubGENIUS is governed on the basis of merit, competence, and qualifications and will not be influenced in any manner by race, age, colour, gender, religion, national origin/ethnicity, veteran status, sexual orientation, marital status, gender identity, mental or physical disability, or any other legally protected status.