Senior Full-Stack Engineer – New York – On-Site – Opportunity to join one of the Fastest-Growing and Well-Known Fin-Tech Start-Ups in NYC

Senior Full-Stack Engineer – New York – On-Site – Opportunity to join one of the Fastest-Growing and Well-Known Fin-Tech Start-Ups in NYC

This young and agile company, building a cutting-edge commerce network is currently seeking a talented Senior Full-Stack Engineer to work on high-impact projects.

You will assist with the continuous expansion and optimization of their services in a frontier space.

This is an excellent opportunity for an experienced Full-Stack Engineer to take the next step into a challenging position with a company offering significant growth potential.

About the Company:

• Valued at over $10bn having raised over $250m in their Series B funding in 2025.
• Launched in the 2020’s, this is phenomenal growth
• Their network has already reached more than 4.5 million people
• They have already acquired some smaller Fintechs
• They launched their new product in 2026

About the Senior Full Stack Engineer Vacancy:

In this position, you will:

• Work across the full lifecycle of projects - from scoping and technical roadmapping to production and deployment

• Have your say in technical conversations, code reviews, and architectural decision-making

• Adapt to the demands of various projects and issues by working across the stack as needed

• Use Node.js frameworks (NestJS, Hono, Express) to create and manage backend services.

• Use Next.js, React, and React Native to create efficient front-end experiences.

• Work together with design teams to utilise our design system on mobile and web platforms.

• Create schemas, optimise queries, and guarantee data integrity using relational databases (PostgreSQL).

• Put into effect and uphold observability techniques, such as distributed tracing, structured logging, and monitoring

Ideal Requirements for the Senior Full Stack Engineer Vacancy:

• Several years of professional software development experience

• Strong proficiency in React, TypeScript, and modern JavaScript

• Hands-on experience with Node.js backend development using frameworks like NestJS, Express, or Hono

• Experience with Next.js and/or React Native for building production applications

• Solid understanding of relational databases (PostgreSQL preferred), including data modeling and query optimization

• Familiarity with state management patterns and libraries (Redux or similar)

• Experience working with design systems and component libraries

• Understanding of observability fundamentals: logging, tracing, metrics, and alerting

• Experience designing systems that scale—caching strategies, async processing, API design

• Proficiency with Git and modern CI/CD workflows

• Strong problem-solving skills and attention to detail

• Solid understanding of RESTful APIs and web services

• Excellent communication and collaboration abilities