Principal Full-Stack Developer, New York

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

Benefits offered by this job

Discretionary bonus

401(k) plan

Comprehensive medical/dental/vision

Job summary

Ion is seeking a senior software engineer/architect to lead the design and delivery of a structured products trading UI. You will guide technical implementation, collaborate with clients, and mentor teams on modern web technologies in a fast-paced financial services environment.

The role requires 10+ years in Python or C#, strong React experience, and deep AWS expertise. You will work with Tier-1 financial institutions and contribute to expanding long-term client partnerships.

Qualifications

• 10+ years 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.

Responsibilities

• Partner with client to lead the design and build of a structured products trading UI using modern web development technology and techniques.
• 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 and lead projects as a role model.
• Partner with client counterparts and stakeholders to maintain and build relationships, expanding the footprint and securing follow-on work.

Skills

Python

C#

React

AWS

Terraform

Docker

SQL

Financial markets

Education

BS in Computer Science

Tools

Terraform

Docker

Job description

Responsibilities

• Partner with client to lead the design and build of a structured products trading UI using modern web development technology and techniques. Responsible for managing engineering deliverables and relationships with key contributors (directly consulted).
• 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 the footprint and securing follow-on work.

Qualifications

• 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.

Salary and Benefits

The base salary range is:

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

Base salary is only one component of the total compensation package. Employees may be eligible for discretionary bonuses, which are 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.

EEO Statement

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.