At a Glance
- Tasks: Lead the development of innovative web and mobile applications in a fast-paced environment.
- Company: Join pubGENIUS, a cutting-edge ad-tech startup with a focus on decentralised finance and healthcare.
- Benefits: Enjoy competitive pay, flexible hours, and the freedom of remote work.
- Other info: Be part of a dynamic team with opportunities for growth and learning.
- Why this job: Make a real impact by optimising high-revenue platforms and working with advanced technologies.
- Qualifications: Proven experience in Node.js, React, MySQL, and GCP is essential.
The predicted salary is between 80000 - 100000 £ per year.
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
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
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.
Remote Principal Software Engineer in Southend-on-Sea employer: pubGENIUS
At pubGENIUS, we pride ourselves on being an innovative and dynamic development agency that fosters a culture of excellence and collaboration. As a remote employer, we offer flexible working hours, competitive rates, and the opportunity to work on cutting-edge projects in decentralized finance and ad-tech, ensuring that our employees are at the forefront of technology while enjoying a healthy work-life balance. We are committed to your professional growth, providing a platform for you to take ownership of significant technical decisions and contribute to high-revenue products that make a real impact across various industries.
StudySmarter Expert Advice🤫
We think this is how you could land Remote Principal Software Engineer in Southend-on-Sea
✨Tip Number 1
Network like a pro! Reach out to folks in the industry, join relevant online communities, and attend virtual meetups. You never know who might have the inside scoop on job openings or can refer you directly.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your best projects, especially those related to React.js, Node.js, and ad-tech. This will give potential employers a taste of what you can do and set you apart from the crowd.
✨Tip Number 3
Prepare for technical interviews by brushing up on your coding skills and system design principles. Practice common interview questions and scenarios that relate to performance optimisation and architecture decisions.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, it shows you’re serious about joining our team at pubGENIUS!
We think you need these skills to ace Remote Principal Software Engineer in Southend-on-Sea
Some tips for your application 🫡
Show Off Your Skills:Make sure to highlight your experience with Node.js, React, and GCP in your application. We want to see how you've tackled challenges in these areas, so don’t hold back on the details!
Tailor Your Application:Take a moment to customise your application for this role. Mention specific projects or experiences that align with our focus on performance and ad-tech. It’ll show us you’re genuinely interested!
Be Clear and Concise:When writing your application, keep it straightforward. We appreciate clarity, so avoid jargon and get straight to the point about your qualifications and what you can bring to the table.
Apply Through Our Website:Remember, we only review applications submitted through our website. So, make sure to follow the application link and submit your details there. We can’t wait to hear from you!
How to prepare for a job interview at pubGENIUS
✨Know Your Tech Inside Out
Make sure you’re well-versed in Node.js, React, and the other technologies mentioned in the job description. Brush up on your experience with server-side rendering and database optimisation, as these will be key discussion points during the interview.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific challenges you've faced in previous roles, especially those related to performance optimisation and technical strategy. Use the STAR method (Situation, Task, Action, Result) to structure your answers and demonstrate how you tackled complex issues.
✨Understand Their Business Model
Familiarise yourself with pubGENIUS’s focus on ad-tech and decentralised finance. Being able to speak knowledgeably about their industry and how your skills can contribute to their goals will set you apart from other candidates.
✨Ask Insightful Questions
Prepare thoughtful questions that show your interest in the role and the company. Inquire about their current tech stack, future projects, or how they measure success in their ad-tech optimisation. This not only shows your enthusiasm but also helps you gauge if the company is the right fit for you.
