Principal React/.NET Developer, New York

ion design
New YorkPosted 21 February 2026

Tech Stack

Job Description

Lab49 is an award-winning specialist consultancy that creates bespoke technology in partnership with the most important companies in finance.   We were founded in 2002 to bring Silicon Valley solutions to Wall Street’s door. Since then, we have worked on successive waves of technological change, including distributed computing, high-speed automation, enterprise UX and digital distribution (for which Lab49 was among the first significant practices established on Wall Street), DevOps, cloud and data science.      Today, we are an established partner in financial markets, having delivered hundreds of projects for clients including all the world’s tier-one investment banks and many of the largest buy-side firms globally.       Being part of Lab49 means bringing your drive and creativity into an environment where your contributions will make immediate impact. Engineers will work in cross functional teams, consulting directly with our clients, shaping not only technical solutions to business problems but delivering them into production.   The Principal React/.NET Engineer will play a critical leadership role on a key project for a strategic Lab49 client.     You will work shoulder-to-shoulder with Product and UX experts from Lab49and our client. In addition to the Lab49 project team, you will collaborate with client product and engineering stakeholders to guide the discovery and build phase of an exciting new initiative.