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

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