Senior Backend Developer (Core Systems)

About Us

Arpeely is a Data-Science startup combining real-time systems engineering, machine learning, and algorithmic optimization to gain a market edge and uncover hidden values in real-time advertising. Processing over 2 million bid requests per second - each with a sub-10ms decision window, we build and operate Machine Learning algorithms running on the world’s largest Real-time-bidding (RTB) Ad-Exchanges.

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, scale, and operate high-throughput, low-latency services to support high scale of ingestion, augmentation, continuous ML training, and real-time prediction.
• Design, implement, deploy and own end-to-end Cloud clusters, services, and infrastructure to support extreme workloads and traffic flow while maintaining a lean design and low-maintenance architecture.
• As all our systems are data-driven you will have an analytical aspect in measuring your modules both business and performance-wise
• Build internal simulation tools and validation endpoints that let the team test changes against live traffic before they ship
• Work side by side with data scientists and researchers - designing, implementing, and owning entire areas of the system from prototype to production
• Technological superiority is what gives us our edge so you’ll work and be up to date with the latest tech and trends

Requirements

• 5+ years Backend Development in Go or Python
• Experience with containerized (Docker, Kubernetes) deployments
• Experience with relational and NoSQL databases\ data warehouses or equivalent
• Team-player as well as the ability to be independent and proactive
• Bs.c Degree in Computer Science or Equiv. military experience
• Experience with AI models (LLMs, model integration, agent tooling) - Bonus
• Basic Knowledge of React \ TypeScript and web-technologies - Bonus
• Experience with Google Cloud Platform, GKE, BigQuery - Bonus