Senior / Staff Backend Software Engineer

Senior Backend Developer (Nest.JS - AWS - Mongo - Apollo GraphQL)

Required skills : 
 Nest.JS, MongoDB, AWS, Apollo GraphQL.

Company Description

At ExpiWell, we are transforming how organizations gather real-time, in-the-moment insights about human experiences. Our Experience Sampling Methodology (ESM) platform and mobile apps replace outdated survey methods, allowing organizations to capture dynamic and contextual data. Trusted by leaders in HR, Product & CX, Healthcare, and Academia, ExpiWell enables the collection of engagement, emotion, and behavior information through geofencing-triggered surveys and multimedia data capture. We aim to enhance research and promote a greater understanding of the human condition.

Position Overview :

We're seeking an experienced Senior Backend developer to modernize and extend our ExpiWell research platform API using NestJS and Apollo GraphQL, AWS and MongoDB Atlas architecture. The main server will be serving a native IOS and and Android Application as well a modern unified React Native app that is currently in development.

Key Responsibilities :

• Migrate legacy API endpoints from Express to NestJS v11 with full TypeScript typing.
• Build RESTful APIs , WebSocket gateways, and background job systems.
-Improve out AWS infrastructure to a more modern VPS. AWS certification a huge plus.
- Redesign our MongoDB architecture to better align with global customers.
- Apollo GraphQL certificate training in Parts 1 to 4. (must complete)
• Implement authentication, payment processing, and real-time messaging features.
• Write comprehensive unit tests (Jest) and maintain >

80% code coverage

Required Skills

Technical Stack

AI-Assisted Development

Nice to Have

What Makes You Great for This Role

Project Context

You'll be working on a research platform that powers mobile experience sampling studies. The API handles :

Development Environment

How to Apply

Submit your application with :

1. Resume highlighting NestJS and TypeScript projects

2. GitHub and profile

3. Brief description of your experience with AI coding tools.

What We Offer :