Backend Engineer (Node.js/NestJS) —Lisbon, Portugal

Baasi Inc.; Lisboa; Presencial; EUR 45 000 - 70 000; Tempo integral

Vantagens oferecidas por esta oferta de emprego

Competitive compensation

Equity potential

Resumo da oferta

A stealth-mode startup is looking for a Backend Engineer (Node.js/NestJS) to extend their AI platform in Lisbon. The role involves building a proxy backend, integrating with existing systems, and extending dashboards. Candidates should have strong backend engineering skills, experience with PostgreSQL and Redis, and familiarity with Socket.IO. The company offers competitive compensation and opportunities for equity potential. Join this innovative team to shape the future of AI technologies.

Qualificações

• Strong experience with Node.js and NestJS framework.
• Proficiency in PostgreSQL and Redis for persistence and caching.
• Hands-on experience with Socket.IO or other WebSocket libraries.
• Experience with secure configuration and secrets management.
• Comfortable working with microservices and integrating with existing codebases.
• Strong debugging and systems thinking abilities.
• Familiarity with LangChain for building AI-powered features.

Responsabilidades

• Build and maintain a Node.js-based proxy backend for inference requests.
• Integrate with authentication, RBAC, and logging from the existing stack.
• Expose metrics and logs for monitoring usage and performance.
• Extend the existing dashboard with new functionalities.
• Develop using NestJS for back-end framework.

Conhecimentos

Node.js

NestJS

PostgreSQL

Redis

Socket.IO

microservices

debugging

LangChain

Ferramentas

HashiCorp Vault

Docker

Proxmox

Descrição da oferta de emprego

Backend Engineer (Node.js/NestJS) —Lisbon, Portugal - full time

Ref # 3725669

About Us

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

Role

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

• Extend 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, Stripe).
• Add necessary backend endpoints to support new UI flows.

Core Stack & Infrastructure

• Develop using NestJS as the main backend framework.
• Work with PostgreSQL, Redis, and HashiCorp Vault for persistence, caching, and secrets.
• Use Socket.IO for real-time updates (job status, inference progress).
• Ensure secure integration with Stripe (billing) and Auth0 (identity).
• Collaborate with DevOps on deployment pipelines (Proxmox, Docker, CI/CD).

Requirements

• Strong experience with Node.js and NestJS framework.
• Proficiency in PostgreSQL and Redis for persistence and caching.
• Hands‑on experience with Socket.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.
• Familiarity with LangChain for building AI-powered features and workflows.

Nice 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 Stripe API or similar billing systems.
• Contributions to backend open‑source projects.
• Experience with WebRTC.

Why Join

• Extend a proven SaaS foundation into a new AI runtime platform.
• Competitive compensation, equity potential.

To Apply

Please send your CV along with your motivation to apply to work at Baasi. Make sure to specify the position you are currently applying for.

Apply now

We encourage individuals of all backgrounds to apply: We’re actively taking steps to make sure our culture is inclusive and that our processes and practices promote equity for all. We’d love to have the opportunity to consider you!