Backend Java Developer - Freelance

Ai Kosmo - Your Hotel Digital Concierge; Bardi; Remoto; EUR 40.000 - 70.000; Tempo pieno

Descrizione del lavoro

An innovative hospitality tech startup is looking for a Backend Developer to join their team in transforming the hospitality sector through AI technology. The role is fully remote, requiring periodic in-person meetings in northern Italy. Responsibilities include designing backend services and APIs, developing integrations for AI agents, and ensuring the reliability and scalability of systems. The ideal candidate will have experience with Node.Js, TypeScript, and WebSockets. Opportunities for professional growth and hands-on work with modern technologies are offered.

Servizi

Flexible and modern remote work environment

Fast professional growth opportunities

Hands-on experience with cutting-edge technologies

High-impact role with direct influence on the product

Young, friendly, and motivated team

Competenze

• Experience with backend services and API development.
• Ability to design and maintain server infrastructure.
• Familiarity with real-time communication and integrations.

Mansioni

• Design, develop, and maintain backend services and APIs.
• Build integrations with external communication channels.
• Ensure scalability, reliability, and security of backend services.

Conoscenze

Node.Js

TypeScript

WebSockets

REST APIs

Postgres / Supabase

Integration Skills

Strumenti

Docker

Twilio / LiveKit

Descrizione del lavoro

Full-time contract with flexible hours

Fully remote (with recurring meeting / retreats in northern Italy)

We are a fast‑growing, innovative startup looking for a Backend Developer (all levels) to join our team and help us build AI agents. Your mission : maintain / expand our server infrastructure and create integrations that make our AI agent accessible as a voice assistant, through email and WhatsApp.

Responsibilities

• Design, develop, and maintain backend services and APIs
• Build integrations to connect the AI agent with external communication channels :
• Voice : integrate telephony via technologies such as LiveKit (calls, speech input / output)
• Messaging : integrate with WhatsApp and email systems
• Implement and optimize real‑time communication flows using WebSockets
• Ensure scalability, reliability, and security of backend services
• Collaborate with frontend and AI engineering teams to deliver seamless multi‑channel experiences

Core Tech Stack

• Node.Js
• Hono (or similar frameworks like Express.Js)
• WebSockets
• TypeScript
• Postgres / Supabase (schema design, query optimization, migrations)
• REST APIs
• Integration Skills (not mandatory;

you can learn on the job

• Twilio / LiveKit (voice, SMS, call routing, WhatsApp)
• Email integration (like SMTP)
• Experience designing robust webhook flows and handling external APIs

Bonus Skills

• Experience or strong interest in AI / Context Engineering (OpenAI APIs, RAG systems)
• Docker, CI / CD pipelines, cloud services
• Event‑driven architectures (RabbitMQ, etc.)

Soft Skills

• Flexible mentality and adaptable in a startup environment
• Strong problem‑solving and debugging skills
• Passion for what you do
• Self‑discipline for remote work, with openness to in‑person meetups

Location

Must be able to attend periodic (every 6–8 weeks) in‑person meetings in northern Italy

What We Offer

• Space for fast professional growth
• Flexible and modern remote work environment
• Hands‑on experience with cutting‑edge technologies
• High‑impact role : your work directly shapes our product
• Young, friendly, and motivated team

Ready to transform hospitality tech with us? Send us your CV!