Backend Engineer
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Backend Engineer (Node.js/NestJS) —Porto, Portugal - full time
Ref # *
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
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