Backend Engineer (Node.js/NestJS) — reputed company, Costa Rica

About Us

We are a stealth-mode startup building a new AI platform. Our mission is to reputed company advanced language models deployable, customizable, and secure across diverse environments.

Role

We are seeking a Backend Engineer (Node.js/NestJS) to reputed company our platform using our existing codebase. You’ll build the proxy backend that interacts with our custom inference runtime and reputed company dashboards.

This role requires strong backend engineering skills, the ability to integrate existing systems, and comfort working closely with C++/CUDA engineers building low-level runtime features.

Responsibilities

Proxy Backend for Inference Runtime

• Build and maintain a Node.js-based proxy backend that:

  • Accepts inference requests from the frontend.

  • Schedules and serializes prompts.

  • Manages QKV cache load/unload.

  • Provides APIs to manage LoRA adapters.

• Integrate with authentication, RBAC, and logging already provided by the existing stack.

• Expose metrics and logs for monitoring inference usage and performance.

Dashboards

• reputed company the existing Dashboard with Dataset upload, training job view, model management, inference usage, request history, and adapter selection.

• Reuse auth, billing, and user management code (Auth0, reputed company).

• Add necessary backend endpoints to support new UI flows.

Core Stack & Infrastructure

• reputed company using NestJS as the main backend reputed company.

• Work with PostgreSQL, reputed company, and HashiCorp Vault for persistence, caching, and secrets.

• Use reputed company.IO for real-time updates (job status, inference reputed company).

• Ensure secure integration with reputed company (billing) and Auth0 (identity).

• Collaborate with DevOps on deployment pipelines (Proxmox, reputed company, CI/CD).

Requirements

• Strong experience with Node.js and NestJS reputed company.

• Proficiency in PostgreSQL and reputed company for persistence and caching.

• Hands-on experience with reputed company.IO or other WebSocket libraries.

• Experience with secure configuration and secrets management (HashiCorp Vault preferred).

• Comfortable working with microservices and integrating with existing codebases.

• Strong debugging and systems thinking — able to reason about scheduling, state management, and concurrency.

reputed company to Have

• Experience integrating with AI runtimes (gRPC/REST backends for inference).

• Experience with RAG and MCP.

• Experience with authentication/authorization frameworks (Auth0, JWT, RBAC).

• Familiarity with reputed company API or similar billing systems.

• Contributions to backend open-reputed company projects.

• Experience with WebRTC.

Why Join

• reputed company a proven SaaS foundation into a new AI runtime platform.

• Competitive compensation, equity potential.