Back End Engineer

🕒 May 22

🇧🇷 Brazil – Remote

⏰ Full Time

🟡 Mid-level

🟠 Senior

🔙 Backend Engineer

👻 Ghost score 65%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Arena

WebsiteLinkedInAll Job Openings

11 - 50 employees

☁️ SaaS

📱 Media

🛍️ eCommerce

SaaS • Media • eCommerce

Arena is a leading provider of digital engagement solutions designed to transform how organizations connect with audiences in real-time. The company offers an all-in-one platform featuring tools like Live Blog, Group Chat, and Commerce AI to facilitate interactive experiences. Arena caters to industries such as Publishers & Media, Sports & Entertainment, and eCommerce, enhancing audience engagement and driving sales through AI-powered applications. Arena's solutions allow organizations to build, monetize, and retain thriving communities by integrating seamlessly with websites and apps, ensuring strategic growth and optimized performance.

📋 Description

• Make Arena's app and API service faster, more scalable, and more flexible • Collaborate with product and engineering teams to ship AI-powered features • Improve the performance of existing features by orders of magnitude • Build real-time messaging supporting 500,000 concurrent users per customer application • Design and build AI Agents, RAG pipelines, model fine-tuning, and crawling • Work with sharding, master-master, and master-slave architectures • Build and maintain highly available code for heavily visited websites and apps • Work with distributed databases storing user engagement data • Build real-time chat scaling to 1M simultaneous users • Design, optimize, and scale AI agent-based architectures, RAG pipelines, and 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

🎯 Requirements

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

🏖️ Benefits

• Competitive salary package & benefits • 4 weeks of paid time-off • Learning and Development budget • Ability to put your stamp on real-world AI applications that serve millions of users • Work-life balance is important at Arena