Backend Developer

2 days ago Be among the first 25 applicants

Location: Karachi, Pakistan (Onsite Office)

Company: Hubaix, D.H.A Phase II, Karachi

About Hubaix

Hubaix is a rapidly growing AI SaaS and automation company building enterprise-grade AI solutions, multi-agent automation platforms, and SaaS products for global clients. We specialize in delivering complex AI-powered systems that combine LLMs, AI agents, workflow automation, SaaS architecture, and real-world business integrations across industries like real estate, finance, logistics, healthcare, and hospitality.

We are expanding our technical core team and hiring full-time onsite Backend Developers for our Karachi office.

About the Role

We are seeking a skilled Backend Developer (Node.js) who will take ownership of building and maintaining highly scalable backend systems for our AI SaaS products, multi-agent automation platforms, and enterprise SaaS solutions.

You will work closely with frontend developers, AI engineers, product managers, and system architects to build secure APIs, real-time backend services, automation pipelines, and data integrations that power advanced SaaS platforms and intelligent agent-based systems.

This is a highly technical role inside a fast-paced AI SaaS environment that involves complex problem-solving, clean architecture design, and real-time SaaS product engineering.

Key Responsibilities

• Design and develop scalable RESTful and event-driven APIs using Node.js (Express.js / Nest.js).
• Build and maintain modular backend architectures for multiple SaaS platforms.
• Develop integrations with external APIs (CRMs, payment gateways, AI models, automation tools).
• Build real-time backend systems using WebSockets, event queues, and messaging brokers.
• Optimize API performance, database queries, and response time for large-scale multi-tenant SaaS systems.
• Work closely with AI engineers for backend integration of AI agents, LLM pipelines, and automation workflows.
• Design secure authentication and authorization systems (OAuth2, JWT, RBAC).
• Ensure backend code quality, modularity, testability, and documentation.
• Collaborate with full-stack teams to deliver fully integrated end-to-end SaaS products.

Required Qualifications

• Bachelor's degree in Computer Science, Software Engineering, or related discipline.
• Minimum 2 years of professional backend development experience with Node.js (Express.js or Nest.js).
• Strong hands-on experience with RESTful API design, JSON data exchange, and API integrations.
• Strong experience with relational databases (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis).
• Good understanding of scalable backend architecture and multi-tenant SaaS systems.
• Solid understanding of asynchronous processing, event-driven workflows, message queues (e.g. RabbitMQ, Redis Queue).
• Proficient in version control workflows (Git).
• Hands-on experience deploying backend services in production (Docker, Linux environments, cloud services).
• Strong problem-solving skills, debugging capability, and attention to backend system stability.
• Ability to write clean, modular, testable, and maintainable backend code.
• Must be willing to work full-time onsite from our Karachi office.

Preferred Skills (Bonus Points)

• Exposure to LLM AI models integration (OpenAI, Claude, OpenRouter, etc.).
• Experience working with AI agent orchestration (LangChain, CrewAI, Autogen).
• Experience with real-time streaming, WebSocket architecture, and live SaaS dashboards.
• Familiarity with SaaS billing systems, subscription management, and enterprise user management.
• Experience with Python backend development (FastAPI, Flask) is a plus.
• Exposure to serverless architecture (AWS Lambda, Google Cloud Functions).
• Familiarity with modern deployment pipelines (CI/CD).

Why Join Hubaix?

• Build real-world AI SaaS platforms used by enterprise clients internationally.
• Work closely on AI-powered agent systems, multi-agent orchestration, and complex SaaS platforms.
• Build backend architectures that integrate with AI, automation, and real-time data pipelines.
• Learn directly from experienced AI SaaS product builders, technical architects, and global client projects.
• Work on multiple real SaaS products across diverse industries — every system is unique.
• Full onsite mentorship, technical growth, and professional backend engineering exposure.

Benefits

• Competitive salary based on experience and skill level.
• Performance-based bonuses.
• Paid leaves and public holidays.
• Annual salary reviews, growth, and promotion opportunities.
• Full onsite collaboration, daily team interaction, and mentorship.
• Real SaaS platform engineering experience working with AI-integrated products.

How to Apply

If you're passionate about backend development, SaaS architectures, and API engineering — and want to work on real-world AI SaaS platforms — we'd love to hear from you.

Apply here or Send your CV to:

hr@hubaix.com

(Subject Line: Backend Developer – Full-Time Application – [Your Name])

Seniority level

• Seniority levelEntry level

Employment type

• Employment typeFull-time

Job function

• Job functionEngineering and Information Technology
• IndustriesIT Services and IT Consulting

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