Principal Software Engineer

pubGENIUSNew York, NY

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Overview

Schedule

Full-time

Education

Google (Analytics, Adwords, etc.)

Career level

Senior-level

Remote

Benefits

Paid Vacation

Paid Sick Leave

Job Description

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.

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.

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
Hours: Full-time commitment expected
Location: Remote (US, Canada, UK, Ireland or Netherlands)
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 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.

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FAQs About Principal Software Engineer Jobs at pubGENIUS

What is the work location for this position at pubGENIUS?

This job at pubGENIUS is located in New York, NY, according to the details provided by the employer. Some roles may also include multiple work locations depending on the requirement.

What pay range can candidates expect for this role at pubGENIUS?

Employer has not shared pay details for this role.

What employment applies to this position at pubGENIUS?

pubGENIUS lists this role as a Full-time position.

What experience level is required for this role at pubGENIUS?

pubGENIUS is looking for a candidate with "Senior-level" experience level.

Does pubGENIUS allow remote work for this role?

Yes, this position at pubGENIUS supports remote work, giving candidates the flexibility to work outside the primary office location.

What education level is required for this job?

The education requirement for this position is Google (Analytics, Adwords, etc.). Candidates with relevant qualifications or equivalent experience may also be considered.

What benefits are offered by pubGENIUS for this role?

pubGENIUS offers following benefits: Paid Vacation and Paid Sick Leave for this position. Actual benefits may vary depending on the employer's policies and employment terms.

What is the process to apply for this position at pubGENIUS?

You can apply for this role at pubGENIUS either through Sonara's automated application system, which helps you submit applications 10X faster with minimal effort, or by applying manually using the direct link on the job page.