Lead Software Engineer – Full Stack | Node.js, TypeScript, React | B2B SaaS

📍 Remote – India

💰 ₹25–50 LPA total CTC, depending on experience and scope

🕒 Full-time

**Node.js TypeScript React Full Stack Engineering Multi-Tenant SaaS Enterprise SaaS Technical Leadership**

Own a major product area. Lead the engineering. Stay deeply involved in the code.

Script Assist is looking for a hands-on Lead Software Engineer with deep production experience in Node.js, TypeScript and React to take technical ownership of a substantial part of our platform.

We are particularly interested in engineers who have built and evolved large, complex, multi-tenant B2B SaaS products with:

• Multiple interconnected product modules
• Customer-specific configurations
• Complex workflows and state transitions
• Roles and permissions
• Large integration surfaces
• APIs and webhooks
• Significant production data
• Different customer behaviours and requirements
• Years of accumulated product complexity

This is not simply a senior developer position.

We need someone who can own an area technically , make important engineering decisions, maintain very high standards across the code written by others, mentor engineers and remain capable of personally solving the hardest technical problems.

You may currently be a:

• Lead Software Engineer
• Lead Full Stack Engineer
• Technical Lead
• Tech Lead
• Senior Software Engineer
• Senior Full Stack Engineer
• Hands-on Staff Engineer
• Full Stack Technical Lead

Your current title matters less than the level at which you already operate.

About Script Assist

Script Assist is a UK healthcare technology company providing the software and operating infrastructure behind complex private clinical and pharmacy services.

Our platform connects:

• Clinics
• Pharmacies
• Prescribers
• Patients
• Operational teams
• External technology providers

and supports tens of thousands of structured clinical and pharmacy transactions every month.

The platform includes complex functionality across:

• Clinical workflows
• Prescribing
• Medication management
• Pharmacy operations
• Inventory
• Dispensing
• Payments
• Subscriptions
• Fulfilment
• Communications
• Reporting
• Permissions
• Integrations
• Customer-specific configuration
• Operational automation

Healthcare experience is not required .

What matters is that you have already built sophisticated software products where many features, workflows, integrations and customer configurations interact with each other.

The engineering problem

Script Assist is not a simple CRUD application.

Different customers may use the same underlying platform in different ways.

A new feature can interact with:

• Existing workflows
• Different user roles
• Tenant-specific configuration
• External integrations
• Payment states
• Operational processes
• Existing customer data
• Historical product decisions

We need engineers who understand how to extend a mature shared product without creating an unmaintainable collection of exceptions.

You should be comfortable thinking about questions such as:

• How should customer-specific behaviour be represented?
• Should this be configuration or code?
• How should workflows be versioned?
• What happens to processes already in progress?
• How do we prevent duplicate actions when events retry?
• How do we maintain data integrity across several systems?
• How do we change one module without breaking another?
• How do we make increasingly complicated software easier—not harder—to maintain?

🔧 What you will ownTechnical ownership

You will take responsibility for a substantial product domain.

That will include:

• Technical design
• Backend services
• Data models
• React applications
• APIs
• Integrations
• Testing strategy
• Deployment
• Production behaviour
• Technical debt
• Reliability

You should become the person who can say:

“I understand this area end-to-end and I am responsible for its technical quality.” Hands-on engineering

You will remain deeply involved in implementation.

You will:

• Write production Node.js / TypeScript backend code
• Build and review React / TypeScript applications
• Design APIs and service contracts
• Work directly with databases
• Debug difficult production behaviour
• Refactor problematic areas
• Implement technically difficult functionality
• Review and improve existing architecture

This is not an architecture-only role.

Technical leadership

You will:

• Lead design discussions
• Break large engineering proble…