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Senior Full Stack Engineer / Startup experience / React / Node

Motion Recruitment Partners, LLCPhiladelphia, PA🇺🇸United StatesPosted 21 Jul 2026

Why This Role Stands Out

This is an exciting opportunity to join an innovative fintech company, building foundational systems that impact authentication, data privacy, and AI enablement, offering significant career growth and skill development. You'll thrive here if you enjoy owning projects end-to-end and collaborating with cross-functional teams, with the flexibility of a hybrid or remote work arrangement. Apply now to contribute to a rapidly growing organization!

Quick Overview

Work Type
Hybrid
Level
Mid Senior

Job Description

Senior Full Stack Engineer

I'm working with an innovative fintech company that's hiring a Senior Full Stack Engineer to join their Core Engineering team. This team builds the foundational systems that power authentication, data privacy, AI enablement, and internal tooling across the organization.
  • Hybrid (1-2 days/week) if you're local to an office in Silver Spring, MD, New York City, San Francisco, Miami, or Denver
  • Remote candidates are welcome if you are not local to an office
Responsibilities
  • Build and maintain core services supporting authentication, data privacy, AI infrastructure, and internal tooling
  • Own projects from technical design through implementation, deployment, and ongoing support
  • Develop scalable backend services using Node.js, TypeScript, and relational databases
  • Build modern frontend applications with React (or similar frameworks)
  • Partner with Product, Data, and Operations teams to deliver reliable, scalable systems
  • Improve system reliability, observability, and performance across critical workflows
  • Design and enhance APIs, shared libraries, and platform tooling used across engineering
  • Participate in architecture discussions, code reviews, and technical documentation
Requirements
  • 7+ years of professional full stack software engineering experience
  • Strong experience with Node.js, TypeScript, React (or similar), and Postgres (or another relational database)
  • Experience building scalable, production-grade web applications and backend services
  • Comfortable owning projects end-to-end with minimal direction
  • Strong understanding of observability, reliability, and production debugging
  • Experience collaborating across cross-functional engineering teams
  • Experience using AI-assisted development tools such as Cursor, Claude Code, GitHub Copilot, or similar
  • Experience with GraphQL is a plus
Nice to Have
  • Authentication & Identity (OAuth, SSO, Auth0, session management)
  • Data Privacy & Trust Systems
  • AI Enablement / LLM infrastructure
  • Internal developer tooling and platform engineering experience
Additional Information
  • No sponsorship or visa transfers are available for this position.

Skills

Node.js
Spring
OAuth
SSO
GraphQL
LLM
React
TypeScript

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