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.

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.

Engagement Details:

Type: Full-time independent contractor or EOR
Hours: Full-time commitment expected
Location: Remote
Clients: US and Europe
Rate: Competitive, based on experience

What You'll Own

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

Must-Have Qualifications

These are non-negotiable. Please only apply if you have strong, production-proven experience in all of the following:

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.

Nice-to-Have Experience

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

Benefits

Fully remote work
Flexible hours
Paid vacation and sick days

Application Process

We do not review applications via LinkedIn DMs or email. Please apply through the application link.
We do not work with staffing agencies or third-party recruiters. Direct applicants only.

pubGENIUS

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