Senior Full-Stack Software Engineer

About this role

Harness serves as the missing link between how we spend and what we believe in. Our financial technology platform connects consumers with nonprofits, financial institutions, and brands, helping consumers’ everyday spending to be a true representation of who they are—an ongoing vote for the world they want to live in.

Want to be part of our mission?

### About the Role

We’re looking for a Full-Stack Software Engineer (Remote, U.S.) to help power the next generation of Harness products. You’ll work across our TypeScript stack—building everything from beautifully responsive UIs in React to scalable, secure backend systems using NestJS, Postgres, AWS, and Terraform.

You’ll collaborate closely with engineers, designers, and product managers to deliver polished, high-performing features that connect consumers, nonprofits, and financial institutions through our platform.

This is a great opportunity for someone who’s excited about delivering across the stack, owning systems end-to-end, and building products that are elegant, resilient, and impactful.

### What you’ll do

• Design and build full-stack features from UI to API to database using React, NextJS, NestJS, and Postgres
• Collaborate cross-functionally with product and design, to solve real customer problems and ship elegant solutions
• Maintain and scale infrastructure using Terraform and AWS to ensure uptime, security, and performance
• Build reliable and performant APIs using REST and gRPC to support seamless interactions across our ecosystem
• Write high-quality, tested code and participate in code reviews and team ceremonies
• Contribute to architectural decisions and help improve developer velocity, system resilience, and scalability

### Qualifications

Required:

• 3+ years of experience building and maintaining web applications at scale
• Proficiency with **React**, **NextJS**, and **TypeScript** for frontend development
• Experience working with **Node.js frameworks** (preferably...