Senior Back End Engineer

Summary

Join Arena, a fast-growing Silicon Valley AI startup, as a Senior Backend Engineer and make a significant impact on our app and API service. You will collaborate with experienced engineers to build and optimize AI-powered features, ensuring high performance, scalability, and availability for millions of users. The role involves working with cutting-edge technologies and tackling challenging real-time messaging and AI agent development. Arena offers a competitive salary and benefits package, including paid time off, a learning and development budget, and a supportive work environment.

Requirements

• 6+ years as a backend developer
• Experience with high-traffic and high-performance applications
• Experience with TypeScript
• Experience with Node.js
• Experience with TDD, BDD, or ATDD
• Experience with REST APIs
• Experience with MongoDB, AWS DocumentDB, or other document database
• Curious developer who experiments with AI and AI agents everyday

Responsibilities

• Make our app and API service faster, more scalable, and more flexible
• Collaborate with product and engineering teams to ship AI-powered features and make the existing ones perform orders of magnitude faster
• Design and build AI Agents, RAG pipelines, model fine-tuning and crawling
• Build a real-time chat that can scale to 1M simultaneous users
• Design, optimize and scale AI agent-based architectures, RAG pipelines, and other LLM-driven systems
• Integrate systems with data sources and handle millions of first-party data
• Build complex business rules orchestrations similar to Reddit, Discord, and Whatsapp

Preferred Qualifications

• Experience with statically typed languages (e.g. Java, C#, Go)
• Object-oriented and functional programming
• Experience with Golang
• Experience with AWS
• Experience with SQL
• Experience with React

Benefits

• Competitive salary package & benefits
• 4 weeks of paid time-off
• Learning and Development budget