Principal Full Stack Developer, New York

ION Group; New York (NY); On-site; USD 180,000 - 230,000; Full time

Benefits offered by this job

Discretionary bonus

401(k)

Medical, dental, vision coverage

Paid holidays

Job summary

Lab49, an established Lab49/ION entity in New York, seeks a Principal Full‑Stack Developer to lead a key project for a strategic client. You will work in a cross‑functional team, timelines, and client interactions to deliver modern digital products.

The role requires 10+ years in Python or C#, 5+ years in React, and extensive AWS experience with Terraform and Docker. A BS in CS and experience with large financial firms are preferred.

Qualifications

• 10+ years hands-on Python or C# development.
• 5+ years React and modern front-end state management.
• Experience architecting solutions on AWS with Terraform and Docker.
• Experience delivering for large financial institutions (e.g., Tier-1 banks).

Responsibilities

• Lead design and build of a structured products trading UI using modern web technologies.
• Design, document, and plan technical implementation for production delivery.
• Act as hands-on engineer and architect to support ongoing project work and guide teams.
• Maintain client relationships and expand footprint with strategic partnerships.

Skills

Python

C#

React

Education

BS in Computer Science

Tools

AWS

Terraform

Docker

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 Full‑Stack Developer will play a critical leadership role on a key project for a strategic Lab49 client. Working in a collaborative cross‑functional project team, with direct client‑facing interactions, you will have an opportunity to lead a team of engineers and build modern digital products.

What you’ll be doing:

• Partnering with our client to lead the design and build of a structured products trading UI using modern web development technology and techniques. You will be responsible for managing engineering deliverables, and the relationships with other key contributors to deliver great software.
• Design, document, and plan for the technical implementation and delivery of working software into production.
• Act as a hands‑on engineer and architect to support ongoing project work. Lead and actively participate in projects, serving as a role model for project teams and collaborating with other practices to ensure successful outcomes.
• Partner with client counterparts and stakeholders to maintain and build relationships, maintaining a commercial approach. Develop strong relationships with clients as a strategic partner and technical advisor, contributing to expanding our footprint and securing follow‑on work.

What you should have:

• 10+ years of solid hands‑on experience with Python or C# development.
• 5+ years of experience with React and modern front‑end state management.
• Extensive experience architecting solutions on AWS, including Terraform and Docker.
• Proven track record operating effectively inside large, complex organizations (e.g., Tier‑1 Investment Banks or Global Asset Managers).
• Deep understanding of SQL and data persistence strategies at scale.
• BS in Computer Science or equivalent experience.
• Expert‑level knowledge of, and strong demonstrated interest in, global financial markets and financial products.

Why Lab49?

Lab49 is an established partner for most financial institutions on Wall Street. You will gain exposure to a variety of environments, business domains, technologies, and people. Your ability to bring drive and creativity to the role will be the key component to success at Lab49. The broad and intense exposure to a variety of challenges accelerates your career growth, and Lab49’s structure is designed to enable you to learn and grow as an engineer and consultant.

The base salary range is:

• Mid to Senior level - $180,000 - $230,000

Base salary is only one component of our total compensation package. Employees may be eligible for a discretionary bonus, which is determined upon company and individual performance.

Salary range disclosure as required by S9427A when hiring in New York.

Our total rewards program is designed to support employee well‑being and professional growth. We offer a competitive benefits package including a discretionary bonus, paid holidays, a 401(k), and comprehensive medical, dental, and vision coverage. Additional benefits include life insurance, short and long‑term disability, Commuter FSA, Family Building Benefits, and more. All benefits are subject to eligibility requirements.

Lab49/ION is committed to maintaining a supportive and inclusive environment for people with diverse backgrounds and experiences. We respect the varied identities, abilities, cultures, and traditions of the individuals who comprise our organization and recognize the value that different backgrounds and points of view bring to our business.

Lab49/ION adheres to an equal employment opportunity policy that prohibits discriminatory practices or harassment against applicants or employees based on any legally impermissible factor.