Senior Full-Stack Engineer at Leading Organization (New York, NY / On-Site)

Overview: 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

Company: Leading Organization

Location: New York, NY

Work Mode: On-Site

Employment Type: Full-Time

Salary: $180,000 - $200,000/yr

Apply Now

Role Overview

Join one of New York City's fastest-growing and most well-known FinTech start-ups, a young and agile company building a cutting-edge commerce network. Valued at over $10 billion, having raised over $250 million in Series B funding in 2025, this organization has demonstrated phenomenal growth since its launch in the 2020s. Their network has already reached more than 4.5 million people, and they've successfully acquired several smaller FinTechs, launching a new product in 2026.

We are seeking a talented Senior Full-Stack Engineer to contribute to high-impact projects and assist with the continuous expansion and optimization of our services in a frontier space. This is an exceptional opportunity for an experienced engineer to advance their career into a challenging position with a company offering significant growth potential and the chance to shape the future of commerce.

Key Responsibilities & Duties

• Work across the full lifecycle of projects, from scoping and technical roadmapping to production and deployment.
• Actively participate 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.
• Utilize Node.js frameworks (Nest JS, Hono, Express) to create and manage robust backend services.
• Develop efficient front-end experiences using Next.js, React, and React Native.
• Collaborate with design teams to implement our design system on both mobile and web platforms.
• Create schemas, optimize queries, and ensure data integrity using relational databases (PostgreSQL).
• Implement and uphold observability techniques, including distributed tracing, structured logging, and monitoring.

Requirements & Qualifications

• 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 Nest JS, 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—including caching strategies, async processing, and 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.

Benefits, Perks & Culture

• Opportunity to join one of NYC's fastest-growing and well-known FinTech start-ups.
• Significant growth potential within a rapidly expanding company.
• Engage in challenging, high-impact projects that shape the future of a cutting-edge commerce network.
• Collaborative and agile work environment.
• Competitive annual salary ranging from $180,000 to $200,000.
• On-site work in New York, NY, fostering strong team cohesion and direct collaboration.

How to Apply

Roles like this are highly sought after and filled quickly. Don't miss out on this incredible opportunity!

Apply Directly Here!

Alternatively, you can email your CV to richard@weareorbis.com.