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Senior/ Staff Backend Software Engineer Job Opening In Vapi – Now Hiring ExpiWell


Job description

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Our Experience Sampling Methodology (ESM) platform and mobile apps replace outdated survey methods, allowing organizations to capture dynamic and contextual data.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 https://www.Apollographql.Com/tutorials/lift-off-part1 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

- Design and document APIs using Swagger/OpenAPI specifications.

- Review and validate AI-generated code for quality, security, and best practices

- Implement AWS integrations (S3, SES) and third-party services (SendGrid, Stripe, Twilio)

Required Skills

Technical Stack

- Expert-level NestJS (v11+) with dependency injection, guards, interceptors, pipes

- Advanced TypeScript (v5.7+) with generics, decorators, and type safety patterns-

  • Apollo GraphQL basic 1-4 certificate training.

    Free training provided by Apollo Odyssey.

- MongoDB with Mongoose ODM and complex aggregations

- Testing: Jest, unit testing, E2E testing, test coverage strategies

- RESTful API design and versioning strategies

- WebSocket/Socket.IO for real-time features

- AWS Services: S3, SES, CloudWatch

- Git workflow with conventional commits and PR reviews

AI-Assisted Development

- Experience using AI coding assistants (Claude code VSCode CLI)

- Ability to write effective prompts for code generation

- Strong code review skills to validate AI-generated code

- Understanding of when to trust AI vs.

manual implementation

- Familiarity with AI-assisted testing and documentation

Nice to Have

- React / Next.Js experience

- Redis for caching and distributed locking

- Stripe payment integration

- Twilio SMS/voice integration

- Puppeteer/headless browser automation

- Sentry error monitoring

- Docker containerization

- Experience with research/survey platforms

What Makes You Great for This Role

- You can rapidly prototype features using AI assistance while maintaining code quality

- You understand modern backend architecture (microservices, event-driven, CQRS)

- You write clean, maintainable code that follows SOLID principles

- You're comfortable working with large codebases and legacy migration

- You proactively write tests and documentation

- You can debug complex issues across multiple services

- You stay current with JavaScript/TypeScript ecosystem trends

Project Context

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

The API handles:

- Survey delivery and response collection

- Real-time participant messaging

- Payment/incentive distribution

- Media upload and transcription

- Geofencing and sensor triggers

- Anonymous survey participation

Development Environment

- Framework: NestJS v11 monorepo with shared libraries

- Package Manager: pnpm

- Code Quality: ESLint v9, Prettier, TypeScript

- Testing: Jest v30 with coverage reporting

- AI Tools: Claude Code CLI for development assistance

- Deployment: AWS infrastructure

How to Apply

Submit your application with:

1.

Resume highlighting NestJS and TypeScript projects

2.

GitHub and LinkedIn profile

3.

Brief description of your experience with AI coding tools.

What We Offer:

* Fully remote, flexible work setup

* Supportive, collaborative global team

* Opportunities for long-term growth and increased responsibility

Required Skill Profession

Computer Occupations


  • Job Details

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The Work Culture

An organization's rules and standards set how people should be treated in the office and how different situations should be handled. The work culture at ExpiWell adheres to the cultural norms as outlined by Expertini.

The fundamental ethical values are:

1. Independence

2. Loyalty

3. Impartiapty

4. Integrity

5. Accountabipty

6. Respect for human rights

7. Obeying India laws and regulations

What Is the Average Salary Range for Senior/ Staff Backend Software Engineer Positions?

The average salary range for a varies, but the pay scale is rated "Standard" in Vapi. Salary levels may vary depending on your industry, experience, and skills. It's essential to research and negotiate effectively. We advise reading the full job specification before proceeding with the application to understand the salary package.

What Are the Key Qualifications for Senior/ Staff Backend Software Engineer?

Key qualifications for Senior/ Staff Backend Software Engineer typically include Computer Occupations and a list of qualifications and expertise as mentioned in the job specification. The generic skills are mostly outlined by the . Be sure to check the specific job listing for detailed requirements and qualifications.

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Interview Tips for Senior/ Staff Backend Software Engineer Job Success

ExpiWell interview tips for Senior/ Staff Backend Software Engineer

Here are some tips to help you prepare for and ace your Senior/ Staff Backend Software Engineer job interview:

Before the Interview:

Research: Learn about the ExpiWell's mission, values, products, and the specific job requirements and get further information about

Other Openings

Practice: Prepare answers to common interview questions and rehearse using the STAR method (Situation, Task, Action, Result) to showcase your skills and experiences.

Dress Professionally: Choose attire appropriate for the company culture.

Prepare Questions: Show your interest by having thoughtful questions for the interviewer.

Plan Your Commute: Allow ample time to arrive on time and avoid feeling rushed.

During the Interview:

Be Punctual: Arrive on time to demonstrate professionalism and respect.

Make a Great First Impression: Greet the interviewer with a handshake, smile, and eye contact.

Confidence and Enthusiasm: Project a positive attitude and show your genuine interest in the opportunity.

Answer Thoughtfully: Listen carefully, take a moment to formulate clear and concise responses. Highlight relevant skills and experiences using the STAR method.

Ask Prepared Questions: Demonstrate curiosity and engagement with the role and company.

Follow Up: Send a thank-you email to the interviewer within 24 hours.

Additional Tips:

Be Yourself: Let your personality shine through while maintaining professionalism.

Be Honest: Don't exaggerate your skills or experience.

Be Positive: Focus on your strengths and accomplishments.

Body Language: Maintain good posture, avoid fidgeting, and make eye contact.

Turn Off Phone: Avoid distractions during the interview.

Final Thought:

To prepare for your Senior/ Staff Backend Software Engineer interview at ExpiWell, research the company, understand the job requirements, and practice common interview questions.

Highlight your leadership skills, achievements, and strategic thinking abilities. Be prepared to discuss your experience with HR, including your approach to meeting targets as a team player. Additionally, review the ExpiWell's products or services and be prepared to discuss how you can contribute to their success.

By following these tips, you can increase your chances of making a positive impression and landing the job!

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