Senior Backend Developer

About Us

Arpeely has been working deep in the web’s infrastructure while partnering with Fortune 50 companies. Over the years, we've built large-scale AI and real-time systems that handle billions of interactions daily. That experience gave us a front-row view of how the web really works: how people use it, where performance breaks, and where privacy and clarity often get lost. Now we’re applying this knowledge to something new - a browser built from the ground up to make everyday online use simpler, more intuitive, and dare we say it - fun. This isn’t a side project or a concept; we've shipped a beta that's growing by the hour and built on a foundation we know inside out.

We’re reimagining the browser to make the web feel lighter, clearer, and more personal, with AI woven naturally into the experience to enhance everyday browsing. From search to multitasking, everything is designed to feel natural, helpful, and even a little fun. The goal is simple: remove friction, surface what matters, and help people get things done online without feeling overwhelmed. It’s a product built for real users, not tech demos, and we’re scaling fast with a small, focused team that cares about UX and performance.

What You’ll Do

We are looking for a passionate Backend Developer to join our small, high-caliber team. You will design, develop, and deploy the core systems behind our real-time bidding engine - a Go-based service that processes over 2 million requests per second, running a multi-step pipeline of campaign selection, ML prediction, and bid calculation, all within single-digit milliseconds. You'll also build and maintain the surrounding infrastructure: data pipelines, configuration systems, ML serving layers, and internal tools - working across Go and Python in a microservice environment.

This is an amazing opportunity to join a multi-disciplinary A-team while working in a fast-paced, data-oriented environment. If you are experienced but hungry to learn and have outsized impact - we’d love to have you on our team!

• Design & build backend services of a cutting-edge consumer-facing product, designed to compete at the highest level with the world’s leading tech companies.
• Work closely with data scientists and developers to understand the business from top-to-bottom and identify new modules that could turbocharge company processes
• Improve our user-facing modules and tackle diverse issues like solving worldwide caching and optimizing page performance
• Work on features that bring real-time data, analytics, and machine learning directly into the product, shaping how users interact with AI-driven functionality at scale.
• Technological superiority is what gives us our edge so you’ll work and be up to date with the latest tech and trends

• Proven experience as a Back-End Developer, demonstrating a track record of delivering high-quality products.
• Experience with AI models (LLMs, fine-tuning, model integration)
• 6+ years of experience in hands-on server-side (python preferred).
• Familiarity with Redis, BigQuery, MySQL (or equivalent SQL language).
• A team player as well as the ability to be independent and proactive.
• Great communicator: able to simplify a complex idea as well as collaborate effectively with others.
• Holds a strong sense of ownership and responsibility over their work and tasks.
• B.Sc. in Computer Science or equivalent military/bootcamp experience.