Senior Backend Engineer (Node.js / TypeScript) – The AI Multiplier

We’re looking for a heavyweight Senior Backend Engineer with 5+ years of experience in Node.js and TypeScript. This is a role for a "full-time ready" engineer who has seen complex systems evolve and knows how to keep them reliable while scaling. We don't want a "prompt user." We want an architect who builds AI-driven colleagues to handle the heavy lifting. The Engineering Challenge Our platform processes massive volumes of product and order data across marketplaces (Amazon, Alza, Kaufland). It’s a 10-year-old evolving system where performance tuning directly impacts business outcomes. High Request Volume: Handling strict throttling limits and balancing sync pipelines. Smart Prioritization: Intelligently deciding what must be instant vs. what can be batched. Legacy Excellence: Improving reliability and throughput without rewriting everything from scratch. What You’ll Actually Be Working With (The Tech Stack) Core: Node.js (NestJS), TypeScript, MongoDB, PostgreSQL, Prisma. Communication: REST, gRPC, Custom high-volume queue system. Infrastructure: AWS, Docker. The "Plus" Tools: Temporal.io, Go, Valkey. The AI Force Multiplier Mindset We expect you to be exceptionally good at backend engineering, but also to use the best tools available to do it 10x better. Build, Don't Just Use: You’re the person who says: "Let’s build an AI agent to monitor our BI system and automatically propose optimizations." Accelerate Everything: Use AI to analyze complex legacy flows, speed up refactoring, and automate deep debugging. Multiply the Team: You aim to be so efficient that your presence multiplies the output of the entire engineering team. What We Need From You Deep Seniority: You can navigate large codebases and take ownership of technical quality. Database Mastery: Solid knowledge of MongoDB and PostgreSQL is a must. DevOps Comfort: You’re at home touching infrastructure when needed. Practical AI Openness: You have a proven workflow for AI-assisted analysis, architecture reasoning