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Senior Staff Principal Back-end and Front-end Engineer

United States, New York · Job Posted March 04, 2026
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Job Description

Senior/Staff/Principal Back-End and Front-End Engineers – 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 Back End and Front-End Engineers of all levels with start-up experience. You will assist with the continuous expansion and optimization of their services in a frontier space. This is an excellent opportunity for an experienced Software Engineer with start-up experience to take the next step into a challenging position with a company offering significant growth potential.

Job Responsibility

  • Designing, deploying, and documenting the back-end services for the website and mobile app
  • Promote best practices, guarantee that integrations are technically feasible, and optimise the application for optimal speed, scalability, and dependability
  • Investigate and utilize Google Cloud Platform services to continuously improve application architecture
  • Implement microservices using Java and Quarkus framework
  • Propose and enhance automation initiatives related to infrastructure as code, CI/CD, monitoring and alerting
  • Contribute to all phases of the development lifecycle
  • Write well-designed, testable, and efficient code
  • Become a foundational member of our team, working alongside the Head of Engineering and Head of Product
  • Develop user-facing features
  • Work directly with the frontend engineering and product teams across the React Native mobile app
  • Identify opportunities to refactor and make features more robust
  • Coordinate with QA to test new features
  • Be responsible for writing unit and integration tests
  • Work together with the backend team to come up with requirements for an API

Requirements

  • Java
  • GCP and/or AWS or Azure, Distributed Systems focus
  • 6+ Years of Experience
  • Start-Up Experience
  • 6+ years of React experience
  • 3+ years of React Native experience
  • Proven experience in React Native, TypeScript/JavaScript, Redux/Global state management frameworks
  • Strong UX design skills, problem solving, and troubleshooting skills.
  • Understanding of how to optimize the delivery of code and assets to a browser or device
  • Ability to articulate the benefits and challenges of depending on front-end libraries, frameworks, and tool-sets
  • Ability to write testable code

Nice to have

Start-Up Experience

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