[Hiring] Back end Engineer @Arena.im

Role Description

Our team is made up of very experienced engineers, some with more than 10 years of experience. You will have an enormous impact on making our app and API service faster, more scalable and more flexible. You will collaborate with product and engineering teams to ship AI-powered features and make the existing ones perform orders of magnitude faster.

The challenges:

• Real-time messaging to support 500,000 concurrent users per customer application;
• High performance: our API responses are in the 10ms range;
• Design and build AI Agents, RAG pipelines, model fine-tuning and crawling;
• High scalability: we use sharding, master-master, and master-slave to ensure scalability;
• High availability: our code is running on homepages of the most visited websites and apps on the internet;
• Distributed databases for our Data Platform storing every user engagement.

Our Stack:

• Node.js, TypeScript;
• Golang;
• Websocket;
• Apollo GraphQL;
• AWS Lambda/Serverless framework;
• AWS (API Gateway, S3, VPC, IAM, Fargate, EC2, ALB, CloudFront, Kinesis, SQS, CloudWatch);
• Google Firestore/Firebase;
• MongoDB, PostgreSQL, DynamoDB;
• Redis;
• Cloudflare;
• Unit test.

Qualifications

• 3+ years as a backend developer;
• Experience with high-traffic and high-performance applications;
• Curious developer who experiments with AI and AI agents every day.

Requirements

• TypeScript;
• Node.js;
• TDD, BDD, or ATDD;
• REST APIs;
• MongoDB, AWS DocumentDB, or other document database;

Nice-to-Have Experience

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

Example Projects You’ll Be Working on

• 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.

Benefits

• 🔥 Be a part of the team in Silicon Valley and join a global team;
• 💪 A team of exceptional engineers leading the cutting-edge AI Agents;
• 💶 Competitive salary package & benefits;
• ⛱️ 4 weeks of paid time-off;
• 📖 Learning and Development budget;
• 🚀 Key moment to join Arena in terms of growth and opportunities;
• 💻 Ability to put your stamp on real-world AI applications that serve millions of users;
• 📚 Fast-learning environment, entrepreneurial and strong team spirit;
• 🌍 Multiple nationalities: cosmopolite & multi-cultural mindset;
• 💆‍♀️ Our people matter, work-life balance is important at Arena.